JP5771090B2 - Power supply system - Google Patents

Description

  The present invention is a power supply system that supplies uninterruptible power, high reliability, and high efficiency DC power to a load such as a server installed in a data center or the like. The present invention relates to an operating power supply system.

Conventionally, a power supply device in a data center or the like is equipped with an uninterruptible power supply device in preparation for a power failure. In this system, a converter (commercial) AC (single phase or three phase) is converted to DC by a converter, and the secondary battery is float-charged by this DC, and this DC is converted back to AC by an inverter and AC is applied to the load. Electric power (effective voltage: 100V, 200V (single phase or three phase), etc.) is supplied.
However, in this system, power loss occurs due to the converter and the inverter, and the efficiency deteriorates.

Therefore, recently, a method for supplying DC power from a method for supplying AC power to a load has been studied from the viewpoint of efficient use of power and reduction of exhaust CO ₂ . This is an idea of improving power efficiency by directly supplying direct current without DC / AC conversion, since a device such as a server that operates as a load originally operates with direct current.

In Patent Document 1, an AC power source is converted into a DC power source by a converter, and a DC power source is supplied to a load while floating charging a battery with the DC power source. In the event of a power failure, power is supplied from the battery to the load.
In Patent Document 1, the inverter loss is eliminated by supplying the output of the converter directly to the load without going through the inverter. However, since the converter is always operated to supply power to the load, this converter power loss is also large.
This converter is not a simple rectifier circuit, but requires a control circuit to increase the stabilization accuracy of the output voltage, is expensive, and has a large power loss.
In Patent Document 1, since the battery is always floating-charged with the output voltage of the converter, converter voltage control for high-accuracy battery charge voltage management is necessary and more expensive from the viewpoint of battery life.

Paragraphs “0011” and “0012” of Patent Document 2 include the following description.
“The power management approach required in this field is to be able to centrally manage the power consumption of data centers / application systems, and to present a centralized power management design during application operation at the application development stage. To provide a power management interface for application development. "
“To solve the above-mentioned problem, the centralized power management method and system, the device-side agent, and the centralized power management controller of the present invention register the power management capabilities of a plurality of devices in a centralized manner and the operational status of the plurality of devices. By monitoring the system, it is possible to determine an appropriate power management policy for the plurality of devices in real time, and to save power by controlling the operation status of the plurality of devices by using the policy. Implement centralized power management of the multiple devices to achieve the goal. "

  In Patent Document 2, “saving power by controlling the operation status of a plurality of devices” is described, but the power efficiency on the power supply side that supplies power to the plurality of devices is not considered. That is, even if the efficiency on the load side (demand side) is good, it is necessary to improve the efficiency on the power source (supply side).

JP 2002-291171 A JP 2009-193577 A

In view of the above situation, the present invention realizes a power supply system that does not require a converter and an inverter as described above. Therefore, the power loss is extremely small and the price is very low. In addition, power is supplied to the load even without a power failure (without a switch for switching between commercial AC power and secondary battery power).

In addition, a configuration that does not require the equipment according to the maximum power demand required by the data center from the initial introduction is adopted, and a configuration in which the equipment can be added sequentially as the power demand increases.

  Furthermore, in a server used in a data center or the like, a system that supplies power suitable for a low-voltage, high-current DC input server is realized.

  This low-voltage, large-current DC input server transmits the supplied power as high-voltage direct current from the efficiency of power transmission, and the DC / DC converter immediately before the server converts it directly into a low-voltage, large current. A centralized power supply is realized to drive the DC / DC converter at an operating point with good voltage conversion efficiency.

  Furthermore, at the stage of transitioning the data center as a complete DC system, it is possible to realize power supply by using an efficient DC output centralized power supply by utilizing the assets of the conventional AC power supply system.

In order to achieve the above object, the present invention has the following configuration.
(1) A power supply system according to claim 1 is:
A plurality of DC voltage converters for inputting a first DC potential and outputting a second DC potential that is lower than the first DC potential;
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
In the plurality of DC voltage converters, optionally having output power and / or output current management means,
Any one unit of the DC voltage converters having the output power and / or output current management means is the second DC potential in the other DC voltage converters from other DC voltage converters other than itself. Provides output power and / or output current information by
The one arbitrary unit includes its own output power and / or output current information based on the second DC potential, output power and / or output current information based on the second DC potential in the other DC voltage converter, and Based on the total number of units of the plurality of DC voltage converters, the operation or non-operation of the plurality of DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, The integer part of the value obtained by dividing the total output power output by the DC voltage converter by the standard supply power per unit of the plurality of DC voltage converters is taken as the quotient, the remainder of the value is the remainder, and the remainder is a predetermined value. When the number is 1 or more, the remainder is 1, and when the remainder is less than the predetermined value 1, the remainder is 0. The value obtained by adding the quotient, the remainder, and the predetermined value 2 is the number of operations of the DC voltage converter. It is characterized by that.
(2) A power supply system according to claim 2 is:
A plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential, and a management device 1 having output power and / or output current management means, Prepared,
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
The management device 1 is provided with output power and / or output current information by the second DC potential from the plurality of DC voltage conversion devices,
Based on the output power and / or output current information and the total number of units of the plurality of DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of DC voltages. The operation or non-operation of the converter is determined, and the integer part of the value obtained by dividing the total output power output from the plurality of DC voltage converters by the standard supply power per unit of the plurality of DC voltage converters is taken as the quotient. The remainder of the value is the remainder, the remainder is 1 when the remainder is greater than or equal to the predetermined value 1, the remainder is 0 when the remainder is less than the predetermined value 1, and the quotient, the remainder and the predetermined value 2 are The added value is used as the number of operations of the DC voltage converter.
(3) A power supply system according to claim 3 is:
A plurality of DC voltage converters for inputting a first DC potential and outputting a second DC potential that is lower than the first DC potential;
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
In the plurality of DC voltage converters, optionally having output power and / or output current management means,
Any one unit of the DC voltage converters having the output power and / or output current management means is the second DC potential in the other DC voltage converters from other DC voltage converters other than itself. Provides output power and / or output current information by
The one arbitrary unit includes its own output power and / or output current information based on the second DC potential, output power and / or output current information based on the second DC potential in the other DC voltage converter, and Based on the total number of units of the plurality of DC voltage converters, the operation or non-operation of the plurality of DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, The integer part of the value obtained by dividing the total output current output by the DC voltage converter by the standard supply current per unit of the plurality of DC voltage converters is a quotient, the remainder of the value is the remainder, and the remainder is a predetermined value. When the number is 1 or more, the remainder is 1, and when the remainder is less than the predetermined value 1, the remainder is 0. The value obtained by adding the quotient, the remainder, and the predetermined value 2 is the number of operations of the DC voltage converter. It is characterized by that.
(4) A power supply system according to claim 4 is:
A plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential, and a management device 1 having output power and / or output current management means, Prepared,
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
The management device 1 is provided with output power and / or output current information by the second DC potential from the plurality of DC voltage conversion devices,
Based on the output power and / or output current information and the total number of units of the plurality of DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of DC voltages. The operation or non-operation of the converter is determined, and the integer part of the value obtained by dividing the total output current output from the plurality of DC voltage converters by the standard supply current per unit of the plurality of DC voltage converters is taken as the quotient. The remainder of the value is the remainder, the remainder is 1 when the remainder is greater than or equal to the predetermined value 1, the remainder is 0 when the remainder is less than the predetermined value 1, and the quotient, the remainder and the predetermined value 2 are The added value is used as the number of operations of the DC voltage converter.
(5) A power supply system according to claim 5 is:
A plurality of AC DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
In the plurality of AC to DC voltage converters, optionally having output power and / or output current management means,
Arbitrary one unit of the AC / DC voltage converters having the output power and / or output current management means is the DC power in the other AC / DC voltage converters from other AC / DC voltage converters other than itself. Provided output power and / or output current information by
The arbitrary unit includes the output power and / or output current information based on the direct current potential of itself, the output power and / or output current information based on the direct current potential in the other alternating current direct current voltage converter, and the plurality of alternating currents. Based on the total number of units of the DC voltage converter, the operation or non-operation of the plurality of AC DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, and the plurality of AC The integer part of the value obtained by dividing the total output power output by the DC voltage converter by the standard supply power per unit of the plurality of AC DC voltage converters is taken as the quotient, the remainder of the value is the remainder, and the remainder is predetermined. the該余when the value 1 or more and 1, 0 and該余when該余is less than the predetermined value 1, the operation speed of the AC-DC voltage converter a value obtained by adding the quotient and該余a predetermined value 2 It is characterized by.
(6) A power supply system according to claim 6 is:
A plurality of AC / DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential, and a management device 1 having output power and / or output current management means,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
The management device 1 receives output power and / or output current information based on the DC potential from the plurality of AC / DC voltage converters,
Based on the output power and / or output current information and the total number of units of the plurality of AC / DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of AC An integer of a value obtained by dividing the total output power output from the plurality of AC DC voltage converters by the standard supply power per unit of the plurality of AC DC voltage converters by determining the operation or non-operation of the DC voltage converter The quotient and the remainder of the value as the remainder, the remainder as 1 when the remainder is greater than or equal to the predetermined value 1, and the remainder as 0 when the remainder is less than the predetermined value 1, the quotient and the remainder a value obtained by adding a predetermined value 2, characterized in that the operating speed of the AC-DC voltage converter.
(7) A power supply system according to claim 7 is:
A plurality of AC DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
In the plurality of AC to DC voltage converters, optionally having output power and / or output current management means,
Arbitrary one unit of the AC / DC voltage converters having the output power and / or output current management means is the DC power in the other AC / DC voltage converters from other AC / DC voltage converters other than itself. Provided output power and / or output current information by
The arbitrary unit includes the output power and / or output current information based on the direct current potential of itself, the output power and / or output current information based on the direct current potential in the other alternating current direct current voltage converter, and the plurality of alternating currents. Based on the total number of units of the DC voltage converter, the operation or non-operation of the plurality of AC DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, and the plurality of AC The integer part of the value obtained by dividing the total output current output from the DC voltage converter by the standard supply current per unit of the plurality of AC DC voltage converters is taken as the quotient, the remainder of the value is the remainder, and the remainder is predetermined. the該余when the value 1 or more and 1, 0 and該余when該余is less than the predetermined value 1, the operation speed of the AC-DC voltage converter a value obtained by adding the quotient and該余a predetermined value 2 It is characterized by.
(8) A power supply system according to claim 8 is:
A plurality of AC / DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential, and a management device 1 having output power and / or output current management means,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
The management device 1 receives output power and / or output current information based on the DC potential from the plurality of AC / DC voltage converters,
Based on the output power and / or output current information and the total number of units of the plurality of AC / DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of AC determine the behavior or non-operation of the DC voltage converter, an integer of a value obtained by dividing the standard supply current per unit of the plurality of AC-DC voltage converter plurality of AC-DC voltage converter to the total output current that is output The quotient and the remainder of the value as the remainder, the remainder as 1 when the remainder is greater than or equal to the predetermined value 1, and the remainder as 0 when the remainder is less than the predetermined value 1, the quotient and the remainder a value obtained by adding a predetermined value 2, characterized in that the operating speed of the AC-DC voltage converter.

(A) The power supply system according to the present invention includes an output power and / or output current in a plurality of DC voltage converters by means of output power and / or output current management means of any one unit of the DC voltage converter or the management device. Based on the information and the total number of units of the plurality of DC voltage conversion devices, the operation or non-operation of the plurality of DC voltage conversion devices is determined, and the plurality of DC voltage conversion devices are operated at an operating point with good operating efficiency. The operating efficiency of the entire DC voltage converter is improved.
(B) The power supply system according to the present invention is a power supply system according to the present invention, in which an arbitrary unit of the AC / DC voltage converter or the output power and / or output current management means of the management device has a plurality of AC / DC voltages. Based on the output power and / or output current information in the converter and the total number of units of the plurality of AC / DC voltage converters, the operation or non-operation of the plurality of AC / DC voltage converters is determined, and a plurality of AC / DC voltage conversions are performed. The system is operated at an operating point where the operating efficiency of the apparatus is good, and the operating efficiency of the plurality of AC / DC voltage converters as a whole is increased.

These are the whole block diagrams which show 1st Embodiment of the power supply system by this invention. These are block diagrams which show a part of 1st Embodiment of the power supply system by this invention. These are block diagrams which show a part of 1st Embodiment of the power supply system by this invention. These are block diagrams which show a part of 1st Embodiment of the power supply system by this invention. These are block diagrams which show a part of 1st Embodiment of the power supply system by this invention. These are the whole block diagrams which show embodiment of the power supply system by a prior art. These are block diagrams which show a part of embodiment of the power supply system by a prior art. These are the whole block diagrams which show 2nd Embodiment of the power supply system by this invention. These are block diagrams which show a part of 2nd Embodiment of the power supply system by this invention.

(1) First Embodiment of Power Supply System (1-1) System Configuration FIG. 1 is a schematic hardware diagram showing the basic principle of the entire power supply system according to the first embodiment of the present invention. It is a system configuration diagram.
Note that incidental elements not related to the basic part of the present invention are omitted in FIG. 1, but will be described in terms of the specification.

(F-1)
Hereinafter, with reference to FIG. 1, the hardware system component which is 1st Embodiment of the power supply system of this invention is demonstrated.

In FIG. 1, symbol Cn1 represents a converter including a rectifier circuit that converts a three-phase alternating current into a pulsating direct current, and is referred to as a converter Cn1.
A code C and a code A are displayed on the converter Cn1. Symbol C represents a positive electrode potential output terminal, and symbol A represents a negative electrode potential output terminal. These output terminals are referred to as a positive electrode potential output terminal C and a negative electrode potential output terminal A, respectively.
Symbol Ba1 represents a parallel connection assembly of the secondary battery group 1 in which a plurality of secondary batteries are connected in series, and is referred to as a secondary battery assembly Ba1.
Reference sign P and reference sign N are displayed on the secondary battery assembly Ba1. Symbol P represents a positive electrode potential output terminal, and symbol N represents a negative electrode potential output terminal. These output terminals are referred to as a positive electrode potential output terminal P and a negative electrode potential output terminal N, respectively.
A symbol PU1 surrounded by a frame indicated by a symbol Rc is a concentration composed of a plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential. Represents a power source and is referred to as power unit PU1.
Symbols Ld (1) to Ld (n) surrounded by a frame indicated by symbol Rc represent a direct-current operation server that is an external element. Is referred to as a load group Ld or an external load group Ld.
The term “external” means an element outside the present invention. The same applies to the following.

Reference numerals 3φ1 and 3φ2 represent external three-phase AC power supplies having different phases, and are respectively referred to as three-phase AC 3φ1 (first three-phase AC) and three-phase AC 3φ2 (second three-phase AC).
A symbol Rc represents a rack that accommodates a server or the like, and is referred to as a rack Rc.

Reference numerals 3φ1in and 3φ2in indicated by broken-line ellipses represent current paths for transmitting an external three-phase AC power source (three-phase AC 3φ1 and three-phase AC 3φ2) to the converter Cn1, and are referred to as a current path 3φ1in and a current path 3φ2in, respectively. .
Symbol HVDCLi represents a current path for transmitting a pulsating direct current output from converter Cn1, and is referred to as current path HVDCLi.

Reference sign Dscgout represents a current path for transmitting a direct current output from the secondary battery assembly Ba1, and is referred to as a current path Dscgout.
The symbol P represents one polarity (positive electrode) of the secondary battery group 1, and the symbol N represents the other polarity (negative electrode) of the secondary battery group 1, and are also referred to as one polarity P and the other polarity N, respectively.

(F-2)
Next, a hardware system configuration and a circuit diagram which are a part of the first embodiment of the power supply system of the present invention will be described with reference to FIG.
FIG. 2 shows the inside of the rack Rc-R and the secondary battery assembly Ba1 that house the converter Cn1 that is a part shown in FIG.

Inside the rack Rc-R, a current path 3φ1in and a current path 3φ2in are wired from the outside of the rack Rc-R to the inside of the rack Rc-R, and the inside of the converter Cn1 surrounded by a broken line inside the rack Rc-R There are rectification units Rect (1) to Rect (j + 1) including one or a plurality of first rectification units and second rectification units (described later).

The positive electrode potential output terminal and the negative electrode potential output terminal of the rectifiers Rect (1) to Rect (j + 1) are coupled to each other and configured as a positive electrode potential output terminal C and a negative electrode potential output terminal A, respectively.

The converter Cn1 in the rack Rc-R is essentially a rectifier circuit, and thus the converter Cn1 is also referred to as a rectifying unit group RectG that is an assembly of rectifying units (in the rack Rc-R in FIG. 2, Cn1 (RectG) is displayed).

In FIG. 2, a plurality of series-connected battery groups 1 indicated by BG surrounded by a broken line inside the secondary battery assembly Ba1 (reference characters B (1), B (2), B (K), B (K + 1)) is referred to as a secondary battery assembly BG, and is composed of secondary batteries B (1) to B (k + 1).
A plurality of secondary batteries B (1) are connected in series and output a necessary potential. The secondary batteries B (1) to B (k + 1) are configured in a plurality of rows from the same battery as the secondary battery B (1).
Furthermore, a parallel assembly of rectifying elements indicated by DG surrounded by a broken line is referred to as a rectifying element group DG and includes diodes D (1) to D (k + 1).
The secondary battery aggregate Ba1 includes a rectifying element group DG, and the secondary battery aggregate BG does not include this.

The positive electrodes of secondary batteries B (1) to B (k + 1) are connected to the anodes of diodes D (1) to D (k + 1), and the cathodes of diodes D (1) to D (k + 1) are connected. The positive electrode potential output terminal indicated by the symbol P and the negative electrodes of the secondary batteries B (1) to B (k + 1) are connected to form the negative electrode potential output terminal indicated by the symbol N.

The diodes D (1) to D (k + 1) are not necessarily arranged in the secondary battery assembly Ba1, and can be accommodated in the rack Rc-R.

(F-3)
Next, the circuit configuration of the rectifiers Rect (1) to Rect (j + 1), which are a part of the first embodiment of the power supply system of the present invention, will be described with reference to FIG.
FIG. 3 is a specific circuit diagram showing a part of any one of the rectifying units Rect (1) to Rect (j + 1) in FIG.
The rectifiers Rect (1) to Rect (j + 1) are all the same circuit.

In FIG. 2, rectifiers Rect (1) to Rect (j + 1) have (j + 1) identical rectifiers connected in parallel. Therefore, in FIG. 3, the arbitrary rectification unit Rect (1) of FIG. 2 will be described.
In FIG. 3, the one connected to the three-phase AC 3φ1 is referred to as a rectifying unit Rect1, the one connected to the three-phase AC 3φ2 is referred to as a rectifying unit Rect2, and these are collectively referred to as a rectifying unit Rect. Both are shown surrounded by broken lines.

In FIG. 3, diodes D1 to D3 and diodes D4 to D6 (hereinafter referred to as rectifier circuit Rcir1), which are rectifier elements surrounded by a broken line, are three-phase full-wave rectifier circuits. Similarly, diodes D7 to D9 and diodes D10 to D12 (hereinafter referred to as rectifier circuit Rcir2), which are rectifier elements surrounded by a broken line, are three-phase full-wave rectifier circuits having the same function as the rectifier circuit 1. .
In FIG. 3, the rectifier Rect1 (first rectifier) and the rectifier circuit Rcir1, and the rectifier Rect2 (second rectifier) and the rectifier circuit Rcir2 are the same. The rectifier circuit is not connected in parallel. The parallel connection will be described with reference to FIG.
The first rectification potential is output from the rectification unit Rect1 (first rectification unit), and the second rectification potential is output from the rectification unit Rect2 (second rectification unit).

As an example, the three-phase AC 3φ1 is a star-connected three-phase AC, and the three-phase AC 3φ2 is a delta-connected three-phase AC.

It is assumed that the three-phase AC 3φ1 and the three-phase AC 3φ2 have an electrical angle phase difference of 1 / 3π (rad). The pulsating part of the DC potential obtained by full-wave rectifying these three-phase alternating currents has an electrical angle phase difference of 1 / 6π (rad).

A positive potential is output to the positive potential output terminal C, which is the rectified potential output terminal in FIG. 3, and a negative potential is output to the negative potential output terminal A, which is the rectified potential output terminal.

In FIG. 1, the positive electrode potential output terminal C of the converter Cn1 and the positive electrode potential output terminal P of the secondary battery assembly Ba1 are combined, and the negative electrode potential output terminal A of the converter Cn1 and the negative electrode potential output terminal N of the secondary battery assembly Ba1. Are coupled to each other and connected to the power unit PU1 through the current path HVDCout.

(F-4)
Referring to FIG. 4, the parallel connection circuit of the rectifier circuit is taken as an example of Rect (1) inside rack Rc-R shown in FIG. 2 which is a part of the first embodiment of the power supply system of the present invention. Will be explained.
Since the rectifiers Rect (1) to Rect (j + 1) are connected in parallel as shown in FIG. 2, the circuit of the rectifier Rect1 indicated by the symbol Rect1 in FIG. Inductors L1, L2, and L3 indicated by symbols L1 to L3 are inserted between a three-phase AC 3φ indicated by 3φ and a rectifier circuit Rcir1-1 indicated by a symbol Rcir1-1.

Furthermore, as shown in FIG. 4, inductors L4, L5, and L6 indicated by reference characters L4 to L6 are provided between a three-phase AC 3φ indicated by reference symbol 3φ and a rectifier circuit Rcir1-2 indicated by reference symbol Rcir1-2. Insert.
The three-phase alternating current 3φ is a generic term for the three-phase alternating current 3φ1 and the three-phase alternating current 3φ2, and both of them may be used.
In FIG. 4, a rectifier circuit Rcir1-1 and a rectifier circuit Rcir1-2 are connected in parallel by inductors L1 to L3 and inductors L4 to L6.
In FIG. 3, the rectifier circuit Rcir1 and the rectifier circuit Rcir2 are not connected in parallel. However, according to FIG. 4, the three-phase AC 3φ1 is connected in parallel like the rectifier circuit Rcir1-1 and the rectifier circuit Rcir1-2. The phase AC 3φ2 can also be connected in parallel like the rectifier circuit Rc2-1 and the rectifier circuit Rcir2-2. (In FIG. 4, the three-phase AC 3φ2, the rectifier circuit Rcir2-1, and the rectifier circuit Rcir2-2 are not shown, but it is assumed that FIGS. 3 and 4 are combined)
In addition, this parallel connection can be expanded without limitation according to the power demand of the load.

(F-5)
With reference to FIG. 5, the inside of the rack Rc shown in FIG. 1 which is a part of the first embodiment of the power supply system of the present invention will be described.

A power unit PU1 (PUd), which is a concentrated power source, exists in the central portion of the rack Rc.

The power unit PU1 includes DC voltage converters Conv1d to Conv5d and a DC voltage converter ConvXd (+1) as a spare device.

The functional performances of the DC voltage converters Conv1d to Conv5d and ConvXd (+1) have the same specifications.
Although the DC voltage converter ConvXd (+1) is a spare device, there is no distinction between a spare device and a normal device. The spare device operates in the same manner as the normal device. There is no need for a human to distinguish between a spare device and a normal device.
The DC voltage converters Conv1d to Conv5d are examples that are not limited to five devices. The number of spare devices is not limited to 1 and may be plural.

As an example, loads Ld (1) to Ld (i), which are servers, exist in the upper part of the same rack Rc, and loads Ld (i + 1) to Ld (n) exist in the lower part of the same rack Rc.
The reason why the load group Ld is divided into upper and lower is to supply current to the load Ld through the shortest current path.

The external loads Ld (1) to Ld (i) belong to the load group LdG1 surrounded by a broken line, and the external loads Ld (i + 1) to loads Ld (n) belong to the load group LdG2 surrounded by a broken line. Belongs.

Within the same rack Rc, there are a pair of bus bars BBL1 and BBL2 and a pair of bus bars BBR1 and BBR2 that have a large current capacity and low power transmission loss.
Since the power unit PU1 and a server as a load are mounted in the rack Rc, a plurality of racks Rc can be connected to the output end of the current path HVDCLi.
Further, since the rectifying unit of the converter Cn1 and the secondary battery group 1 of the secondary battery assembly Ba1 in FIG. 1 can be added, the number of racks Rc can be increased within the allowable power range of the three-phase AC power supply.

Next, with reference to FIG. 1, the connection relationship of the hardware system component which is 1st Embodiment of the power supply system of this invention is demonstrated.

(F-1-2)
In FIG. 1, three-phase AC 3φ1 and three-phase AC 3φ2 are input to the power input section of converter Cn1 through current path 3φ1in and current path 3φ2in, respectively, and a positive potential is applied to positive potential output terminal C of converter Cn1. The negative potential is output to the negative potential output terminal A.

A positive electrode potential is output to the positive electrode potential output terminal P of the secondary battery assembly Ba1, and a negative electrode potential is output to the negative electrode potential output terminal N.

The positive electrode potential output terminal C and the positive electrode potential output terminal P are coupled to one current path of the current path Dscgout and connected to one of the current paths HVDCLi, and the negative electrode potential output terminal A and the negative electrode potential output terminal N are the other of the current path Dscgout. And is connected to the other current path of the current path HVDCLi.

One current path of the current path HVDCLi and the other current path of the current path HVDCLi are connected to the power input unit of the power unit PU1.

The power output unit of the power unit PU1 is connected to the power input units of the loads Ld (1) to Ld (n). The power unit PU1 and loads Ld (1) to Ld (n) are mounted in the rack Rc.

(F-2-2)
Next, with reference to FIG. 2, the connection relationship of the hardware system components which are a part of 1st Embodiment of the power supply system of this invention is demonstrated.

The current path 3φ1in and the current path 3φ2in inside the rack Rc-R connect a three-phase AC power source to each rectifier Rect of the converter Cn1, that is, the rectifiers Rect (1) to Rect (j + 1).
The current path 3φ1in supplies a three-phase AC 3φ1 (star), and the current path 3φ2in supplies a three-phase AC 3φ2 (delta).

The rectified output potentials of the rectifiers Rect (1) to Rect (j + 1) are integrated and output to the positive electrode potential output terminal C and the negative electrode potential output terminal A, respectively.

The secondary battery assembly BG in the secondary battery assembly Ba1 in FIG. 2 outputs a positive electrode potential to the positive electrode potential output terminal P through the rectifying element group DG. The secondary battery assembly BG outputs a negative potential to the negative potential output terminal N.
The rectifying element group DG exists because the secondary battery assembly BG is not charged via the positive potential output terminal P and the negative potential output terminal N due to the potential of the positive potential output terminal C and the negative potential output terminal A of the converter Cn1. .

(F-3-2)
Next, with reference to FIG. 3, the connection relationship of the circuit components of the rectifiers Rect (1) to Rect (j + 1), which are a part of the first embodiment of the power supply system of the present invention, will be described.

The anodes of the diodes D1 to D3 of the rectifier circuit Rcir1 in the rectifier Rect are individually connected to the cathodes of the diodes D4 to D6, respectively, and the transmission lines of the respective phases of the three-phase AC 3φ1 are connected to the connection parts.

The anodes of the diodes D7 to D9 of the rectifier circuit Rcir2 in the rectifier Rect are individually connected to the cathodes of the diodes D10 to D12, respectively, and the transmission lines of the three-phase AC 3φ2 phases are connected to the connection parts.

The cathodes of the diodes D1 to D3 and the cathodes of the diodes D7 to D9 are connected and connected to the positive electrode potential output terminal C.

The anodes of the diodes D4 to D6 and the anodes of the diodes D10 to D12 are connected and connected to the negative potential output terminal A.

(F-4-2)
Next, with reference to FIG. 4, the connection relation of the components of the rectifier circuit circuit Rcir1 and the rectifier circuit circuit Rcir2 of the rectifier unit Rect which is a part of the first embodiment of the power supply system of the present invention will be described. .
In order to connect the rectifiers Rect (1) to Rect (j + 1) in parallel as shown in FIG. 2, the anodes of the diodes D1 to D3 and the diodes D4 to D6 of the rectifier circuit Rcir1-1 are shown in FIG. Inductors L1 to L3 are respectively inserted between the respective cathode connection portions and the transmission lines of the three-phase AC 3φ phases.

Similarly, inductors L4 to L6 are respectively inserted between the connection portions of the respective diodes D1 to D3 of the rectifier circuit Rcir1-2, the respective cathodes of the diodes D4 to D6, and the transmission lines of the three-phase AC 3φ phases. .

  Note that the rectifier circuit Rcir1-1 and the rectifier circuit Rcir1-2 are the same circuit. This rectifier circuit can be connected by an inductor without limitation on the number of parallel connections.

  The positive potential of the circuit connected in parallel in FIG. 4 is integrated at the terminal C2, the negative potential is integrated at the terminal A2, and the parallel connection circuit of the rectifier circuit Rc1-1 and rectifier circuit Rcir1-2 in FIG. The same applies to power supply from the three-phase power supply lines 3φ1 and 3φ2, respectively, and potentials are output to terminals C and A, respectively.

(F-5-2)
Next, with reference to FIG. 5, the connection relationship between the power unit PU1 which is a part of the first embodiment of the power supply system of the present invention and components of an external load will be described.
Although not shown, high-voltage direct current is supplied from the current path HVDCLi to the power input units of the direct-current voltage converters Conv1d to Conv5d and ConvXd (+1).

The power output units of the DC voltage converters Conv1d to Conv5d and ConvXd (+1) apply a potential of one polarity to the bus bars BBL1 and BBR1, and apply a potential of the other polarity to the bus bars BBL2 and BBR2.

A set of bus bar BBL1 and bus bar BBL2 and a set of bus bar BBR1 and bus bar BBR2 are connected to power input units of loads Ld (1) to Ld (n) by individual connectors UC indicated by broken line ellipse symbols UC.
In FIG. 5, the symbol UC is displayed for the connection between the bus bar BBL1 and the bus bar BBL2 and the load Ld (1), but the load of the individual connector UC is also indicated by the symbol UC from the bus bar BBR1 and the bus bar BBR2. In this configuration, connection is possible from either the left or right of Ld (1) to Ld (n).

The power unit PU1 (PUd) is located at the center in the vertical direction of the rack Rc, and the shortest current path (the bus bar BBL1 and the bus bar BBL2 and the bus bar BBR1) is connected to the external load group LdG1 and the external load group LdG2 surrounded by a broken line. Power is supplied by a set of bus bars BBR2.
That is, if power is supplied at a low voltage, for example, approximately 12 V, a large current flows through the bus bar BBL1 and bus bar BBL2 and the bus bar BBR1 and bus bar BBR2.

(1) First Embodiment of Power Supply System (1-2) System Operation The basic operation principle of the power supply system according to the first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, the potential of the three-phase alternating current 3φ1 and the potential of the three-phase alternating current 3φ2 are transmitted through the current path 3φ1in and the current path 3φ2in, respectively, input to the input portion of the converter Cn1, and the negative potential output terminal A of the converter Cn1. A pulsating direct current positive potential (a potential of one polarity of the first direct current potential) is output to the positive potential output terminal C with reference to the potential.
In addition, in FIG. 1, it is good also as a power supply which uses one three-phase alternating current among three-phase alternating current 3phi1 or three-phase alternating current 3phi2. That is, the three-phase alternating current rectified pulsating direct current potential is converted into a low potential reduced by an order of magnitude by the direct current voltage converter, so the pulsating current disappears.
Moreover, it is good also considering a single phase alternating current as a power supply instead of a three-phase alternating current. In this case, a smoothing circuit is added. These single three-phase alternating currents and single-phase alternating currents are collectively referred to as alternating currents, and the rectifying unit that rectifies the alternating currents is referred to as a third rectifying unit. These are not shown.
The pulsating direct current potential output from the positive potential output terminal C of the converter Cn1 by the third rectifier is also a potential of one polarity of the first direct current potential.
As an example, in the circuit configurations of FIGS. 2, 3, and 4, the potential of one polarity of the first DC potential is set as the positive potential, but the configuration of the rectifier circuit is changed to output the negative potential. Accordingly, each potential configuration of the secondary battery aggregate Ba1, the power unit PU1, and the load Ld may be changed.

In FIG. 1, the positive electrode potential output terminal P and the negative electrode potential output terminal N of the secondary battery assembly Ba1 are respectively connected to the positive electrode potential output terminal C and the negative electrode potential output terminal A of the converter Cn1 via the current path Dscgout. The That is, the current path HVDCLi is also connected with the same polarity.

When the potential at the positive electrode potential output terminal C> the potential at the positive electrode potential output terminal P with respect to the potential at the negative electrode potential output terminal A and the negative electrode potential output terminal N, the potential at the positive electrode potential output terminal C is applied to the input unit of the power unit PU1. . The potential at the positive electrode potential output terminal C is the lower limit value of the pulsating direct current.

In the potential comparison between the output terminal C and the output terminal P, the forward voltage drop of the diodes D (1) to D (k + 1) of the rectifying element group DG included in the secondary battery assembly Ba1 in FIG. 2 is ignored. The same applies thereafter.

When the potential at the positive potential output terminal C <the potential at the positive potential output terminal P with respect to the potential at the negative potential output terminal A and the negative potential output terminal N, the potential at the positive potential output terminal P is applied to the input unit of the power unit PU1. .
This event is when the system fails or the system potential drops abnormally.
Even if an abnormality occurs in the system potential other than the power failure of the system, the potential of the positive potential output terminal C> the potential of the positive potential output terminal C> the positive potential output terminal P so that the probability that the potential of the positive potential output terminal C = the positive potential output terminal P is reduced. Therefore, the number of secondary battery groups 1 connected in series is limited.

In FIG. 1, the power unit PU1 accommodated in the rack Rc converts the input high-voltage pulsating DC potential into low-voltage large DC, and supplies power to the load groups Ld (1) to Ld (n) in the rack Rc. .

In FIG. 2, the converter Cn1 performs full-wave rectification of the three-phase AC 3φ1 and the three-phase AC 3φ2 by the rectifiers Rect (1) to Rect (j + 1) of the converter Cn1 accommodated in the rack Rc-R, and outputs a positive potential. The rectified pulsating DC potential is output to the terminal C and the negative electrode potential output terminal A.

In FIG. 2, a current path 3φ1in and a current path 3φ2in indicate that the current path 3φ1in and the current path 3φ2in in FIG. 1 are arranged in the rack Rc-R.

In the rack Rc-R in FIG. 2, the current path 3φ1in and the current path 3φ2in transmit a three-phase AC potential to the rectifying units Rect (1) to Rect (j + 1).

FIG. 3 shows one rectifying unit Rect among the rectifying units Rect (1) to Rect (j + 1) of FIG. A prototype without three-phase AC connected in parallel is shown.
Here, the rectifier circuit Rcir1 (in the rectifier unit Rect1) performs full-wave rectification on the star-connected three-phase AC 3φ1, and the rectifier circuit Rcir2 (in the rectifier unit Rect2) performs full-wave rectification on the delta-connected three-phase AC 3φ1. The cathodes of the diodes D1 to D3 of the diodes and the cathodes of the diodes D7 to D9 of the rectifier circuit Rcir2 are combined and output to the positive electrode potential output terminal C as a positive electrode potential, and the anodes of the diodes D4 to D6 of the rectifier circuit Rcir1 ˜D12 anodes are combined and output to the negative electrode potential output terminal A as a negative electrode potential.
This becomes a terminal for outputting a rectified pulsating DC potential to the outside as the terminal C and the terminal A of the converter Cn1.

4 shows a state in which the rectifier circuit Rcir1 in the rectifier unit Rect1 in FIG. 3 is configured as a parallel connection circuit. The rectifier circuit Rcir1-1 and the rectifier circuit Rcir1-2 are connected in parallel to the same three-phase AC 3φ. Therefore, the inductors L1 to L3 are required for the rectifier circuit Rcir1-1, and the inductors L4 to L6 are required for the rectifier circuit Rcir1-2.

FIG. 4 is applicable to both the three-phase AC 3φ1 and the three-phase AC 3φ2. The number of parallel connections in FIG. 4 is not limited, and can be prepared and increased according to the power demand of the load group.

Terminals C2 and A2 in FIG. 4 represent terminals connected in parallel. Ultimately, terminals C and A of the converter Cn1 serve as terminals for outputting a rectified pulsating DC potential to the outside.

In FIG. 5, the rectified pulsating direct current potential supplied from the current path HVDCLi shown in FIG. 1 (not shown in FIG. 5) is supplied to the power unit PU1 (PUd), and the output potential of the power unit PU1 (PUd) is Electric power is supplied to the external load group LdG1 and the external load group LdG2 via the set, the set of bus bars BBR1 and BBR2.

In FIG. 5, the potential of one polarity of the first DC potential that is the potential of the positive potential output terminal C of the converter Cn1 and the potential of the other polarity of the first DC potential that is the potential of the negative potential output terminal A of the converter Cn1. And DC voltage conversion devices Conv1d to Conv5d that output a second DC potential that is lower than the first DC potential, and a DC voltage conversion device ConvXd (+1) as a spare device.
In other words, the output potential of converter Cn1 is input to power unit PU1 and distributed to each DC voltage converter.

From the DC voltage converters Conv1d to Conv5d and the DC voltage converter ConvXd (+1) as a standby device, a positive electrode potential that is one polarity of the second DC potential is output to the bus bars BBL1 and BBR1. Further, a negative electrode potential that is the other polarity of the second DC potential is output to the bus bars BBL2 and BBR2.
That is, the output potential of each DC voltage converter is integrated by the power unit PU1 and is output from the output end of the power unit PU1 to each bus bar.

Since the first DC potential is a potential difference generated between the positive electrode potential output terminal C and the negative electrode potential output terminal A, the first DC potential is the DC voltage converters Conv1d to Conv5d and the DC voltage converter ConvXd ( +1) input voltage.

Since the second DC potential is a potential difference between the positive electrode potential and the negative electrode potential output from the DC voltage converters Conv1d to Conv5d and the DC voltage converter ConvXd (+1) as a standby device, the second DC potential is converted to the DC voltage converter. This is the output voltage of the devices Conv1d to Conv5d and the DC voltage converter ConvXd (+1) as a standby device.

In FIG. 5, the second DC potential is output to the bus bars BBL1 and BBL2 in the power unit PU1 (PUd) that integrates the output potentials of the DC voltage converters Conv1d to Conv5d and the DC voltage converter ConvXd (+1) as a standby device. The same potential is output to the bus bars BBR1 and BBR2.
In FIG. 5, an individual connector UC indicated by an elliptical broken line indicates a configuration connected to a set of bus bar BBL1 and bus bar BBL2. Although not shown, the individual connector UC is also connected to a set of bus bar BBR1 and bus bar BBR2.
The power input ends of the loads Ld (1) to Ld (n) can be connected from either the bus bar BBL1 and the bus bar BBL2 or the bus bar BBR1 and the bus bar BBR2.

The potential output to the set of bus bars BBL1 and BBL2 and the set of bus bars BBR1 and BBR2 is applied to each load Ld which is a DC operation server indicated by Ld (1) to Ld (n).
That is, the high-voltage DC potential from the converter Cn1 is supplied to each DC voltage conversion device, converted into a low-voltage large-current DC potential, and supplied to the load group Ld.

(1) First Embodiment of Power Supply System (1-3-1) Operation for Allocating Electric Power to Load Group Ld FIG. A basic operation principle for allocating power to the load group Ld will be described.

The power unit PU1 includes a plurality of DC voltage converters that receive a first DC potential and output a second DC potential that is lower than the first DC potential.
When the second DC potential is output from the plurality of DC voltage conversion devices, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
The plurality of DC voltage conversion devices Conv1d to Conv5d and the DC voltage conversion device ConvXd (+1) as a standby device optionally have output power and / or output current management means.
That is, one or a plurality of DC voltage converters optionally include output power and / or output current management means.
Hereinafter, the plurality of DC voltage conversion devices Conv1d to Conv5d (referred to as normal devices) and the DC voltage conversion device ConvXd (+1) as the backup devices shown as an example in FIG. 5 eliminate the distinction between the normal devices and the backup devices. Each device is simply referred to as a DC voltage converter.

Arbitrary one unit (one device) of the DC voltage converters having output power and / or output current management means is connected to the second DC voltage in the other DC voltage converters from other DC voltage converters other than itself. The output power and / or output current information is provided according to the position.

An arbitrary unit of DC voltage converter includes output power and / or output current information based on its second DC potential, output power and / or output current information based on a second DC potential in another DC voltage converter, Based on the total number of units of the plurality of DC voltage conversion devices including itself, the operation or non-operation of the plurality of DC voltage conversion devices is determined by the output power and / or output current management means of any one unit.
The total number of units of a plurality of DC voltage converters including itself is a value obtained by adding an arbitrary unit of DC voltage converters (one device) and the number of other DC voltage converters.

That is, the output power and / or output current management means determines the number of operating devices of the plurality of DC voltage converters (excluding spare devices), and calculates the total demand power or total current amount required by each load Ld. A plurality of DC voltage converters (including any one unit of DC voltage converters (one device), excluding spare devices) are operated to equalize the total power or total current supplied. However, the spare device is always operated.
That is, the number of normal devices is determined and a spare device is added to determine the total number of operating DC voltage converters.
Therefore, the “output power and / or output current” management means determines the total output power or the total output current amount output from the plurality of DC voltage converters without distinguishing the plurality of DC voltage converters (the normal device and the standby device, (Including all), the integer part of the value divided by the standard supply power per unit is the quotient, the remainder of the value is the remainder, the remainder is 1 when the remainder is a predetermined value 1 or more, and the remainder is When the value is less than the predetermined value 1, the remainder is set to 0, and the value obtained by adding the quotient, the remainder, and the predetermined value 2 is defined as the number of operations of the DC voltage converter.
This is because the spare device must always be in an operating state in order to avoid a decrease in power supply to the load group Ld.
Note that the DC voltage converters Conv1d to Conv5d and the DC voltage converter ConvXd (+1) as a standby device are distinguished in the notation of the drawings, but are actually the same and not distinguished.

The “output power and / or output current” management means determines the total output power or the total output current amount output from the plurality of DC voltage converters, without distinguishing the plurality of DC voltage converters (regardless of normal devices and standby devices). The integer part of the value divided by the standard supply power per unit) is the quotient, the remainder of the value is the remainder, the remainder is 1 when the remainder is greater than or equal to the predetermined value 1, and the remainder is the predetermined When the value is less than 1, the remainder is set to 0, and the value obtained by adding the quotient, the remainder, and the predetermined value 2 is the number of operations of the DC voltage converter. The number of power supply units is added to the standard supply power of the DC voltage converter. When the multiplied value exceeds the total demand power of the load group Ld, the output power / current is suppressed by the feedback function of the DC voltage converter.

Specifically, the output power and / or output current management means performs the following calculation. In the power unit PU1 in one rack Rc, there are X DC voltage converters including a spare device, and a standard (or rated) output current per unit of DC voltage converter is Y (A). To do.

Assume that loads Ld (1) to Ld (n) consume a current of Z (A) as a total amount. (N is an arbitrary integer, 1 or more.) That is, it is assumed that a plurality of loads Ld operate and consume a current of Z (A).
This is the same as the total output current amount Z (A) output by a plurality of DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand current (not the maximum. Current demand) of the load group Ld is Z (A), and the total supply current capability I _(max) (A) of the DC voltage converter is I _(max) (A) = Y (A) × X.
Y (A) is a standard (rated) output current amount output from the DC voltage converter 1 and X is the number of DC voltage converters. (A) is an ampere.
However, it is assumed that a plurality of DC voltage converters are supplied with a potential / current sufficient to output I _(max) (A).

The calculation formula for the required number of devices of the DC voltage converter is A = INT (Z / Y) + Re + α, with the unit of current (A) ampere omitted, where A is the required number of devices.
In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1 is set, and when Re <predetermined value 1 and Re = 0.2, the allowance (effective value) of the DC voltage converter is taken into consideration. , Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. Since the above calculation is for all DC voltage converters, the number of DC voltage converters excluding the number of spare devices is calculated using the formula “INT (Z / Y) + Re”, and the number of spare devices α is calculated by this calculation. Add to the result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be recognized by either the system or humans.
From the above equation, the required number A of DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating DC voltage converters is A, and the number of DC voltage converters to be stopped is (X−A). That is, (X-A) DC voltage converters save power, and the A DC voltage converters operate efficiently.

In this way, the number of operating DC voltage converters in the power unit PU1 is limited to A, and the power supply efficiency of the power unit PU1 is maintained at the maximum by increasing the operating rate of the operating DC voltage converter.
The output power and / or output current management means always monitors the output power and / or output current amount of a plurality of DC voltage converters, and if the output current amount increases, the number of DC voltage converters of B> A is B. To operate.
When the amount of output current decreases, the number C of DC voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power and output current, and outputs a signal instructing whether to stop or operate the DC voltage converter, thereby controlling the operation of the DC voltage converter. .
If all the DC voltage converters in the power unit PU1 are operated without such control, the output current of each DC voltage converter is less than the rated value and the voltage conversion efficiency is lowered.

The same applies when calculating with the output power of the DC voltage converter.
There are X DC voltage converters in the power unit PU1 in one rack Rc, and the standard (may be referred to as rating) output power per unit of DC voltage converter is Y2 (W).

It is assumed that the loads Ld (1) to Ld (n) consume Z2 (W) power as a total amount. (N is an arbitrary integer and is 1 or more.) That is, it is assumed that the load Ld operates by one or more and consumes Z2 (W) power.
This is the same as the total output power Z2 (W) output by a plurality of DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand power (not the maximum. Current demand) of the load group Ld is Z2 (W), and the total power supply capacity P _(max) (W) of the DC voltage converter is P _(max) (W) = Y2 (W) × X.
Y2 (W) is the standard (rated) output power amount output from the DC voltage converter 1 device (one unit), and X is the number of DC voltage converter devices. (W) is watts.
However, it is assumed that a plurality of DC voltage converters are supplied with a potential / current sufficient to output P _(max) (W).

The calculation formula for the required number of devices of the DC voltage converter is A = INT (Z2 / Y2) + Re + α, with the unit of power (W) watts being omitted, where A is the required number of devices. In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1 is set, and when Re <predetermined value 1 and Re = 0.2, the allowance (effective value) of the DC voltage converter is taken into consideration. , Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. In the above calculation, since all DC voltage converters are targeted, the number of DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z2 / Y2) + Re”, and the number of spare devices α is calculated by this calculation. Add to the result. In many cases, the number of spare devices α is 1. However, in some cases, the number α may be plural. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be done by either the system or the human.
From the above equation, the required number A of DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating DC voltage converters is A, and the number of DC voltage converters to be stopped is (X−A). That is, (X-A) DC voltage converters save power, and the A DC voltage converters operate efficiently.

In this way, the number of operating DC voltage converters in the power unit PU1 is limited to A, and the power supply efficiency of the power unit PU1 is maintained at the maximum by increasing the operating rate of the operating DC voltage converter.
The output power and / or output current management means constantly monitors the output power and / or output current amount of a plurality of DC voltage converters, and if the output power amount increases, the number of DC voltage converters of B> A is B. To operate.
When the amount of output power decreases, the number C of DC voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power and output current, and outputs a signal instructing whether to stop or operate the DC voltage converter, thereby controlling the operation of the DC voltage converter. .
If all the DC voltage converters in the power unit PU1 are operated without such control, the output power of each DC voltage converter is less than the rated value and the voltage conversion efficiency is lowered.

(1-3-2) Operation for Distributing Power to Load Group Ld Although not shown in FIG. 5, the power supply system according to the first embodiment of the present invention is not a DC voltage conversion device but a separate management device 1 The basic operation principle of allocating power to the external load group Ld in FIG.

The power unit PU1 includes a plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential, and output power and / or output inside or outside the power unit PU1. A management device 1 having current management means is provided.

When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.

The management device 1 receives output power and / or output current information based on the second DC potential from a plurality of DC voltage conversion devices.

Based on the output power and / or output current information and the total number of units (total number of devices) of the plurality of DC voltage converters, the management device 1 is managed by the output power and / or output current management means of the management device 1. The operation or non-operation of the DC voltage converter is determined.

The description of the management apparatus 1 is based on the description of the arbitrary one unit of DC voltage converter. The calculation is the same, and the calculation is based on the output power of the DC voltage converter.
There are X DC voltage converters in the power unit PU1 in one rack Rc, and the standard (may be referred to as rating) output power per unit of DC voltage converter is Y2 (W).

It is assumed that the loads Ld (1) to Ld (n) consume Z2 (W) power as a total amount. (N is an arbitrary integer and is 1 or more.) In other words, it is assumed that the load Ld1 or a plurality of operations operates to consume the power of Z2 (W).
This is the same as the total output power Z2 (W) output by a plurality of DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand power (not the maximum. Current demand) of the load group Ld is Z2 (W), and the total power supply capability P _(max) (W) of the DC voltage converter is P _(max) (W). = Y2 (W) × X.
Y2 (W) is a standard (rated) output power amount output from the DC voltage converter 1 and X is the number of DC voltage converters. (W) is watts.
However, it is assumed that a plurality of DC voltage converters are supplied with a potential / current sufficient to output P _(max) (W).

The calculation formula for the required number of devices of the DC voltage converter is A = INT (Z2 / Y2) + Re + α, with the unit of power (W) watts being omitted, where A is the required number of devices. In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the decimal point of the quotient) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1 is set, and when Re <predetermined value 1 and Re = 0.2, the allowance (effective value) of the DC voltage converter is taken into consideration. , Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. In the above calculation, since all DC voltage converters are targeted, the number of DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z2 / Y2) + Re”, and the number of spare devices α is calculated by this calculation. Add to the result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be done by either the system or the human.
From the above equation, the required number A of DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the spare device number α is included in the calculation of the required number of DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating DC voltage converters is A, and the number of DC voltage converters to be stopped is (X−A). That is, (X-A) DC voltage converters save power, and the A DC voltage converters operate efficiently.

In this way, the number of operating DC voltage converters in the power unit PU1 is limited to A, and the power supply efficiency of the power unit PU1 is maintained at the maximum by increasing the operating rate of the operating DC voltage converter.
The output power and / or output current management means constantly monitors the output power and / or output current amount of a plurality of DC voltage converters, and if the output power amount increases, the number of DC voltage converters of B> A is B. To operate.
When the amount of output power decreases, the number C of DC voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power and output current, and outputs a signal instructing whether to stop or operate the DC voltage converter, thereby controlling the operation of the DC voltage converter. .
If all the DC voltage converters in the power unit PU1 are operated without such control, the output power of each DC voltage converter is less than the rated value and the voltage conversion efficiency is lowered.

(1-3-3) Operation for Distributing Power to Load Group Ld Although not shown in FIG. 5, the power supply system according to the first embodiment of the present invention is not a DC voltage converter but a separate management device 2 The basic operation principle of allocating power to the external load group Ld in FIG.

The management device 2 has a server function. Therefore, an artificial operation is possible by the LAN.

The power unit PU1 includes a plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential, and output power and / or output inside or outside the power unit PU1. A management device 2 having current management means is provided.

When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.

The management device 2 receives output power and / or output current information based on the second DC potential from a plurality of DC voltage conversion devices.

Based on the output power and / or output current information and the total number of units (total number of devices) of the plurality of DC voltage converters, the management device 2 uses the output power and / or output current management means that the management device 2 has, Alternatively, the operation or non-operation of the plurality of DC voltage converters is determined according to an external artificial command.

The description of the management device 2 is based on the description given by the arbitrary one unit of DC voltage converter. The calculation is the same, and the calculation is based on the output power of the DC voltage converter.
There are X DC voltage converters in the power unit PU1 in one rack Rc, and the standard (may be referred to as rating) output power per unit of DC voltage converter is Y2 (W).

It is assumed that the loads Ld (1) to Ld (n) consume Z2 (W) power as a total amount. (N is an arbitrary integer and is 1 or more.) That is, it is assumed that the load Ld operates by one or more and consumes Z2 (W) power.
This is the same as the total output power Z2 (W) output by a plurality of DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand power (not the maximum. Current demand) of the load group Ld is Z2 (W), and the total power supply capacity P _(max) (W) of the DC voltage converter is P _(max) (W) = Y2 (W) × X.
Y2 (W) is a standard (rated) output power amount output from the DC voltage converter 1 and X is the number of DC voltage converters. (W) is watts.
However, it is assumed that a plurality of DC voltage converters are supplied with a potential / current sufficient to output P _(max) (W).

The calculation formula for the required number of devices of the DC voltage converter is A = INT (Z2 / Y2) + Re + α, with the unit of power (W) watts being omitted, where A is the required number of devices. In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1 is set, and when Re <predetermined value 1 and Re = 0.2, the allowance (effective value) of the DC voltage converter is taken into consideration. , Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. In the above calculation, since all DC voltage converters are targeted, the number of DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z2 / Y2) + Re”, and the number of spare devices α is calculated by this calculation. Add to the result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be done by either the system or the human.
From the above equation, the required number A of DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating DC voltage converters is A, and the number of DC voltage converters to be stopped is (X−A). That is, (X-A) DC voltage converters save power, and the A DC voltage converters operate efficiently.

In this way, the number of operating DC voltage converters in the power unit PU1 is limited to A, and the power supply efficiency of the power unit PU1 is maintained at the maximum by increasing the operating rate of the operating DC voltage converter.
The output power and / or output current management means constantly monitors the output power and / or output current amount of a plurality of DC voltage converters, and if the output power amount increases, the number of DC voltage converters of B> A is B. To operate.
When the amount of output power decreases, the number C of DC voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power or output current, the output power and the output current, and outputs a signal that instructs whether to stop or operate the DC voltage converter. Control the operation of the device.
If all the DC voltage converters in the power unit PU1 are operated without such control, the output power of each DC voltage converter is small and the voltage conversion efficiency is lowered.

The management device 2 can level the DC voltage converter without switching the DC voltage converter by an artificial operation or concentrating the operation of the DC voltage converter on a specific device.
That is, the MTBF of the DC voltage converter is considered.

The statistics can be analyzed in various ways depending on the collected data, such as the operating rate of the load Ld and the operating rate of the DC voltage converter.

It is also possible to measure the power saving effect.

(2) Second Embodiment of Power Supply System (2-1) System Configuration FIG. 8 is a schematic hardware system configuration showing the basic principle of a power supply system according to the second embodiment of the present invention. FIG.
Note that incidental elements not related to the basic part of the present invention are omitted in FIG. 8, but will be described in terms of the specification.

FIG. 8 shows an effective use of the AC power supply system (so-called AC input / AC output UPS power supply system) of the prior art shown in FIG. 6 having a converter and an inverter, and a centralized power supply system (power unit). This is a power supply system that introduces PU2) to improve the efficiency of the power supply unit.

Before describing FIG. 8 showing the basic principle of the power supply system according to the second embodiment of the present invention and FIG. 6 of the prior art, the significance of this embodiment will be described.

In the past (even now), the method of FIG. 6 is the mainstream, that is, the high-voltage DC power supply is constrained by the concept that current interruption is difficult and dangerous, while fully knowing the good power efficiency of the high-voltage DC power supply. However, it was not possible to step on high-voltage DC power supply.

In recent years, the safety of high-voltage direct current power supply and the technology of direct current interruption have progressed, and there is a movement to shift to high-voltage direct current power supply. However, there are also facilities for which the amortization of the AC power supply system of the prior art AC power supply system has not been completed, and a recently built AC power supply system.

Discarding these systems and building a new high-voltage DC power supply system is uneconomical for data center operators and is a waste of resources globally.

Therefore, a system for increasing the total efficiency of the power supply system has been invented by effectively using the AC power supply system of the conventional AC power supply system in the front stage of the entire system. This is the second embodiment of the present invention shown in FIG.

In the following, each element of the system and connection form will be described with reference to FIG.
The AC power source indicated by reference numeral 3φ in FIG. 8 is a three-phase AC and is referred to as a three-phase AC 3φ.
The converter denoted by reference symbol Cn2 includes a rectifier circuit (including a PFC circuit) that removes the pulsating flow and maintains the rectified output potential with high accuracy, a smoothing circuit, a constant voltage circuit, and the like, and is referred to as a converter Cn2.

A current path indicated by reference numeral 3φin is a current path for transmitting the power of the three-phase AC 3φ to the converter Cn2, and is referred to as a current path 3φin.
The power of the three-phase AC 3φ is transmitted through the current path 3φin and input to the converter Cn2.

The DC output potential of the converter Cn2 is output from the positive potential output terminal 1 indicated by reference numeral 1 and the negative potential output terminal 2 indicated by reference numeral 2 in FIG. These ends are referred to as a positive electrode potential output terminal 1 and a negative electrode potential output terminal 2, respectively.

The secondary battery assembly indicated by symbol Ba2 is the same as the secondary battery assembly BG surrounded by a broken line in FIG. 2, and a secondary battery assembly that does not include the rectifying element group DG surrounded by the broken line in FIG. This is referred to as part Ba2.

The DC output potential of the secondary battery assembly Ba2 is output from the positive electrode potential output terminal 3 indicated by reference numeral 3 and the negative electrode potential output terminal 4 indicated by reference numeral 4 in FIG. These are referred to as a positive electrode potential output terminal 3 and a negative electrode potential output terminal 4, respectively.

The inverter indicated by the symbol In2 generates a three-phase alternating current from a direct current and is referred to as an inverter In2.

The positive electrode potential output terminal 3 is connected to the positive electrode potential output terminal 1 through a current path having one polarity of a current path CgDcg indicated by a symbol CgDcg and connected to a current path having one polarity of a current path DCLi indicated by a symbol DCLi. Is done.
Further, the negative electrode potential output terminal 4 is connected to the negative electrode potential output terminal 2 through a current path having the other polarity of the current path CgDcg and connected to a current path having the other polarity of the current path DCLi.
Reference sign DCLi is referred to as current path DCLi, and reference sign CgDcg is referred to as current path CgDcg.

The current path DCLi is configured to transmit the potential of the converter Cn2 and / or the secondary battery assembly Ba2 to the inverter In2. That is, the output end of the current path DCLi is connected to the input end of the inverter In2.

The output end of the inverter In2 is connected to a current path 3φout indicated by reference numeral 3φout, and a three-phase AC potential is output from the output end of the current path 3φout.
In the above description, the input end and output end of each component are not shown, but since power is transmitted from the left side to the right side when looking straight at FIG. 8, the left end of each element is the input end and the right end is This is the output end. The same applies to the following.

The above description is the same as FIG. That is, the portion excluding the rack Rc surrounded by the line indicated by the symbol Rc in FIGS. 8 and 6 is the same.
6 overlaps with the description of FIG. 8, the description of FIG. 8 is used for the description of FIG. 6, and the description of FIG. 6 is omitted. In addition, the code | symbol of FIG. 8 demonstrated above is the same as FIG.

Next, in FIG. 6, the output end of the current path 3φout is connected to the input ends of the loads La (1) to La (n) indicated by the symbols La (1) to La (n) in the rack Rc. The

The inside of the rack Rc of FIG. 6 is shown by FIG. In FIG. 7, the current path 3φin in the rack Rc is connected to the loads La (1) to La (n) in the load group LaG by the individual wiring UW indicated by the symbol UW.

In FIG. 8, the output end of the current path 3φout is connected to the input end of the power unit PU2, and is connected to the input ends of the loads Ld (1) to Ld (n) from the output end of the power unit PU2.

The inside of the rack Rc of FIG. 8 is shown by FIG.
The power unit PU2 is composed of AC / DC voltage converters Conv1a to ConvXa (+1).

In FIG. 9, the output end of the current path 3φout (not shown) is connected to the input end of the power unit PU2.
Although not shown, specifically, the input terminals of the AC / DC voltage converters Conv1a to Conv5a in the power unit PU2 and the AC / DC voltage converter apparatus ConvXa (+1) as a spare device are connected to the input terminal of the power unit PU2.
That is, each AC / DC voltage converter receives power from the inverter In2.

In FIG. 9, the output end of the power unit PU2 is connected to a set of bus bars BBL1 and BBL2 and a set of bus bars BBR1 and BBR2.
Although not shown, in reality, the output terminals of the AC / DC voltage converters Conv1a to Conv5a in the power unit PU2 and the AC / DC voltage converter apparatus ConvXa (+1) as the standby apparatus are connected to the output terminal of the power unit PU2, and this output The ends are connected to a set of bus bars BBL1 and BBL2, and a set of bus bars BBR1 and BBR2.
That is, the output power of the power unit PU2 is obtained by integrating the output powers of the AC / DC voltage conversion devices Conv1a to Conv5a and the AC / DC voltage conversion device ConvXa (+1) as a standby device.

In FIG. 9, each of the loads Ld (1) to La (i) in the load group LdG1 and the loads LdG2 in the load group LdG1 are separated from the set of the bus bar BBL1 and the bus bar BBL2 in the rack Rc by the individual connector UC. Connected to loads Ld (i + 1) to Ld (n), respectively.
That is, the high-voltage three-phase AC potential from the inverter In2 is supplied to each AC / DC voltage converter, converted into a low-voltage and large-current DC potential, and supplied to the load group Ld.
The low-voltage large-current DC potential and the load group Ld are the same as those in the first embodiment.

In FIG. 9, the individual connector UC shows a configuration connected to a set of bus bar BBL1 and bus bar BBL2. Although not shown, the individual connector UC is also connected to a set of bus bar BBR1 and bus bar BBR2.

The power input terminals of the loads Ld (1) to Ld (n) can be connected from either the bus bar BBL1 and the bus bar BBL2 or the bus bar BBR1 and the bus bar BBR2.

(2) Second Embodiment of Power Supply System (2-2-1) Operation for Allocating Electric Power to Load Group Ld With reference to FIG. 9, the external power supply system according to the second embodiment of the present invention A basic operation principle for allocating power to the load group Ld will be described.

The power unit PU2 includes a plurality of AC / DC voltage converters that receive a three-phase AC potential and output a DC potential that is lower than the AC potential.
When a direct current potential is output from a plurality of alternating current direct current voltage converters, the direct current potential is integrated with substantially the same potential with the same polarity and supplied to the outside.
The plurality of AC / DC voltage converters Conv1a to Conv5a and the DC voltage converter ConvXa (+1) as a spare device optionally have output power and / or output current management means.
That is, one or more DC / AC voltage converters optionally have output power and / or output current management means.
Hereinafter, the plurality of AC / DC voltage converters Conv1a to Conv5a (referred to as normal devices) and the auxiliary DC / DC voltage converter ConvXa (+1) shown as an example in FIG. Each device is simply referred to as an AC / DC voltage converter.

Arbitrary one unit (one device) of the AC / DC voltage converters having the output power and / or output current management means is connected to the DC power in other AC / DC voltage converters from other AC / DC voltage converters other than itself. The output power and / or output current information is provided according to the position.

An arbitrary unit of the AC / DC voltage converter has the output power and / or output current information by its own DC potential, the output power and / or output current information by the DC potential in another AC / DC voltage converter, and the self Based on the total number of units of the plurality of AC / DC voltage converters included, the operation or non-operation of the plurality of AC / DC voltage converters is determined by the output power and / or output current management means of an arbitrary unit.
The total number of units of a plurality of AC / DC voltage converters including itself is a value obtained by adding an arbitrary unit of AC / DC voltage converters (one device) and the number of other AC / DC voltage converters.

That is, the output power and / or output current management means determines the number of operating devices of the plurality of AC / DC voltage converters (excluding spare devices), and determines the total demand power or current amount required by each load Ld. A plurality of AC / DC voltage converters (including any one unit of AC / DC voltage converters (one device), excluding spare devices) are operated to equalize the total power or the total current supplied. However, the spare device is always operated.
That is, the number of normal devices is determined and a spare device is added to determine the total number of operating AC / DC voltage converters.
Therefore, the output power and / or output current management means can calculate the total output power or the total output current amount output from the plurality of AC / DC voltage converters without distinguishing between the plurality of AC / DC voltage converters (normal device and standby device, (Including all), the integer part of the value divided by the standard supply power per unit is the quotient, the remainder of the value is the remainder, the remainder is 1 when the remainder is a predetermined value 1 or more, and the remainder is When the value is less than the predetermined value 1, the remainder is set to 0, and the value obtained by adding the quotient, the remainder, and the predetermined value 2 is defined as the number of operations of the AC / DC voltage converter.
This is because the spare device must always be in an operating state in order to avoid a decrease in power supply to the load group Ld.
Note that the AC / DC voltage converters Conv1a to Conv5a and the AC / DC voltage converters ConvXa (+1) as the spare devices are distinguished in the notation of the drawings, but are actually the same and not distinguished.

The output power and / or output current management means determines the total output power or the total output current amount output from the plurality of AC / DC voltage converters, without distinguishing the plurality of AC / DC voltage converters (regardless of the normal device and the standby device). The integer part of the value divided by the standard supply power per unit) is the quotient, the remainder of the value is the remainder, the remainder is 1 when the remainder is greater than or equal to the predetermined value 1, and the remainder is the predetermined When the value is less than 1, the remainder is set to 0, and the value obtained by adding the quotient, the remainder and the predetermined value 2 is the number of operations of the AC / DC voltage converter. When the value multiplied by the number exceeds the total demand power of the load group Ld, the output power / current is suppressed by the feedback function of the AC / DC voltage converter.

Specifically, the output power and / or output current management means performs the following calculation. In the power unit PU2 in one rack Rc, there are X AC / DC voltage converters including a spare device, and a standard (or rated) output current per unit of the AC / DC voltage converter is Y (A ).

Assume that loads Ld (1) to Ld (n) consume a current of Z (A) as a total amount. (N is an arbitrary integer, 1 or more.) That is, it is assumed that a plurality of loads Ld operate and consume a current of Z (A).
This is the same as the total output current amount Z (A) output by a plurality of AC / DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand current (not the maximum. Current demand) of the load group Ld is Z (A), and the total supply current capacity I _(max) (A) of the AC / DC voltage converter is I _(max) (A ) = Y (A) × X.
Y (A) is the standard (rated) output current amount output from the AC / DC voltage converter 1 and X is the number of AC / DC voltage converters. (A) is an ampere.
However, it is assumed that a plurality of AC / DC voltage converters are supplied with a potential / current sufficient to output I _(max) (A).

The calculation formula for the required number of AC / DC voltage converters is A = INT (Z / Y) + Re + α by omitting the unit of current (A) ampere, where A is the required number of devices.
In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1, and when Re <predetermined value 1 and Re = 0.2, the allowance (actual value) of the AC / DC voltage converter is taken into consideration. Thus, Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. In the above calculation, since all AC / DC voltage converters are targeted, the number of AC / DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z / Y) + Re”, and the number of spare devices α is calculated. Add to this calculation result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be done by either the system or the human.
From the above equation, the required number A of AC / DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of AC / DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating AC / DC voltage converters is A, and the number of AC / DC voltage converters to be stopped is (X−A). That is, (X-A) AC / DC voltage converters save power, and the A / DC voltage converters operate efficiently.

In this way, the number of operating AC / DC voltage converters in the power unit PU2 is limited to A, and the power supply efficiency of the power unit PU2 is maintained at the maximum by increasing the operating rate of the operating AC / DC voltage converter.
The output power and / or output current management means always monitors the output power and / or output current amount of a plurality of AC / DC voltage converters, and if the output current amount increases, the number of AC / DC voltages B> A. Operate the converter.
If the amount of output current decreases, the number C of AC direct current voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power and output current, outputs a signal instructing whether to stop or operate the AC / DC voltage converter, and controls the operation of the AC / DC voltage converter. Control.
If all the AC / DC voltage converters in the power unit PU2 are operated without such control, the output current of each AC / DC voltage converter is small and the voltage conversion efficiency is lowered.

The same applies when calculating with the output power of the AC / DC voltage converter.
There are X AC / DC voltage converters in the power unit PU2 in one rack Rc, and the standard output power per unit of AC / DC voltage converters (may be referred to as a rating) is Y2 (W).

It is assumed that the loads Ld (1) to Ld (n) consume Z2 (W) power as a total amount. (N is an arbitrary integer, 1 or more.) That is, it is assumed that a plurality of loads Ld operate to consume power of Z2 (W).
This is the same as the total output power Z2 (W) output by a plurality of AC / DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand power (not the maximum. Current demand) of the load group Ld is Z2 (W), and the total supply power capacity P _(max) (W) of the AC / DC voltage converter is P _(max) (W ) = Y2 (W) × X.
Y2 (W) is a standard (rated) output power amount output from the AC / DC voltage converter 1 and X is the number of AC / DC voltage converters. (W) is watts.
However, it is assumed that a plurality of AC / DC voltage converters are supplied with a potential / current sufficient to output P _(max) (W).

The calculation formula for the required number of AC / DC voltage converters is A = INT (Z2 / Y2) + Re + α, with the unit of power (W) watts omitted, where A is the required number of devices. In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1, and when Re <predetermined value 1 and Re = 0.2, the allowance (actual value) of the AC / DC voltage converter is taken into consideration. Thus, Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. Since the above calculation is intended for all cross-flow voltage converters, the number of AC / DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z2 / Y2) + Re”, and the number of spare devices α Is added to the calculation result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be done by either the system or the human.
From the above equation, the required number A of AC / DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of AC / DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating AC / DC voltage converters is A, and the number of AC / DC voltage converters to be stopped is (X−A). That is, (X-A) AC / DC voltage converters save power, and the A / DC voltage converters operate efficiently.

As described above, the number of operating AC / DC voltage converters in the power unit PU2 is limited to A, and the operating rate of the operating AC / DC voltage converter is increased, thereby supplying power while maintaining the power efficiency of the power unit PU1 to the maximum.
The output power and / or output current management means always monitors the output power and / or output current amount of a plurality of AC / DC voltage converters, and if the output power amount increases, the number of AC / DC voltages B> A. Operate the converter.
If the amount of output power decreases, the number C of AC direct current voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power and output current, outputs a signal instructing whether to stop or operate the AC / DC voltage converter, and controls the operation of the AC / DC voltage converter. Control.
If all the AC / DC voltage converters in the power unit PU2 are operated without such control, the output power of each AC / DC voltage converter is small and the voltage conversion efficiency is lowered.

(2-2-2) Operation for Distributing Power to Load Group Ld Although not shown in FIG. 9, the power supply according to the second embodiment of the present invention is not an AC / DC voltage converter but another management device 1 The basic operation principle for distributing power to the external load group Ld in the system will be described.

The power unit PU2 includes a plurality of AC / DC voltage converters that input an AC potential and output a DC potential that is lower than the AC potential, and has output power and / or output current management means inside or outside the power unit PU2. A management device 1 is provided.

When a direct current potential is output from a plurality of alternating current direct current voltage converters, the direct current potential is integrated with substantially the same potential with the same polarity and supplied to the outside.

The management device 1 receives output power and / or output current information based on a DC potential from a plurality of AC / DC voltage converters.

The management device 1 uses the output power and / or output current management means of the management device 1 based on the output power and / or output current information and the total number of units (total number of devices) of the plurality of AC / DC voltage converters. The operation or non-operation of the plurality of AC / DC voltage converters is determined.

The description of the management apparatus 1 is based on the description given by the above arbitrary one unit AC / DC voltage converter. The calculation is the same, and the calculation is based on the output power of the AC / DC voltage converter.
There are X AC / DC voltage converters in the power unit PU2 in one rack Rc, and the standard output power per unit of AC / DC voltage converters (may be referred to as a rating) is Y2 (W).

It is assumed that the loads Ld (1) to Ld (n) consume Z2 (W) power as a total amount. (N is an arbitrary integer, 1 or more.) That is, it is assumed that a plurality of loads Ld operate to consume power of Z2 (W).
This is the same as the total output power Z2 (W) output by a plurality of AC / DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand power (not the maximum. Current demand) of the load group Ld is Z2 (W), and the total supply power capacity P _(max) (W) of the AC / DC voltage converter is P _(max) (W ) = Y2 (W) × X.
Y2 (W) is a standard (rated) output power amount output from the AC / DC voltage converter 1 and X is the number of AC / DC voltage converters. (W) is watts.
However, it is assumed that a plurality of AC / DC voltage converters are supplied with a potential / current sufficient to output P _(max) (W).

The calculation formula for the required number of AC / DC voltage converters is A = INT (Z2 / Y2) + Re + α, with the unit of power (W) watts omitted, where A is the required number of devices. In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1, and when Re <predetermined value 1 and Re = 0.2, the allowance (actual value) of the AC / DC voltage converter is taken into consideration. Thus, Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. Since the above calculation is intended for all cross-flow voltage converters, the number of AC / DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z2 / Y2) + Re”, and the number of spare devices α Is added to the calculation result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 2 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be done by either the system or the human.
From the above equation, the required number A of AC / DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of AC / DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating AC / DC voltage converters is A, and the number of AC / DC voltage converters to be stopped is (X−A). That is, (X-A) AC / DC voltage converters save power, and the A / DC voltage converters operate efficiently.

As described above, the number of operating AC / DC voltage converters in the power unit PU2 is limited to A, and the operating rate of the operating AC / DC voltage converter is increased, thereby supplying power while maintaining the power efficiency of the power unit PU1 to the maximum.
The output power and / or output current management means always monitors the output power and / or output current amount of a plurality of AC / DC voltage converters, and if the output power amount increases, the number of AC / DC voltages B> A. Operate the converter.
If the amount of output power decreases, the number C of AC direct current voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power and output current, outputs a signal instructing whether to stop or operate the AC / DC voltage converter, and controls the operation of the AC / DC voltage converter. Control.
If all the AC / DC voltage converters in the power unit PU2 are operated without such control, the output power of each AC / DC voltage converter is small and the voltage conversion efficiency is lowered.

(2-2-3) Operation for Distributing Power to Load Group Ld Although not shown in FIG. 9, the power supply according to the second embodiment of the present invention is not an AC / DC voltage converter but another management device 2 The basic operation principle for distributing power to the external load group Ld in the system will be described.

The management device 2 has a server function. Therefore, an artificial operation is possible by the LAN.

The power unit PU2 is provided with a plurality of AC / DC voltage converters that input an AC potential and output a DC potential that is lower than the AC potential, and has output power and / or output current management means inside or outside the power unit PU2. The management apparatus 2 which has is provided.

When a direct current potential is output from a plurality of alternating current direct current voltage converters, the direct current potential is integrated with substantially the same potential with the same polarity and supplied to the outside.

The management device 2 receives output power and / or output current information based on its own DC potential from a plurality of AC / DC voltage converters.

The management device 2 uses the output power and / or output current management means of the management device 2 based on the output power and / or output current information and the total number of units (total number of devices) of the plurality of AC / DC voltage converters. Alternatively, the operation or non-operation of a plurality of AC / DC voltage converters is determined by an external artificial command.

The description of the management device 2 is based on the description given by the above arbitrary one unit AC / DC voltage converter. The calculation is the same, and the calculation is based on the output power of the AC / DC voltage converter.
There are X AC / DC voltage converters in the power unit PU2 in one rack Rc, and the standard output power per unit of AC / DC voltage converters (may be referred to as a rating) is Y2 (W).

It is assumed that the loads Ld (1) to Ld (n) consume Z2 (W) power as a total amount. (N is an arbitrary integer, 1 or more.) That is, it is assumed that a plurality of loads Ld operate to consume power of Z2 (W).
This is the same as the total output power Z2 (W) output by a plurality of AC / DC voltage converters (including a spare device, but there is no distinction between a spare device and a normal device).

That is, the total demand power (not the maximum. Current demand) of the load group Ld is Z2 (W), and the total supply power capacity P _(max) (W) of the AC / DC voltage converter is P _(max) (W ) = Y2 (W) × X.
Y2 (W) is a standard (rated) output power amount output from the AC / DC voltage converter 1 and X is the number of AC / DC voltage converters. (W) is watts.
However, it is assumed that a plurality of AC / DC voltage converters are supplied with a potential / current sufficient to output P _(max) (W).

The calculation formula for the required number of AC / DC voltage converters is A = INT (Z2 / Y2) + Re + α, with the unit of power (W) watts omitted, where A is the required number of devices. In the INT () operator, values Q and Re obtained by rounding down the quotient of the quotient in the above formula to an integer are remainders (below the quotient decimal point) and take a value of 0 <Re <1.
When Re ≧ predetermined value 1, Re = 1. For example, when Re = 0.8, Re = 1, and when Re <predetermined value 1 and Re = 0.2, the allowance (actual value) of the AC / DC voltage converter is taken into consideration. Thus, Re = 0. The predetermined value 1 is determined by the consumer.
α is the number of spare devices. Since the above calculation is intended for all cross-flow voltage converters, the number of AC / DC voltage converters excluding the number of spare devices is calculated by the formula “INT (Z2 / Y2) + Re”, and the number of spare devices α Is added to the calculation result. The number of spare devices is often one, but depending on the case, a plurality of spare devices may be used. This α is referred to as a predetermined value 2. The predetermined value 1 is determined by the consumer.
This is because such a calculation method does not distinguish between a spare and a normal device. The standby and normal devices operate at the same time, and any current failure does not reduce the current supply to the load group Ld.
The distinction between spares and normal devices need not be recognized by either the system or humans.
From the above equation, the required number A of AC / DC voltage converters is A = Q + Re (= 1 or 0) + α.
Re (= 1 or 0) is a value determined by the predetermined value 1 and is 1 or 0.
In this case, the number of spare devices is included in the calculation of the required number of AC / DC voltage converters.
The spare device is identical to the normal device and operates simultaneously with the normal device. Therefore, there is no normal distinction from spare.
Therefore, the number of operating AC / DC voltage converters is A, and the number of AC / DC voltage converters to be stopped is (X−A). That is, (X-A) AC / DC voltage converters save power, and the A / DC voltage converters operate efficiently.

As described above, the number of operating AC / DC voltage converters in the power unit PU2 is limited to A, and the operating rate of the operating AC / DC voltage converter is increased, thereby supplying power while maintaining the power efficiency of the power unit PU1 to the maximum.
The output power and / or output current management means always monitors the output power and / or output current amount of a plurality of AC / DC voltage converters, and if the output power amount increases, the number of AC / DC voltages B> A. Operate the converter.
If the amount of output power decreases, the number C of AC direct current voltage converters of C <A is operated.

The output power and / or output current management means monitors and manages the output power or output current, output power and output current, and outputs a signal instructing whether to stop or operate the AC / DC voltage converter. Controls the operation of the voltage converter.
If all the AC / DC voltage converters in the power unit PU2 are operated without such control, the output power of each AC / DC voltage converter is small and the voltage conversion efficiency is lowered.

The management device 2 can level the AC / DC voltage conversion device arbitrarily by manual operation without concentrating the operation of the AC / DC voltage conversion device on a specific device.
That is, the MTBF of the AC / DC voltage converter is considered.

The statistics can be analyzed in various ways depending on the collected data, such as the operating rate of the load Ld and the operating rate of the AC / DC voltage converter.

It is also possible to measure the power saving effect.

Cn1, Cn2 Converter C
In2 Inverters Ba1, Ba2 Secondary batteries PU1, PU2 Collective power sources Cov1d to Cov5d, CovXd (+1) DC voltage converters Cov1a to Cov5a, CovXa (+1) AC DC voltage converters Ld (1) to Ld (n) DC load La (1) to La (n) AC load 3φ, 3φ1, 3φ2 Three-phase AC power supply 3φin, 3φ1in, 3φ2in, 3φout AC current path HVDCLi, DCLi DC current path Dscgout, CgDcg DC current path A, C, P, N Terminal BBL1 , BBL2, BBR1, BBR2 Bus bars 1, 2, 3, 4 Terminal Rc, Rc-R Terminal Rect Rectifier Rcir Rectifier circuit UC Individual connector UW Individual wiring

Claims (8)

A plurality of DC voltage converters for inputting a first DC potential and outputting a second DC potential that is lower than the first DC potential;
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
In the plurality of DC voltage converters, optionally having output power and / or output current management means,
Any one unit of the DC voltage converters having the output power and / or output current management means is the second DC potential in the other DC voltage converters from other DC voltage converters other than itself. Provides output power and / or output current information by
The one arbitrary unit includes its own output power and / or output current information based on the second DC potential, output power and / or output current information based on the second DC potential in the other DC voltage converter, and Based on the total number of units of the plurality of DC voltage converters, the operation or non-operation of the plurality of DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, The integer part of the value obtained by dividing the total output power output by the DC voltage converter by the standard supply power per unit of the plurality of DC voltage converters is taken as the quotient, the remainder of the value is the remainder, and the remainder is a predetermined value. When the number is 1 or more, the remainder is 1, and when the remainder is less than the predetermined value 1, the remainder is 0. The value obtained by adding the quotient, the remainder, and the predetermined value 2 is the number of operations of the DC voltage converter. A power supply system characterized by that. A plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential, and a management device 1 having output power and / or output current management means, Prepared,
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
The management device 1 is provided with output power and / or output current information by the second DC potential from the plurality of DC voltage conversion devices,
Based on the output power and / or output current information and the total number of units of the plurality of DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of DC voltages. The operation or non-operation of the converter is determined, and the integer part of the value obtained by dividing the total output power output from the plurality of DC voltage converters by the standard supply power per unit of the plurality of DC voltage converters is taken as the quotient. The remainder of the value is the remainder, the remainder is 1 when the remainder is greater than or equal to the predetermined value 1, the remainder is 0 when the remainder is less than the predetermined value 1, and the quotient, the remainder and the predetermined value 2 are A power supply system characterized in that the added value is the number of operations of the DC voltage converter. A plurality of DC voltage converters for inputting a first DC potential and outputting a second DC potential that is lower than the first DC potential;
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
In the plurality of DC voltage converters, optionally having output power and / or output current management means,
Any one unit of the DC voltage converters having the output power and / or output current management means is the second DC potential in the other DC voltage converters from other DC voltage converters other than itself. Provides output power and / or output current information by
The one arbitrary unit includes its own output power and / or output current information based on the second DC potential, output power and / or output current information based on the second DC potential in the other DC voltage converter, and Based on the total number of units of the plurality of DC voltage converters, the operation or non-operation of the plurality of DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, The integer part of the value obtained by dividing the total output current output by the DC voltage converter by the standard supply current per unit of the plurality of DC voltage converters is a quotient, the remainder of the value is the remainder, and the remainder is a predetermined value. When the number is 1 or more, the remainder is 1, and when the remainder is less than the predetermined value 1, the remainder is 0. The value obtained by adding the quotient, the remainder, and the predetermined value 2 is the number of operations of the DC voltage converter. A power supply system characterized by that. A plurality of DC voltage converters that input a first DC potential and output a second DC potential that is lower than the first DC potential, and a management device 1 having output power and / or output current management means, Prepared,
When the second DC potential is output from the plurality of DC voltage converters, the second DC potential is integrated with the same polarity and substantially the same potential and supplied to the outside.
The management device 1 is provided with output power and / or output current information by the second DC potential from the plurality of DC voltage conversion devices,
Based on the output power and / or output current information and the total number of units of the plurality of DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of DC voltages. The operation or non-operation of the converter is determined, and the integer part of the value obtained by dividing the total output current output from the plurality of DC voltage converters by the standard supply current per unit of the plurality of DC voltage converters is taken as the quotient. The remainder of the value is the remainder, the remainder is 1 when the remainder is greater than or equal to the predetermined value 1, the remainder is 0 when the remainder is less than the predetermined value 1, and the quotient, the remainder and the predetermined value 2 are A power supply system characterized in that the added value is the number of operations of the DC voltage converter. A plurality of AC DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
In the plurality of AC to DC voltage converters, optionally having output power and / or output current management means,
Arbitrary one unit of the AC / DC voltage converters having the output power and / or output current management means is the DC power in the other AC / DC voltage converters from other AC / DC voltage converters other than itself. Provided output power and / or output current information by
The arbitrary unit includes the output power and / or output current information based on the direct current potential of itself, the output power and / or output current information based on the direct current potential in the other alternating current direct current voltage converter, and the plurality of alternating currents. Based on the total number of units of the DC voltage converter, the operation or non-operation of the plurality of AC DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, and the plurality of AC The integer part of the value obtained by dividing the total output power output by the DC voltage converter by the standard supply power per unit of the plurality of AC DC voltage converters is taken as the quotient, the remainder of the value is the remainder, and the remainder is predetermined. the該余when the value 1 or more and 1, 0 and該余when該余is less than the predetermined value 1, the operation speed of the AC-DC voltage converter a value obtained by adding the quotient and該余a predetermined value 2 A power supply system characterized by . A plurality of AC / DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential, and a management device 1 having output power and / or output current management means,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
The management device 1 receives output power and / or output current information based on the DC potential from the plurality of AC / DC voltage converters,
Based on the output power and / or output current information and the total number of units of the plurality of AC / DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of AC An integer of a value obtained by dividing the total output power output from the plurality of AC DC voltage converters by the standard supply power per unit of the plurality of AC DC voltage converters by determining the operation or non-operation of the DC voltage converter The quotient and the remainder of the value as the remainder, the remainder as 1 when the remainder is greater than or equal to the predetermined value 1, and the remainder as 0 when the remainder is less than the predetermined value 1, the quotient and the remainder power supply system, characterized by a value obtained by adding a predetermined value 2 and the operation speed of the AC-DC voltage converter. A plurality of AC DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
In the plurality of AC to DC voltage converters, optionally having output power and / or output current management means,
Arbitrary one unit of the AC / DC voltage converters having the output power and / or output current management means is the DC power in the other AC / DC voltage converters from other AC / DC voltage converters other than itself. Provided output power and / or output current information by
The arbitrary unit includes the output power and / or output current information based on the direct current potential of itself, the output power and / or output current information based on the direct current potential in the other alternating current direct current voltage converter, and the plurality of alternating currents. Based on the total number of units of the DC voltage converter, the operation or non-operation of the plurality of AC DC voltage converters is determined by the output power and / or output current management means of the arbitrary unit, and the plurality of AC The integer part of the value obtained by dividing the total output current output from the DC voltage converter by the standard supply current per unit of the plurality of AC DC voltage converters is taken as the quotient, the remainder of the value is the remainder, and the remainder is predetermined. the該余when the value 1 or more and 1, 0 and該余when該余is less than the predetermined value 1, the operation speed of the AC-DC voltage converter a value obtained by adding the quotient and該余a predetermined value 2 A power supply system characterized by . A plurality of AC / DC voltage converters for inputting an AC potential and outputting a DC potential that is lower than the AC potential, and a management device 1 having output power and / or output current management means,
When the direct current potential is output from the plurality of alternating current direct current voltage converters, the direct current potential is configured to be integrated with substantially the same potential with the same polarity and supplied to the outside.
The management device 1 receives output power and / or output current information based on the DC potential from the plurality of AC / DC voltage converters,
Based on the output power and / or output current information and the total number of units of the plurality of AC / DC voltage converters, the management device 1 uses the output power and / or output current management means possessed by itself to manage the plurality of AC determine the behavior or non-operation of the DC voltage converter, an integer of a value obtained by dividing the standard supply current per unit of the plurality of AC-DC voltage converter plurality of AC-DC voltage converter to the total output current that is output The quotient and the remainder of the value as the remainder, the remainder as 1 when the remainder is greater than or equal to the predetermined value 1, and the remainder as 0 when the remainder is less than the predetermined value 1, the quotient and the remainder power supply system, characterized by a value obtained by adding a predetermined value 2 and the operation speed of the AC-DC voltage converter.

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