JP7180633B2 - Recovery operation method from power failure and recovery operation device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an operation method and an operation device for quickly recovering from a power failure in a power supply target facility such as an ironworks.

For example, the method disclosed in Patent Document 1 is known as an operation method for quickly recovering from a power failure in the event of a total power failure in the power supply target facility. , Considering the presence or absence of a single thermal power generator that is not electrically connected to the upper system bus in the sound equipment in the power system of the power supply target facility, if there is a single thermal power generator, By electrically connecting to the system bus, a new restoration target system with increased support power is obtained.

JP-A-06-205536

However, in the case of this conventional operation method, since it is not possible to grasp the status of the factory load such as the hot rolling mill in the electric power system of the power supply target facility such as the steel mill, it is possible to restore the power supply too early by mistake. There is a possibility that the accompanying voltage fluctuations will increase and cause problems with the power quality of the power system, and in some cases, the excessive voltage fluctuations may lead to insulation breakdown of load equipment, etc., and secondary disasters may occur due to damage to equipment. is also of concern.

Therefore, an object of the present invention is to enable early recovery from a power outage while maintaining power quality according to the state and characteristics of the power system, taking into consideration the load characteristics and the voltage adjustment function of the private power generator that pose problems in terms of power quality. The object of the present invention is to propose a restoration operation method and a restoration operation device.

The recovery operation method from a power failure of the present invention, which advantageously solves the above problems, comprises:
In normal times, when the power system of the power supply target facility, in which a private generator is connected to the power company's main system to supply power to multiple factory loads, during a total power failure of the power system,
Suppressing voltage fluctuations in the power system of the power supply target facility according to characteristics such as voltage fluctuations of the factory load due to arrangement and connection in the power system of the power supply target facility, and the operation status and startability status of the private power generator. It is characterized by performing an automatic recovery operation as follows.

In addition, in the recovery operation method from a power failure of the present invention, the power system of the power supply target facility is completely restored by the high-level bus line connecting the primary side of the high-level transformer equipment to the main system of the electric power company. In the event of a power outage,
First, as a full power outage release operation, the secondary side circuit breaker of the upper substation equipment, the secondary side circuit breaker of the lower substation equipment whose primary side is connected to the secondary side of the higher substation equipment, A circuit breaker for the transmission line of the private power generator to the secondary side of the substation equipment or to the subordinate busbar connected to the secondary side of the substation equipment, and cut off the distribution line for each factory load from the substation busbar. Automatically open the device,
Then, after waiting for the restoration of the main system of the electric power company, while monitoring the voltages of the upper and lower bus lines and the power flow flowing through each circuit breaker, It is preferable to perform an automatic restoration operation of the electric power system of the power supply target facility by automatically turning on each of the circuit breakers downward.

Further, in the recovery operation method from a power failure of the present invention, since the recovery of the private power generator contributes to the suppression of voltage fluctuations in the power system of the power supply target facility when the factory loads are connected, the plurality of Among the factory loads, it is preferable to preferentially perform the automatic restoration operation of the factory load that generates by-product gas, which is the fuel necessary for restoration of the private power generator.

Further, in the recovery operation method from a power failure of the present invention, in the recovery operation of the private power generator,
First, perform the restoration operation of the auxiliary equipment necessary for starting the private generator,
It is preferable to start and restore the private power generator after the auxiliary equipment has been restored and ready for start-up.

Furthermore, in the recovery operation method from a power failure of the present invention, when recovering the plurality of factory loads,
It is preferable that the recovery operation is performed so as to suppress the voltage fluctuation of the electric power system of the power supply target facility according to the voltage fluctuation due to the connection of each factory load and the voltage adjustment function of the private power generator.

Furthermore, in the recovery operation method from a power failure of the present invention, voltage fluctuations in the electric power system of the power supply target facility are suppressed in advance according to the characteristics of each factory load and the operating status and startability status of the private power generator. It is preferable that the recovery operation of the private power generator and the plurality of factory loads is performed according to a recovery order table that defines the recovery order of the private power generator and the factory load.

Further, the recovery operation device from a power failure of the present invention, which advantageously solves the above problems,
A recovery operation device for automatically recovering from a total power failure in the event of a total power failure in the power system of a power supply target facility in which a private generator is normally connected to the power company's main system to supply power to a plurality of factory loads,
a system information input unit for inputting information indicating the current state of the power system of the power supply target facility, including the operation status and startability status of the private power generator;
Prioritizing a factory load that generates a by-product gas that is a fuel necessary for restoration of the private power generator among the plurality of factory loads, and suppressing voltage fluctuations in the power system of the power supply target facility. and a recovery order setting unit that sets a recovery order table that defines the recovery order of the plurality of factory loads;
a recovery order changing unit that changes the recovery order of the private power generator and the plurality of factory loads read from the recovery order table so as to suppress voltage fluctuations in the power system based on the current state of the power system;
Based on the recovery order of the private power generator and the plurality of factory loads read from the restoration order table, it is determined that there is no problem in power quality, and the power transmission line of the private power generator and the distribution line for each factory load a control signal output unit that outputs a switching control signal to the circuit breaker of
It is characterized by comprising

According to the recovery operation method from a power failure of the present invention, in the event of a total power failure in the power system of a power supply target facility in which a private generator is normally connected to the power company system to supply power to a plurality of factory loads, the total power failure occurs. When automatically recovering from the power supply target facility, the power supply target facility power Since automatic recovery operations are performed to suppress voltage fluctuations in the grid, early recovery from power outages must be performed while maintaining power quality, taking into consideration the load characteristics that pose problems in terms of power quality and the voltage adjustment function of private power generators. can be done.

In addition, according to the power failure recovery operation device of the present invention, the system information input unit inputs information indicating the current state of the power system of the power supply target facility, including the operation status and startability status of the private power generator. a recovery order setting unit that sets a recovery order table that defines the recovery order of the private generator and the plurality of factory loads so as to suppress voltage fluctuations in the power system of the power supply target facility; a control signal output unit for changing the restoration order of the private power generator and the plurality of factory loads read from the restoration order table so as to suppress voltage fluctuations in the power system based on the current state of the power system; outputs a switching control signal to the circuit breaker of the transmission line of the private power generator and the distribution line for each of the factory loads based on the recovery order of the private power generator and the plurality of factory loads read from the restoration order table. Therefore, it is possible to quickly recover from a power failure while maintaining power quality, taking into consideration the load characteristics and the voltage adjustment function of the in-house power generator that pose problems in terms of power quality.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the structure of the recovery operation apparatus from the power failure of one Embodiment of this invention. It is a flowchart which shows the first half part of the operation procedure of the recovery operation method from the power failure of one Embodiment of this invention which the recovery operation apparatus from the power failure of the said embodiment performs. It is a flowchart which shows the latter half part of the operation procedure of the recovery operation method from the power failure of one Embodiment of this invention which the recovery operation apparatus from the said embodiment performs. FIG. 10 is an explanatory diagram showing a normal state of the power system of the facility to be supplied with power to which the restoration operation device and the restoration operation method of the embodiment perform the restoration operation. FIG. 4 is an explanatory diagram showing a state of independent maintenance of the power system of the power supply target facility when the power company stops the interconnection. FIG. 4 is an explanatory diagram showing the state of the power system of the power supply target facilities at the time of total blackout after interconnection stop from the electric power company and failure of independent system maintenance, and a recovery order table of private generators and factory loads. An explanatory diagram showing the initial state and the order of restoration of private power generators and factory loads in the recovery operation after the total power outage of the power system of the above power supply target facility, with the interconnection restoration from the electric power company and the private power generator not restored. is. FIG. 10 is an explanatory diagram showing a state at the time of closing the secondary side circuit breaker of the upper transforming equipment by the restoration operation (Case 1) and a restoration order table of the private generator and the factory load after the restoration operation. FIG. 10 is an explanatory diagram showing a state of all factory loads after the circuit breaker is turned on by the restoration operation (Case 1) and a restoration order list of the private power generator and the factory load after the restoration operation. After the restoration operation shown in Fig. 7 above, the state of partial restoration of the factory load after the circuit breaker is turned on by the restoration operation (case 2) and the restoration order table in which the restoration priority of the private generator and the factory load are exchanged. It is an explanatory diagram showing. In the above recovery operation (Case 2), it is an explanatory diagram showing a recovery order table in which the state at the time of turning on the circuit breaker when the private power generator 1 becomes startable and the recovery priority of the private power generator and the factory load are exchanged. be. In the above recovery operation (Case 2), the state of private power generator 1 and the factory load after the circuit breaker is turned on by the recovery operation, and the recovery order table in which the recovery priority of the private power generator and the factory load are replaced. It is an explanatory diagram showing. FIG. 10 is an explanatory diagram showing a state after all restoration of the private power generator 1 and the factory load and a restoration order table of the private power generator and the factory load in the restoration operation (Case 2);

FIG. 1 is a block diagram showing the configuration of a power failure recovery operation device according to one embodiment of the present invention. In the event of a total blackout of the power supply system of a facility to be supplied with power, such as a steel mill, for example, a steel mill or other facility that supplies power to a plurality of factory loads such as a hot strip mill by interconnecting equipment, a recovery operation is performed when automatically recovering from the total blackout. be.

The operation device for recovery from a power failure of this embodiment includes the current status of the electric power system of the power supply target facility, including the power flow flowing through each circuit breaker and the bus voltage in addition to the operation (operating) status and startability status of the private power generator. A system information input unit 1 for inputting system information indicating a state, a system information display unit 2 for displaying the system information input by the system information input unit 1 on a screen, and suppressing voltage fluctuations in the power system of the power supply target facility. a recovery order setting unit 3 for setting a recovery order table defining the recovery order of the private power generator and the plurality of factory loads as described above, and the recovery order of the private power generator and the plurality of factory loads read from the recovery order table. a restoration order changing unit 4 that changes so as to suppress voltage fluctuations in the power system based on information on the current state of the power system input by the system information input unit 1; outputting a control signal to a circuit breaker of a distribution line for a bus based on information on the current state of the electric power system; A data processing unit 6 having a control signal output unit 5 that outputs a control signal to the circuit breaker of the transmission line of the generator and the distribution line for each factory load, and the power supply input by the system information input unit 1 Storage of data such as information indicating the current state of the power system of the target facility, the restoration order list set by the restoration order setting unit 3, and the restoration order of the private generator and multiple factory loads changed by the restoration order change unit 4, and It has a data storage unit 7 that transfers data to and from the data processing unit 6. Specifically, for example, a normal computer having a central processing unit and memory, and terminal equipment such as a keyboard, mouse, and display device. consists of

FIGS. 2A and 2B are flowcharts showing the first half and the second half of the operation procedure of the power failure recovery operation method according to one embodiment of the present invention executed by the power failure recovery operation device of the above embodiment. , In step S1, a trouble such as a disconnection or short circuit occurs in the power system of the facility to which power is supplied, and the interconnection line from the power company trips (automatically disconnects) and the interconnection stops, and the power system of the facility to which power is supplied becomes an isolated isolated system, in step S2, it is first determined whether or not it is possible to maintain the isolated isolated system by power supply from the private power generator, and if it is not possible to maintain the isolated isolated system, in step S3, the power By performing the opening operation of the circuit breaker (breaker) that makes the system completely blackout, and in step S4, repeatedly determining whether or not the isolated isolated system has been eliminated by the relief (power supply) from the electric power company at predetermined time intervals, Wait for the dissolution of the independent separation system.

Then, in step S4, when it is determined that the independent separation system has been eliminated by the relief from the electric power company, in step S5, the circuit breaker at the interconnection point from the electric power company is closed, and then in step S6, that After confirming the voltage of the secondary busbar (superior busbar) of the circuit breaker at the interconnection point, in step S7, the circuit breakers on the primary and secondary sides of the substation equipment are closed, and the It is possible to supply power to a plurality of factory loads connected directly or via substation equipment to the secondary side busbar (lower busbar) of the secondary side circuit breaker, and then in step S8, a private generator and a plurality of Refer to the restoration ranking table that determines the restoration order of the factory load.

After that, in step S9, it is determined whether or not any of the private power generators can be restored. If it is determined that it is possible (startable and operable), in step S10, the recovery priority of the in-house power generator that has become recoverable is reflected in the recovery order table, and the recovery order read from the recovery order table is set. After changing, the process proceeds to step S11. On the other hand, if it is determined that none of the in-house power generators can be restored, the process skips step S10 and proceeds to step S11.

In step S11, among private power generators and factory loads that do not have a recovery flag indicating that restoration has been completed in the recovery ranking list, the highest priority private power generator or factory load is adjusted according to the load characteristics of the factory load and the voltage of the private power generator. In consideration of functions, it is determined whether or not restoration is possible without any problem in terms of power quality. If restoration is possible without any problem in terms of power quality, proceed to step S12. . Then, in step S12, the highest restorable in-house generator or factory load is restored, and a restoration flag is set for the in-house generator or factory load in the restoration order list. In addition, when restoring the private power generator, the circuit breaker between the private power generator and the secondary bus (lower bus) is also closed, and the power from the private power generator to the secondary bus is closed. Enable power supply. Also, when restoring the factory load connected to the secondary side busbar (lower busbar) of the secondary side circuit breaker of the upper substation equipment via the lower substation equipment, first Closes the circuit breaker on the secondary side and secondary side to enable power supply to the factory load. Then, in subsequent step S13, it is determined whether or not the private power generator and the plurality of factory loads have all been restored, and it is determined that some of the private power generator and the plurality of factory loads remain unrestored. If so, the process returns to step S9, and if it is determined that all of the in-house power generator and the multiple factory loads have been restored, the operation ends.

FIG. 3 is an explanatory diagram showing an example of the power system of the facility to be supplied with power to which the recovery operation device and the recovery operation method of the above embodiment perform the recovery operation, in a normal state. An upper bus line UM connected by an interconnection line, two upper transforming facilities UT1 and UT2 each having a primary side connected to the upper bus line UM, and secondary sides of these upper transforming facilities UT1 and UT2. The two substations LM1 and LM2 respectively connected to the substation, the substation equipment LT having the primary side connected to the substation bus LM2, and the secondary side of the substation equipment LT. Two in-house power generators 1 and 2 (G1, G2) connected to another lower busbar LM3, lower busbars LM1 and LM2 with transmission lines, respectively, and distribution lines are connected to the lower busbar LM1, respectively. factory load A (FLA) and factory load B (FLB), and factory load C (FLC) and factory load D (FLD) respectively connected to subordinate buses LM3 and LM2.

Furthermore, this electric power system includes a circuit breaker B1 provided in the interconnection line from the electric power company PS to the upper bus line UM, two upper substation facilities UT1 each having a primary side connected to the upper bus line UM, Circuit breakers B2 and B3 respectively provided on the transmission line of UT2, and circuit breakers B4 and B5 respectively provided on the transmission line from the secondary side of the upper substation equipment UT1 and UT2 to the lower bus lines LM1 and LM2, Circuit breakers B6 and B7 respectively provided in the transmission lines from the private power generators 1 and 2 (G1 and G2) to the lower bus lines LM1 and LM2, and the lower substation equipment whose primary side is connected to the lower bus line LM2. A circuit breaker B8 provided on the transmission line of LT, a circuit breaker B9 provided on the transmission line from the secondary side of the substation equipment LT to the substation bus LM3, and substations LM1, 2, 3 to 4 It comprises four circuit breakers B10-B13 respectively provided on four distribution lines to four factory loads A-D (FLA, FLB, FLC, FLD).

In addition, as shown in the restoration ranking table of FIG. 5, the restoration order of the private power generators 1 and 2 and the factory loads A, B, C, and D in this electric power system is higher if none of them have been restored. In order of closeness to the secondary side of substation equipment UT1 and UT2, in order of small voltage fluctuation due to restoration of connection (assumed to be B and D) and factory loads (assumed to be B and D) that generate by-product gas that is the fuel required to restore private power generators (voltage Considering the variation B<D<C<A), for example, No. 5, No. 6, No. 4, No. 1, No. 3, and No. 2 are used. Further, as shown in the restoration order table in FIG. 10, when private power generator 1 becomes operable in the middle of the operation to restore the load of all factories, priority is given to recovery of private power generator 1, and further recovery of FIG. As shown in the ranking table, in the operating state (after restoration) after starting the private power generator 1, the order of proximity to the private power generator 1 and the order of small voltage fluctuation due to connection restoration (here, due to the private power generator 1 being started) Considering the voltage fluctuation A<C, for example, the factory load A is set to No. 1 and the factory load C is set to No. 2.

In a normal state, the circuit breakers B1 to B13 are all "closed", that is, in an energized state. , LM2, and LM3, the factory loads A, B, C, and D are supplied with electricity, and the factory loads A, B, C, and D are also supplied with electricity from private generators 1 and 2 connected in parallel with them.

FIG. 4 is an explanatory diagram showing the state of the power system of the power supply target facility when the power company stops the interconnection. Only the circuit breaker B1 is "open" or cut off, the other circuit breakers B2-B13 are still closed.

FIG. 5 is an explanatory diagram showing the state of the power system of the power supply target facility at the time of a total power failure after the power company stopped the interconnection and failed to maintain the single power supply, and the restoration ranking table of the private generator and the factory load. In this state, the independent maintenance of the power system failed, so in order to prevent adverse effects on the factory load due to voltage fluctuations, etc., the other circuit breakers B2 to B13 are all opened, and the private generators 1 and 2 are also stopped. , the power system of the above-mentioned power supply target facility is completely blacked out.

FIG. 6 is an explanatory diagram showing the state at the beginning of the restoration operation following the restoration of the interconnection from the electric power company after the total blackout of the power system of the power supply target facility, and the restoration ranking table of the private generator and the factory load. Here, only the circuit breaker B1 provided in the interconnection line from the electric power company PS to the upper bus line UM is closed, and power is restored to the upper bus line UM. The order of restoration of private power generators 1 and 2 and factory loads A, B, C and D is 5th, 6th, 4th, 1st, 3rd and 2nd.

FIGS. 7 and 8 show Case 1 in which the factory load is fully restored without waiting for the in-house power generators 1 and 2 to start. FIG. 7 is an explanatory diagram showing the state when the primary and secondary side circuit breakers of the upper-level substation equipment are turned on, and the restoration order list of the private generator and the factory load in the restoration operation from the state shown in FIG. 6 above. , Here, in addition to the circuit breaker B1 provided in the interconnection line from the electric power company PS to the upper bus line UM, the circuit breaker B2 provided in the transmission lines on the primary and secondary sides of the upper substation facilities UT1 and UT2 ˜B5 are also turned on, and power is restored to the lower buses LM1 and LM2. The recovery order of the private power generators 1 and 2 and the factory loads A, B, C and D is still 5th, 6th, 4th, 1st, 3rd and 2nd.

FIG. 8 is an explanatory diagram showing the state when all the factory loads are restored and the restoration order list of the private power generator and the factory load in the restoration operation (case 1) from the state shown in FIG. The circuit breakers B8 and B9 provided in the transmission lines on the primary and secondary sides of the substation equipment LT connected to the substation bus LM2 are also closed, and the substation bus LM3 is also restored. , factory loads A, B, C, and D are all restored by closing the circuit breakers B10 to B13 in order according to the restoration order list. In the recovery ranking table, a recovery flag is also set in conjunction with the recovery of all factory loads, but private power generators 1 and 2 are still unable to start, so private power generators 1 and 2 (G1, G2) The circuit breakers B6 and B7 provided in the transmission lines from the lower bus lines LM1 and LM2, respectively, are open.

9 to 12 show a case 2 in which the private power generator 1 becomes able to start while the private power generator and the factory load are completely restored. FIG. 9 shows the factory load in the recovery operation from the state shown in FIG. 7 is an explanatory diagram showing a partially restored state and a restoration ranking list for private power generators and factory loads. Here, as shown in FIG. In addition to the circuit breaker B1, the circuit breakers B2 to 5 provided in the transmission lines on the primary and secondary sides of the upper substation facilities UT1 and UT2 are also closed, and power is restored to the lower bus lines LM1 and LM2. The circuit breakers B11 and B13 of the factory loads B and D are closed in order according to the restoration order table, and the factory loads B and D are restored as part of the factory loads. Also in the recovery ranking table, a recovery flag is set at the corresponding position along with the recovery of the factory load.

FIG. 10 shows the state when the circuit breaker is turned on when the in-house power generator 1 can be started in the process of recovery operation (case 2) from the state shown in FIG. FIG. 10 is an explanatory diagram showing the restoration order table, and here, the circuit breaker is in the same state as shown in FIG. 1 and 2 are changed to No. 1 and No. 4, and factory loads A and C are changed to No. 3 and No. 2.

FIG. 11 is an explanatory diagram showing the recovery operation (Case 2) from the state shown in FIG. The private power generator 1 is activated and restored, and the circuit breaker B6 provided in the transmission line from the private power generator 1 to the lower bus line LM1 is also closed. Also in the recovery order table, a recovery flag is set in accordance with the recovery of the private power generator 1 . Then, since the private power generator 1 has been restored (started and operated), the priority of the private power generator 2 is 3, taking into account the order of proximity to the private power generator 1 and the order of the voltage fluctuation due to connection restoration. and factory loads A and C are changed to No. 1 and No. 2. In addition, when private power generators 1 and 2 are restored, priority is given to the restoration of the auxiliary equipment necessary for startup, and the private power generators will be restored sequentially from the auxiliary equipment that has been restored and is ready to start. go.

FIG. 12 is an explanatory diagram showing the state when all the factory loads are restored and the restoration order list of the private power generator and the factory load in the restoration operation (case 2) from the state shown in FIG. The circuit breakers B8 and B9 provided in the transmission lines on the primary and secondary sides of the substation equipment LT connected to the substation bus LM2 are also closed, and the substation bus LM3 is also restored. , factory loads A and C, the circuit breakers B10 and B12 are closed in the order according to the restoration order table, and all the factory loads are restored. In the recovery ranking table, a recovery flag is set in conjunction with the restoration of all the plant loads, but since private power generator 2 is still in a state where it cannot be started, the private power generator 2 (G2) is transferred to the lower bus line LM2. The circuit breaker B7 provided in the transmission line is in an open state.

Therefore, according to the recovery operation device and the recovery operation method of the above-described embodiment, after the total blackout of the power system of the power supply target facility, the power supply system can restore the interconnection from the electric power company and the private power generators 1 and 2 without waiting for recovery. Even in the restoration operation (Case 1) in the unrestored state of generators 1 and 2, after the total blackout of the power system of the power supply target facility, the interconnection restoration from the electric power company and only the in-house generator 1 Even in the halfway recovery operation (Case 2), while considering the load characteristics and the voltage adjustment function of the in-house generator, which are problematic in terms of power quality, the circuit breaker for power distribution for the factory load is confirmed to be restored to the bus line. It is possible to quickly recover from power outages while maintaining power quality.

Although the above has been described based on the illustrated examples, the recovery operation device and the recovery operation method of the present invention are not limited to the above examples, and can be appropriately modified within the scope of the claims. The power supply target facility is not limited to the ironworks, and the electric power system of the power supply target facility and the number of substation facilities, private power generators, and factory loads therein are not limited to those shown in the figure.

In addition, when all factory loads are restored, the flow chart shows the operation procedure of the recovery operation method in which the private power generator is not automatically restored, but it is also possible to automatically restore the private power generator.

According to the recovery operation device and recovery operation method from a power failure of the present invention, early recovery from a power failure is achieved while maintaining the power quality, taking into consideration the load characteristics that pose problems in terms of power quality and the voltage adjustment function of the in-house power generator. It can be carried out.

1 system information input unit 2 system information display unit 3 load restoration order setting unit 4 load restoration order change unit 5 control signal output unit 6 data processing unit 7 data storage unit B1 to B13 circuit breakers FLA to FLD factory loads A to D
G1, G2 Private power generators 1, 2
LM1 to LM3 Lower busbars 1 to 3
LT Lower substation equipment PS Electric power company UM Upper bus bar UT1, UT2 Upper substation equipment

Claims (6)

In normal times, when the power system of the power supply target facility, in which a private generator is connected to the power company's main system to supply power to multiple factory loads, during a total power failure of the power system,
A recovery operation from a power failure, characterized in that an automatic recovery operation is performed so as to suppress voltage fluctuations in the power system of the power supply target facility according to the characteristics of the factory load and the operating status and startability status of the private power generator. Method. When the power system of the power supply target facility falls into a total blackout due to the high-level bus connecting the primary side of the high-level substation equipment to the main system of the electric power company becoming no voltage,
First, as a full power outage release operation, the circuit breaker on the primary side and secondary side of the upper transforming equipment, the primary side and secondary of the lower transforming equipment whose primary side is connected to the secondary side of the above transforming equipment side circuit breaker, the circuit breaker of the transmission line of the private generator to the lower busbar connected to the secondary side of the upper transforming equipment or the secondary side of the lower transforming equipment, and the circuit breaker from the lower busbar Automatically open the circuit breaker of the distribution line for each factory load,
Then, after waiting for the restoration of the main system of the electric power company, while monitoring the voltages of the upper and lower bus lines and the power flow flowing through each circuit breaker, 2. The recovery operation method from a power failure according to claim 1, wherein each of said circuit breakers is automatically turned on downward to perform automatic recovery operation of the power system of said power supply target facility. During the recovery operation of the private generator,
First, perform the restoration operation of the auxiliary equipment necessary for starting the private generator,
3. A recovery operation method from a power failure according to claim 1, wherein when said auxiliary equipment is restored and preparations for starting are made, said private power generator is started and restored. During the restoration operation of the plurality of factory loads,
According to the voltage fluctuation due to the connection of each factory load and the voltage adjustment function of the private power generator, the recovery operation is performed so as to suppress the voltage fluctuation of the power system of the power supply target facility. A recovery operation method from a power failure according to any one of the above. The electric power system of the facility to be supplied with power according to the characteristics of each factory load, the factory load that generates by-product gas that is the fuel necessary for restoring the private power generator, the operating status of the private power generator, and the availability of start-up. The recovery operation of the private power generator and the plurality of factory loads is performed according to a recovery ranking table that defines the recovery order of the private power generator and the plurality of factory loads so as to suppress voltage fluctuations. A recovery operation method from a power failure according to any one of items 1 to 4. In a recovery operation device for automatically recovering from a total power outage in the event of a total power outage in the power system of a power supply target facility where a private generator is normally connected to the power company's main system to supply power to multiple factory loads,
a system information input unit for inputting information indicating the current state of the power system of the power supply target facility, including the operation status and startability status of the private power generator;
Prioritizing a factory load that generates a by-product gas that is a fuel necessary for restoration of the private power generator among the plurality of factory loads, and suppressing voltage fluctuations in the power system of the power supply target facility. and a recovery order setting unit that sets a recovery order table that defines the recovery order of the plurality of factory loads;
a recovery order changing unit that changes the recovery order of the private power generator and the plurality of factory loads read from the recovery order table so as to suppress voltage fluctuations in the power system based on the current state of the power system;
A control signal for outputting a switching control signal to a circuit breaker of a transmission line of the private power generator and a distribution line for each of the factory loads based on the recovery order of the private power generator and the plurality of factory loads read from the restoration order table. an output unit;
A recovery operation device from a power failure, characterized by comprising:

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