Power storage control device, distributed power storage control system, power storage control method, and 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]

[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 technology]

[0002] In recent years, the use 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] Japanese Patent Publication No. 2022-110903 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a system in which multiple distributed power sources each having a storage battery are connected, there is a technical problem in that the storage capacity and chargeable / dischargeable power of each distributed power source are not 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 power storage capacity and chargeable / dischargeable power of each distributed power source. [Means for solving the problem]

[0006] A storage control device according to one aspect of the present disclosure includes a communication unit that can receive information related to a distributed power source, including the remaining battery capacity of the storage batteries, transmitted from a plurality of rechargeable distributed power sources having storage batteries connectable to a grid power source, and information related to load power, which is the sum of the generated power, charged / discharged power, consumed power, etc. of load elements, power generation elements, storage elements, etc. connected to the grid power source other than the plurality of distributed power sources within a facility where the plurality of distributed power sources are installed, and a processing unit that executes processing to control the plurality of distributed power sources, wherein 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 related to the load power and a target value for grid power that is maintained according to the purpose, creates a charge / discharge command to command charging / discharging based on the information related to the distributed power sources, including the remaining battery capacity received by the communication unit, and the determined target value for total charge / discharge power, and causes the communication unit to transmit the created charge / discharge command to each distributed power source.

[0007] A storage control device according to one aspect of the present disclosure includes a communication unit that receives information related to a distributed power source, including the remaining battery capacity of the storage batteries, transmitted from a plurality of rechargeable distributed power sources having storage batteries that can be connected to a grid power source, and a processing unit that executes processing to control the plurality of distributed power sources. The processing unit acquires information related to the grid power between the facility in which the plurality of distributed power sources are installed and the grid power source, and information related to the total charging and discharging power, which is the sum of the individual charging and discharging power of the plurality of distributed power sources. The processing unit determines a target value for the total charging and discharging power based on the acquired information related to the grid power, a target value for the grid power that is maintained according to the purpose, and the information related to the total charging and discharging power. The processing unit creates a charging and discharging command to command charging and discharging based on the information related to the distributed power sources, including the remaining battery capacity, received by the communication unit, and the determined target value for the total charging and discharging power. The processing unit then transmits the created charging and discharging command to each distributed power source via the communication unit. [Effects of the Invention]

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

[0009] [Figure 1] 1 is a schematic diagram illustrating a configuration example of a distributed power storage control system according to a first embodiment. [Figure 2] FIG. 1 is a block diagram showing an example of the configuration of a distributed power source. [Figure 3] 3 is an explanatory diagram showing the charge state and capacity of the storage battery according to the first embodiment. FIG. [Figure 4] 4 is a flowchart showing a processing procedure for charge / discharge control according to the first embodiment. [Figure 5] 4 is a flowchart showing a processing procedure for creating a charge / discharge command according to the first embodiment. [Figure 6] FIG. 4 is a conceptual diagram showing the relationship between the maximum charge / discharge power and the set value of the charge / discharge power. [Figure 7] FIG. 10 is a conceptual diagram showing a method for leveling the remaining amount of stored electricity. [Figure 8] FIG. 10 is a conceptual diagram showing a state in which the remaining amount of stored electricity is leveled. DETAILED DESCRIPTION OF THE INVENTION

[0010] A storage control device, a distributed storage control system, a storage control method, and a computer program according to embodiments of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. Furthermore, at least some of the embodiments described below may be combined in any manner.

[0011] <Distributed power supply system> FIG. 1 is a schematic diagram illustrating an example of the configuration of a distributed energy storage control system according to a first embodiment, and FIG. 2 is a block diagram illustrating an example of the configuration of a distributed power source 1. The distributed energy storage control system according to the first embodiment includes a plurality of distributed energy sources 1 installed in a facility T such as an apartment building, a building, or a factory, and a power storage control device 2 that controls charging and discharging by each of the distributed energy sources 1. The power storage control device 2 attempts to level out the remaining battery power of the plurality of distributed energy sources 1 and fully utilizes the storage capacity and chargeable / dischargeable power of each distributed energy source 1, thereby optimizing the power supply and demand in the facility T and enabling, for example, maximum utilization of renewable energy. The remaining battery power can be the remaining stored power amount, the dischargeable power amount, etc. (see FIG. 3 ), but in this embodiment, the leveling of the remaining stored power amount will be mainly described as an example. The facility T is a facility connected to the power grid 3 and in which a plurality of distributed power sources 1 each having a storage battery 12 connectable to the power grid 3 are installed. In addition, the point on the electric path at which facility T receives power from the grid power supply 3 is the power receiving point. In Fig. 1, the location where the power sensor 24 is installed is the power receiving point. Facility T can receive power from the grid power supply 3 through this point (forward power flow), and facility T can also supply power to the grid power supply 3 through this point (reverse power flow). Furthermore, in this disclosure, absorbing power from the distributed power source 1 on-site electric circuits is referred to as charging, and discharging power from the distributed power source 1 to the on-site electric circuits is referred to as discharging. Also, power resulting from charging is referred to as charging power, power resulting from discharging is referred to as discharging power, and the combination of both is referred to as charging and discharging power. If the distributed power source 1 only has a storage battery 12, these terms may be interpreted as charging and discharging the storage battery 12. In the case of a hybrid energy storage system in which the distributed power source 1 has both a storage battery 12 and a generator, the combined output of the power generated by the generator and the charging / discharging power from the storage battery 12 becomes the charging / discharging power of the distributed power source 1. Furthermore, the signs of the quantities are as follows: Grid power: Forward flow is positive and reverse flow is negative. Charge and discharge power of each distributed power source 1 (total charge and discharge power): Charging is positive and discharging is negative. Load power: positive.

[0012] The distributed power source 1 is, for example, a hybrid power storage system with a communication function, and as shown in Fig. 1, includes a solar power generation panel 11, a storage battery 12, and a power supply communication unit 13. In detail, 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 supply communication unit 13, an inverter circuit 14, relays 15, 16, and 17, a remaining power storage detection IC 18, and a power sensor 19. The system power source 3 includes not only a commercial system power source provided by an electric power company, but also a power supply source provided in a microgrid system and other power supply sources.

[0013] The photovoltaic panel 11 includes a plurality of solar cells that convert sunlight energy into electrical power and output the power. 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 photovoltaic 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. The type of storage battery 12 is not limited, and other secondary batteries such as a nickel-metal hydride battery or a NAS battery may be used. The storage battery converter 12a is a circuit that charges and discharges the storage battery 12. When charging the storage battery 12, the storage battery converter 12a charges the storage battery 12 by adjusting the current or voltage of DC power converted from AC power supplied from the system power supply 3 by the inverter circuit 14. The PV converter 11a charges the storage battery 12 by adjusting the current or voltage of DC power supplied from the solar power generation panel 11. When discharging the storage battery 12, the storage battery converter 12a adjusts the current and voltage of the DC discharged from the storage battery 12 to suit the inverter circuit 14 and outputs the adjusted current and voltage.

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

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

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

[0018] The inverter circuit 14 converts AC power input from the on-site electric power line into DC power and outputs it to the storage battery converter 12a. The storage 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 electric circuit and the distributed power source 1, relay 16 is a circuit that opens and closes the circuit between the on-site electric circuit and load A, and relay 17 is a circuit that opens and closes the circuit between the distributed power source 1 and load A. When interconnected to the grid, relays 15 and 16 are closed and relay 17 is opened, thereby connecting the distributed power source 1 and load A to the on-site electric circuit. When a power outage occurs, relays 15 and 16 are opened and relay 17 is closed, thereby disconnecting the distributed power source 1 and load A from the on-site electric circuit, and power from the distributed power source 1 is supplied to load A in stand-alone operation mode. Note that although load A is shown connected to the distributed power source 1 in both Figures 1 and 2, when interconnected to the grid, load A is connected to the on-site electric circuit by opening and closing the relays described above.

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

[0021] Although an example in which the remaining charge detection IC 18 is provided has been described, the control circuit 10 may be configured to detect the voltage or current and temperature of the storage battery 12 using the battery state detection sensor 17a and calculate the remaining charge of the storage battery 12. The remaining charge may also be calculated 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 the distributed generation 1 to which the power sensor 19 is attached and the load A and the on-site electrical circuit. The control circuit 10 receives the analog signal output from the power sensor 19 and detects the power being supplied and demanded between the distributed generation 1 and the system power supply 3. The power sensor 19 may be configured to detect the magnitude and direction of power by detecting the magnitude and direction of current while maintaining a constant voltage.

[0023] The power source communication unit 13 is a communication circuit for transmitting various information to and from the energy storage control device 2. Specifically, the power source communication unit 13 transmits an identifier of the distributed power source 1 and information related to the distributed power source 1 (hereinafter referred to as distributed power source information) to the energy storage control device 2 under the control of the control circuit 10. The distributed power source information includes, for example, an identifier of the distributed power source 1, the remaining amount of stored power in the storage battery 12, and the maximum charge / discharge power that the distributed power source 1 can charge / discharge (hereinafter referred to as maximum charge / discharge power). The maximum charge / discharge power may be calculated based on information obtained from the distributed power source information or the rated charge / discharge power of the distributed power source 1. The method for expressing the remaining amount of stored power is not particularly limited, and may be a value that allows the remaining amount of stored power to be calculated by calculation, such as the ratio of the dischargeable amount to the dischargeable capacity. In other words, any value that substantially indicates the remaining amount of stored power may be used. Furthermore, the power supply communication unit 13 receives a charge / discharge command transmitted from the power storage control device 2. The control circuit 10 controls the operation of the storage battery converter 12a in accordance with the charge / discharge command received by the power supply communication unit 13, and charges or discharges the storage 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 storage control device 2, such as the identifier of the distributed power source 1, the remaining amount of stored power in the storage 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 including an arithmetic circuit such as a CPU (Central Processing Unit), a multi-core CPU, and an FPGA (Field-Programmable Gate Array), a volatile memory, a non-volatile memory, and a timer. The non-volatile memory stores an identifier for identifying the distributed power source 1, the effective capacity of the storage battery 12, the set power for a power outage, the chargeable / dischargeable capacity, the dischargeable capacity, the dischargeable amount, and the chargeable amount. The control circuit 10 controls the operation of the PV converter 11a, the storage battery converter 12a, the inverter circuit 14, and the power communication unit 13, and also controls the opening and closing of relays 15, 16, and 17 to control charging and discharging by the distributed power source 1. The control circuit 10 controls the operation of the PV converter 11a and the inverter circuit 14 to supply power generated by the photovoltaic power generation panel 11 to the on-site electric power line. The control circuit 10 also controls the operation of the storage battery converter 12a to charge the storage battery 12. Furthermore, the control circuit 10 controls the operation of the storage battery converter 12a and the inverter circuit 14 to discharge the storage battery 12 and supply the discharged power to the on-site electric power line. The control circuit 10 controls the charging and discharging of the storage battery 12 according to purposes such as self-consumption, reverse power prevention, peak shifting, and power plant output limiting and leveling. Furthermore, the control circuit 10 can recognize the state of the storage battery 12, such as the remaining amount of stored power, by acquiring information output from the remaining power detection IC 18. The control circuit 10 can transmit and receive various information to and from the storage control device 2 by controlling communication via the power supply communication unit 13. In addition, the control circuit 10 may receive charge / discharge commands to the distributed power source 1 via the power supply communication unit 13, and control the operation of the storage battery converter 12a to charge or discharge the storage battery 12, or may control the operation of the inverter circuit 14 to charge or discharge the storage battery 12 via the storage battery converter 12a.

[0025] In the above explanation, a hybrid power storage system has been mainly described as an example of the distributed power source 1, but it is sufficient if the distributed power source 1 is configured to include any generator and storage battery 12 that is smaller in scale than the grid power source 3. 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 uses fossil fuels, a power generation system that uses hydrogen energy, or a hybrid power storage system that includes any of these.

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

[0027] Furthermore, while FIG. 1 shows an example in which all power sources connected to the storage control device 2 are distributed power sources 1 having power generation and storage functions, a configuration in which power sources having only power generation or only storage functions are further connected may also be used. Furthermore, although an example has been described in which load A is connected to an on-site electrical circuit via a distributed power source 1, load A may also be configured to be directly connected to the on-site electrical circuit, and load A does not necessarily have to correspond one-to-one with distributed power sources 1. Furthermore, a configuration may be possible in which a plurality of generators, storage batteries or loads that are not connected to the power storage control device 2 are connected to an on-site electric circuit.

[0028] The power storage control device 2 is a computer that implements the power storage control method according to the first embodiment, and includes a processing unit 21, a storage unit 22, and a communication unit 23, with each unit being connected via a bus.

[0029] The processing unit 21 is a processor having an arithmetic circuit such as a CPU (Central Processing Unit), a multi-core CPU, and an FPGA (Field-Programmable Gate Array), an internal storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory), a timer, an AD conversion circuit 21a, etc. The processing unit 21 implements the power storage control method according to the first embodiment by executing a computer program (program product) P stored in a storage unit 22 (described later). Note that each functional unit of the power storage control device 2 may be realized by software, or part or all of it may be realized by hardware.

[0030] A power sensor 24 that outputs an analog signal corresponding to the magnitude and direction of power flowing between a facility T where multiple distributed power sources 1 are installed and the grid power source 3 is connected to the AD conversion circuit 21a of the processing unit 21. The power sensor 24 may be configured with 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 and demanded 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 FIG. 1 . Furthermore, multiple other generators, power storage devices, or loads that are not connected to the power storage control device 2 may be connected to the on-site electric circuit within the facility T. The grid power refers to the power at the receiving point. The sign of the power is opposite during forward power flow and reverse power flow. The power storage control device 2 in FIG. 1 acquires the value of the grid power by 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 execute 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 a computer program P to be executed by the processing unit 21. The computer program P may be readably recorded on a recording medium 4 such as a magnetic disk, optical disk, or semiconductor memory, or may be read from the recording medium 4 by a reading device and stored in the storage unit 22.

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

[0033] The power storage control device 2 may be a computer in an on-premise environment, or may be a computer such as a server in a cloud environment. The power storage control device 2 may be configured to perform distributed processing using multiple computers, may be realized by multiple virtual machines installed in a single server, or may be realized using a cloud server. When the power storage control device 2 is in a cloud environment or has a distributed processing configuration, it may obtain information from the power sensor 24 using a communication means other than via an AD conversion circuit.

[0034] <Charge / discharge control> 4 is a flowchart showing the procedure for charge / discharge control according to embodiment 1. The power storage control device 2 transmits a transmission command to each of the plurality of distributed power sources 1 requesting transmission of distributed power source information (step S11), and each distributed power source 1 that has received the transmission command detects the state of the storage battery 12 (step S12). Specifically, the control circuit 10 of the distributed power source 1 detects the remaining amount of stored power in the storage battery 12 using the remaining amount of stored power detection IC 18.

[0035] Then, the multiple distributed power sources 1 transmit distributed power source information including the remaining storage capacity, maximum charge / discharge power, charge / discharge power, etc. of the storage batteries 12 obtained by monitoring them to the storage control device 2 via the power source communication unit 13 (step S13).

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

[0037] Next, the processing unit 21 adds up the acquired individual charge power or discharge power of each distributed power source 1 to calculate the current total charge / discharge power. The total charge / discharge power is the total power of charge / discharge power of the multiple distributed power sources 1 that are the control targets of the storage control device 2. Next, from the acquired information related to the grid power and the above-mentioned total charge / discharge power, it calculates the load power, which is the total of the generated power, charge / discharge power, and consumed power of the load elements, power generation elements, storage elements, etc., connected to the grid power source 3 within the facility T other than the multiple distributed power sources. Here, the load power can be expressed by the following formula. Load power = grid power - total charging / discharging power In the first embodiment, the load power is calculated from the distributed power supply information and the information related to the grid power, but it may be measured by other means and received by the power storage control device 2. In addition, although the total charge / discharge power is calculated from the distributed power source information, the charge / discharge power of each distributed power source may be measured individually, bundled together, or bundled together in several groups, or may be measured using other means and received by the storage control device 2. The total charge / discharge power may be calculated by adding up the charge / discharge command values ​​of the dispersed power sources in the previous cycle. Furthermore, based on the load power and the target value of the grid power maintained according to the purpose of charging and discharging, a total charge / discharge power target value to be charged or discharged across the plurality of distributed power sources 1 is determined (step S16). The total charge / discharge power target value is a target value for the total charge / discharge power, and is used to calculate the command value for each distributed power source 1.

[0038] These objectives include, for example, self-consumption, reverse power prevention, peak shifting, and limiting and leveling of power plant output. Self-consumption aims to maximize the use of power generated by the solar panel 11 for consumption by load A and minimize the purchase of power from the grid power source 3. Along with reverse power prevention (described below), it aims to keep forward power flow below a certain level. Reverse power prevention aims to prevent reverse power flow by charging the distributed power source 1 in situations where reverse power flow may occur. Peak shifting aims to limit forward power flow below a specified power level by charging the storage battery 12 during times of low power consumption and discharging the distributed power source 1 during times of high power consumption. Power plant output limiting and leveling aims to prevent the power plant from exceeding the output contracted with the power company or to stabilize output by maintaining output near a certain power level by charging when the generated power exceeds a specified power and discharging when it falls below the specified power.

[0039] For example, when the facility T is discharging power to the grid power supply 3 (reverse power flow) and the purpose is self-consumption and prevention of reverse power, the target value of the grid power may simply be set to 0 W, and the processing unit 21 may determine, as the total charge / discharge power value, a power value that cancels out the load power calculated from the current grid power (value of power discharged to the grid power supply 3) and the total charge / discharge power.More practically, the target value of the grid power may be set to a power value of a certain magnitude on the forward flow side, rather than 0 W, taking into consideration a margin for reducing the time and magnitude of the reverse power flow.

[0040] When power is being supplied from the system power source 3 to the facility T (forward flow) and the purpose is peak shifting, the target value of the system power is set to the peak upper limit power value, and the processing unit 21 determines the power value obtained by subtracting the current system power (power value being supplied) and the load power calculated from the total charging / discharging power from the target value as the total charging / discharging power target value.

[0041] Next, the processing unit 21 generates a charge / discharge command for instructing each distributed power source 1 to charge or discharge based on the distributed power source information received by the communication unit 23, the grid power target value, and the total charge / discharge power calculated 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 that is determined according to the purpose. The method for generating the charge / discharge command will be described in detail later.

[0042] The grid power target value is set, for example, as follows. In the case of a self-consumption type (preventing reverse power flow + minimizing forward power flow), the grid power target value is expressed as follows: Grid power target value = forward flow buffer value (positive) Even when controlling the distributed power source 1, fluctuations in photovoltaic power generation and load are always present, so there is always some degree of fluctuation in increase or decrease relative to the target value. Therefore, particularly when reverse power flow is "prohibited," the grid power target value is often set as a buffer value at which the grid power becomes a certain degree of forward power flow. In the case of power plant output capping and leveling, the grid power target value is expressed as follows: Grid power target value = target power generation (negative) In solar power plants and the like, if a high-voltage contract is signed, when the power generation exceeds a certain level, it becomes an extra-high-voltage contract, and in order to prevent the premise of the contract from changing, or to level out the power generation to a certain value, storage battery 12 may be used. By setting it up as described above, surplus power is charged to storage battery 12, and insufficient power is discharged from storage battery 12 to meet the target.

[0043] Then, the processing unit 21 transmits the charge / discharge commands for the plurality of distributed power sources 1 created in step S16 to each of the distributed power sources 1 (step S18). Each distributed power source 1 receives the charge / discharge command transmitted from the power storage control device 2 (step S19), and controls the charge / discharge of the storage battery 12 in accordance with the received charge / discharge command (step S20), thereby completing the process.

[0044] 4, the reception period for the distributed power source information and the acquisition period for the grid power are illustrated as being the same, but the periods may be different. Generally, grid power changes more significantly over a shorter time scale than distributed power source information, so it is advisable to make the detection period for the grid power in step S15 shorter than the reception period for the distributed power source information. This allows for quick control of the charging and discharging of the distributed power source 1 in response to the state of the grid power.

[0045] The processing of steps S11 to S20 described above is repeatedly executed at a predetermined cycle, and the remaining amounts of stored electricity in the distributed power sources 1 are leveled while controlling the grid power appropriately for the purpose.

[0046] 5 is a flowchart showing the processing procedure for creating a charge / discharge command according to embodiment 1. The processing unit 21 calculates a first set value of 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 in accordance with the maximum charge / discharge power that each distributed power source 1 can charge / discharge (step S31).

[0047] The first set value is expressed, for example, by the following formula (1): When the set value is a positive value, it indicates the value of charging power, and when the set value is a negative value, it indicates the value of discharging power. CDPi_1=TCDP×MaxCDPi / ΣMaxCDPi…(1) however, CDPi_1: The first setting value for the distributed power source 1 with identification number i i: Identification number (1 to n) of multiple distributed power sources 1 n is the total number of distributed power sources1 TCDP: Total charge / discharge power target value MaxCDPi: Maximum charge / discharge power of distributed power source 1 with identification number i

[0048] The maximum charge / discharge power used in calculating the first set value may be the value acquired from the distributed power sources 1 in steps S12 to S15, or the rated charge / discharge power of the distributed power sources 1. If the maximum charge power and maximum discharge power are different values ​​due to the specifications of the distributed power sources 1, they may be used during charging and discharging, respectively. Furthermore, other distribution methods may be used to allocate the total charge / discharge power, as long as they do not exceed the maximum charge / discharge power of each distributed power source 1.

[0049] Next, based on the distributed power source information, the processing unit 21 calculates a second set value of charge / discharge power to be instructed to each distributed power source 1 so as to level out the variation in the remaining amount of electricity stored in the storage batteries 12 of each distributed power source 1 (step S32).

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

[0051] In this case, the total value of CDPi_2 of all the dispersed power sources 1 is 0, and the total value of CDPi_1 is not affected.

[0052] Furthermore, although C has been described as a predetermined coefficient, it may be a value determined as follows. MaxACDP: The maximum absolute value of each distributed power source 1 (ARC-RCi) As, (1st method) The coefficient C should be set to the smallest value obtained by subtracting the first setting value of each distributed power source 1 from the maximum charging / discharging capacity of that distributed power source 1 [Min ((maximum charging / discharging capacity of each distributed power source 1 - first setting value))] divided by MaxACDP. In the first method, maximum output can be achieved while maintaining the ratio for leveling the remaining stored power. This method places emphasis on leveling speed. (Second method) It is recommended to set the coefficient C to the minimum of the first setting values ​​of each distributed generation 1 [Min (the first setting value of each distributed generation 1)] divided by MaxACDP. In the second method, all distributed generation 1 are either charging or discharging, and charging and discharging do not occur simultaneously, which allows for efficient use of charged power.

[0053] The processing unit 21 may be configured to calculate the degree of variation in the remaining amount of stored power of the storage batteries 12 of each distributed power source 1 based on the distributed power source information, and execute the process of step S32 if the variation exceeds a predetermined value. If the variation is equal to or less than the predetermined value, step S32 is not executed, or the second set value is set to zero (0). The method for calculating the variation is not particularly limited, and the processing unit 21 may determine the presence or absence of variation based on the standard deviation of the remaining amount of stored power, the variance of the remaining amount of stored power, the difference between the maximum and minimum values ​​of the remaining amount of stored power, or a combination of these. The predetermined value of variation, which is the criterion for performing the process of step S32, may be divided into two stages. That is, by setting a predetermined value for starting the calculation for leveling and a predetermined value for stopping the calculation for leveling, and setting the latter value smaller than the former, so-called hysteresis can be provided, thereby avoiding frequent starting and stopping of the leveling operation.

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

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

[0056] If it is determined that there is an additional set value less than the predetermined threshold (step S35: YES), the processing unit 21 redistributes all charging and discharging power to the plurality of dispersed power sources 1 whose additional set 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 dispersed power sources 1 whose additional set values ​​are determined to be equal to or greater than the predetermined threshold. The processing unit 21 repeats steps S31 to S33 until all of the additional set values ​​reach the predetermined threshold. Then, the processing unit 21 sets the recalculated additional set value as the final additional set value.

[0057] Next, the processing unit 21 generates a charge / discharge command based on the addition set value calculated in the above process (step S37), and ends the process. Note that for a distributed power source 1 for which it is determined in step S34 that the addition set value is less than the predetermined threshold, a charge / discharge command with a charge / discharge set value of zero (0) may be generated. Furthermore, if the variation in the remaining power storage capacity is equal to or less than a predetermined value, step S33 may not be executed, and a charge / discharge command may be generated based on the first set value. Furthermore, if the variation in the remaining power storage capacity is equal to or less than a predetermined value, each distributed power source 1 may be operated individually in the automatic control mode of the distributed power source 1.

[0058] Although an example has been described in which a charge / discharge command indicating an added set value is created by the processing of steps S31 to S36, a configuration may be adopted in which a charge / discharge command indicating a first set value and a charge / discharge command indicating a second set value are created separately. In this case, the power storage control device 2 transmits a charge / discharge command indicating a second set value for leveling the remaining amount of stored power, separately from the charge / discharge command indicating the first set value.

[0059] <Action and effect> FIG. 6 is a conceptual diagram showing the relationship between the maximum charge / discharge power and the set value of the charge / discharge power. In the example shown in FIG. 6, the maximum charge / discharge power of the three distributed power sources 1 is the highest for the power source on the left, the medium for the power source in the center, and the lowest for the power source on the right. While FIG. 6 shows a state in which the higher the maximum charge / discharge power, the larger the storage capacity, the relationship between the storage capacity and the maximum charge / discharge power is not particularly limited. The first set value described above is obtained by proportionally allocating 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 FIG. 6, the set value of the charge / discharge command value for the distributed power source 1 with a high maximum charge / discharge power is relatively high, and the set value of the charge / discharge command value for the distributed power source 1 with a low maximum charge / discharge power is relatively low. Therefore, the charge / discharge power performed by the distributed power source 1 with a high maximum charge / discharge power is relatively high, and the charge / discharge power performed by the distributed power source 1 with a high maximum charge / discharge power is relatively low. Therefore, the storage control device 2 can fully utilize the maximum charge / discharge output of each distributed power source 1 to charge / discharge each distributed power source 1. For example, a charge / discharge command with an excessively large set value is not given to a distributed generation 1 with a small maximum charge / discharge power, and charging / discharging of the target total charge / discharge power can be performed effectively.

[0060] Fig. 7 is a conceptual diagram showing a method for leveling the remaining amount of stored electricity, and Fig. 8 is a conceptual diagram showing the state in which the remaining amount of stored electricity has been leveled. In the example shown in Fig. 7, the remaining amount of stored electricity of the three distributed power sources 1 varies, with the power source on the left being the largest, the power source in the middle being medium, and the power source on the right being the smallest. When there is variation in the remaining amount of stored electricity, the processing unit 21 transmits a charge / discharge command to instruct the distributed power source 1 with a relatively large remaining amount of stored electricity to discharge, and transmits a charge / discharge command to instruct the distributed power source 1 with a relatively small remaining amount of stored electricity to charge, in order to level the remaining amount of stored electricity. By controlling charging and discharging in this way, the remaining amounts of stored electricity in the dispersed power sources 1 can be leveled as shown in FIG.

[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. That is, the present disclosure can reduce the frequency with which only a portion of the remaining stored power of the multiple storage batteries 12 is depleted or fully charged, and can maintain maximum charge / discharge power from all of the storage batteries 12. Furthermore, continuous charge / discharge output is always possible using all of the storage batteries 12, and grid power can be accurately maintained near a target value for purposes such as self-consumption, prevention of reverse power, peak shifting, and limiting and leveling of power output from power plants, thereby reducing unintended reverse power flow and forward power flow. Furthermore, when each distributed power source 1 is connected to a separate load A that will supply power during a power outage, leveling allows the remaining stored energy that can be supplied during a power outage to be allocated roughly equally. This is useful when the loads A are located in individual apartments in an apartment building.

[0062] When charging and discharging the distributed power sources 1 for purposes such as self-consumption, reverse power prevention, peak shifting, and limiting and leveling of power plant output, the charging and discharging of each distributed power source 1 can be controlled so that there is no variation in the remaining amount of electricity stored in the distributed power sources 1.

[0063] Furthermore, when there is a variation in the remaining stored power amounts of the distributed power sources 1, the remaining stored power amounts of the distributed power sources 1 can be leveled. For example, when a distributed power source 1 is installed in each dwelling unit of an apartment building, there may be a variation in the remaining stored power amounts of the distributed power sources 1 depending on the presence or absence of residents in each dwelling unit and their lifestyles. When there is a variation in the remaining stored power amounts, the storage capacity and chargeable / dischargeable power of the storage batteries 12 throughout the apartment building may not be fully utilized, and self-consumption, reverse power prevention, peak shifting, etc. may not be effectively realized. However, according to the first embodiment, the remaining stored power amounts of the multiple distributed power sources 1 can be appropriately leveled, and the storage capacity of each storage battery 12 can be effectively utilized to achieve the goals of self-consumption, reverse power prevention, peak shifting, etc.

[0064] Furthermore, if the set value of charge / discharge instructed by the charge / discharge command is less than a predetermined threshold, the power conversion efficiency associated with charge / discharge will be poor, so the system is configured not to issue such a charge / discharge command. Therefore, the remaining amount of stored power in each distributed power source 1 can be equalized while taking into consideration the power conversion efficiency.

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

[0066] In this embodiment 1, an example has been described in which a charge / discharge command is issued using a set value obtained by adding the first set value and the second set value, but the remaining amount of stored electricity in each distributed power source 1 may also be leveled by sending a charge / discharge command based on the second set value to each distributed power source 1 without using the first set value.

[0067] Furthermore, as described above, an example in which the remaining amount of stored electricity is leveled has been described, but the energy storage control device 2 may be configured to control the charging and discharging of the storage batteries 12 of each distributed power source 1 so as to level the dischargeable amount shown in FIG. 3. In this case, the remaining amount of stored electricity in the above embodiment can be understood as the dischargeable amount. Note that the method of expressing the dischargeable amount included in the distributed power source information is similarly not limited, and the distributed power source information can be configured to include the ratio of the dischargeable amount to the chargeable and dischargeable capacity. In other words, any information that essentially indicates the dischargeable amount will suffice.

[0068] Furthermore, if one or more of the multiple dispersed power sources 1 are removed from the control targets of the power storage control device 2 for some reason, the charging and discharging power of the removed dispersed power sources 1 can be regarded as load power.

[0069] The means for solving the problems of the present disclosure are described below. (Appendix 1) a communication unit that can receive information related to a distributed power source, including the remaining battery capacity of the storage batteries, transmitted from a plurality of chargeable and dischargeable distributed power sources having storage batteries connectable to a grid power source, and information related to load power, which is the sum of generated power, charged and discharged power, consumed power, etc. of load elements, power generating elements, power 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 executes processing for controlling the plurality of distributed power sources; Equipped with The processing unit determining a target value for total charging / discharging power, which is the sum of the individual charging power or discharging power of the plurality of distributed power sources, based on the acquired information on load power and a target value for grid power that is maintained according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the information related to the distributed power sources, including the remaining battery power, received by the communication unit and the determined target value of the total charge / discharge power; The communication unit transmits the created charge / discharge command to each distributed power source. Energy storage control device. (Appendix 2) a communication unit that receives information related to a plurality of chargeable and dischargeable distributed power sources, each having a storage battery connectable to a power grid, the information including the remaining battery capacity of the storage battery; a processing unit that executes processing for controlling the plurality of distributed power sources; Equipped with The processing unit acquiring information on the grid power between the facility where the plurality of distributed power sources are installed and the grid power source, and information on total charging and discharging power, which is the sum of the individual charging power or discharging power of the plurality of distributed power sources; determining a target value of total charge / discharge power based on the acquired information on the grid power, the target value of the grid power held according to the purpose, and the information on the total charge / discharge power; creating a charge / discharge command for issuing a charge / discharge command based on the information related to the distributed power sources, including the remaining battery power, received by the communication unit and the determined target value of the total charge / discharge power; The communication unit transmits the created charge / discharge command to each distributed power source. Energy storage control device. (Appendix 3) The processing unit acquiring information on the grid power between the facility where the plurality of distributed power sources are installed and the grid power source, and information on total charging and discharging power, which is the sum of the individual charging power or discharging power of the plurality of distributed power sources; The load power is calculated based on the information related to the grid power and the information related to the total charge / discharge power. 10. The power storage control device according to claim 1 or 2. (Appendix 4) The processing unit calculating a set value of charge / discharge power to be instructed to each distributed power source by allocating the target value of the total charge / discharge power within a range of the maximum charge / discharge power that each distributed power source can charge / discharge; A charge / discharge command is generated based on the calculated set value. 4. The power storage control device according to claim 1, wherein the power storage control device is a power storage control device. (Appendix 5) The processing unit calculating a first set value of charge / discharge power to be instructed to each distributed power source by allocating the target value of the total charge / discharge power within a range of the maximum charge / discharge power that each distributed power source can charge / discharge; calculating a second set value of charge / discharge power to be instructed to each distributed power source so as to equalize the variation in remaining battery power levels of the storage batteries of each distributed power source; generating a charge / discharge command based on the first set value and the second set value; 5. The power storage control device according to claim 1, wherein the power storage control device is a power storage control device. (Appendix 6) The processing unit determining 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 generated based on the set value determined to be equal to or greater than the threshold value. 6. The power storage control device according to claim 1, wherein the power storage control device is a power storage control device. (Appendix 7) The processing unit The target value of the total charge / discharge power is allocated to each distributed power source that is a target of a charge / discharge command based on the set value determined to be equal to or greater than the threshold value, thereby calculating the set value of charge / discharge power to be instructed to each distributed power source. 7. The power storage control device according to claim 1, wherein the power storage control device is a power storage control device. (Appendix 8) The processing unit An AD conversion circuit is provided which converts analog signals output from a power sensor that outputs analog signals corresponding to the magnitude and direction of grid power flowing between the facility where the plurality of distributed power sources are installed and the grid power source into digital signals, and acquires information related to the grid power by the AD conversion circuit. 8. The power storage control device according to claim 1, wherein the power storage control device is a power storage control device. (Appendix 9) a plurality of chargeable and dischargeable distributed power sources each having a storage battery connectable to a grid power source; a power storage control device that controls charging and discharging of the plurality of distributed power sources; A distributed power storage control system comprising: The plurality of distributed power sources include: a power supply communication unit that transmits information related to a remaining battery charge of the storage battery to the power storage control device; The power storage control device includes: a communication unit that receives information transmitted from the plurality of distributed power sources; a processing unit that executes processing for controlling the plurality of distributed power sources; Equipped with The processing unit acquiring information related to the facility where the plurality of distributed power sources are installed and the grid power between the grid power sources; determining a target value of total charging / discharging power to be charged or discharged across the plurality of distributed power sources as a whole based on the acquired information on the grid power and the target value of the grid power held according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the information related to the distributed power sources, including the remaining battery power, received by the communication unit and the determined target value of the total charge / discharge power; The communication unit transmits the created charge / discharge command to each distributed power source. Distributed energy storage control system. (Appendix 10) receiving information related to a plurality of chargeable and dischargeable distributed power sources, each having a storage battery connectable to a grid power source, including remaining battery capacity of the storage battery; acquiring information related to the facility where the plurality of distributed power sources are installed and the grid power between the grid power sources; determining a target value of total charging / discharging power to be charged or discharged across the plurality of distributed power sources as a whole based on the acquired grid power and information relating to the target value of grid power that is maintained according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the received information related to the distributed power source, including the remaining battery capacity, and the determined target value of the total charge / discharge power; Send the created charge / discharge command to each distributed power source Energy storage control method. (Appendix 11) receiving information related to a plurality of chargeable and dischargeable distributed power sources, each having a storage battery connectable to a grid power source, including remaining battery capacity of the storage battery; acquiring information related to the facility where the plurality of distributed power sources are installed and the grid power between the grid power sources; determining a target value of total charging / discharging power to be charged or discharged across the plurality of distributed power sources as a whole based on the acquired information on charging / discharging power and a target value of grid power that is maintained according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the received information related to the distributed power source, including the remaining battery capacity, and the determined target value of the total charge / discharge power; Send the created charge / discharge command to each distributed power source A computer program that causes a computer to execute a process. [Explanation of symbols]

[0070] 1: Distributed power supply 2: 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 communication unit 14: Inverter circuit 15: Relay 16: Relay 17: Relay 18: Remaining battery charge detection IC 19: Power sensor 21: Processing section 22: Storage section 23: Communications Department 24: Power sensor P: Computer Program

Claims

1. a communication unit that can receive information related to a distributed power source, including the remaining battery capacity of the storage batteries, transmitted from a plurality of chargeable and dischargeable distributed power sources having storage batteries connectable to a grid power source, and information related to load power, which is the sum of generated power, charged and discharged power, consumed power, etc. of load elements, power generating elements, power 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 executes processing for controlling the plurality of distributed power sources; Equipped with The processing unit determining a target value for total charging / discharging power, which is the sum of the individual charging power or discharging power of the plurality of distributed power sources, based on the acquired information on load power and a target value for grid power that is maintained according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the information related to the distributed power sources, including the remaining battery power, received by the communication unit and the determined target value of the total charge / discharge power; The communication unit transmits the created charge / discharge command to each distributed power source. Energy storage control device.

2. a communication unit that receives information related to a plurality of chargeable and dischargeable distributed power sources, each having a storage battery connectable to a grid power source, the information including the remaining battery capacity of the storage battery; a processing unit that executes processing for controlling the plurality of distributed power sources; Equipped with The processing unit acquiring information on the grid power between the facility where the plurality of distributed power sources are installed and the grid power source, and information on total charging and discharging power, which is the sum of the individual charging power or discharging power of the plurality of distributed power sources; determining a target value of total charge / discharge power based on the acquired information on the grid power, the target value of the grid power held according to the purpose, and the information on the total charge / discharge power; creating a charge / discharge command for issuing a charge / discharge command based on the information related to the distributed power sources, including the remaining battery power, received by the communication unit and the determined target value of the total charge / discharge power; The communication unit transmits the created charge / discharge command to each distributed power source. Energy storage control device.

3. The processing unit acquiring information on the grid power between the facility where the plurality of distributed power sources are installed and the grid power source, and information on total charging and discharging power, which is the sum of the individual charging power or discharging power of the plurality of distributed power sources; The load power is calculated based on the information related to the grid power and the information related to the total charge / discharge power. The power storage control device according to claim 1 .

4. The processing unit calculating a set value of charge / discharge power to be instructed to each distributed power source by allocating the target value of the total charge / discharge power within a range of the maximum charge / discharge power that each distributed power source can charge / discharge; A charge / discharge command is generated based on the calculated set value. The power storage control device according to claim 1 or 2.

5. The processing unit calculating a first set value of charge / discharge power to be instructed to each distributed power source by allocating the target value of the total charge / discharge power within a range of the maximum charge / discharge power that each distributed power source can charge / discharge; calculating a second set value of charge / discharge power to be instructed to each distributed power source so as to equalize the variation in remaining battery capacity of the storage battery of each distributed power source; generating a charge / discharge command based on the first set value and the second set value; The power storage control device according to claim 1 or 2.

6. The processing unit determining 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 generated based on the set value determined to be equal to or greater than the threshold value. The power storage control device according to claim 4 .

7. The processing unit The target value of the total charge / discharge power is allocated to each distributed power source that is a target of a charge / discharge command based on the set value determined to be equal to or greater than the threshold value, thereby calculating the set value of charge / discharge power to be instructed to each distributed power source. The power storage control device according to claim 6 .

8. The 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 facility where the plurality of distributed power sources are installed and the grid power source. The power sensor outputs an analog signal corresponding to the magnitude and direction of the grid power flowing between the facility and the grid power source. The power sensor converts the analog signal into a digital signal, and the AD converter circuit acquires information related to the grid power. The power storage control device according to claim 1 or 2.

9. a plurality of chargeable and dischargeable distributed power sources each having a storage battery connectable to a grid power source; a power storage control device that controls charging and discharging of the plurality of distributed power sources; A distributed power storage control system comprising: The plurality of distributed power sources include: a power supply communication unit that transmits information related to a remaining battery charge of the storage battery to the power storage control device; The power storage control device includes: a communication unit that receives information transmitted from the plurality of distributed power sources; a processing unit that executes processing for controlling the plurality of distributed power sources; Equipped with The processing unit acquiring information related to the facility where the plurality of distributed power sources are installed and the grid power between the grid power sources; determining a target value of total charging / discharging power to be charged or discharged across the plurality of distributed power sources as a whole based on the acquired information on the grid power and the target value of the grid power held according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the information related to the distributed power sources, including the remaining battery power, received by the communication unit and the determined target value of the total charge / discharge power; The communication unit transmits the created charge / discharge command to each distributed power source. Distributed energy storage control system.

10. receiving information related to a plurality of chargeable and dischargeable distributed power sources, each having a storage battery connectable to a grid power source, including remaining battery capacity of the storage battery; acquiring information related to the facility where the plurality of distributed power sources are installed and the grid power between the grid power sources; determining a target value of total charging / discharging power to be charged or discharged across the plurality of distributed power sources as a whole based on the acquired grid power and information relating to the target value of grid power that is maintained according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the received information related to the distributed power source, including the remaining battery capacity, and the determined target value of the total charge / discharge power; Send the created charge / discharge command to each distributed power source Energy storage control method.

11. receiving information related to a plurality of chargeable and dischargeable distributed power sources, each having a storage battery connectable to a grid power source, including remaining battery capacity of the storage battery; acquiring information related to the facility where the plurality of distributed power sources are installed and the grid power between the grid power sources; determining a target value of total charging / discharging power to be charged or discharged across the plurality of distributed power sources as a whole based on the acquired information on charging / discharging power and a target value of grid power that is maintained according to the purpose; creating a charge / discharge command for issuing a charge / discharge command based on the received information related to the distributed power source, including the remaining battery capacity, and the determined target value of the total charge / discharge power; Send the created charge / discharge command to each distributed power source A computer program that causes a computer to execute a process.

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