Energy storage control device, distributed energy storage control system, energy storage control method, computer program

Abstract

To provide a power storage control device capable of leveling the remaining battery power of a distributed power source that has a plurality of storage batteries and can charge and discharge, and making full use of the storage capacity and chargeable and dischargeable power of each distributed power source.SOLUTION: A power storage control device includes: a communication unit capable of receiving distributed power source information, including information on the remaining battery capacity of storage batteries, transmitted from a plurality of distributed power sources having storage batteries connectable to a grid power source, and information on load power, which is the sum of the generated power, charged / discharged power, and consumed power of load elements, power generation elements, storage elements, etc., other than the plurality of distributed power sources, connected to the grid power source within the facility where the plurality of distributed power sources is installed; and a processing unit that transmits charge / discharge commands to each distributed power source via the communication unit to instruct the storage battery of each distributed power source to charge or discharge according to the remaining battery capacity, based on the received distributed power source information including the information on the remaining battery capacity, the information on load power, and a target value for grid power maintained according to the purpose.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006] , ,

[0001] The present disclosure relates to a power storage control device, a distributed power storage control system, a power storage control method, and a computer program.

Background Art

[0002] In recent years, the utilization of distributed power sources that utilize distributed energy sources such as renewable energy or storage batteries has been promoted (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a system in which a plurality of distributed power sources having storage batteries are connected, there is a technical problem that the storage capacity and charge / dischargeable power of each distributed power source cannot be fully utilized.

[0005] An object of the present disclosure is to provide a power storage control device, a distributed power storage control system, a power storage control method, and a computer program that can fully utilize the storage capacity and charge / dischargeable power of each distributed power source.

Means for Solving the Problems

[0006] A power storage control device relating to one aspect of this disclosure includes a communication unit capable of receiving information relating to a plurality of rechargeable distributed power sources having batteries connectable to a grid power source, including the remaining charge of the batteries, and information relating to load power, which is the sum of generated power, charge / discharge power, and power consumption of load elements, power generation elements, power storage elements, etc. connected to the grid power source other than the plurality of distributed power sources, located within a facility where the plurality of distributed power sources are installed; and a processing unit that performs processing for controlling the plurality of distributed power sources. The processing unit determines a target value for total charge / discharge power, which is the sum of the individual charge power or discharge power of the plurality of distributed power sources, based on the acquired information relating to load power and a target value of grid power to be held according to the purpose. Based on the information relating to the distributed power sources, including the remaining charge of the batteries, received by the communication unit and the determined target value for total charge / discharge power, it creates a charge / discharge command to instruct charging and discharging, and has the communication unit transmit the created charge / discharge command to each distributed power source.

[0007] A power storage control device relating to one aspect of this disclosure includes a communication unit that receives information relating to a plurality of rechargeable distributed power sources having batteries that can be connected to a grid power source, including the remaining charge of the batteries, transmitted from the plurality of distributed power sources, and a processing unit that performs processing for controlling the plurality of distributed power sources. The processing unit acquires information relating to grid power between the facility where the plurality of distributed power sources are installed and the grid power source, and information relating to total charge / discharge power, which is the sum of the individual charge power or discharge power of the plurality of distributed power sources. Based on the acquired information relating to grid power, the target value of grid power to be maintained according to the purpose, and the information relating to total charge / discharge power, the processing unit determines a target value for total charge / discharge power. Based on the information relating to the distributed power sources, including the remaining charge of the batteries, received by the communication unit and the determined target value of total charge / discharge power, the processing unit creates a charge / discharge command to instruct charging and discharging, and has the communication unit transmit the created charge / discharge command to each distributed power source. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide an energy storage control device, a distributed energy storage control system, an energy storage control method, and a computer program that can fully utilize the energy storage capacity and chargeable / dischargeable power of each distributed power source. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram illustrating an example configuration of a distributed energy storage control system according to Embodiment 1. [Figure 2] This block diagram shows an example of a distributed power source configuration. [Figure 3] This is an explanatory diagram showing the charge state and capacity of the battery according to Embodiment 1. [Figure 4] This flowchart shows the processing procedure for charge and discharge control according to Embodiment 1. [Figure 5] This flowchart shows the processing procedure for creating charge and discharge commands according to Embodiment 1. [Figure 6] This is a conceptual diagram showing the relationship between the maximum charge / discharge power and the set value of the charge / discharge power. [Figure 7] This is a conceptual diagram illustrating a method for leveling out the remaining energy storage capacity. [Figure 8] This is a conceptual diagram showing a state where the remaining energy storage capacity is leveled out. [Modes for carrying out the invention]

[0010] Energy storage control devices, distributed energy storage control systems, energy storage control methods, and computer programs according to embodiments of this disclosure will be described below with reference to the drawings. This disclosure is not limited to these examples, but is intended to include all modifications within the meaning and scope of the claims as indicated by the claims. Furthermore, at least some of the embodiments described below may be combined in any way.

[0011] <Distributed power system> Figure 1 is a schematic diagram illustrating an example configuration of a distributed energy storage control system according to Embodiment 1, and Figure 2 is a block diagram illustrating an example configuration of a distributed power source 1. The distributed energy storage control system according to Embodiment 1 comprises a plurality of distributed power sources 1 installed in a facility T such as an apartment building, office building, or factory, and an energy storage control device 2 that controls charging and discharging by each distributed power source 1. The energy storage control device 2 aims to equalize the battery levels of the plurality of distributed power sources 1 and optimizes the power supply and demand at the facility T by making full use of the storage capacity and chargeable / dischargeable power of each distributed power source 1, thereby enabling, for example, the maximum utilization of renewable energy. Battery levels can include remaining storage capacity, dischargeable capacity, etc. (see Figure 3), but in this embodiment, the equalization of remaining storage capacity will be explained as an example. Facility T is a facility connected to the grid power supply 3, which is equipped with multiple distributed power sources 1, each having a battery 12 that can be connected to the grid power supply 3. Furthermore, the point on the power circuit at facility T that receives power from grid power source 3 is the power receiving point. In Figure 1, the location where the power sensor 24 is installed is the power receiving point. Facility T can receive power from grid power source 3 through this point (forward power flow), and facility T can also supply power to grid power source 3 through this point (reverse power flow). Furthermore, in this disclosure, the absorption of power from the on-site circuit by the distributed power source 1 is referred to as charging, and the release of power from the distributed power source 1 to the on-site circuit is referred to as discharging. Also, the power generated by charging is called charging power, the power generated by discharging is called discharging power, and when both are referred to together, they are called charge-discharge power. If the distributed power source 1 contains only a storage battery 12, these terms may be replaced with charging and discharging of the storage battery 12. In the case of a hybrid energy storage system, where the distributed power source 1 has both a battery 12 and a generator, the combined output of the power generated by the generator and the power charged and discharged from the battery 12 becomes the power charged and discharged from the distributed power source 1. Furthermore, the signs of each quantity are as follows: Grid power: Forward power flow is considered positive, and reverse power flow is considered negative. The charge / discharge power (total charge / discharge power) of each distributed power source 1: Charge is considered positive, and discharge is considered negative. Load power: Assume positive.

[0012] The distributed power source 1 is, for example, a hybrid power storage system having a communication function. As shown in FIG. 1, it includes a solar power generation panel 11, a storage battery 12, and a power source communication unit 13. Specifically, as shown in FIG. 2, the distributed power source 1 includes a control circuit 10, a solar power generation panel 11, a PV converter 11a, a storage battery 12, a storage battery converter 12a, a power source communication unit 13, an inverter circuit 14, relays 15, 16, 17, a remaining battery level detection IC 18, and a power sensor 19. The grid power source 3 includes not only the commercial grid power supplied by the power company, but also the power supply sources provided in the microgrid system and other power supply sources.

[0013] The solar power generation panel 11 includes a plurality of solar cells that convert solar energy into electric power and output it. The plurality of solar cells are connected in series or in parallel. The PV converter 11a is a circuit that converts the output voltage of the solar power generation panel 11 into a DC voltage of a predetermined voltage value.

[0014] The storage battery 12 is a secondary battery such as a lithium-ion battery. Note that the type of the storage battery 12 is not limited, and other secondary batteries such as nickel-metal hydride batteries and NAS batteries may also be used. The storage battery converter 12a is a circuit that charges and discharges the storage battery 12. When the storage battery 12 is charged, the storage battery converter 12a adjusts the current value or voltage value of the DC power converted from the AC power supplied from the grid power source 3 by the inverter circuit for charging the storage battery 12. Also, the PV converter 11a adjusts the current value or voltage value of the DC power supplied from the solar power generation panel 11 to charge the storage battery 12. Further, when the storage battery 12 discharges, the storage battery converter 12a adjusts the DC current value and voltage value discharged from the storage battery 12 to conform to the inverter circuit 14 and outputs it.

[0015] FIG. 3 is an explanatory diagram showing the state of charge and capacity of the storage battery 12 according to Embodiment 1. Here, terms related to the capacity of the storage battery 12 will be explained. The rated power amount (Wh) shown in FIG. 3 means the power amount that the storage battery 12 can store under specified conditions. The effective capacity (Wh) means the power amount that the storage battery 12 can actually charge or discharge. The remaining charge amount (Wh) means the power amount that the storage battery 12 stores and can actually discharge. The chargeable capacity (Wh) and the dischargeable capacity (Wh) mean the power amount obtained by subtracting a predetermined power amount for power outage from the effective capacity. The dischargeable amount (Wh) means the power amount obtained by subtracting a predetermined power amount for power outage from the remaining charge amount. The chargeable amount (Wh) means the power amount obtained by subtracting the dischargeable amount from the chargeable capacity.

[0016] The inverter circuit 14 is a circuit that converts electric power bi-directionally between AC and DC between the solar power generation panel 11, the storage battery 12, and the on-site circuit. Note that the on-site circuit is a circuit that connects from the power reception point to the inside of the facility T. A plurality of distributed power sources 1 and other plurality of load elements, power generation elements, power storage elements, etc. included in the facility T can be connected to the circuit.

[0017] Specifically, the inverter circuit 14 converts the DC power output from the PV converter 11a and the battery converter 12a into AC power, and outputs the converted AC power to the on-site circuit. When the discharge power exceeds the sum of the charge power and the consumption power in the total of the AC power output from the inverter circuit 14 and the charge / discharge power and consumption power of other distributed power sources 1, load A, and other generators, power storage systems, loads, etc. on the on-site circuit, a reverse power flow of power occurs from the facility T to the grid power source 3. When the discharge power is less than the sum of the charge power and the consumption power, a forward power flow of power occurs from the grid power source 3 to the facility T.

[0018] Also, the inverter circuit 14 converts the AC power input from the on-site circuit into DC power and outputs it to the battery converter 12a. The battery converter 12a charges the storage battery 12 using the DC power output from the inverter circuit 14.

[0019] Relay 15 is a circuit that opens and closes the circuit between the on-site power circuit and distributed power source 1, relay 16 is a circuit that opens and closes the circuit between the on-site power circuit and load A, and relay 17 is a circuit that opens and closes the circuit between distributed power source 1 and load A. When connecting to the grid, etc., by closing relays 15 and 16 and opening relay 17, distributed power source 1 and load A can be connected to the on-site power circuit. Also, when there is a power outage, etc., by opening relays 15 and 16 and closing relay 17, distributed power source 1 and load A can be disconnected from the on-site power circuit, and power from distributed power source 1 will be supplied to load A in a self-sustaining operation mode. Note that in both Figure 1 and Figure 2, load A is depicted as being connected to distributed power source 1, but when connected to the grid, load A will be connected to the on-site power circuit due to the opening and closing of the relays as described above.

[0020] The remaining charge detection IC 18 calculates the remaining charge of the battery 12 based on information obtained from the battery state detection sensor 17a for detecting the state of the battery 12, and outputs information indicating the calculated remaining charge to the control circuit 10. The battery state detection sensor 17a is, for example, a voltage sensor for detecting the output voltage of the battery 12, a current sensor for detecting the current input and output to the battery 12, a temperature sensor, etc. The remaining charge detection IC 18 calculates the remaining charge using the detected voltage or current and the temperature. For example, the remaining charge detection IC 18 calculates the remaining charge using a method such as a voltage measurement method, a Coulomb counter method, a battery cell modeling method, or an impedance track method. Note that the remaining charge detection IC 18 may be configured to calculate the remaining charge without using temperature information if a temperature sensor is not provided.

[0021] Although an example with a remaining charge detection IC 18 has been described, the control circuit 10 may also be configured to detect the voltage or current and temperature of the battery 12 using the battery state detection sensor 17a and calculate the remaining charge of the battery 12. Alternatively, the control circuit may be configured to calculate the remaining charge without using temperature information.

[0022] The power sensor 19 is a sensor that outputs an analog signal corresponding to the magnitude and direction of the power flowing between a distributed power source 1 and load A, and the internal power circuit, on which the power sensor 19 is installed. The control circuit 10 detects the power supplied between the distributed power source 1 and the grid power source 3 by receiving the analog signal output from the power sensor 19. The power sensor 19 may also detect the magnitude and direction of power by detecting the magnitude and direction of the current, assuming that the voltage is constant.

[0023] The power supply communication unit 13 is a communication circuit for transmitting various information to and from the energy storage control device 2. Specifically, the power supply communication unit 13 transmits the identifier of the distributed power supply 1 and information related to the distributed power supply 1 (hereinafter referred to as distributed power supply information) to the energy storage control device 2 in accordance with the control circuit 10. The distributed power supply information includes, for example, the identifier of the distributed power supply 1, the remaining charge of the battery 12, and the maximum charge / discharge power that the distributed power supply 1 can charge / discharge (hereinafter referred to as maximum charge / discharge power). The maximum charge / discharge power may be obtained from the distributed power supply information or calculated based on information obtained from the distributed power supply information, or the rated charge / discharge power of the distributed power supply 1 may be used. The method of expressing the remaining charge is not particularly limited, and it may be a value that can be calculated by calculation, such as the ratio of the dischargeable amount to the dischargeable capacity. In other words, it is sufficient if it substantially indicates the remaining charge. Furthermore, the power communication unit 13 receives charge and discharge commands transmitted from the energy storage control device 2. The control circuit 10 controls the operation of the battery converter 12a in accordance with the charge and discharge commands received by the power communication unit 13, thereby charging or discharging the battery 12. The distributed power source information is information related to each distributed power source 1 that each distributed power source 1 transmits to the energy storage control device 2. For example, this information includes the identifier of the distributed power source 1, the remaining charge of the battery 12, the maximum charge / discharge power that the distributed power source 1 can charge / discharge (hereinafter referred to as the maximum charge / discharge power), and the current charge / discharge power.

[0024] The control circuit 10 is a processor that includes arithmetic circuits such as a CPU (Central Processing Unit), a multi-core CPU, and an FPGA (Field-Programmable Gate Array), as well as volatile memory, non-volatile memory, and a timing unit. The non-volatile memory stores an identifier for identifying the distributed power source 1, the effective capacity of the battery 12, the set power for power outages, the charge / discharge capacity, the discharge capacity, the discharge amount, and the charge amount. The control circuit 10 controls the operation of the PV converter 11a, the battery converter 12a, the inverter circuit 14, and the power communication unit 13, and also controls the switching of relays 15, 16, and 17 to control charging and discharging by the distributed power source 1. By controlling the operation of the PV converter 11a and the inverter circuit 14, the control circuit 10 can supply the power generated by the solar power generation panel 11 to the on-site power circuit. In addition, the control circuit 10 can charge the battery 12 by controlling the operation of the battery converter 12a. Furthermore, the control circuit 10 can discharge the battery 12 and supply the discharged power to the on-site power lines by controlling the operation of the battery converter 12a and the inverter circuit 14. The control circuit 10 controls the charging and discharging of the battery 12 according to purposes such as self-consumption, reverse power supply prevention, peak shifting, and power plant output limiting and leveling. In addition, the control circuit 10 can recognize the status of the battery 12, such as the remaining charge, by acquiring information output from the remaining charge detection IC 18. The control circuit 10 can send and receive various information with the power storage control device 2 by controlling communication by the power communication unit 13. Furthermore, the control circuit 10 may receive charge / discharge commands to the distributed power supply 1 from the power communication unit 13 and control the operation of the battery converter 12a to charge or discharge the battery 12, or it may control the operation of the inverter circuit 14 to charge or discharge the battery 12 via the battery converter 12a.

[0025] In the above explanation, a hybrid energy storage system was mainly described as an example of a distributed power source 1, but any configuration with a generator and battery 12 that are smaller in scale than grid power sources 3 is sufficient. For example, the distributed power source 1 may be a renewable energy power generation system such as a wind power generation system, a hydroelectric power generation system, a biomass power generation system, or a geothermal power generation system, or it may be a power generation system that utilizes fossil fuels, a power generation system that utilizes hydrogen energy, or a hybrid energy storage system that incorporates these.

[0026] Furthermore, as an example of a distributed power source 1, a configuration was described in which a PV converter 11a and a battery converter 12a are connected, and the battery 12 can be charged with DC power generated by the solar power generation panel 11. However, the distributed power source 1 may not have solar power generation panels 11 and a PV converter 11a, and may be an AC link type configuration in which a generator such as a solar power generation device is separately connected to the on-site power circuit.

[0027] Furthermore, Figure 1 shows an example where all power sources connected to the energy storage control device 2 are distributed power sources 1 that have both power generation and energy storage functions. However, it is also possible to have a configuration where power sources with only power generation functions or only energy storage functions are further connected. Furthermore, although we have described an example in which load A is connected to the on-site power circuit via distributed power source 1, load A may also be directly connected to the on-site power circuit, and load A does not necessarily have to correspond one-to-one with distributed power source 1. Furthermore, the configuration may also include multiple generators, batteries, or loads that are not connected to the energy storage control device 2 but are connected to the on-site electrical circuit.

[0028] The energy storage control device 2 is a computer that implements the energy storage control method according to Embodiment 1, and comprises a processing unit 21, a storage unit 22, and a communication unit 23, with each unit connected by a bus.

[0029] The processing unit 21 is a processor that includes arithmetic circuits such as a CPU (Central Processing Unit), a multi-core CPU, and an FPGA (Field-Programmable Gate Array), internal storage devices such as ROM (Read Only Memory) and RAM (Random Access Memory), a timing unit, and an AD conversion circuit 21a. The processing unit 21 implements the energy storage control method according to this embodiment 1 by executing a computer program (program product) P stored in the storage unit 22, which will be described later. Note that each functional unit of the energy storage control device 2 may be implemented in software, or some or all of them may be implemented in hardware.

[0030] The AD conversion circuit 21a of the processing unit 21 is connected to a power sensor 24 that outputs an analog signal corresponding to the magnitude and direction of the power flowing between the facility T where multiple distributed power sources 1 are installed and the grid power source 3. The power sensor 24 may consist of a current sensor and a voltage sensor. The AD conversion circuit 21a converts the analog signal output from the power sensor 24 into a digital signal. The processing unit 21 detects the grid power supplied between the facility T and the grid power source 3 using the AD conversion circuit 21a. The facility T includes, for example, multiple distributed power sources 1, a power storage control device 2, and a load A, as shown in Figure 1. Furthermore, the on-site electrical circuits within the facility T may also be connected to multiple other generators, power storage devices, or loads that are not connected to the power storage control device 2. Note that grid power refers to the power at the point of power reception. The sign of the power is reversed during forward power flow and reverse power flow. The energy storage control device 2 in Figure 1 acquires the grid power value using the power sensor 24.

[0031] The storage unit 22 includes, for example, a main storage unit and an auxiliary storage unit. The main storage unit is a temporary storage area such as SRAM (Static Random Access Memory), DRAM (Dynamic Random Access Memory), or flash memory, and temporarily stores data necessary for the processing unit 21 to perform arithmetic processing. The auxiliary storage unit is a storage device such as a hard disk or EEPROM (Electrically Erasable Programmable ROM). The storage unit 22 stores the computer program P executed by the processing unit 21. The computer program P may be recorded in a readable manner on a recording medium 4 such as a magnetic disk, optical disk, or semiconductor memory, or a reader may read it from the recording medium 4 and store it in the storage unit 22.

[0032] The communication unit 23 is a communication circuit for transmitting various information to and from the distributed power supply 1. Specifically, the communication unit 23 transmits charge / discharge commands to the distributed power supply 1 to instruct the charging and discharging of the battery 12, in accordance with the control of the processing unit 21. The communication unit 23 also receives distributed power supply information transmitted from the distributed power supply 1.

[0033] The energy storage control device 2 may be a computer located in an on-premises environment, or a server or other computer located in a cloud environment. The energy storage control device 2 may be configured with multiple computers for distributed processing, or it may be implemented by multiple virtual machines located within a single server, or it may be implemented using a cloud server. If the energy storage control device 2 is located in a cloud environment or has a distributed processing configuration, it may obtain information from the power sensor 24 by a means of communication other than via the AD conversion circuit.

[0034] <Charge / Discharge Control> Figure 4 is a flowchart showing the charging and discharging control procedure according to Embodiment 1. The energy storage control device 2 sends a transmission command to each of the multiple distributed power sources 1 requesting the transmission of distributed power source information (step S11), and each distributed power source 1 that receives the transmission command detects the state of the battery 12 (step S12). Specifically, the control circuit 10 of the distributed power source 1 detects the remaining charge of the battery 12 using the remaining charge detection IC 18.

[0035] Then, each of the multiple distributed power sources 1 transmits distributed power source information, including the remaining charge of the battery 12, the maximum charge / discharge power, and the charge / discharge power, obtained by monitoring each source, to the energy storage control device 2 via the power communication unit 13 (step S13).

[0036] The energy storage control device 2 receives distributed power information transmitted from the distributed power source 1 via the communication unit 23 (step S14). Then, the processing unit 21 of the energy storage control device 2 acquires information related to grid power using the power sensor 24 and the AD conversion circuit 21a (step S15).

[0037] Next, the processing unit 21 sums up the individual charging power or discharging power of each distributed power source 1 that it has acquired, and calculates the current total charge / discharge power. The total charge / discharge power is the sum of the charging and discharging power of the multiple distributed power sources 1 that the energy storage control device 2 controls. Next, from the acquired grid power information and the total charge / discharge power, it calculates the load power, which is the sum of the generated power, charging and discharging power, power consumption, etc. of load elements, power generation elements, energy storage elements, etc. connected to the grid power source 3, other than the multiple distributed power sources within the facility T. Here, the load power can be expressed by the following formula. Load power = Grid power - Total charging / discharging power In Embodiment 1, the load power is determined from distributed power source information and grid power information, but it may also be measured by other means and received by the energy storage control device 2. Furthermore, while the total charge and discharge power is calculated from distributed power source information, the charge and discharge power of each distributed power source may be measured by other means, such as individually, combined and measured, or combined into several groups and measured, and then received by the energy storage control device 2. Alternatively, the total charge / discharge power may be calculated by summing the charge / discharge command values ​​of each distributed power source in the previous cycle. Furthermore, based on the load power and the target values ​​of the grid power to be maintained according to the purpose of charging and discharging, a target total charge / discharge power value to be charged or discharged for the entire group of distributed power sources 1 is determined (step S16). The target total charge / discharge power value is the target value of the total charge / discharge power and is used to calculate the command value for each distributed power source 1.

[0038] The objectives include, for example, self-consumption, reverse power flow prevention, peak shifting, and power plant output limiting and leveling. Self-consumption aims to maximize the use of electricity generated by the solar power generation panels 11 for consumption at load A, minimizing the purchase of electricity from grid power sources 3. Along with reverse power flow prevention described below, the goal is to keep the forward power flow below a certain level. Reverse power flow prevention aims to prevent reverse power flow by having the distributed power sources 1 charge when reverse power flow is likely to occur. Peak shifting aims to suppress the forward power flow to a predetermined power value or below by having the storage battery 12 charge during periods of low electricity consumption and the distributed power sources 1 discharge during periods of high electricity consumption. Power plant output limiting and leveling aims to maintain output near a certain power value by charging when the generated power exceeds a predetermined power and discharging when the generated power falls below a predetermined power, in order to prevent the power plant from exceeding its contracted output with the power company or to stabilize the output.

[0039] For example, if a discharge is occurring from facility T to grid power source 3 (reverse power flow), and the purpose is self-consumption and prevention of reverse power flow, then simply setting the target value of grid power to 0W, the processing unit 21 can determine the total charge / discharge power value as the power value that cancels out the load power calculated from the current grid power (the value of the power discharged to grid power source 3) and the total charge / discharge power. More practically, considering a margin to reduce the time and magnitude of reverse power flow, the target value of grid power may be set to a power value of a certain magnitude on the forward power flow side rather than 0W.

[0040] When power is being supplied from grid power source 3 to facility T (forward power flow) and the purpose is peak shifting, the target value of grid power should be the peak upper limit power value, and the processing unit 21 should determine the target value of total charge / discharge power by subtracting the current grid power (power value being supplied) and the load power obtained from total charge / discharge power from the said target value.

[0041] Next, the processing unit 21 creates a charge / discharge command to instruct each distributed power supply 1 to charge or discharge based on the distributed power supply information received by the communication unit 23, the grid power target value, and the total charge / discharge power obtained from the grid power information acquired by the power sensor 24 and the AD conversion circuit 21a (step S17). The grid power target value is a target power value of the grid power determined according to the purpose. Details of how to create the charge / discharge command will be described later.

[0042] The grid power target value is set, for example, as follows: In the case of a self-consumption type (prevention of reverse power flow + minimizing forward power flow), the grid power target value is expressed as follows: Grid power target value = Forward power flow buffer value (positive) Even when controlling distributed power sources 1, there are always fluctuations in solar power generation and load, so there will always be some degree of increase or decrease relative to the target value. Therefore, especially when reverse power flow is "prohibited," the target value for grid power is often set with a buffer value that ensures a certain degree of forward power flow in the grid. When setting an upper limit on power plant output and leveling it out, the grid power target value is expressed as follows: Grid power target value = Target power generation (negative) In solar power plants and similar facilities, if the power generation exceeds a specified level under a high-voltage contract, it may be necessary to use a battery 12 to prevent the contract's premise from changing if the generated power exceeds a certain level, and also to level out the generated power to a constant value. By setting it up as described above, surplus power is charged into the battery 12, and insufficient power is discharged from the battery 12 to match the target.

[0043] Then, the processing unit 21 sends the charge / discharge commands for the multiple distributed power sources 1 created in step S16 to each distributed power source 1 (step S18). Each distributed power source 1 receives the charge / discharge command sent from the energy storage control device 2 (step S19), controls the charging and discharging of the battery 12 according to the received charge / discharge command (step S20), and completes the process.

[0044] In Figure 4, the reception period for distributed power information and the acquisition period for grid power are shown to be the same, but these periods may be different. Generally, grid power changes more rapidly on a shorter timescale than distributed power information, so it is preferable to shorten the detection period for grid power in step S15 compared to the reception period for distributed power information. This allows for rapid control of the charging and discharging of the distributed power source 1 in response to the grid power conditions.

[0045] The processes described in steps S11 to S20 are repeatedly executed at predetermined intervals, and the remaining energy storage capacity of the distributed power source 1 is leveled while controlling the grid power appropriately for the purpose.

[0046] Figure 5 is a flowchart showing the processing procedure for creating charge / discharge commands according to Embodiment 1. The processing unit 21 calculates a first set value for the charge / discharge power to be commanded to each distributed power source 1 by proportionally allocating the total charge / discharge power target value determined in step S16 according to the maximum charge / discharge power that each distributed power source 1 can charge / discharge (step S31).

[0047] The first set value is represented, for example, by the following formula (1). If the set value is positive, it indicates the charging power value, and if the set value is negative, it indicates the discharge power value. CDPi_1=TCDP×MaxCDPi / ΣMaxCDPi…(1) however, CDPi_1: First setting value for distributed power supply 1 with identification number i i: Identification numbers (1 to n) of multiple distributed power sources 1 n is the total number of distributed power sources 1. TCDP: Total Charge / Discharge Power Target Value MaxCDPi: Maximum charge / discharge power of distributed power supply 1 with identification number i

[0048] The maximum charge / discharge power used when calculating the first set value may be the value obtained from the distributed power source 1 by steps S12 to S15, or the rated charge / discharge power of the distributed power source 1. If the maximum charge power and maximum discharge power are different values ​​according to the specifications of the distributed power source 1, they may be used for charging and discharging, respectively. In addition, other distribution methods may be used for the total charge / discharge power distribution, as long as they do not exceed the maximum charge / discharge power of each distributed power source 1.

[0049] Next, the processing unit 21 calculates a second set value for the charge / discharge power to command each distributed power source 1 so as to equalize the variation in the remaining charge of the batteries 12 that each distributed power source 1 possesses, based on the distributed power source information (step S32).

[0050] The second setting value is expressed, for example, by the following formula (2). If the setting value is positive, it indicates the charging power value, and if the setting value is negative, it indicates the discharge power value. CDPi_2 = C × (ARC - RCi) ... (2) however, C: predetermined coefficient CDPi_2: Second setting value for distributed power supply 1 with identification number i RCi: Remaining energy storage capacity of distributed power source 1 with identification number i ARC = ΣRCi / n: Average remaining energy storage capacity of distributed power source 1 n: Total number of distributed power sources

[0051] In this case, the sum of CDPi_2 values ​​for all distributed power sources 1 will be 0, and will not affect the sum of CDPi_1 values.

[0052] Furthermore, although it was explained that C is a predetermined coefficient, it may also be a value determined as follows. MaxACDP: The maximum absolute value of (ARC-RCi) for each distributed power source 1. as, (1st method) The coefficient C should be the smallest value obtained by subtracting the first set value of each distributed power source 1 from the maximum charge / discharge capacity of that distributed power source 1 [Min(Maximum charge / discharge capacity of each distributed power source 1 - First set value)] divided by MaxACDP. In the first method, maximum output can be achieved while maintaining the ratio for leveling the remaining energy storage capacity. This method prioritizes leveling speed. (Second method) The coefficient C should be the smallest of the first setting values ​​for each distributed power source 1 [Min(first setting value for each distributed power source 1)] divided by MaxACDP. In the second method, all distributed power sources 1 are either charging or discharging, and charging and discharging do not occur simultaneously, thus enabling efficient use of the charged power.

[0053] Furthermore, the processing unit 21 is configured to calculate the degree of variation in the remaining charge of the batteries 12 owned by each distributed power source 1 based on the distributed power source information, and to execute the process in step S32 if the variation exceeds a predetermined value. If the variation is less than or equal to the predetermined value, step S32 is not executed, or the second setting value is set to zero "0". The method for calculating the variation is not particularly limited, but the processing unit 21 may determine the presence or absence of variation based on the standard deviation of the remaining charge, the variance of the remaining charge, the difference between the maximum and minimum values ​​of the remaining charge, or a combination thereof. Furthermore, the predetermined value of variation, which is the criterion for deciding whether to perform the process in step S32, may be divided into two stages. That is, in addition to a predetermined value for starting the calculation for leveling, a predetermined value for stopping the calculation for leveling can be defined, and by setting the latter to a smaller value than the former, so-called hysteresis can be introduced, and the leveling operation can be avoided by frequently starting and stopping it.

[0054] Then, the processing unit 21 adds the first setting value and the second setting value (step S33). The setting value obtained by adding in step S33 is called the added setting value. The added setting value CDPi is expressed by the following formula (3). CDPi = CDPi_1 + CDPi_2 ... (3)

[0055] The processing unit 21 determines whether the sum setting value calculated for each of the multiple distributed power sources 1 is equal to or greater than a predetermined threshold (step S34). Then, the processing unit 21 determines whether there is a sum setting value that is less than the predetermined threshold (step S35). If it is determined that there is no sum setting value that is less than the predetermined threshold (step S35: NO), the processing unit 21 creates a charge / discharge command based on the sum setting value calculated in step S33 (step S37).

[0056] If the processing unit 21 determines that there are any added setting values ​​below a predetermined threshold (step S35: YES), it redistributes the total charge and discharge power to the multiple distributed power supplies 1 whose added setting values ​​are equal to or greater than the predetermined threshold (step S36). For example, the processing unit 21 may execute steps S31 to S33 for the distributed power supplies 1 whose added setting values ​​are determined to be equal to or greater than the predetermined threshold. The processing unit 21 repeats steps S31 to S33 until all added setting values ​​reach the predetermined threshold. The processing unit 21 then uses these recalculated added setting values ​​as the final added setting values.

[0057] Next, the processing unit 21 creates a charge / discharge command based on the added setting value calculated in the above process (step S37), and then finishes the process. Note that for distributed power sources 1 whose added setting value is determined to be less than a predetermined threshold in step S34, the system may be configured to create a charge / discharge command with the charge / discharge setting value set to zero "0". Furthermore, if the variation in the remaining charge is less than or equal to a predetermined value, step S33 may be omitted, and the charge / discharge command may be created based on the first setting value. Additionally, if the variation in the remaining charge is less than or equal to a predetermined value, each distributed power source 1 may be operated individually using the automatic control mode of the distributed power source 1.

[0058] Although the process from steps S31 to S36 describes an example of creating a charge / discharge command indicating an added set value, the system may be configured to create a charge / discharge command indicating a first set value and a charge / discharge command indicating a second set value separately. In this case, the energy storage control device 2 transmits a charge / discharge command indicating a second set value for leveling the remaining energy storage amount, in addition to the charge / discharge command indicating the first set value.

[0059] <Effects and Effects> Figure 6 is a conceptual diagram showing the relationship between maximum charge / discharge power and the set value of charge / discharge power. In the example shown in Figure 6, the maximum charge / discharge power of the three distributed power sources 1 is highest for the leftmost power source, moderate for the center power source, and lowest for the rightmost power source. Figure 6 shows a state where the larger the maximum charge / discharge power, the larger the energy storage capacity, but the relationship between energy storage capacity and maximum charge / discharge power is not particularly limited. The first set value described above is obtained by proportionally distributing the total charge / discharge voltage according to the magnitude of the maximum charge / discharge power of the distributed power sources 1. Therefore, as shown in Figure 6, the set value of the charge / discharge command for a distributed power source 1 with a large maximum charge / discharge power is relatively large, and the set value of the charge / discharge command for a distributed power source 1 with a small maximum charge / discharge power is relatively small. For this reason, the charge / discharge power performed by a distributed power source 1 with a large maximum charge / discharge power is relatively large, and the charge / discharge power performed by a distributed power source 1 with a large maximum charge / discharge power is relatively small. Consequently, the energy storage control device 2 can fully utilize the maximum charge / discharge output of each distributed power source 1 to charge and discharge each distributed power source 1. For example, a distributed power source 1 with a small maximum charge / discharge power will not be given an excessively large charge / discharge command, and will be able to effectively charge and discharge the target total charge / discharge power.

[0060] Figure 7 is a conceptual diagram showing a method for leveling the remaining energy storage capacity, and Figure 8 is a conceptual diagram showing the state after the remaining energy storage capacity has been leveled. In the example shown in Figure 7, the remaining energy storage capacity of the three distributed power sources 1 is highest for the leftmost power source, moderate for the center power source, and lowest for the rightmost power source, resulting in variation in the remaining energy storage capacity. When variation in the remaining energy storage capacity occurs, the processing unit 21 sends a charge / discharge command to the distributed power source 1 with the relatively largest remaining energy storage capacity to instruct it to discharge, and sends a charge / discharge command to the distributed power source 1 with the relatively small remaining energy storage capacity to instruct it to charge, in order to level the remaining energy storage capacity. By controlling charging and discharging in this way, the remaining energy storage capacity of each distributed power source 1 can be equalized, as shown in Figure 8.

[0061] As described above, the energy storage control device 2, distributed energy storage control system, energy storage control method, and computer program P according to this embodiment 1 can equalize the remaining energy storage capacity of multiple distributed power sources 1 and fully utilize the energy storage capacity and charge / discharge output of each distributed power source 1. In other words, this disclosure makes it possible to reduce the frequency of situations where only some of the storage capacity of multiple storage batteries 12 is depleted or only some are fully charged, and to maintain the maximum charge and discharge power from all storage batteries 12. Furthermore, it is possible to continuously charge and discharge output utilizing all storage batteries 12 at all times, and it is possible to maintain grid power at or near target values ​​with precision for purposes such as self-consumption, reverse power flow prevention, peak shifting, and power plant output limiting and leveling, thereby reducing unintended reverse power flow and forward power flow. Furthermore, if each distributed power source 1 has a separate load A connected to it that will receive power during a power outage, leveling can be performed to distribute the remaining stored energy that can be supplied during a power outage in a roughly equal manner. This is useful when load A is located in individual dwelling units in an apartment building, for example.

[0062] When charging and discharging distributed power sources 1 for purposes such as self-consumption, reverse current prevention, peak shifting, and output limiting / leveling of power plants, the charging and discharging of each distributed power source 1 can be controlled so that variations in the remaining energy storage capacity of each distributed power source 1 do not occur.

[0063] Furthermore, if there are variations in the remaining charge of each distributed power source 1, the remaining charge of each distributed power source 1 can be equalized. For example, if each dwelling unit in an apartment building is equipped with a distributed power source 1, the remaining charge of each distributed power source 1 may vary depending on the presence or absence of residents in each dwelling unit and their lifestyles. When there are variations in the remaining charge, the storage capacity of the battery 12 in the entire apartment building and the power that can be charged and discharged may not be fully utilized, and self-consumption, reverse current prevention, peak shifting, etc., may not be effectively achieved. However, according to this embodiment 1, the remaining charge of each of the multiple distributed power sources 1 can be appropriately equalized, the storage capacity of each battery 12 can be effectively utilized, and objectives such as self-consumption, reverse current prevention, and peak shifting can be achieved.

[0064] Furthermore, if the charge / discharge setting value instructed by the charge / discharge command is below a predetermined threshold, the power conversion efficiency associated with charging and discharging will be poor, so the system is configured not to issue such charge / discharge commands. Therefore, the remaining energy storage capacity of each distributed power source 1 can be leveled out while taking power conversion efficiency into consideration.

[0065] Furthermore, the processing unit 21 of the energy storage control device 2 is configured to directly detect grid power from the power sensor 24 via the AD conversion circuit 21a, so that it can immediately respond to changes in the grid power status and control the charging and discharging of the distributed power supply 1.

[0066] In this embodiment 1, an example was described in which a charge / discharge command is performed using the sum of a first setting value and a second setting value. However, the system may also be configured to equalize the remaining energy storage capacity of each distributed power source 1 by transmitting a charge / discharge command based on the second setting value to each distributed power source 1 without using the first setting value.

[0067] Furthermore, as described above, an example of leveling the remaining charge capacity has been explained, but the energy storage control device 2 may also be configured to control the charging and discharging of the batteries 12 of each distributed power source 1 so as to level the dischargeable amount shown in Figure 3. In this case, the remaining charge capacity in the above embodiment can be read and understood as the dischargeable amount. Similarly, the method of representing the dischargeable amount included in the distributed power source information is not limited, and the distributed power source information can be configured to include the ratio of the dischargeable amount to the chargeable / dischargeable capacity. In other words, any information that substantially indicates the dischargeable amount is sufficient.

[0068] Furthermore, if for any reason one or more of the multiple distributed power sources 1 are removed from the control of the energy storage control device 2, the charging and discharging power from the removed distributed power source 1 can be considered as load power.

[0069] The means for resolving the issues discussed in this disclosure are described below. (Note 1) A communication unit capable of receiving information relating to a distributed power source, including the remaining charge of a battery, transmitted from a plurality of rechargeable distributed power sources having batteries that can be connected to a grid power source, and information relating to load power, which is the sum of generated power, charge / discharge power, and power consumption of load elements, power generation elements, energy storage elements, etc., connected to a grid power source, other than the plurality of distributed power sources, within a facility where the plurality of distributed power sources are installed. A processing unit that performs processing for controlling the aforementioned multiple distributed power sources and Equipped with, The aforementioned processing unit, Based on the acquired load power information and the target value of grid power to be maintained according to the purpose, a target value for total charge / discharge power, which is the sum of the individual charge power or discharge power of the multiple distributed power sources, is determined. Based on the information relating to the distributed power supply, including the remaining battery level, received by the communication unit, and the determined target value of the total charge / discharge power, a charge / discharge command is created to command the charging and discharging process. The generated charge / discharge command is transmitted to each distributed power source via the communication unit. Energy storage control device. (Note 2) A communication unit that receives information relating to a distributed power source, including the remaining charge of a battery, transmitted from a plurality of rechargeable distributed power sources having batteries that can be connected to a grid power source, A processing unit that performs processing for controlling the aforementioned multiple distributed power sources and Equipped with, The aforementioned processing unit, The facility where the multiple distributed power sources are installed and the grid power between them are obtained, as well as information on total charge / discharge power, which is the sum of the individual charge power or discharge power of the multiple distributed power sources. Based on the acquired information regarding grid power, the target value of grid power to be maintained according to the purpose, and the information regarding total charge and discharge power, the target value of total charge and discharge power is determined. Based on the information relating to the distributed power supply, including the remaining battery level, received by the communication unit, and the determined target value of the total charge / discharge power, a charge / discharge command is created to command the charging and discharging process. The generated charge / discharge command is transmitted to each distributed power source via the communication unit. Energy storage control device. (Note 3) The aforementioned processing unit, The facility where the multiple distributed power sources are installed and the grid power between them are obtained, as well as information on total charge / discharge power, which is the sum of the individual charge power or discharge power of the multiple distributed power sources. Based on the information relating to the grid power and the information relating to the total charge / discharge power, the load power is calculated. The energy storage control device described in Appendix 1 or Appendix 2. (Note 4) The aforementioned processing unit, By allocating the target value of the total charge / discharge power within the range of the maximum charge / discharge power that each distributed power source can charge / discharge, the set value of the charge / discharge power to be commanded to each distributed power source is calculated. Create a charge / discharge command based on the calculated set value. A power storage control device as described in any one of the appendices 1 through 3. (Note 5) The aforementioned processing unit, By allocating the target value of the total charge / discharge power within the range of the maximum charge / discharge power that each distributed power source can charge / discharge, a first set value of charge / discharge power to be commanded to each distributed power source is calculated. A second set value for the charge / discharge power to be commanded to each distributed power source is calculated so that the variation in the remaining battery capacity of the storage batteries of each distributed power source is equalized. Create a charge / discharge command based on the first and second set values. A power storage control device as described in any one of the appendices 1 through 4. (Note 6) The aforementioned processing unit, Determine whether the set value of the charge / discharge power commanded to each distributed power source is equal to or greater than a predetermined threshold. A charge / discharge command is created based on the set value which has been determined to be above the threshold. A power storage control device as described in any one of the appendices 1 through 5. (Note 7) The aforementioned processing unit, The set value of the charge / discharge power to be commanded to each distributed power source is calculated by allocating the target value of the total charge / discharge power to each distributed power source that is determined to be above the threshold value. A power storage control device as described in any one of the appendices 1 through 6. (Note 8) The aforementioned processing unit, The facility includes an AD conversion circuit that converts analog signals output from a power sensor, which outputs an analog signal corresponding to the magnitude and direction of grid power flowing between the facility and the grid power sources, into a digital signal, and acquires information related to grid power using the AD conversion circuit. A power storage control device as described in any one of the appendices 1 through 7. (Note 9) Multiple rechargeable distributed power sources having batteries that can be connected to the grid power supply, The energy storage control device controls charging and discharging by the multiple distributed power sources. A distributed energy storage control system equipped with, The aforementioned multiple distributed power sources are, The system includes a power communication unit that transmits information regarding the remaining battery charge of the storage battery to the power storage control device, The aforementioned energy storage control device is A communication unit that receives information transmitted from the aforementioned multiple distributed power sources, A processing unit that performs processing for controlling the aforementioned multiple distributed power sources and Equipped with, The aforementioned processing unit, The facility where the multiple distributed power sources are installed and the grid power information between the grid power sources are acquired. Based on the acquired grid power information and the target grid power values ​​to be maintained according to the purpose, the target value of the total charge / discharge power to be charged or discharged as a whole for multiple distributed power sources is determined. Based on the information relating to the distributed power supply, including the remaining battery level, received by the communication unit, and the determined target value of the total charge / discharge power, a charge / discharge command is created to command the charging and discharging process. The generated charge / discharge command is transmitted to each distributed power source via the communication unit. Distributed energy storage control system. (Note 10) Receiving information relating to the distributed power sources, including the remaining charge of the batteries, transmitted from multiple rechargeable distributed power sources having batteries that can be connected to the grid power source, The facility where the multiple distributed power sources are installed and the grid power information between the grid power sources are acquired. Based on the acquired grid power and information regarding the target values ​​of grid power to be maintained according to the purpose, the target value of the total charge / discharge power to be charged or discharged as a whole for multiple distributed power sources is determined. Based on the received information relating to the distributed power source, including the remaining battery level, and the determined target value of the total charge / discharge power, a charge / discharge command is created to command the charging and discharging process. The generated charge / discharge commands are sent to each distributed power source. Energy storage control method. (Note 11) Receiving information relating to the distributed power sources, including the remaining charge of the batteries, transmitted from multiple rechargeable distributed power sources having batteries that can be connected to the grid power source, The facility where the multiple distributed power sources are installed and the grid power information between the grid power sources are acquired. Based on the acquired information regarding charge and discharge power and the target value of grid power to be maintained according to the purpose, the target value of the total charge and discharge power to be charged or discharged as a whole for multiple distributed power sources is determined. Based on the received information relating to the distributed power source, including the remaining battery level, and the determined target value of the total charge / discharge power, a charge / discharge command is created to command the charging and discharging process. The generated charge / discharge commands are sent to each distributed power source. A computer program that causes a computer to perform a process. [Explanation of symbols]

[0070] 1: Distributed power supply 2: Energy storage control device 3: Grid power supply 4: Recording media 10: Control circuit 11: Solar power panels 11a: PV converter 12: Storage battery 12a: Battery converter 13: Power and Communication Unit 14: Inverter Circuit 15: Relay 16: Relay 17: Relay 18: Battery level detection IC 19: Power Sensor 21: Processing Unit 22: Storage section 23: Communications Department 24: Power Sensor P: Computer program

Claims

1. A communication unit capable of receiving information relating to a distributed power source, including the remaining charge of a battery, transmitted from a plurality of rechargeable distributed power sources having batteries that can be connected to a grid power source, and information relating to load power, which is the sum of generated power, charge / discharge power, and power consumption of load elements, power generation elements, and energy storage elements connected to a grid power source, other than the plurality of distributed power sources, within a facility where the plurality of distributed power sources are installed. A processing unit that performs processing for controlling the aforementioned multiple distributed power sources and Equipped with, The aforementioned processing unit, Based on the acquired load power information and the target value of grid power to be maintained according to the purpose, a target value for total charge / discharge power, which is the sum of the individual charge power or discharge power of the multiple distributed power sources, is determined. The determined target value of total charge / discharge power is allocated to each distributed power source according to its maximum charge / discharge power, within the range of the maximum charge / discharge power that each distributed power source can charge / discharge, thereby calculating a first set value of charge / discharge power to command each distributed power source. Based on the information relating to the distributed power sources, including the remaining battery level, received by the communication unit, a second set value for the charge / discharge power to be commanded to each distributed power source is calculated so that the variation in the remaining battery levels of the storage batteries of each distributed power source is equalized. Based on the first and second set values, a charge / discharge command is created to command charging and discharging. The generated charge / discharge command is transmitted to each distributed power source via the communication unit. Energy storage control device.

2. The aforementioned processing unit, The system determines whether the sum of the first and second set values ​​of the charge / discharge power commanded to each distributed power source is equal to or greater than a predetermined threshold. The first set value of charge / discharge power to be commanded to each distributed power source is calculated by allocating the target value of total charge / discharge power to each distributed power source that is determined to be equal to or greater than the threshold value of the summation setting value. The energy storage control device according to claim 1.

3. The aforementioned processing unit, The facility includes a power sensor that outputs an analog signal corresponding to the magnitude and direction of grid power flowing between the multiple distributed power sources and a power source, and an AD conversion circuit that converts the analog signal output from the power sensor into a digital signal, and the AD conversion circuit acquires information related to grid power. The energy storage control device according to claim 1 or claim 2.

4. Multiple rechargeable distributed power sources having batteries that can be connected to the grid power supply, The energy storage control device controls charging and discharging by the multiple distributed power sources. A distributed energy storage control system equipped with, The aforementioned multiple distributed power sources are, The system includes a power communication unit that transmits information regarding the remaining battery charge of the storage battery to the power storage control device, The aforementioned energy storage control device is A communication unit that receives information relating to the distributed power sources, including the remaining battery charge of the storage battery, transmitted from the plurality of distributed power sources, A processing unit that performs processing for controlling the aforementioned multiple distributed power sources and Equipped with, The aforementioned processing unit, The facility where the multiple distributed power sources are installed and the grid power information between the grid power sources are acquired. Based on the acquired grid power information and the target grid power values ​​to be maintained according to the purpose, the target value of the total charge / discharge power to be charged or discharged as a whole for multiple distributed power sources is determined. The determined target value of total charge / discharge power is allocated to each distributed power source according to its maximum charge / discharge power, within the range of the maximum charge / discharge power that each distributed power source can charge / discharge, thereby calculating a first set value of charge / discharge power to command each distributed power source. Based on the information relating to the distributed power sources, including the remaining battery level, received by the communication unit, a second set value for the charge / discharge power to be commanded to each distributed power source is calculated so that the variation in the remaining battery levels of the storage batteries of each distributed power source is equalized. Based on the first and second set values, a charge / discharge command is created to command charging and discharging. The generated charge / discharge command is transmitted to each distributed power source via the communication unit. Distributed energy storage control system.

5. Receiving information relating to the distributed power sources, including the remaining charge of the batteries, transmitted from multiple rechargeable distributed power sources having batteries that can be connected to the grid power source, The facility where the multiple distributed power sources are installed and the grid power information between the grid power sources are acquired. Based on the acquired grid power and information regarding the target values ​​of grid power to be maintained according to the purpose, the target value of the total charge / discharge power to be charged or discharged as a whole for multiple distributed power sources is determined. The determined target value of total charge / discharge power is allocated to each distributed power source according to its maximum charge / discharge power, within the range of the maximum charge / discharge power that each distributed power source can charge / discharge, thereby calculating a first set value of charge / discharge power to command each distributed power source. Based on the received information relating to the distributed power sources, including the remaining battery level, a second set value for the charge / discharge power to be commanded to each distributed power source is calculated so that the variation in the remaining battery levels of the storage batteries possessed by each distributed power source is equalized. Based on the first and second set values, a charge / discharge command is created to command charging and discharging. The generated charge / discharge commands are sent to each distributed power source. Energy storage control method.

6. Receiving information relating to the distributed power sources, including the remaining charge of the batteries, transmitted from multiple rechargeable distributed power sources having batteries that can be connected to the grid power source, The facility where the multiple distributed power sources are installed and the grid power information between the grid power sources are acquired. Based on the acquired grid power information and the target grid power values ​​to be maintained according to the purpose, the target value of the total charge / discharge power to be charged or discharged as a whole for multiple distributed power sources is determined. The determined target value of total charge / discharge power is allocated to each distributed power source according to its maximum charge / discharge power, within the range of the maximum charge / discharge power that each distributed power source can charge / discharge, thereby calculating a first set value of charge / discharge power to command each distributed power source. Based on the received information relating to the distributed power sources, including the remaining battery level, a second set value for the charge / discharge power to be commanded to each distributed power source is calculated so that the variation in the remaining battery levels of the storage batteries possessed by each distributed power source is equalized. Based on the first and second set values, a charge / discharge command is created to command charging and discharging. The generated charge / discharge commands are sent to each distributed power source. A computer program that causes a computer to perform a process.

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