JP5377435B2 - Charge control device and charge control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve an inverse power flow to a distribution transformer by charging batteries with a distributed power supply. <P>SOLUTION: The charging control device for controlling the charging of a plurality of batteries connected to a secondary side distribution line of a distribution transformer includes: a charger for charging the batteries with a distributed power supply connected to the distribution line; and a controller for controlling the charger. The controller decides whether or not a current flowing downstream near the secondary side of the distribution transformer in the distribution line is less than a prescribed threshold current. If the current is less than the threshold current, the controller calculates a total necessary charging amount to charge the plurality of batteries based on the difference between the current and the threshold current. Then the controller calculates a target charge amount of the batteries by proportionally dividing the total necessary charging amount by the ratio of a possible charging capacity of the batteries, and controls the charger so that the batteries are charged with the distributed power supply according to the target charge amount. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a charge control device and a charge control method.

As a distributed power source that generates power in the vicinity of a demand area and supplies electric power, for example, a solar power generation system disclosed in Patent Document 1 is known.
The solar power generation system includes a solar battery and an inverter.
For example, the solar cell is connected to a secondary distribution line of a distribution transformer via an inverter. For example, a load such as a factory electric device is connected to the distribution line. The electric power generated by the solar cell is converted from direct current to alternating current by an inverter and supplied to a load.

Japanese Patent Laid-Open No. 10-31525

  In the solar power generation system disclosed in Patent Document 1, when the amount of power generated by the solar cell exceeds the amount of power consumed by the load, the power generated by the solar cell is transferred to the secondary side of the distribution transformer. When supplied, a reverse power flow may occur, which may make it difficult to adjust the voltage of the distribution lines and coordinate protection. In particular, when multiple solar cells are connected to a distribution line, the power generated by the solar cell is frequently supplied to the secondary side of the distribution transformer, making it difficult to adjust the voltage of the distribution line and to coordinate protection. There was a possibility that the possibility of becoming high.

The main present invention for solving the above-mentioned problem is a charge control device for controlling charging of a plurality of batteries connected to a distribution line on the secondary side of a distribution transformer, and is a distributed type connected to the distribution line A charging device for charging each battery by a power source, and determining whether or not a current flowing downstream in the vicinity of the secondary side of the distribution transformer in the distribution line has decreased below a predetermined threshold current, and the current is When the threshold current is decreased, a total required charge amount to be charged to the plurality of batteries is calculated based on a difference between the current and the threshold current, and the total required charge amount is calculated as a possible charge capacity of each battery. And a control device that calculates a target charge amount of each battery in proportion to the ratio, and controls the charging device to charge each battery by the distributed power source according to the target charge amount. A charge control device according to symptoms.
Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, when the current flowing downstream in the vicinity of the secondary side of the distribution transformer is reduced below a predetermined threshold current, each battery is charged by the distributed power source, and the reverse power flow to the distribution transformer is eliminated. It becomes possible to do.

It is a figure which shows the charge control apparatus which concerns on 1st Embodiment and other embodiment of this invention. It is a block diagram which shows the function of the charge control apparatus which concerns on 1st Embodiment and other embodiment of this invention. It is a flowchart which shows operation | movement of the 2nd control apparatus in the charge control apparatus which concerns on 1st Embodiment and other embodiment of this invention. It is a flowchart which shows operation | movement of the 1st control apparatus in the charge control apparatus which concerns on 1st Embodiment and other embodiment of this invention.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

[First embodiment]
=== Power distribution equipment ===
FIG. 1 is a diagram illustrating a charge control device according to the present embodiment.
The power distribution system L100 includes a substation 6 and distribution lines L10 and L20. The substation 6 includes a distribution transformer Tr and a bus L1.

  The primary side of the distribution transformer Tr is connected to a power transmission line (not shown), and the secondary side of the distribution transformer Tr is connected to the bus L1. One ends of the distribution lines L10 and L20 are connected to the bus L1 of the substation 6, respectively. A point where one end of the distribution line L10 is connected to the bus L1 is a point, and a point where one end of the distribution line L20 is connected to the bus L1 is a point b.

  A distributed power source G1 and a load R1 are connected to the distribution line L10, and a distributed power source G2 and a load R2 are connected to the distribution line L20. The distributed power sources G1 and G2 are, for example, a power source provided in a wind power plant or a solar cell installed on the roof of a house, and generate power. The loads R1 and R2 are electric devices provided in, for example, a factory or a house. Power is supplied to the load R1 from the secondary side of the distribution transformer Tr provided in the substation 6 or from the distributed power source G1. Power is supplied to the load R2 from the secondary side of the distribution transformer Tr provided in the substation 6 or from the distributed power source G2.

  For example, battery distribution stations 1 and 2 are provided on the distribution line L10, and the battery exchange station 3 is provided on the distribution line L20.

  The battery exchange station 1 is a facility for exchanging, for example, a battery mounted on an electric vehicle with a battery charged in the battery exchange station 1. The battery exchange stations 2 and 3 are the same facilities as the battery exchange station 1.

  The battery exchange station 1 includes a control device 10 (second control device), a charging device 11, a case 12, and batteries B11 to B16.

  The batteries B <b> 11 to B <b> 16 are batteries that are exchangeably mounted on an electric vehicle (not shown), for example, and are run in the electric vehicle, and are housed in the case 12. The case 12 is connected to the distribution line L10 via the charging device 11 so that the batteries B11 to B16 housed in the case 12 are charged by the power supplied from the secondary side of the distribution transformer Tr or the distributed power source G1. Connected to. The charging device 11 is connected to the control device 10 by, for example, a communication cable T11 so that communication can be performed with the control device 10. Details of the charging device 11 and the control device 10 will be described later.

  Similar to the battery exchange station 1, the battery exchange station 2 includes a control device 20 (second control device), a charging device 21, a case 22, and batteries B21 to B26.

  The batteries B <b> 21 to B <b> 26 are batteries that are exchangeably mounted on an electric vehicle (not shown), for example, and are run in the electric vehicle, and are housed in the case 22. The case 22 is connected to the distribution line L10 via the charging device 21 so that the batteries B21 to B26 housed in the case 22 are charged by the power supplied from the secondary side of the distribution transformer Tr or the distributed power source G1. Connected to. The charging device 21 is connected to the control device 20 by, for example, a communication cable T12 so that communication is performed with the control device 20. The details of the charging device 21 and the control device 20 will be described later.

  Similarly to the battery exchange station 1, the battery exchange station 3 includes a control device 30 (second control device), a charging device 31, a case 32, and batteries B31 to B36.

  The batteries B <b> 31 to B <b> 36 are batteries that are exchangeably mounted on an electric vehicle (not shown), for example, and run in the electric vehicle, and are stored in the case 32. The case 32 is connected to the distribution line L20 via the charging device 31 so that the batteries B31 to B36 housed in the case 32 are charged by the power supplied from the secondary side of the distribution transformer Tr or the distributed power source G2. Connected to. The charging device 31 is connected to the control device 30 by, for example, a communication cable T21 so that communication with the control device 30 is performed. Details of the charging device 31 and the control device 30 will be described later.

=== Overall Configuration of Charge Control Device ===
For example, when the power generated by the distributed power source G1 exceeds the power consumed by the load R1, a reverse power flow occurs in the distribution line L10, and the power generated by the distributed power source G1 is supplied to the second distribution transformer Tr. Supplied to the next side. When a reverse power flow occurs in the distribution line L10, the current (hereinafter referred to as current I1) flowing downstream in the vicinity of the point a of the distribution line L10 is 0 or less. Here, the threshold current It1 is set to a value somewhat larger than 0 so that a reverse power flow does not occur in the distribution line L10. When a reverse power flow occurs in the distribution line L20 as in the distribution line L10, the current flowing in the vicinity of the point b of the distribution line L20 downstream (hereinafter referred to as current I2) is 0 or less. Here, the threshold current It2 is set to a value somewhat larger than 0 so that a reverse power flow does not occur in the distribution line L20.

  When the current I1 decreases from a predetermined threshold current It1, the charge control device 8 charges the batteries B11 to B16 and the batteries B21 to B26 with the distributed power source G1 so that no reverse power flow occurs in the distribution line L10. In addition, when the current I2 decreases from a predetermined threshold current It2, the charging control device 8 charges the batteries B31 to B36 with the distributed power source G2 so that no reverse power flow occurs in the distribution line L20.

  The charging control device 8 includes charging devices 11, 21, 31, control devices 10, 20, 30 (second control device) and a control device 60 (first control device).

  The control device 60 is provided, for example, in the substation 6 and is connected to the control devices 10 to 30 via, for example, the communication network N so as to be able to communicate with the control devices 10 to 30.

  Here, the measuring device 61 is provided in the vicinity of the point a in the distribution line L10, and the measuring device 62 is provided in the vicinity of the point b in the distribution line L20. The measuring devices 61 and 62 are, for example, transformers. The measuring device 61 measures the voltage and current I1 at the point where the measuring device 61 in the distribution line L10 is provided. The measuring device 62 measures the voltage and current I2 at the point where the measuring device 62 is provided in the distribution line L20. Information indicating the voltage value and current value measured by the measuring device 61 is referred to as measurement information M1, and information indicating the voltage value and current value measured by the measuring device 62 is referred to as measurement information M2.

  The control device 60 is connected to the measurement devices 61 and 62 via, for example, the communication cable T0 so that the control device 60 can communicate with the measurement devices 61 and 62. The control device 60 determines whether or not the currents I1 and I2 are smaller than the threshold currents It1 and It2 based on the measurement information M1 and M2 received from the measurement devices 61 and 62. When I1 is smaller than the threshold current It1, the control device 60 transmits a control command for charging the batteries B11 to B16 and B21 to B26 to the control devices 10 and 20. When I2 is smaller than the threshold current It2, the control device 60 transmits a control command for charging the batteries B31 to B36 to the control device 30.

=== Charging device ===
Since the charging devices 11, 21, and 31 have the same configuration, only the charging device 11 will be described, and description of the charging devices 21, 31 will be omitted.

  The charging device 11 charges the batteries B11 to B16 with the power generated by the distributed power supply G1 or the power supplied from the secondary side of the distribution transformer Tr.

  The charging device 11 includes switches (not shown) that open and close between the batteries B11 to B16 and the distribution line L10, and an inverter (not shown) that converts alternating current into direct current.

  The switch and the inverter are provided in association with each of the batteries B11 to B16. Each battery B11 thru | or B16 is connected to the direct current | flow side of each inverter matched with each battery B11 thru | or B16. The AC side of each inverter associated with each battery B11 to B16 is connected to the distribution line L10 via each switch associated with each battery B11 to B16. For example, when the current I1 decreases from a predetermined threshold current It1, the switch associated with the battery B11 is closed and the switches associated with the batteries B12 to B16 are opened. Battery B11 is charged with electric power converted from alternating current to direct current by an inverter associated with battery B11. On the other hand, the batteries B12 to B16 are disconnected from the distributed power source G1, and the power generated by the distributed power source G1 is not supplied to the batteries B12 to B16. The charging of the batteries B12 to B16 is the same as the charging of the battery B11, and the description thereof is omitted.

  Here, the charging device 11 includes, for example, a charging switch (not shown) for the operator to control charging of the batteries B11 to B16 in the battery exchange station, for example. For example, when an operator turns on the charging switch, each switch associated with each battery B11 to B16 is closed, and each battery B11 to B16 is, for example, power supplied from the secondary side of the distribution transformer Tr. Is charged. It is assumed that the charging switch can be turned on only when the charging device is in the manual operation mode. The manual operation mode will be described later.

=== Control devices 10, 20, 30 (second control device) ===
FIG. 2 is a block diagram illustrating functions of the charge control device according to the present embodiment.
FIG. 3 is a flowchart showing the operation of the second control device in the charge control device according to the present embodiment.

  Since the control devices 10, 20, and 30 are similarly configured, only the control device 10 will be described, and description of the control devices 20 and 30 will be omitted.

The control device 10 controls the charging device 11 based on the charging command transmitted from the control device 60 so that the batteries B11 to B16 are charged.
The control device 10 includes a transmission / reception unit 101, a calculation unit 102, and a storage unit 103.

The transmission / reception unit 101 communicates with the control device 60 via the communication network N, for example.
When the transmission / reception unit 101 receives a possible charge amount confirmation command from the control device 60, the calculation unit 102 calculates a possible charge amount indicating power that can be charged to each of the batteries B11 to B16. The possible charge amount of each battery B11 to B16 is, for example, the voltage of the output terminal (not shown) of each battery B11 to B16 (hereinafter referred to as output voltage) and the output voltage when all of the batteries B11 to B16 are charged (hereinafter referred to as It is calculated based on the difference of the maximum output voltage. The details of the possible charge amount will be described later.

  Here, voltmeters (not shown) for measuring the output voltages of the batteries B11 to B16 are connected to the output terminals of the batteries B11 to B16. For example, when the battery B11 is replaced with a battery used in an electric vehicle, the output voltage of the battery B11 is lower than the maximum output voltage of the battery B11. For example, when each battery B12 to B16 is replaced with a battery mounted on an electric vehicle, the output voltage of each battery B12 to B16 is lower than the maximum output voltage of each battery B12 to B16.

  The control device 10 can receive the output voltage values of the batteries B11 to B16 from the voltmeters connected to the output terminals of the batteries B11 to B16, for example, via the communication cables (not shown). Connected to the voltmeter connected to the output terminal.

  The storage unit 103 includes, for example, a first area 104 and a second area 105.

  The first area 104 stores a program for controlling the charging device 11 and the voltmeters connected to the output terminals of the batteries B11 to B16. The second area 105 stores the output voltage value of each battery B11 to B16 and the maximum output voltage value of each battery B11 to B16 measured by a voltmeter connected to the output terminal of each battery B11 to B16. . It is assumed that the batteries B11 to B16 have the same capacity for convenience of explanation, and the maximum output voltage values of the batteries B11 to B16 are stored in the second area 105.

  For example, when the control device 10 receives a charging command from the control device 60, the control device 10 controls the charging device 11 so that the batteries B11 to B16 are charged. For example, when charging the battery B11 based on the charging command transmitted from the control device 60, the control device 10 is associated with each of the batteries B12 to B16 by closing the switch associated with the battery B11 of the charging device 11. The charging device 11 is controlled so that the switch is opened. The electric power is converted from alternating current to direct current by an inverter associated with the battery B11 via a switch associated with the battery B11. Battery B11 is charged with electric power converted from alternating current to direct current by an inverter associated with battery B11.

  For example, when the control device 10 receives a possible charge amount confirmation command from the control device 60, the control device 10 calculates the possible charge amount of each of the batteries B <b> 11 to B <b> 16 and transmits the calculation result to the control device 60. When the control device 10 receives the possible charge amount confirmation command from the control device 60, the control device 10 receives the output voltage value of each of the batteries B11 to B16 from the voltmeter connected to the output terminal of each of the batteries B11 to B16. It memorize | stores in the area | region 105 (step S21). The computing unit 102 can charge each of the batteries B11 to B16 based on the difference between the output voltage value of each of the batteries B11 to B16 stored in the second area 105 and the maximum output voltage value of each of the batteries B11 to B16. A possible charge amount indicating electric power is calculated (step S22). The control device 10 transmits possible charge amount information indicating the possible charge amount of each of the batteries B11 to B16 to the control device 60 (step S23).

=== Control Device 60 (First Control Device) ===
Hereinafter, the control device 60 used in the present embodiment will be described with reference to FIGS. 1 and 2.

  The control device 60 determines whether or not the currents I1 and I2 are smaller than the threshold currents It1 and It2 based on the measurement information M1 and M2 received from the measurement devices 61 and 62. When the current I1 is smaller than the threshold current It1, the control device 60 transmits a charging command to the control devices 10 and 20 so that the batteries B11 to B16 and B21 to B26 are charged. When the current I2 is smaller than the threshold current It2, the control device 60 transmits a charging command to the control device 30 so that the batteries B31 to B36 are charged.

  The control device 60 includes a transmission / reception unit 601, a calculation unit 602, and a storage unit 603.

  The transmission / reception unit 601 communicates with the measurement devices 61 and 62 via, for example, the communication cable T0, and communicates with the control devices 10, 20, and 30 via, for example, the communication network N.

  The calculation unit 602 determines whether or not the currents I1 and I2 are smaller than the threshold currents It1 and It2 based on the measurement information M1 and M2.

  When the current I1 is smaller than the threshold current It1, the calculation unit 602 indicates the total required charge amount indicating the power to be charged in the batteries B11 to B16 and the batteries B21 to B26 based on the difference between the current I1 and the threshold current It1 ( Hereinafter, the total required charge amount of the distribution line L10) is calculated. The calculation unit 602 calculates the target charge amounts of the batteries B11 to B16 and the batteries B21 to B26 based on the total required charge amount of the distribution line L10 and the possible charge amounts of the batteries B11 to B16 and the batteries B21 to B26. To do.

  When the current I2 is smaller than the threshold current It2, the calculation unit 602 calculates the total required charge amount (hereinafter, the distribution line L20) indicating the power to be charged in the batteries B31 to B36 based on the difference between the current I2 and the threshold current It2. Is calculated). The calculation unit 602 calculates the target charge amount of each of the batteries B31 to B36 based on the total required charge amount of the distribution line L20 and the possible charge amount of each of the batteries B31 to B36.

The storage unit 603 includes, for example, a first area 604 to a fourth area 607.
In the first area 604, programs for controlling the measuring devices 61 and 62 and the control devices 10, 20, and 30 are stored.
In the second area 605, the currents I1 and I2 shown in the measurement information M1 and M2 received from the measurement devices 61 and 62, the voltage at the point where the measurement device 61 in the distribution line L10 is provided, and the measurement in the distribution line L20. The voltage at the point where the device 62 is provided is stored.
In the third area 606, threshold currents It1, It2 are stored.

  Here, the control device 60 is provided with, for example, a keyboard (not shown) for an operator to input the threshold currents It1, It2 and store them in the third area 606, for example. As described above, the threshold current It1 is a value somewhat larger than 0 so that a reverse power flow does not occur in the distribution line L10, and is input from a keyboard, for example. As described above, the threshold current It2 is a value somewhat larger than 0 so that a reverse power flow does not occur in the distribution line L20. For example, the threshold current It2 is input from a keyboard.

  The fourth area 607 stores the possible charge amount and the target charge amount of each of the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36.

=== Operation of Charge Control Device ===
FIG. 4 is a flowchart showing the operation of the first control device in the charge control device 8 according to the present embodiment.

  Hereinafter, the operation of the charging control device 8 according to the present embodiment will be described with reference to FIGS. 1 to 4. In addition, since the operation | movement which the charging control apparatus 8 does not generate | occur | produce the reverse power flow of the distribution line L10 and the operation | movement which the charging control apparatus 8 does not generate the reverse power flow of the distribution line L20 are the same, the charging control apparatus 8 However, the operation for preventing the reverse flow of the distribution line L10 from occurring will be described, and the description of the operation for the charge control device 8 to prevent the reverse flow of the distribution line L20 from occurring will be omitted.

  A description will be given from the start of execution of the program stored in the first area 604 of the control device 60.

  When the threshold current It1 is input from, for example, a keyboard provided in the control device 60 by an operator, for example, the control device 60 stores the threshold current It1 in the third region 606 (step S11).

  The control device 60 transmits a measurement command for receiving the measurement information M <b> 1 from the measurement device 61 to the measurement device 61. The control device 60 receives the measurement information M1 from the measurement device 61. The control device 60 stores the current I1 indicated by the measurement information M1 and the voltage at the point where the measurement device 61 in the distribution line L10 is provided in the second region 605 (step S12).

  The control device 60 determines whether or not the current I1 stored in the second area 605 is smaller than the threshold current It1 stored in the third area 606 (step S13).

  When the current I1 is not decreasing below the threshold current It1 (NO in step S13), the control device 60 controls the charging devices 11 and 21 to enter the manual operation mode. The charging devices 11 and 21 are put into a manual operation mode by the control devices 10 and 20, respectively. For example, when an operator turns on a charging switch for charging the battery B16, the battery B16 is charged. The control device 60 cancels the manual operation mode of the charging devices 11 and 21, performs the control in step S12, and then performs the determination in step S13 again.

  On the other hand, when the current I1 is smaller than the threshold current It1 (YES in step S13), the control device 60 performs control so that the batteries B11 to B16 and the batteries B21 to B26 are charged as described later.

  The control device 60 calculates the total required charge amount of the distribution line L10 based on the difference between the current I1 and the threshold current It1. The control device 60 is provided with the measuring device 61 in the distribution line L10 stored in the second region 605 in the difference between the current I1 stored in the second region 605 and the threshold current It1 stored in the third region 606. The total required charge amount of the distribution line L10 is calculated by multiplying the voltage at the given point (step S14).

  The control device 60 checks the possible charge amounts of the batteries B11 to B16 and the batteries B21 to B26. In addition, since the possible charge amount of each battery B21 thru | or B26 is confirmed similarly to the possible charge amount of each battery B11 thru | or B16, the description is abbreviate | omitted.

  The control device 60 transmits a possible charge amount confirmation command to the control device 10. When the control device 10 receives the possible charge amount confirmation command, execution of the program stored in the first area 104 of the control device 10 is started. The control apparatus 10 receives the output voltage value of each battery B11 to B16 from the voltmeter connected to the output terminal of each battery B11 to B16, and stores it in the second area 105 (step S21). The control device 10 can charge each of the batteries B11 to B16 based on the difference between the output voltage value of each of the batteries B11 to B16 stored in the second area 105 and the maximum output voltage value of each of the batteries B11 to B16. A possible charge amount indicating electric power is calculated (step S22). The control device 10 transmits possible charge amount information indicating the possible charge amount of each of the batteries B11 to B16 to the control device 60 (step S23).

  The control device 60 stores the possible charge amount of each of the batteries B11 to B16 indicated in the possible charge amount information received from the control device 10 in the fourth area 607 (step S15).

The control device 60 calculates target charge amounts of the batteries B11 to B16 and the batteries B21 to B26. The control device 60 calculates the target charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26 based on the total required charge amount of the distribution line L10 and the possible charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26. . For example, the control device 60 apportions the total required charge amount of the distribution line L10 by the ratio of the possible charge amounts of the batteries B11 to B16 and the batteries B21 to B26, and targets the batteries B11 to B16 and the batteries B21 to B26. Charge amount. When the target charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26 is equal to or greater than the possible charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26, the control device 60, for example, The possible charge amounts of B21 to B26 are set as target charge amounts of the batteries B11 to B16 and the batteries B21 to B26. The control device 60 stores the target charge amounts of the batteries B11 to B16 and the batteries B21 to B26 in the fourth area 607 (step S16).
The control device 60 transmits a charge command for charging only the battery B11, for example, to the control device 10 based on the target charge amount of each of the batteries B11 to B16. The control device 60 transmits, for example, a charge command for charging the batteries B21 and B22 to the control device 20 based on the target charge amount of each of the batteries B21 to B26.

  For example, the control device 10 receives a charging command for charging the battery B11 from the control device 60, and controls the charging device 11 so that the battery B11 is charged. The control device 10 controls the charging device 11 such that the switch associated with the battery B11 of the charging device 11 is closed and the switches associated with the batteries B12 to B16 are opened. The electric power is converted from alternating current to direct current by an inverter associated with the battery B11 via a switch associated with the battery B11, and the battery B11 is charged. For example, the control device 20 receives a charging command for charging the batteries B21 and B22 from the control device 60, and controls the charging device 21 so that the batteries B21 and B22 are charged. The control device 20 controls the charging device 21 so that the switches associated with the batteries B21 and B22 of the charging device 21 are closed and the switches associated with the batteries B23 to B26 are opened. The electric power is converted from alternating current to direct current by an inverter associated with the batteries B21 and B22 via a switch associated with the batteries B21 and B22, and charged to the batteries B21 and B22 (step S17).

  After performing the control in step S12, the control device 60 performs the determination in step S13 again.

[Other embodiments]
The charging control device 8 according to the first embodiment charges the power generated by the distributed power sources G1 and G2 to the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36, thereby distributing the power line L10. Although the reverse power flow that makes voltage adjustment and protection coordination of L20 difficult is prevented from occurring, for example, voltage adjustment and protection coordination of distribution lines L10 and L20 become difficult by using a power adjustment load (not shown) together. A reverse power flow may not be generated.

  The power adjustment load is, for example, a water heater that consumes the power generated by the distributed power sources G1 and G2. The power adjustment load is connected to the distribution line L10 via a switching device (not shown). In addition, since the power adjustment load connected to the distribution line L20 is connected similarly to the power adjustment load connected to the distribution line L10, description thereof is omitted.

  The switching device includes a switch (not shown) that opens and closes between the power adjustment load and the distribution line L10. Here, it is assumed that the control device 60 transmits an opening / closing command for controlling opening / closing of the switch in the switching device to the switching device. The switching device is connected to the control device 60 via, for example, a communication cable (not shown) so that an opening / closing command can be received from the control device 60. For example, when the switching device receives an opening / closing command for closing between the power adjustment load and the distribution line L10 from the control device 60, the switch of the switching device is closed and the power generated by the distributed power source G1 is the power adjustment load. Is consumed. On the other hand, for example, when the switching device receives an opening / closing command to open between the power adjustment load and the distribution line L10 from the control device 60, the switch of the switching device is opened and the power generated by the distributed power source G1 is adjusted. Not consumed with load.

  For example, when the current I1 is smaller than the threshold current It1, the control device 60 calculates the total required charge amount of the distribution line L10, the target charge amounts of the batteries B11 to B16, and the batteries B21 to B26, and Control is performed so that the batteries B11 to B16 and the batteries B21 to B26 are charged.

  For example, when the total required charge amount of the distribution line L10 exceeds the sum of the target charge amounts of the batteries B11 to B16 and the batteries B21 to B26, the control device 60 opens and closes between the power adjustment load and the distribution line L10. Send the command to the switching device. The electric power generated by the distributed power source G1 that is not charged to the batteries B11 to B16 and the batteries B21 to B26 is supplied to the power adjustment load via the switching device and consumed. Therefore, even when the total required charge amount of the distribution line L10 exceeds the sum of the target charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26, reverse power flow does not occur in the distribution line L10 by using the power adjustment load together. Can be. The operation in which the charging control device 8 prevents the reverse flow of the distribution line L20 from occurring using the power adjustment load is performed so that the charging control device 8 does not generate the reverse flow of the distribution line L10 using the power adjustment load. Since this is the same as the operation to be performed, the description thereof is omitted.

  As described above, the control device 60 determines whether or not the currents I1 and I2 are smaller than the threshold currents It1 and It2. When the current I1 is smaller than the threshold current It1, the control device 60 determines the total required charge calculated based on the difference between the current I1 and the threshold current It1 for each of the batteries B11 to B16 and each of the batteries B21 to B26. A target charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26 that are prorated according to the charge amount ratio is calculated. The control device 10 controls the charging devices 11 and 12 so that the batteries B11 to B16 and the batteries B21 to B26 are charged according to the target charge amounts of the batteries B11 to B16 and the batteries B21 to B26. The charging devices 11 and 12 charge the batteries B11 to B16 and the batteries B21 to B26 by closing the switches of the charging devices 11 and 12, respectively. When the current I2 is decreased from the threshold current It2, the batteries B31 to B36 are charged in the same manner as when the current I1 is decreased from the threshold current It1. Thus, the charging control device 8 can prevent the reverse power flow from occurring in the power distribution system L100 and prevent the voltage adjustment and protection coordination of the distribution lines L10 and L20 from becoming difficult due to the reverse power flow.

  When the target charge amount of each of the batteries B11 to B16, each of the batteries B21 to B26 and each of the batteries B31 to B36 is equal to or larger than the possible charge amount, the control device 60 The possible charge amount from B31 to B36 is set as the target charge amount. Therefore, the charging control device 8 controls the charging devices 11, 21, and 31 so that the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 are charged to a chargeable amount or less.

  Further, the control device 60 and the control devices 10, 20, 30 are connected via a communication network N. Therefore, the control device 60 is controlled via the communication network N so that the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 are charged by the power generated by the distributed power sources G1 and G2. 10, 20, 30 can be controlled. Therefore, for example, since a plurality of batteries provided in a remote place can be controlled from the control device 60, the charge control device 8 controls the power distribution system L100 so that no reverse power flow occurs, It is possible to prevent the voltage adjustment and protection coordination of the distribution lines L10 and L20 from becoming difficult due to the reverse power flow.

  Further, the control device 60 determines each of the batteries B11 to B16 and each of the batteries B21 to B16 based on the possible charge amounts of the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 stored in the fourth area 607. B26 and target charge amounts of the batteries B31 to B36 are calculated. The control device 60 quickly calculates the target charge amount of each of the batteries B11 to B16, each of the batteries B21 to B26, and each of the batteries B31 to B36 without performing communication with the control devices 10, 20, and 30. Accordingly, the charging control device 8 can quickly control the reverse power flow so as not to occur in the power distribution system L100, and prevents the voltage adjustment and protection coordination of the distribution lines L10 and L20 from becoming difficult due to the reverse power flow. Can do.

  Further, as the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36, for example, batteries that are exchangeably mounted on an electric vehicle and run the electric vehicle are used. The batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 are charged by the distributed power sources G1 and G2. Therefore, the charging control device 8 can effectively use the power generated by the distributed power sources G1 and G2 that eliminates the reverse power flow generated in the power distribution system L100 and causes the reverse power flow generated in the power distribution system L100.

  Further, when no reverse power flow is generated in the distribution system L100, the charging control device 8 supplies the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 from the secondary side of the distribution transformer Tr. Can be charged with. Therefore, the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 can all be charged before the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 are mounted on an electric vehicle, for example.

  Further, it is determined whether or not the currents I1 and I2 are smaller than the threshold currents It1 and It2, and when the current I1 is smaller than the threshold current It1, it is calculated based on the difference between the current I1 and the threshold current It1. A target charge amount of each of the batteries B11 to B16 and each of the batteries B21 to B26 is calculated by dividing the total required charge amount by a ratio of the possible charge amounts of the respective batteries B11 to B16 and each of the batteries B21 to B26. And each battery B11 thru | or B16 and each battery B21 thru | or B26 are charged according to the target charge amount of each battery B11 thru | or B16 and each battery B21 thru | or B26. Further, when the current I2 is smaller than the threshold current It2, the batteries B31 to B36 are charged in the same manner as when the current I1 is smaller than the threshold current It1. Therefore, it is possible to prevent the reverse power flow from occurring in the power distribution system L100 and to prevent the voltage adjustment and protection coordination of the distribution lines L10 and L20 from becoming difficult due to the reverse power flow.

  In addition, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  The batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 in the first embodiment and the other embodiments are assumed to have the same capacity for convenience of explanation, but are not limited thereto. is not. For example, the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36 may be different batteries having different capacities. In that case, for example, an operator may input the maximum output voltage values of the batteries B11 to B16, the batteries B21 to B26, and the batteries B31 to B36.

1, 2, 3 Battery exchange station 6 Substation 8 Charging control device 10, 20, 30, 60 Control device 11, 21, 31 Charging device 12, 22, 32 Case 61, 62 Measuring device B11, B12, B13, B14, B15, B16, B21, B22, B23, B24, B25, B26, B31, B32, B33, B34, B35, B36 Battery G1, G2 Distributed power supply L1 Bus L10, L20 Distribution line L100 Distribution system R1, R2 Load Tr Distribution Transformer N Communication network

Claims (7)

A charge control device that controls charging of a plurality of batteries connected to a distribution line on the secondary side of a distribution transformer,
A charging device for charging each of the batteries with a distributed power source connected to the distribution line;
It is determined whether or not the current flowing downstream in the vicinity of the secondary side of the distribution transformer in the distribution line has decreased from a predetermined threshold current, and when the current has decreased from the threshold current, the current and the A total required charge amount to be charged to the plurality of batteries is calculated based on a difference between threshold currents, and the total required charge amount is divided by a ratio of possible charge capacities of the respective batteries to obtain a target charge amount of each of the batteries. A control device for controlling the charging device to charge each battery by the distributed power source according to the target charge amount;
A charge control device comprising: The controller is
When the target charge amount of each battery is less than the possible charge amount of each battery, the charging device is controlled so that the charge amount of each battery becomes the target charge amount of each battery,
When the target charge amount of each battery is equal to or greater than the possible charge amount of each battery, the charging device is controlled such that the charge amount of each battery becomes the possible charge amount of each battery;
The charge control device according to claim 1, wherein: The controller is
A first control device that determines whether or not the current has decreased from the threshold current, and calculates the total required charge amount and the target charge amount when the current has decreased from the threshold current;
A second control device for controlling the charging device to charge each of the batteries by the distributed power source according to the target charge amount;
With
The first control device and the second control device are connected via a network;
The charge control device according to claim 1 or 2, characterized by the above-mentioned. The first control device includes:
A storage unit that stores information indicating a possible charge capacity of each of the batteries received from the second control device via the network;
Calculating a target charge amount of each battery based on information indicating a possible charge capacity of each battery read from the storage unit;
The charge control device according to claim 3. The plurality of batteries are:
A battery that is replaceably mounted on the vehicle to run the vehicle, and is disposed at a battery exchange station for exchanging the batteries.
The second control device includes:
Controlling the charging device to charge each of the batteries arranged in the battery exchange station by the distributed power source according to the target charge amount;
The charge control device according to claim 3 or 4, characterized by the above. Each battery is
If the current is not reduced below the threshold current, being charged with power supplied to the distribution line from the secondary side of the distribution transformer,
The charge control device according to claim 1, wherein: A charge control method for controlling charging of a plurality of batteries connected to a distribution line on the secondary side of a distribution transformer,
It is determined whether or not the current flowing downstream in the vicinity of the secondary side of the distribution transformer in the distribution line has decreased from a predetermined threshold current, and when the current has decreased from the threshold current, the current and the A total required charge amount to be charged to the plurality of batteries is calculated based on a difference between threshold currents, and the total required charge amount is divided by a ratio of possible charge capacities of the respective batteries to obtain a target charge amount of each of the batteries. And charging each battery with a distributed power source connected to the distribution line according to the target charge amount,
A charge control method characterized by the above.

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