JP7411971B1 - Power supply system and method - Google Patents

Abstract

An object of the present invention is to provide a power supply-related technology that performs a load test without separately using a simulated load. [Solution] A power supply system that controls a battery unit that is a backup power source of equipment, the system includes a power outage power supply unit that supplies power from the battery unit to the equipment during a power outage, and a power supply unit that supplies power from the battery unit to the equipment during normal times. A load test is carried out on the normal power supply unit that supplies power to a power system separate from the equipment (hereinafter referred to as “separate system”) and the battery unit with the separate system as a simulated load in case of a power outage, and the equipment is tested. and a load test section that simulates driving during the guaranteed operating time. [Selection diagram] Figure 1

Description

The present invention relates to a power supply system and a power supply method.

Conventionally, it is well known to provide an emergency generator such as a diesel generator as a backup power source so that fire extinguishing equipment can be operated even during a power outage.

This type of emergency generator is required to undergo a load test approximately once a year in accordance with the provisions of laws and regulations. In this load test, it is confirmed that the fire extinguishing equipment can be operated without any abnormality over the legal operating time (one of the guaranteed operating times and stipulated by law).

Note that if fire extinguishing equipment (sprinklers, etc.) is operated as part of an actual load test, actual damage such as flooding of buildings will occur. Therefore, a load test is performed by connecting a simulated load to the emergency generator instead of the fire extinguishing equipment.

Note that Patent Document 1 discloses a technique that ``a spare storage battery is provided so that the fire extinguishing equipment can be driven even during a power outage, and the surplus of the storage battery is discharged to contribute to power leveling.''

Japanese Patent Application Publication No. 2022-112553

Generally, the simulated loads used for load testing (a large thermal resistor, for example) are large and heavy. Therefore, it was necessary to conduct load tests by carrying simulated loads one by one to distant sites where fire extinguishing equipment was installed. Therefore, there was a problem that it was a difficult task.

Furthermore, emergency generators are often located in narrow and recessed areas, which poses issues such as the need for additional construction work to secure space for large simulated loads.

Further, even when a storage battery is used as a backup power source for fire extinguishing equipment as in Patent Document 1, a load test is required to ensure operation of the fire extinguishing equipment during a power outage.

In that case, since it is necessary to connect a simulated load to the storage battery, the problems caused by the simulated load described above also occur.

In addition, Patent Document 1 does not assume that a load test is performed on a battery unit such as a storage battery, and there is no disclosure of problems or countermeasures for load tests (simulated loads) of battery units.

Therefore, in order to solve at least one of the above-mentioned problems, it is an object of the present invention to provide a power supply-related technique for conducting a load test without separately using a simulated load.

The present invention is a power supply system that controls a battery unit that is a backup power source for equipment, and has the following configuration.

The power supply unit during a power outage supplies power from the battery unit to the equipment during a power outage.
During normal times, the power supply section supplies the power of the battery section to a power system (hereinafter referred to as "separate system") that is separate from the equipment.

The load test section performs a load test on the battery section using the separate system as a simulated load in preparation for the power outage, and simulates driving of the equipment during the guaranteed operating time.

With the above solution, the present invention makes it possible to perform a load test using another system that supplies power during normal times as a simulated load, without using a separate simulated load.

Note that the detailed contents of the problems, configurations, and effects other than those described above will be explained in the embodiments described later.

FIG. 1 is a block diagram showing the configuration of the first embodiment. FIG. 2 is a flowchart (first half) illustrating the operation of the load test mode. FIG. 3 is a flowchart (second half) illustrating the operation of the load test mode. FIG. 4 is a diagram illustrating a conversion process based on the discharge current pattern of each phase of a three-phase induction motor (no starting current suppression). FIG. 5 is a diagram illustrating a conversion process based on the discharge current pattern (with starting current suppression) of each phase of a three-phase induction motor. FIG. 6 is a diagram illustrating a conversion process based on the discharge current pattern of the output terminal of the battery section 110. FIG. 7 is a diagram illustrating an equivalent circuit of the internal impedance of the battery section 110 and a deterioration diagnosis. FIG. 8 is a flowchart (first half) illustrating the operation in the autonomous operation mode. FIG. 9 is a flowchart (second half) illustrating the operation in the autonomous operation mode. FIG. 10 is a diagram illustrating an example of power distribution of the battery section 110. FIG. 11 is a block diagram illustrating the configuration of the second embodiment. FIG. 12 is a flowchart (first half) illustrating the operation of the virtual power plant mode. FIG. 13 is a flowchart (second half) illustrating the operation of the virtual power plant mode. FIG. 14 is a schematic diagram showing the divisions of safe area SS/auxiliary area SA/disaster-stricken area D in the form of a map.

Embodiments of the present invention will be described below with reference to the drawings.

《Overall configuration of Example 1》
First, the configuration of Example 1 will be explained in order.
FIG. 1 is a block diagram showing the configuration of the first embodiment.
In FIG. 1, power storage station X and equipment Z are located in area P.
The equipment Z here is referred to as an emergency load that is preferentially driven during a power outage (when a lifeline is stopped), and refers to, for example, the following facility equipment.
・Sprinklers, fire pumps, fire extinguishing equipment, elevators, water supply pumps, sewage pumps, information and communication equipment, telephone exchanges, hospital equipment, nursing care facility equipment, evacuation shelter equipment, disaster supply center equipment, etc.

At power storage station X, a power supply system 100 for controlling power supply to equipment Z is arranged.

As shown in FIG. 1, the power supply system 100 includes a battery unit 110, a power outage supply unit 120, a normal power supply unit 130, a normal detection unit 140A to 140B, a load test unit 150, a starting current suppression unit 160A to B, and a charge/discharge unit. It includes a control section 170, a three-phase/DC converter 180, a three-phase inverter 190, a pulsating current measuring section 110a, and the like.

Next, each configuration of the power supply system 100 will be explained.
First, the battery unit 110 is a storage battery that can be used repeatedly, and is provided as a backup power source for the equipment Z. For example, it is composed of a lithium ion battery.

The power supply unit 120 during a power outage is a power control circuit that monitors the power receiving system 210 receiving power transmission from the outside and, when detecting the occurrence of a power outage, supplies power from the battery unit 110 to the equipment Z preferentially.

In addition, by providing a power switch circuit in the power supply section 120 during a power outage, which connects the power receiving system 210 to the equipment Z during normal times and switches the power connection to the power system of the battery section 110 during a power outage, the power system to the equipment Z can be unified. You may.

The normal power supply unit 130 is a power control circuit that supplies the power of the battery unit 110 to a power system (separate system 220) different from the equipment Z during normal times. Note that the normal power supply section 130 includes a valve and a switching converter that combine the power from the battery section 110 and the power from the power receiving system 210 at a predetermined ratio (0 to 100%) and supply it to another system 220. Good too.

The separate system 220 here may be, for example, a power system that supplies power to power consumption destinations such as within the same facility, nearby or far away, or a resource aggregator (including the power retail market, etc.) that adjusts power supply and demand and It may also be an electric power system where buying and selling takes place.

The normal detection units 140A to 140B are detection circuits that detect the amount of power supplied to the separate system 220. In FIG. 1, a normal time detection section 140A is provided on the DC system side, and a normal time detection section 140B is provided on the AC system side. Depending on the power control circuit type, only one of these normal detection units 140A to 140B may be used.

The load test section 150 performs a load test on the battery section 110 using the separate system 220 as a simulated load in preparation for an unexpected power outage. The load test here is a load test that simulates the drive of the equipment Z during the legal operating hours using the normal power supply amount to the separate system 220. The legal operating time here is an example of a guaranteed operating time that guarantees the operation of the equipment Z in the event of a power outage, and specifically refers to the time specified by law. The load test unit 150 remotely outputs the load test results to an external management center or the like via a wired or wireless communication network (such as the Internet).

Preferably, the load test unit 150 obtains information about the amount of power supply detected by the normal detection units 140A to 140B, and performs conversion based on the difference between the load on the separate system 220 and the load on the equipment Z. Based on this conversion, the load test section 150 simulates the operation of the equipment Z within the legal operating time.

More preferably, the load test section 150 includes functions such as a simulated power outage section 151, a discharge calculation section 152, a discharge pattern conversion section 153, an abnormality determination section 154, and a surplus detection section 155.

Among these, the simulated power outage section 151 instructs the charge/discharge control section 170 to stop power recovery (charging) of the battery section 110 over the period of the load test. This operation simulates a power outage state (lifeline stoppage state).

The discharge calculation unit 152 acquires information by sampling over time the value of the discharge current or charge amount to the separate system 220 detected by the normal detection units 140A to 140B in a simulated power outage state.

The discharge pattern conversion unit 153 converts the value that the discharge calculation unit 152 acquires information over time into a discharge current pattern necessary for operation of the equipment Z. In this conversion, the discharge pattern conversion unit 153 checks whether the legal operating time of the equipment Z has been reached on the time axis of the discharge current pattern.

The abnormality determination unit 154 determines whether the power supply system 100 (battery unit 110, etc.) is normal or abnormal in the load test.

If the test for determining normality/abnormality here is a legal load test, it is performed in accordance with test items stipulated by laws and regulations. Furthermore, in the case of a voluntary load test, normality/abnormality may be determined for parts of the power supply system 100 that have low durability or a high failure rate.

For example, the test items performed by the abnormality determination unit 154 are as follows.
- Measuring the electrical characteristics of the battery section 110 to determine normality/abnormality - Determining the presence or absence of liquid leakage in the battery section 110 using an image sensor, chemical sensor, catalyst sensor, weight sensor, etc. - Checking for swelling (deformation) of the battery section 110 The presence or absence is determined by an image sensor, a strain sensor, etc. - Abnormal odor in the battery part 110 is determined by an odor sensor, chemical sensor, etc. - Irregular sounds (abnormal sounds) in the battery part 110 are determined by a sound sensor, etc. - Abnormal vibrations in the battery part 110 Determine abnormal heat generation in the battery section 110 using a vibration sensor, image sensor, etc. Determine abnormal heat generation in the battery unit 110 by a temperature sensor, infrared sensor, etc. Others

The surplus detection unit 155 detects (including estimation) the surplus power remaining in the battery unit 110 after the load test. The surplus detection unit 155 detects the surplus power remaining after the load test, thereby detecting the surplus power of the battery unit 110 in a more realistic manner. The normal power supply unit 130 supplies power from the battery unit 110 to the separate system 220 within a range defined by the surplus power determined by the surplus detection unit 155.

The starting current suppressors 160A to 160B are electric circuits or control circuits that suppress excessive inrush current that occurs when starting the equipment Z. By reducing the power required for starting the equipment Z by the starting current suppressing units 160A to 160B, it becomes possible to increase surplus power. Note that only one of these starting current suppressors 160A to 160B may be used depending on the effect and type of suppressing the starting current.

For example, the starting current suppressing section 160A on the DC system side has the following circuit.
・Circuit that can instantaneously supply direct current rush current (capacitor, electric double layer, etc.)
・Circuit that instantly suppresses excessive inrush current (limiter circuit, constant current circuit, reactance circuit, load switching insertion circuit, etc.)

Further, for example, the starting current suppressing section 160B on the three-phase AC system side includes the following circuit in addition to a circuit based on the same suppression principle as the starting current suppressing section 160A.
・Start control using Y-Δ switch circuit ・Circuit that starts the frequency and/or voltage of the inverter output low at startup

The charge/discharge control section 170 is a circuit that controls discharging and charging of the battery section 110 in accordance with control commands from the power supply system 100 and the like. For example, the charge/discharge control section 170 charges the battery section 110 with nighttime power under timer control. For example, the charge/discharge control unit 170 monitors a decrease in the terminal voltage of the battery unit 110 and charges the battery unit 110 as needed. The charge/discharge control unit 170 is supplied with DC power from a three-phase/DC converter 180, generated power (solar battery, wind power, etc.) as power input for charging.

The three-phase/DC converter 180 is a circuit that converts the three-phase alternating current of the power receiving system 210 into direct current and supplies it to the charging/discharging control unit 170 as charging power.

The three-phase inverter 190 is a circuit that converts the discharge power (direct current) of the battery section 110 into three-phase alternating current and supplies it to the power supply section 120 during power outage and the power supply section 130 during normal times.

Note that the three-phase/DC converter 180 and the three-phase inverter 190 are sometimes collectively referred to as a bidirectional inverter.

The pulsating current measurement unit 110a is a measurement circuit that applies a pulsating current to the terminals of the battery unit 110 to determine the internal impedance of the battery unit 110. The load test section 150 diagnoses deterioration of the battery section 110 and calculates power loss based on the internal impedance determined by the pulsating current measurement section 110a.

Note that the part related to information processing of the power supply system 100 described above may be configured by a computer system including a CPU (Central Processing Unit), a memory, and the like as hardware. When this hardware executes the "information processing program for power supply system 100" stored in a computer-readable medium, information processing of power supply system 100 (power supply method) is realized.

Part or all of such hardware may include a dedicated device, machine learning machine, DSP (Digital Signal Processor), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit), PLD (Programmable Gate Array), etc. (rammable logic device) etc. may be substituted.

In addition, by concentrating or distributing some or all of the hardware and programs on servers on the cloud to configure a cloud system, information services of the "power supply system 100" can be provided to multiple power storage stations X. You can.

《Flow of operation of Example 1》
Next, the overall operation of the first embodiment will be explained in order. In the description here, in order to clarify the subject of each operation, the operation corresponding to the "〇△ step" in the claims will be described as an operation with the "〇△ section" as the main body.

《Operation 1: Operation in load test mode》
2 and 3 are flow diagrams illustrating the operation of the load test mode.
The load test mode described here is not only executed in accordance with the legal timing of the load test, but also executed autonomously or at any time in response to an external command.

Hereinafter, the operation contents of the load test will be explained along the step numbers shown in FIGS. 2 and 3.

Step S01: The power supply unit 120 during a power outage monitors the power supply state of the power receiving system 210, and transmits information about the state to the load test unit 150. The load test unit 150 starts the subsequent load test only when it is confirmed that the power supply from the power receiving system 210 is stable for a certain period of time (that is, during normal times). For example, if an unstable event such as a momentary power outage or voltage fluctuation in the power receiving system 210 is detected, the load test unit 150 determines that the event is a precursor to a power outage, and does not start the load test just in case. Furthermore, even if the load test unit 150 obtains weather information and disaster information via a network or the like and determines that there is a possibility of a power outage, it does not start the load test just in case.

Step S02: The simulated power outage section 151 instructs the charge/discharge control section 170 to perform charging (or discharging) until the terminal voltage (release voltage or connection voltage) of the battery section 110 reaches the rated voltage. The rated voltage at this time is the battery voltage at the time of starting the load test, and for example, any of the following voltages can be selected.
- Discharge starting voltage of the battery section 110 (voltage at the start of discharging during cycle operation)
・Voltage when the battery unit 110 is fully charged ・Upper limit voltage when charging the battery unit 110 (lower voltage than when fully charged to suppress battery deterioration)
・The maximum voltage, average voltage, high-frequency voltage, or minimum voltage during power supply to the separate system 220 ・If the rated voltage is specified by a legal load test, that voltage ・Others

After confirming that the terminal voltage of the battery section 110 has reached the rated voltage, the simulated power outage section 151 instructs the charge/discharge control section 170 to stop charging the battery section 110 for the duration of the load test. This operation creates a simulated power outage state during the load test.

Step S03: The normal power supply unit 130 regards the separate system 220 as a simulated load and starts discharging.

Step S04: The normal detection units 140A to 140B (current sensors, etc.) measure the discharge current (or charge amount, hereinafter omitted) flowing from the battery unit 110 to the separate system 220 over time.

Step S05: The discharge calculation unit 152 samples the measured values of the discharge current measured by the normal detection units 140A to 140B over time, and calculates the value of the amount of charge released from the battery unit 110 to the separate system 220 over time. Get information. For example, for the DC current measured by the normal detection unit 140A, the discharge calculation unit 152 calculates the charge amount over time by integrating the sampling values of the DC current on the time axis. On the other hand, in the case of an alternating current measured by the normal detection unit 140B, the amount of charge is determined over time by integrating the "absolute value of the sampling value (effective value may be used)" of the alternating current on the time axis. Furthermore, in the case of three-phase AC, the amount of charge is determined over time by adding the integrated values for the three phases (or multiplying the value for one phase by three).

Step S06: The discharge pattern conversion unit 153 calculates in advance a discharge current pattern (time waveform of discharge current, time waveform of integrated value of discharge current, etc.) required when driving equipment Z during a power outage through actual measurement or simulation. and retain information. This discharge current pattern includes a current pattern at the time of starting the equipment Z, and a current pattern that increases and decreases over time according to operation control of the equipment Z (program control, timer control, etc.). Furthermore, it is preferable that this discharge current pattern also includes a current loss (efficiency) on the discharge path such as the three-phase inverter 190 as a current pattern.

The discharge pattern conversion unit 153 performs conversion processing into a simulated operation time of the equipment Z by comparing the charge amount obtained over time with the discharge current pattern required for the operation of the equipment Z. An example of conversion processing for a specific discharge current pattern will be described below.

FIG. 4 is a diagram showing the discharge current pattern of each phase of the three-phase induction motor that is the power unit of equipment Z (without starting current suppressors 160A to 160B). In the discharge current pattern shown in [A] of FIG. 4, at the time of starting, a starting current that is about 5 to 6 times that of a steady state momentarily flows. As shown in [B] to [D] in FIG. 4, the discharge pattern conversion unit 153 interpolates the area equivalent of the amount of charge calculated over time in step S05 to the inside of the waveform of each phase (shaded area). Perform the conversion process. By sequentially advancing the discharge current pattern in the time direction through this conversion process, the simulated operating time of the equipment Z is determined.

FIG. 5 is a diagram showing the discharge current pattern of each phase of the three-phase induction motor that is the power unit of equipment Z (with starting current suppressors 160A to 160B). In the discharge current pattern shown in [A] of FIG. 5, the starting current is suppressed by the starting current suppressing section 160B (Y-Δ switch circuit) to about 1.7 to 2 times the normal state. As shown in [B] to [D] in FIG. 5, the discharge pattern conversion unit 153 interpolates the area equivalent of the amount of charge calculated over time in step S05 to the inside of the waveform of each phase (shaded area). Perform the conversion process. By sequentially advancing the discharge current pattern in the time direction through this conversion process, the simulated operating time of the equipment Z is determined.

[A] in FIG. 6 is a diagram in which the discharge current pattern of the three-phase induction motor that is the power unit of equipment Z (without starting current suppressors 160A to B) is replaced with the discharge current of the output terminal of battery unit 110. In the discharge current pattern shown in [A] of FIG. 6, at the time of starting, a starting current that is about 5 to 6 times that of a steady flow momentarily flows. As shown in [A] of FIG. 6, the discharge pattern conversion unit 153 performs a conversion process of interpolating the area equivalent of the amount of charge calculated over time in step S05 to the inside of the waveform (shaded area). By sequentially advancing the discharge current pattern in the time direction through this conversion process, the simulated operating time of the equipment Z is determined.

[B] in FIG. 6 is a diagram in which the discharge current pattern (with starting current suppressors 160A to B) of the three-phase induction motor that is the power unit of equipment Z is replaced with the discharge current of the output terminal of the battery unit 110. In the discharge current pattern shown in [B] of FIG. 6, the starting current is suppressed by the starting current suppressing section 160B (Y-Δ switch circuit) to about 1.7 to 2 times the normal state. As shown in [B] in FIG. 6, the discharge pattern conversion unit 153 performs a conversion process of interpolating the area equivalent of the amount of charge calculated over time in step S05 to the inside of the waveform (shaded area). By sequentially advancing the discharge current pattern in the time direction through this conversion process, the simulated operating time of the equipment Z is determined.

Step S07: The abnormality determining unit 154 determines whether the battery unit 110 is normal or abnormal. The details of the determination operation here are omitted because they have been explained previously.

Step S11: If it is determined that the battery section 110 is normal, the abnormality determining section 154 advances the operation to step S12. On the other hand, if it is determined that the battery section 110 is abnormal, the abnormality determination section 154 shifts the operation to step S13.

Step S12: The load test section 150 determines whether the terminal voltage of the battery section 110 drops to the discharge end voltage before the simulated operation time reaches the legal operation time of the equipment Z. If the voltage has fallen to the discharge end voltage, the load test unit 150 determines that the legal operating time of the equipment Z cannot be cleared, and moves the operation to step S13. On the other hand, if the discharge end voltage has not been lowered, the load test section 150 advances the operation to step S14.

Step S13: Here, since the load test has failed, the load test unit 150 generates an information report regarding the “load test result (failure)” and “status of the battery unit 110 (normal/abnormal)” and sends it to the management center etc. Output to remote. After the above reporting operation, the load test section 150 stops operating in the load test mode.

Step S14: Here, the discharge pattern conversion unit 153 determines whether the simulated operation time has reached the legal operation time of the equipment Z in the load test. When the legal operating time is achieved (cleared), the discharge pattern conversion unit 153 determines "load test: complete" and proceeds to step S15. On the other hand, if the legal operating time has not yet been reached, the discharge pattern conversion unit 153 returns the operation to step S04 to continue the load test.

Step S15: The surplus detection unit 155 determines the surplus power of the battery unit 110 immediately after completion of discharging in the load test. For example, the surplus power may be determined by estimating the remaining capacity (SOC) of the battery unit 110 at this point from electrical characteristics (terminal voltage, etc.). Alternatively, for example, the discharge from the battery unit 110 at this time to the separate system 220 may be restarted, and the surplus power may be determined from the amount of power (integrated value of current, etc.) discharged until the discharge end voltage is reached.

Step S16: The pulsating current measurement unit 110a applies a pulsating current to the terminals of the battery unit 110 at an appropriate timing to obtain the internal impedance of the battery unit 110.

[A] in FIG. 7 is a diagram showing an equivalent circuit of internal impedance of the battery section 110.
[B] in FIG. 7 is a diagram showing a high-order equivalent circuit of the internal impedance of the battery section 110.

The pulsating flow measuring section 110a calculates internal impedance (complex number) based on the gain response and phase response of the battery section 110 to the pulsating flow, and outputs the information to the load testing section 150.

[C] in FIG. 7 is a graph showing a change in internal impedance over time when the battery section 110 is operated in cycles.

The load test section 150 diagnoses the deterioration of the battery section 110 by comparing the internal impedance determined by the pulsating current measurement section 110a with this graph. Furthermore, the load test section 150 determines the power loss inside the battery based on the internal impedance.

Step S17: The load test section 150 creates an information report by summarizing "load test: success" and "status of the battery section 110 (surplus power, deterioration diagnosis, power loss inside the battery, etc.)". The load test unit 150 remotely outputs the created information report to a management center or the like.

Step S18: The simulated power outage unit 151 instructs the charge/discharge control unit 170 to restart charging of the battery unit 110, and restores the battery unit 110 to the charging voltage before the load test.

Step S19: The load test unit 150 remotely outputs "Load test: successfully completed" to the management center, etc., and ends the operation in the load test mode.

A load test on the battery section 110 (power supply system 100) is completed through the series of operating procedures described above.

《Operation 2: Operation in autonomous operation mode》
Next, autonomous operation of the power supply system 100 during normal times and during power outages will be described.

8 and 9 are flowcharts illustrating the operation of the autonomous operation mode.
This operation will be described below in accordance with the step numbers shown in FIGS. 8 and 9.

Step S101: The charging/discharging control unit 170 determines whether it is the charging timing for cycle operation (charging←→discharging). In general, charging timing includes regular timing such as nighttime, and temporary timing due to battery exhaustion. If it is the charging timing, the charging/discharging control unit 170 advances the operation to step S102. On the other hand, if it is not the charging timing, the charging/discharging control unit 170 shifts the operation to step S106.

Step S102: The charge/discharge control unit 170 charges the battery unit 110 to the discharge start voltage for cycle operation at the charging timing.

Step S103: The surplus detection unit 155 determines the current surplus power by correcting the surplus power of the battery unit 110 determined during the load test based on the discharge start voltage of the cycle operation.

Step S104: The pulsating current measurement unit 110a applies a pulsating current to the terminals of the battery unit 110, determines the internal impedance, and transmits the internal impedance to the load testing unit 150.

Step S105: The load test section 150 performs deterioration diagnosis and power loss calculation of the battery section 110 based on the internal impedance. The load test section 150 remotely outputs the results thus far to a management center or the like as "state of the battery section 110 (current surplus power, deterioration diagnosis, power loss inside the battery, etc.)".

Step S106: The power outage supply unit 120 monitors the power receiving system 210 and discovers the occurrence of a power outage without delay.

Step S111: If a power outage occurs, the power outage power supply section 120 moves the operation to step S117. On the other hand, in the case of normal times (non-power outage), the power outage power supply unit 120 advances the operation to step S112.

Step S112: The normal power supply unit 130 connects the power system of the battery unit 110 to another system 220 to supply power. The power switch circuit in the power supply unit 120 during a power outage connects the power receiving system 210 to the equipment Z to supply power.
Note that the normal power supply unit 130 can vary the ratio between the amount of power supplied from the battery unit 110 and the amount of power supplied from the power receiving system 210 (controlled by a valve, switching converter, etc.) using a set value or an adjustment program, and Power may be supplied to the grid 220. This makes it possible to extend the supply duration of surplus power.

Step S113: The normal detection units 140A and 140B detect the amount of power supplied from the battery unit 110 to the separate system 220 (such as the integrated amount of current in the voltage supply line).

Step S114: The surplus detection unit 155 updates the current surplus power to the latest data by subtracting the amount of power supply detected in step S113 from the current surplus power.

Step S115: The surplus detection unit 155 remotely outputs the latest data on the current surplus power to a management center or the like.

Step S116: The normal power supply unit 130 autonomously performs control to limit the amount of power supplied so as not to exceed the range defined by the surplus power. At this time, in the unlikely event that there is no surplus power left due to battery consumption, the normal power supply unit 130 temporarily stops power supply to the separate system 220 and instructs the charging/discharging control unit 170 to shift to a temporary charging timing. command. After the above operation, the normal power supply unit 130 returns the operation to step S101.

Step S117: In this step, since the power receiving system 210 is in a power outage state, power supply from the power receiving system 210 to the facility Z becomes impossible. Therefore, the power switch circuit in the power supply unit 120 during a power outage disconnects the power receiving system 210 from the equipment Z and starts supplying power from the battery unit 110 to the equipment Z preferentially. At this time, the normal power supply section 130 may autonomously stop or suppress the power supply from the battery section 110 to the separate system 220, thereby increasing the driveable time of the equipment Z during a power outage.

Step S118: The power supply unit 120 during power outage monitors whether the power outage state of the power receiving system 210 has been resolved. If the power outage condition is not resolved, the power outage power supply section 120 returns the operation to step S117. On the other hand, if the power outage state is resolved and it is determined that it is normal, the power outage power supply section 120 returns the operation to step S101.

By appropriately repeating the above-described series of operating procedures, autonomous operation of the power supply system 100 (power supply during normal times and during power outages) is realized.

《Effects of Example 1》
The effects of Example 1 will be described below.

(1) The prior art (Patent Document 1) does not solve the problem regarding the load test of the power storage system. Therefore, as before, it is necessary to carry out load tests by bringing in huge simulated loads one by one, which is expected to be a difficult task.

In contrast, in the first embodiment, a load test is performed by regarding the separate system 220 that supplies power to the battery section 110 during normal times as a simulated load. Therefore, the present embodiment 1 is excellent in that it is not necessary to bring in a huge simulated load one by one, and it is possible to save labor in the load test work.

(2) Furthermore, with a simulated load such as a conventional thermal resistor, the power output for the load test is lost due to heat radiation, resulting in a lot of wasted power. However, in the first embodiment, the power output for the load test can be effectively used as is on the side of the separate system 220, which is a simulated load. Therefore, the first embodiment is excellent in that less power is wasted during the load test.

(3) In particular, in the present Example 1, the dischargeable battery capacity of the battery unit 110 is set to be more than twice the battery capacity required for the load test (or surplus power ≧ the power required to drive the equipment Z for the legal time). If it is made larger, it is possible to guarantee that equipment Z can be operated during a power outage for the legal operating time even immediately after a load test. In this case, the first embodiment is superior in that the load test mode can be implemented at any time during normal operation of supplying power from the battery section 110 to the separate system 220. In that case, it becomes possible to actually measure or estimate the surplus power after the load test at any time.

(4) Furthermore, the first embodiment performs conversion processing based on the difference between the load of the separate system 220 and the load of the equipment Z. Therefore, even if the load of the separate system 220 is different, it is possible to convert it into the legal operating time of the equipment Z. Therefore, the first embodiment is excellent in that even if the loads of the equipment Z and the separate system 220 are different, driving of the equipment Z within the legal operating hours can be demonstrated in a simulated manner.

(5) In particular, in this first embodiment, by converting the discharge current to the separate system 220 into a discharge current pattern to the equipment Z, the operation can be simulated to check whether the legal operating time of the equipment Z has been reached. do. This discharge current pattern also includes a large inrush current required when starting the equipment Z. It also includes a pattern of increase/decrease in current over time associated with operation control of equipment Z. Therefore, this first embodiment is excellent in that it is possible to conduct an empirical load test assuming the starting current (inrush current) of equipment Z and changes in current over time associated with operation control of equipment Z. There is.

(6) Furthermore, in the first embodiment, the normality/abnormality of the battery unit 110 is determined in the load test. Therefore, the present embodiment 1 is excellent in that it is possible to test not only the driving ability of the equipment Z but also the normality/abnormality of the battery section 110.

(7) In particular, in the first embodiment, since the test for normality/abnormality of the battery section 110 is automated, there is no need for a witness to visually check whether the battery section 110 is normal/abnormal. Therefore, the first embodiment is excellent in that it can save labor in load testing.

(8) Generally, the battery capacity (SOC) of the battery section 110 is estimated from the electrical characteristics (terminal voltage, etc.) of the battery section 110 at any given time. However, this battery capacity estimation cannot be said to have empirically determined the remaining capacity (surplus power) that is sufficient to cover the legal operating hours of equipment Z.

On the other hand, in the first embodiment, the surplus power remaining in the battery unit 110 is determined after the drive portion of the legal operating time of the equipment Z is simulatively consumed through a load test. Therefore, the first embodiment is excellent in that the remaining capacity (surplus power) that exceeds the legal driving time of the equipment Z can be empirically determined.

(9) In this way, in the first embodiment, the surplus power is empirically determined through a load test, so that the surplus power at that point in time can be accurately obtained. Therefore, the present embodiment 1 is excellent in that the amount of power supplied to the separate system 220 can be expanded by supplying power to the separate system 220 to the limit of surplus power.

FIG. 10 is a diagram illustrating an example of power distribution of the battery section 110.
In FIG. 10, the maximum dischargeable battery capacity (rated capacity or nominal capacity) is 49.7 kwh, which is obtained by excluding the unusable capacity of 2.5 kwh from the total battery capacity of 52.2 kwh.

Here, assuming that the capacity required to drive equipment Z during the legal operating hours is 15.2 kwh, and estimating the expected capacity for long-term deterioration of the battery section 110 to be a maximum of 9.9 kwh (approximately 20% of the rated capacity), another system 220 The maximum capacity (surplus power) that can be supplied to the area is 24.6 kWh.

However, since the accurate surplus power at the time of deterioration (the latest time) can be obtained through a load test by the load test section 150, it is no longer necessary to provide a margin of 9.9 kwh of expected capacity for long-term deterioration each time. As a result, the capacity (surplus power) that can be supplied to the separate system 220 can be used up to the limit of 34.5 kwh at the time of FIG.

(10) Furthermore, in the first embodiment, power is supplied to the separate system 220 during normal times, limited to the range defined by the surplus power. Therefore, even if there is a power outage at any time, it is possible to secure power from the battery unit 110 for "the legal operating time of the equipment Z". Therefore, the first embodiment is excellent in that it is possible to secure power for "the legal operating hours of equipment Z" in case of an unexpected power outage.

(11) In the first embodiment, the starting current at the time of starting the equipment Z is suppressed by the starting current suppressing sections 160A to 160B. Therefore, as shown in FIGS. 4 to 6, it becomes possible to increase the surplus power by the amount of the suppression. Therefore, the first embodiment is excellent in two points: it can improve the adverse effect on the battery section 110 and the circuit section due to the flow of an excessive starting current, and it can also increase surplus power.

(12) In the first embodiment, a pulsating current is applied to the terminals of the battery section 110 to obtain the internal impedance of the battery section 110. Based on this internal impedance, it becomes possible to diagnose the deterioration of the battery section 110. By performing this deterioration diagnosis together with the load test, it can be determined whether the result (failure) of the load test is due to deterioration of the battery section 110 or not. If the cause is deterioration of the battery section 110, it is determined that the battery section 110 needs to be replaced.

On the other hand, if the load test fails even though there is not much deterioration, it is possible to take measures such as investigating failures in components other than the battery section 110. Therefore, the first embodiment is excellent in that the person in charge can more precisely judge (separate) the results of the load test by detecting the internal impedance.

Furthermore, by determining the internal impedance, it is possible to accurately estimate the power loss of the battery section 110 due to the internal impedance, and therefore it is possible to accurately correct the surplus power.

Next, a second embodiment will be described in which a plurality of power storage stations X1 to Xn are integrated into a virtual power station. In addition, in Example 2, in order to simplify the explanation, the notation of subscripts 1 to n may be omitted as appropriate.

<<Configuration of Example 2>>
FIG. 11 is a block diagram illustrating a schematic configuration of the second embodiment.
In FIG. 11, the second embodiment is schematically configured to include a power supply system 300 and a resource aggregator 500 (including a power wholesale market).

The power supply system 300 further includes a distributed energy resource 310 and an information section 320.

The distributed energy resource 310 includes power storage stations X1 to Xn that are placed in each of the distributed areas P1 to Pn, facilities Z1 to Zn that receive power from the power storage stations X1 to Xn during a power outage, and power storage stations X1 to Xn. A power receiving system 210 and a separate power system 220 are provided, respectively.

Power storage stations X1 to Xn have the same internal configuration as power storage station X (power supply system 100) in FIG. 1. These internal configurations will be described with the same reference numerals as those in the first embodiment, without repeating the explanations in the first embodiment.

The power receiving system 210 and separate system 220 that are installed for each power storage station X1 to Xn are installed for each region, so even if it becomes possible to transmit power between neighboring regions, mutual power transmission becomes impossible once they are separated by a certain distance. Become.

The information unit 320 has a function of remotely collecting information regarding surplus power required by the surplus detection unit 155 for the battery units 110 in the power storage stations X1 to Xn, and providing the information to the resource aggregator 500 as information on the distributed energy resources 310. .

Further, the information unit 320 has a function of managing information on the location areas P1 to Pn of the power storage stations X1 to Xn (each battery unit 110), and a function of acquiring disaster information. When the information unit 320 acquires information about the disaster area D based on the disaster information, the information unit 320 selects the battery unit 110 located in an area P (hereinafter referred to as "safe area SS") that is different from the disaster area D. The information unit 320 provides the resource aggregator 500 with information regarding the surplus power of the battery units 110 in these safe areas SS as information on the distributed energy resources 310 in the safe areas SS.

Furthermore, the information unit 320 has a function of managing information on power transmission areas for the power storage stations X1 to Xn (each battery unit 110). When the information unit 320 acquires information about the disaster area D based on the disaster information, the information unit 320 includes at least a part of the disaster area D in the power transmission area and located in an area P (hereinafter referred to as "auxiliary area SA") that is different from the disaster area D. A certain battery section 110 is selected. The information unit 320 provides the resource aggregator 500 with information regarding the surplus power of the battery units 110 in these auxiliary areas SA as information on the distributed energy resources 310 that can supply power to the disaster area D.

《Operation 3: Virtual power plant mode operation》
Next, the operation of the virtual power plant mode according to the second embodiment will be explained. In the description here, in order to clarify the subject of each operation, the operation corresponding to the "〇△ step" of the power supply method will be described as the operation with the "〇△ part" as the main body.

12 and 13 are flowcharts illustrating the operation of the virtual power plant mode.
This operation will be described below in accordance with the step numbers shown in FIGS. 12 and 13.

Step S201: The power storage stations X1 to Xn remotely perform a load test mode (see Embodiment 1) in which the separate system 220 is used as a simulated load at an arbitrary timing (such as a schedule). Here, the power storage station X that has failed the load test is temporarily removed from the distributed energy resources 310 because additional maintenance is required.

Step S202: The information unit 320 collects information on the current surplus power from the power storage stations X1 to Xn through remote communication.

Step S203: The information unit 320 stores the surplus power of the power storage stations X1 to Xn in a distributed manner in accordance with the data specifications requested by the resource aggregator 500 (for example, in combination with the information on the location P and the information on the power transmission area). An information group of energy resources 310 is generated.

Step S204: The information unit 320 provides the generated information group of the distributed energy resources 310 to the resource aggregator 500 as power information that can be adjusted at high speed.

Step S205: The resource aggregator 500 plans power supply and demand adjustment for each location P1 to Pn based on the information group of the distributed energy resource 310. Resource aggregator 500 generates a power supply command for each power storage station X1 to Xn based on this supply and demand adjustment, and provides it to information unit 320. The information unit 320 remotely outputs the received power supply command to each of the corresponding power storage stations X1 to Xn.

Step S206: In response to the power supply command, the normal power supply unit 130 of the power storage station X supplies power from the battery unit 110 to the power transmission destination of the separate system 220, while limiting it to the range defined by the surplus power.

If a power outage occurs in the equipment Z at this time, the power supply unit 120 during a power outage switches to autonomous operation (same as in the first embodiment), giving priority to power supply from the battery unit 110 to the equipment Z. The information unit 320 notifies the resource aggregator 500 to that effect.

Step S207: The information unit 320 accesses an information source such as the Japan Meteorological Agency or a police station via a communication network or the like, and obtains disaster-related information regarding the areas P1 to Pn where the power storage stations X1 to Xn are located.

Step S208: Upon acquiring disaster information (information regarding the occurrence of a disaster) for the location P of any of the power storage stations X1 to Xn, the information unit 320 advances the operation to step S211. On the other hand, if disaster information is not acquired for the location areas P1 to Pn, the information unit 320 returns the operation to step S201.

Step S211: The information unit 320 switches the power storage station X corresponding to the disaster area D of the current disaster information to the autonomous operation mode (same as in the first embodiment) and notifies the resource aggregator 500 to that effect.

Step S212: The information unit 320 sequentially collects information on the current surplus power from the power storage stations X1 to Xn by remote communication.

Please note that in the event of a disaster, there may be areas where communication is unavailable. Therefore, the information unit 320 treats the area P where the power storage station X that cannot communicate is located as a disaster area D (that is, an area where a communication failure has occurred due to the disaster). Note that the power storage station X that cannot communicate with the information unit 320 is automatically switched to the autonomous operation mode (same as in the first embodiment).

Step S213: The information unit 320 selects the power storage station X (battery unit 110) in the safe area SS by excluding the power storage station X (battery unit 110) that corresponds to the disaster area D from the distributed energy resources 310. .

Step S214: The information unit 320 searches for power storage stations X in the safe area SS whose power transmission area (power transmission destination) of the separate system 220 corresponds to at least a part of the disaster area D, and The area P where X is located is selected as the auxiliary area SA. The auxiliary area SA selected in this way is an area in the safe area SS where power can be transmitted to the disaster area D.

Step S215: The information unit 320 generates an information group of the distributed energy resources 310 so that the classification of safe area SS/auxiliary area SA/disaster area D can be known.

FIG. 14 is a schematic diagram showing the divisions of safe area SS/auxiliary area SA/disaster-stricken area D in the form of a map.

Step S216: The information unit 320 provides the generated information group of the distributed energy resource 310 to the resource aggregator 500 as power information that can be adjusted at high speed.

Step S217: The resource aggregator 500 plans power supply and demand adjustment for each classification of safe area SS/auxiliary area SA/disaster area D based on the information group of the distributed energy resource 310. Resource aggregator 500 generates a power supply command based on supply and demand adjustment and provides it to information unit 320 . The information unit 320 remotely distributes the received power supply command to each of the corresponding power storage stations X.

Step S218: The normal power supply unit 130 of the power storage station Electric power is supplied from the unit 110 to a power transmission destination of a separate system 220.

If a power outage occurs in the equipment Z at this time, the power supply unit 120 during a power outage prioritizes power supply from the battery unit 110 to the equipment Z and switches to the autonomous operation mode (same as in the first embodiment). The information unit 320 notifies the resource aggregator 500 to that effect.

Step S219: The information unit 320 accesses an information source such as the Japan Meteorological Agency or a police station via a communication network or the like, and obtains disaster-related information regarding the areas P1 to Pn where the power storage stations X1 to Xn are located.

Step S220: The information unit 320 determines whether or not lifelines have completely recovered for the locations P1 to Pn based on disaster-related information. If the lifeline has fully recovered, the information unit 320 returns the operation to step S201. On the other hand, if the lifeline has not completely recovered, the information unit 320 returns the operation to step S211. Note that this operation may be performed by human judgment.

By appropriately repeating the above-described series of operating procedures, the power supply system 300 realizes virtual power plant mode operation.

《Effects of Example 2》
In addition to the effects of the first embodiment described above, the second embodiment provides the following effects.

(1) If the backup power source (including backup generator) that is conventionally installed in case of a power outage at Facility Z is replaced with power storage station X, virtual power plants (distributed energy resource 310). The second embodiment is excellent in that even if it becomes such a large-scale virtual power plant, each power storage station X can guarantee autonomous operation as a backup power source in the event of a power outage.

(2) In the second embodiment, remote operation in load test mode is performed for each power storage station X according to the schedule. Therefore, the second embodiment is excellent in that even if it becomes a large-scale virtual power plant, the load test of each power storage station X can be carried out without exception.

(3) In the second embodiment, a safe area SS excluding the disaster area D is selected according to the disaster information. Information regarding the surplus power of the power storage station X (battery section 110) in the safe area SS is provided to the resource aggregator 500 as information on the distributed energy resources 310 in the safe area SS. Therefore, the second embodiment is excellent in that surplus power can be reliably secured in the safe area SS even in the event of a disaster where power demand is tight.

(4) In the second embodiment, an auxiliary area SA that can transmit power to the disaster area D is selected within the safe area SS in accordance with disaster information. Information regarding the surplus power of power storage station X (battery unit 110) in these auxiliary areas SA is provided to the resource aggregator 500 as information on the distributed energy resources 310 in the auxiliary area SA. Therefore, the second embodiment is excellent in that it is possible to reliably secure surplus power in the auxiliary area SA that can be transmitted to the disaster area D.

(5) Particularly in the second embodiment, the power storage station X in the disaster area D is switched to the autonomous operation mode in accordance with disaster information. Therefore, the second embodiment is superior in that the power storage station X operates autonomously in the disaster area D without remote control by the information unit 320.

《Supplementary information regarding the embodiment》
In addition, in the embodiment mentioned above, the equipment Z with three-phase AC input was explained. However, the present invention is not limited thereto. For example, it may be applied to equipment Z with DC input or single-phase AC input.

Furthermore, the above-described embodiments are based on a system in which there is little need to consider the discharge time rate, such as a lithium ion battery. However, the present invention is not limited thereto. For example, for the battery unit 110 such as a lead-acid battery that requires consideration of the time rate of discharge, the load test unit 150 (discharge calculation unit 152 or discharge pattern conversion unit 153, etc.) supplies power while taking the time rate of discharge into consideration. Quantity conversion may also be performed.

Furthermore, in the embodiment described above, the power supply unit 120 during a power outage and the power supply unit 130 during a normal time are described as independent functions. However, the power supply unit 120 during a power outage and the power supply unit 130 during a normal time may be functionally integrated and integrated.

Furthermore, in the above-described embodiment, a load test was explained assuming legal operating time as one of the guaranteed operating times. However, the present invention is not limited thereto. For example, a load test may be performed for a guaranteed driving time that is the legal driving time plus an allowance. For example, if legal operating hours are not particularly determined, a load test may be conducted for guaranteed operating hours established by the industry or voluntarily.

Furthermore, in the embodiments described above, a case has been described in which a storage battery such as a lithium ion assembled storage battery is used as the battery section 110. However, the battery unit 110 of the present invention may be any battery that can be used as a backup power source for the equipment Z. For example, the battery unit 110 may be a fuel cell that recovers power by supplying fuel.

Furthermore, the above-described embodiment has been described assuming that the battery unit 110 is of a stationary type. However, the present invention is not limited thereto. A portable battery for a train, automobile, ship, airplane, mobile device, or the like may be employed in the battery section 110 as a backup power source. In that case, it is preferable that the information unit 320 manages the location information (location area P and power transmission area) of the portable battery unit 110 using a GPS system or the like.

In particular, the present invention is not limited to the contents of the embodiments described above, and various modifications are possible.

For example, the embodiments described above are described in detail as a whole in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the parts, configurations, functions, steps, and data structures described. .

Furthermore, individual elements of the embodiments may be combined as appropriate. Furthermore, it is also possible to add, delete, or replace other configurations or steps with respect to the embodiments.

DESCRIPTION OF SYMBOLS 100... Power supply system, 110... Battery part, 110a... Pulsating current measurement part, 120... Power supply part at the time of a power outage, 130... Normal time power supply part, 140A-B... Normal time detection part , 150... Load test section, 151... Simulation power outage section, 152... Discharge calculation section, 153... Discharge pattern conversion section, 154... Abnormality determination section, 155... Surplus detection section, 160A-B... Starting current suppressor, 170... Charge/discharge control unit, 180... Three-phase/DC converter, 190... Three-phase inverter, 210... Power receiving system, 220... Separate Grid, 300...Power supply system, 310...Distributed energy resource, 320...Information department, 500...Resource aggregator, D...Disaster area, P...Location area, P1 to Pn ...location area, SA...auxiliary area, SS...safety area, X...power storage station, X1~Xn...power storage station, Z...equipment, Z1~Zn...equipment

Claims (12)

A power supply system that controls a battery unit that is a backup power source for equipment,
a power supply unit for supplying power from the battery unit to the equipment during a power outage;
a normal time power supply unit that supplies power from the battery unit to a power system separate from the equipment (hereinafter referred to as “separate system”) during normal times;
a load test unit that performs a load test of the battery unit using the separate system as a simulated load in preparation for the power outage to simulate driving of the equipment during the guaranteed operating time;
A power supply system characterized by comprising: The power supply system according to claim 1,
The load test section acquires information on the amount of power supplied from the battery section to the other system, and performs the load test on the battery section using the other system as a simulated load in preparation for the power outage. A power supply system characterized in that driving of the equipment during the guaranteed operating time is simulated by converting the power supply amount based on the difference between the load and the load of the equipment. The power supply system according to claim 1,
The load test section includes:
a simulating power outage section that causes a simulated power outage state by stopping the power recovery operation of the battery section over the period of the load test;
a discharge calculation unit that acquires information over time about the value of the discharge current or charge amount from the battery unit to the other system in the simulated power outage state;
Discharge pattern conversion for confirming whether or not the guaranteed operating time of the equipment is reached by converting the value obtained by the discharge calculation unit over time into a discharge current pattern necessary for operating the equipment. An electric power supply system comprising: The power supply system according to claim 3,
The load test section includes an abnormality determination section that determines whether the battery section is normal or abnormal in the load test,
The abnormality determination section determines whether the battery is normal or abnormal at least one of the following: electrical characteristics of the battery, liquid leakage, swelling (deformation), abnormal odor, irregular sounds (abnormal sounds), abnormal vibrations, and abnormal heat generation. A power supply system characterized by making a determination. The power supply system according to claim 1,
The load test section includes a surplus detection section that determines surplus power remaining in the battery section after the load test,
The power supply system is characterized in that the normal power supply unit supplies power from the battery unit to the other system within a range defined by the surplus power determined by the surplus detection unit. The power supply system according to claim 5,
comprising a starting current suppressor that suppresses a starting current of the equipment,
The power supply system is characterized in that the starting current suppressor increases the surplus power by reducing the power required to start the equipment. The power supply system according to claim 5,
comprising a pulsating current measurement unit that applies a pulsating current to a terminal of the battery unit to measure the internal impedance of the battery unit,
The power supply system is characterized in that the load test section diagnoses deterioration of the battery section based on the internal impedance determined by the pulsating current measurement section. The power supply system according to any one of claims 5 to 7,
an information unit that collects information regarding the surplus power sought by the surplus detection unit for at least one or more battery units, and provides the information to a resource aggregator as distributed energy resource information;
The normal power supply unit controls power supply from the battery unit to the other system by limiting it to a range defined by the surplus power in response to a command regarding power supply from the resource aggregator,
The power supply unit during a power outage gives priority to supplying power from the battery unit to the equipment during the power outage.
A power supply system characterized by: The power supply system according to claim 8,
The information unit has a function of managing information on the location area of the battery unit and a function of acquiring disaster information, and when information on the disaster area is acquired based on the disaster information, the information unit includes a function of managing information on the location area of the battery unit and a function of acquiring disaster information. (hereinafter referred to as a "safe area"), and providing information regarding the surplus power of the battery unit in the safe area to the resource aggregator as information on the distributed energy resource in the safe area. A power supply system featuring: The power supply system according to claim 8,
The information unit has a function of managing information regarding the location area and power transmission area for the battery unit, and a function of acquiring disaster information, and when acquiring information about the disaster area based on the disaster information, transfers the disaster area to the power transmission area. and the battery units located in the area (hereinafter referred to as "auxiliary area") that is different from the disaster-stricken area and are located in the area (hereinafter referred to as "auxiliary area"), and information regarding the surplus power of the battery unit in the auxiliary area is transmitted to the disaster-stricken area. An electric power supply system characterized in that the information is provided to the resource aggregator as information about the distributed energy resource capable of supplying electric power. The power supply system according to claim 1,
The equipment is driven preferentially during the power outage, and includes sprinklers, fire pumps, fire extinguishing equipment, elevators, water supply pumps, sewage pumps, information and communication equipment, telephone exchanges, hospital equipment, nursing care facility equipment, and evacuation equipment. An electric power supply system characterized by being at least one of the group consisting of equipment at a disaster power supply center and equipment at a disaster supply center. A power supply method for controlling a battery unit that is a backup power source for equipment, the method comprising:
a power supply step for supplying power from the battery unit to the equipment during a power outage;
a normal time power supply step of supplying the power of the battery unit to a power system different from the equipment (hereinafter referred to as "separate system") during normal times;
a load test step of performing a load test on the battery unit using the separate system as a simulated load in preparation for the power outage to simulate driving the equipment during a guaranteed operating time;
A power supply method characterized by comprising:

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