Computer program, information processing method, and operation management device

Abstract

Providing computer programs, information processing methods, and operational management devices. [Solution] In a battery storage system configured by connecting multiple banks in parallel, each containing multiple energy storage elements connected in series, at least one computer is made to perform the following processes: acquire the individual SOC for each bank, aggregate the acquired individual SOCs to calculate multiple aggregated SOCs, determine the operational SOC to be used in the battery storage system based on the calculated multiple aggregated SOCs, and display the individual SOCs and operational SOCs in a switchable manner.

Description

[Technical Field]

[0001] This disclosure relates to a computer program, an information processing method, and an operation management device. [Background technology]

[0002] Energy storage systems that store electricity supplied by power generation facilities such as solar and wind power plants, and then supply that stored electricity to loads such as factories and office buildings as needed, are becoming widespread. These energy storage systems are equipped with multiple banks.

[0003] In energy storage systems, it is necessary to manage the charging and discharging of each bank to ensure a stable power supply. In energy storage systems with multiple banks, the State of Charge (SOC) is calculated by a management device for each bank. At the system level, the highest bank SOC, average SOC, and lowest bank SOC are calculated from the SOC calculated for each bank. Higher-level systems such as a Power Conditioning System (PCS) or Energy Management System (EMS) use one SOC selected from the highest, average, and lowest SOCs as an indicator to perform charging and discharging control for each bank. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. 2016 / 135853 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, although the above-mentioned maximum SOC, average SOC, and minimum SOC are important indicators for checking the state of a bank, they do not represent the SOC that can be used by the system. When these SOCs are used as indicators to estimate the chargeable and dischargeable capacity, there is a concern that the discharge will be less than expected, or the system will be shut down while remaining capacity is still left.

[0006] The present disclosure aims to provide a computer program, an information processing method, and an operation management device that can switchably display the individual SOC for each bank and the operation SOC used as an energy storage system. [[Means for Solving the Problem]]

[0007] The computer program of the present disclosure relates to an energy storage system configured by connecting in parallel a plurality of banks each formed by connecting a plurality of energy storage elements in series, and is a computer program for causing at least one computer to execute at least the following processes: acquiring individual SOC for each bank; aggregating the acquired individual SOC to calculate a plurality of aggregated SOCs; determining an operation SOC used in the energy storage system based on the calculated plurality of aggregated SOCs; and switchably displaying the individual SOC and the operation SOC. [[Effects of the Invention]]

[0008] According to the present disclosure, the individual SOC for each bank and the operation SOC used as an energy storage system can be switchably displayed. [[Brief Description of the Drawings]]

[0009] [Figure 1] FIG. 1 is a schematic diagram illustrating the overall configuration of a monitoring system according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating a configuration example of an energy storage system. [Figure 3] FIG. 3 is an explanatory diagram illustrating the internal configuration of a storage battery panel. [Figure 4] FIG. 4 is an explanatory diagram illustrating the internal configuration of a PCS panel. [Figure 5]This is a block diagram showing the internal configuration of the control device. [Figure 6] This is a block diagram showing the internal configuration of a remote monitoring system. [Figure 7] This is a block diagram showing the internal configuration of the user terminal. [Figure 8] This is an explanatory diagram outlining the methodology for determining the operational SOC (Security Operations Center). [Figure 9] This is an explanatory diagram detailing the calculation method for operational SOC in the high SOC domain. [Figure 10] This is an explanatory diagram detailing the calculation method for operational SOC in the low SOC region. [Figure 11] This flowchart shows the steps of the process performed by the management device. [Figure 12] This flowchart shows the steps of the process performed by the management device. [Figure 13] This is a schematic diagram showing an example of a display screen for showing the operational SOC. [Figure 14] This is a schematic diagram showing an example of a display screen for individual SOCs. [Modes for carrying out the invention]

[0010] (1) The computer program of this disclosure is a computer program that causes at least one computer to perform the following processes with respect to an energy storage system configured by connecting multiple banks in parallel, each of which is a bank in which multiple energy storage elements are connected in series: acquire individual SOCs for each bank, aggregate the acquired individual SOCs to calculate multiple aggregate SOCs, determine an operational SOC to be used in the energy storage system based on the calculated multiple aggregate SOCs, and display the individual SOCs and the operational SOCs in a switchable manner.

[0011] An energy storage system is installed alongside power generation facilities such as solar power generation facilities and wind power generation facilities. It stores the electricity supplied from the power generation facilities and supplies the stored electricity to the load. An example of an energy storage system is an ESS (Energy Storage System). Alternatively, an energy storage system may be a power conditioner or a backup power supply unit.

[0012] The energy storage system comprises multiple banks connected in parallel. Each bank consists of multiple battery modules connected in series. The energy storage system includes a management unit (bank BMU) for each bank to monitor or control the multiple banks. The energy storage system further includes a higher-level management unit (domain BMU) to monitor or control the multiple banks.

[0013] Each bank BMU acquires measurement data, such as current, for its corresponding bank, and calculates the State of Charge (SOC) for that bank based on the acquired measurement data. The current integration method is often used to calculate the SOC. In energy storage systems with multiple banks, an individual SOC is calculated for each bank. The individual SOC calculated for each bank is important as an indicator of the state of each bank.

[0014] Generally, there are individual differences between banks, and the degree of degradation also differs from bank to bank, so the calculated individual SOC will vary between banks. For this reason, if the charge / discharge capacity of the energy storage system is estimated using one of the individual SOCs, or the average value (highest or lowest value) of the individual SOCs, and the system's charge / discharge is controlled accordingly, there is a concern that the system may not be able to discharge as much as expected, or that the system may be shut down with excess capacity remaining.

[0015] According to the computer program described in (1) above, the individual SOC for each bank and the operational SOC used for the energy storage system can be switched and displayed. For example, by providing an operational SOC display screen to an administrator who manages the charging and discharging of the energy storage system, it is possible to avoid situations where the system cannot be discharged as much as expected or where the system is shut down with excess capacity remaining. On the other hand, by providing an individual SOC display screen to workers who perform maintenance and inspections of the energy storage system, it can be useful for maintenance and inspections.

[0016] (2) The computer program described in (1) above may also be a computer program that causes the computer to perform a process of generating screen information for a display screen that can switch between the individual SOC and the operational SOC, and outputting the generated screen information to an output destination device.

[0017] According to the computer program described in (2) above, the display screen information of the display screen is generated and the generated screen information is output to the output device, thereby allowing the display screen of the individual SOC or the operational SOC to be displayed on the output device.

[0018] (3) The computer program described in (1) or (2) above may be a computer program that causes the computer to display on the output destination device either the display screen of the individual SOC or the operational SOC selected according to the output destination device, and when the output destination device accepts a switching operation, causes the computer to execute a process to switch from the one display screen to the other display screen.

[0019] According to the computer program described in (3) above, when a switching operation is received at the output device, the display screen is switched from the individual SOC to the operational SOC, or from the operational SOC to the individual SOC.

[0020] (4) The computer program described in any one of (1) to (3) above may be a computer program that causes the computer to perform a process to determine the operational SOC such that, in the high SOC region where the highest SOC is equal to or greater than a first set value, the average SOC approaches the highest SOC as charging progresses.

[0021] According to the computer program described in (4) above, in the high SOC region, as charging progresses, the operating SOC of the entire energy storage system is determined so that it approaches the maximum SOC from the average SOC calculated from the individual SOCs.

[0022] (5) The computer program described in any one of (1) to (4) above may be a computer program that causes the computer to perform a process to determine the operational SOC such that, in the low SOC region where the minimum SOC is less than or equal to the second set value, the average SOC is closer to the minimum SOC from the average SOC as discharge progresses.

[0023] According to the computer program in (5) above, in the low SOC region, as discharge progresses, the operating SOC of the entire energy storage system is determined so that it approaches the minimum SOC from the average SOC calculated from the individual SOCs.

[0024] (6) The computer program described in any one of (1) to (5) above may be a computer program that causes the computer to perform a process to determine the operational SOC such that it is equal to the average SOC in the intermediate SOC region where the highest SOC is less than the first set value and the lowest SOC is greater than the second set value.

[0025] According to the computer program in (6) above, in the intermediate SOC region, the average SOC obtained from individual SOCs is defined as the operating SOC of the entire energy storage system.

[0026] (7) The computer program described in any one of (1) to (6) above may be a computer program that sets an upper limit SOC and a lower limit SOC in the energy storage system, and causes the computer to perform a process to determine the operational SOC using the converted SOC calculated based on the upper limit SOC and the lower limit SOC.

[0027] According to the computer program described in (7) above, the upper and lower limits of the energy storage system's SOC are set, so the operating SOC can be defined so as not to exceed the upper limit SOC and not to fall below the lower limit SOC.

[0028] (8) In the computer program described in any one of (1) to (7) above, the energy storage system may be a system for storing electricity that is bought and sold in the electricity market.

[0029] According to the computer program described in (8) above, the amount of electricity that can be extracted from the energy storage system can be easily estimated.

[0030] (9) The information processing method of the present disclosure relates to an energy storage system configured by connecting multiple banks in parallel, each of which is a bank in which multiple energy storage elements are connected in series. The method performs the following processes using at least one computer: acquire individual SOCs for each bank; aggregate the acquired individual SOCs to calculate multiple aggregate SOCs; determine an operational SOC to be used in the energy storage system based on the calculated multiple aggregate SOCs; and display the individual SOCs and the operational SOCs in a switchable manner.

[0031] According to the information processing method described in (9) above, the individual SOC for each bank and the operational SOC used for the energy storage system are displayed in a switchable manner. For example, by providing an operational SOC display screen to an administrator who manages the charging and discharging of the energy storage system, it is possible to avoid situations where the system cannot be discharged as much as expected or where the system is shut down with remaining capacity. On the other hand, by providing an individual SOC display screen to workers who perform maintenance and inspection of the energy storage system, it can be useful for maintenance and inspection.

[0032] (10) The operation management device of the present disclosure comprises at least one processing unit, the processing unit acquires an individual SOC for each bank with respect to an energy storage system configured by connecting a plurality of banks in parallel, each of which is a plurality of energy storage elements connected in series, aggregates the acquired individual SOCs to calculate a plurality of aggregated SOCs, determines an operation SOC to be used in the energy storage system based on the calculated plurality of aggregated SOCs, and outputs screen information of a display screen that switches between displaying the individual SOCs and the operation SOC to an output destination device.

[0033] According to the operation management device described in (10) above, the individual SOC for each bank and the operational SOC used for the energy storage system can be switched and displayed. For example, by providing an operational SOC display screen to an administrator who manages the charging and discharging of the energy storage system, it is possible to avoid situations where the system cannot be discharged as expected or where the system is shut down with remaining capacity. On the other hand, by providing an individual SOC display screen to workers who perform maintenance and inspection of the energy storage system, it can be useful for maintenance and inspection.

[0034] The present invention will be described in detail below with reference to the drawings illustrating its embodiments. Figure 1 is a schematic diagram showing the overall configuration of a monitoring system according to an embodiment. The monitoring system according to the embodiment comprises a power storage device 1, a remote monitoring system 2, and a user terminal 3. The power storage device 1 is, for example, an ESS, which stores electricity supplied from a power generation facility PG and supplies the stored electricity to a load PC. The power generation facility PG includes solar power generation facilities, wind power generation facilities, etc. The load PC includes power consuming facilities such as factories, office buildings, schools, hospitals, restaurants, and airports.

[0035] The energy storage facility 1 may store electricity supplied from the power generation facility PG and supply the stored electricity to the power grid PS. The energy storage facility 1 may also store electricity supplied from the power grid PS and supply the stored electricity to the load PC.

[0036] The energy storage system 1 comprises multiple energy storage systems 1A, 1B, and 1C, each consisting of a battery panel 10 and a PCS panel 11. In the example shown in Figure 1, the energy storage system 1 is composed of three energy storage systems 1A to 1C. Alternatively, the energy storage system 1 may consist of one or two energy storage systems, or four or more energy storage systems.

[0037] Energy storage facility 1 continuously measures and manages the State of Charge (SOC), temperature, power, etc., in energy storage systems 1A to 1C. Energy storage facility 1 notifies the remote monitoring system 2 and user terminal 3 of the SOC, temperature, power, etc. data it manages via the communication network NW.

[0038] Remote monitoring system 2 is, for example, an EMS (Energy Management System). Remote monitoring system 2 acquires measurement data such as SOC (State of Charge), temperature, and power from energy storage systems 1A to 1C via a communication network NW (Network Network) and displays it on a monitor.

[0039] User terminal 3 is a terminal device such as a personal computer or tablet used by, for example, a maintenance worker (hereinafter simply referred to as "worker") of the energy storage equipment 1. User terminal 3 acquires measurement data such as SOC, temperature, and power from the energy storage systems 1A to 1C via the communication network NW and displays it on a monitor.

[0040] Figure 2 is a schematic diagram showing an example configuration of the energy storage system 1A, Figure 3 is an explanatory diagram illustrating the internal configuration of the battery panel 10, and Figure 4 is an explanatory diagram illustrating the internal configuration of the PCS panel 11. The energy storage system 1A comprises 10 battery panels 10 and 1 PCS panel 11. Each battery panel 10 has a housing with a door and contains 3 banks 101 inside the housing. The 3 banks 101 are connected in parallel. Each bank 101 is configured by electrically connecting a total of 18 energy storage elements (battery modules BT) in series in two vertical rows.

[0041] The battery module BT is constructed by connecting multiple battery cells in series. In one example, the battery cells are lithium-ion secondary batteries. Alternatively, the battery cells may be solid-state batteries, lead-acid batteries, redox flow batteries, zinc-air batteries, alkaline manganese batteries, lithium-sulfur batteries, sodium-sulfur batteries, silver-zinc oxide batteries, nickel-metal hydride batteries, molten salt thermal batteries, etc., or they may be capacitors. The number of battery cells constituting the battery module BT is designed as appropriate.

[0042] In this embodiment, we will describe the number of battery panels 10 constituting the energy storage system 1A as 10 units, the number of banks 101 provided by each battery panel 10 as 3 units, and the number of battery modules BT connected to each bank 101 as 18 units. However, these numbers and quantities can be designed as appropriate. Figure 2 shows an example configuration of the energy storage system 1A, but the same applies to energy storage systems 1B and 1C. The group of banks installed in each energy storage system 1A to 1C is also called a domain.

[0043] <Battery panel 10> The battery storage panel 10 comprises three banks 101 and a Bank BMU (Battery Management Unit) 102 provided for each bank 101. The banks 101 are connected to an external PCS panel 11 via a main circuit MC. The main circuit MC has a main path P1 connected to the PCS panel 11 and branch paths P2 that branch off from the main path P1 and connect to each bank 101. A switch for switching the target of charging and discharging may be provided in the branch paths P2.

[0044] The power source for bank 101 is the power generation equipment PG (or power grid PS). Bank 101 receives power supplied from the power generation equipment PG, etc., through the PCS panel 11 and the main circuit MC, and stores (charges) the battery module BT. The power supply destination for bank 101 is the load PC (or power grid PS). Bank 101 supplies (discharges) the power stored in the battery module BT to an external power supply destination through the main circuit MC and the PCS panel 11.

[0045] Each bank 101 is equipped with a current sensor SA, a voltage sensor SV, and a temperature sensor ST. The current sensor SA is an existing current sensor such as a Hall sensor, and measures the current flowing through each bank 101 in a time series. The voltage sensor SV is an existing voltmeter, and measures the voltage of each bank 101 in a time series. The temperature sensor ST is an existing temperature sensor such as a thermistor, and measures the temperature in a time series. In the example in Figure 3, a configuration is shown in which a temperature sensor ST is provided for each bank 101, but one or more temperature sensors ST may be provided to measure the temperature at one or more locations inside the housing of the battery panel 10, or a temperature sensor ST may be provided for each battery module BT in order to measure the temperature of each battery module BT. The current sensor SA, voltage sensor SV, and temperature sensor ST output the measurement data to bank BMU 102.

[0046] The bank BMU 102 is a management device for managing the state of the corresponding bank 101. The bank BMU 102 acquires time-series data of electrical values (current and voltage) or temperature, which are sensor outputs from the current sensor SA, the voltage sensor SV, and the temperature sensor ST. The bank BMU 102 manages the state of the bank 101 based on the acquired time-series data of electrical values or temperature. For example, the bank BMU 102 manages the state of the bank 101 at each time by calculating the SOC and other parameters of the bank 101 based on the acquired time-series data of electrical values or temperature. An existing method such as the current integration method is used for the SOC calculation method. The SOC for each bank 101 calculated by the bank BMU 102 is referred to as an individual SOC hereinafter. The bank BMU 102 notifies the control unit 100 of the acquired time-series data such as current, voltage, and temperature, and the calculated SOC data of the bank 101. The bank BMU 102 may control the start and stop of charging and discharging according to the state of the bank 101 it manages.

[0047] The control unit 100 is a control device for managing and controlling the state of the bank 101 included in each storage battery panel 10. The control unit 100 includes a communication interface for communicating with the management device 110 of the PCS panel 11. An existing communication standard such as CAN (Controller Area Network) is used for communication between the control unit 100 and the management device 110. Alternatively, a communication standard such as LIN (Local Interconnect Network), ECHONET (registered trademark), or ECHONET Lite (registered trademark) may be used. The control unit 100 transmits time-series data such as current, voltage, and temperature acquired via each bank BMU 102, individual SOC data calculated by each bank BMU 102, and the like to the management device 110 of the PCS panel 11.

[0048] <PCS盤11> The PCS panel 11 is a device for converting power transferred between any two of the power generation facility PG, the power system PS, the load PC, and the storage battery panel 10 into power (DC power or AC power) of a magnitude required by the supply destination.

[0049] The PCS panel 11 includes conversion units CN1 to CN3 and a control device 110. Conversion unit CN1 is a converter that converts power (DC power or AC power) supplied from the power generation equipment PG into DC power of the required magnitude. Conversion unit CN2 is a bidirectional converter that converts DC power input through conversion unit CN1 into DC power of the required magnitude, and also converts DC power output by the battery panel 10 into DC power of the required magnitude. Conversion unit CN3 is an inverter that converts DC power supplied by the power generation equipment PG via conversion unit CN1 and DC power supplied by the battery panel 10 via conversion unit CN2 into AC power of the required magnitude.

[0050] The control device 110 controls the operation of the PCS panel 11 and manages the state (SOC, temperature, power, etc.) of the battery panel 10 connected to the PCS panel 11. In this embodiment, the control device 110 is located inside the PCS panel 11. Alternatively, the control device 110 may be located outside the PCS panel 11.

[0051] Figure 5 is a block diagram showing the internal configuration of the management device 110. The management device 110 is a dedicated or general-purpose computer and includes a control unit 111, a storage unit 112, a communication unit 113, an operation unit 114, a display unit 115, and the like.

[0052] The control unit 111 is a processing circuit or arithmetic circuit equipped with a CPU, ROM, RAM, etc. The CPU of the control unit 111 controls the various hardware parts by reading and executing various computer programs stored in the ROM or storage unit 112, thereby making the entire device function as an operation management device in this disclosure.

[0053] Alternatively, the control unit 111 may be any arithmetic circuit equipped with multiple CPUs, a multi-core CPU, a GPU (Graphics Processing Unit), a microcontroller, volatile or non-volatile memory, etc. The control unit 111 may also include functions such as a timer for measuring the elapsed time from the time a measurement start instruction is given until a measurement end instruction is given, a counter for counting numbers, and a clock for outputting date and time information.

[0054] The storage unit 112 includes a storage device such as a hard disk or flash memory. Various computer programs and data are stored in the storage unit 112. The computer programs (program products) stored in the storage unit 112 include an operation management program PG1 that causes at least one computer to execute a process that acquires individual SOCs for each bank 101, aggregates the acquired individual SOCs to calculate multiple aggregated SOCs, determines the operational SOC to be used for the energy storage systems 1A to 1C based on the calculated multiple aggregated SOCs, and displays the individual SOCs and operational SOCs in a switchable manner.

[0055] The computer program, including the operation management program PG1, is provided on a non-temporary recording medium RM on which the computer program is recorded in a readable format. The recording medium RM is a portable memory such as a CD-ROM, USB (Universal Serial Bus) memory, SD (Secure Digital) card, microSD card, or CompactFlash®. In this case, the control unit 111 reads the computer program from the recording medium RM using a reading device (not shown in the figure) and installs the read computer program into the storage unit 112. Alternatively, the computer program may be provided via communication. In this case, the control unit 111 downloads the computer program via the communication unit 113 and installs the downloaded computer program into the storage unit 112.

[0056] The operation management program PG1 may be a single computer program or may consist of multiple computer programs. The operation management program PG1 may partially utilize existing libraries. The operation management program PG1 may run on a single computer or run collaboratively by multiple computers. The operation management program PG1 may also work in conjunction with other computer programs implemented on external computers to perform necessary processing.

[0057] The communication unit 113 is equipped with a communication interface for communicating with each battery panel 10. Communication networks such as CAN, LIN, ECHONET®, and ECHONETLight® are used for communication between the communication unit 113 and each battery panel 10. The communication unit 113 sends and receives various types of data to and from each battery panel 10 via a communication network such as CAN.

[0058] The communication unit 113 further includes a communication interface for connecting to a communication network NW. The communication interface provided by the communication unit 113 is either a wireless communication interface such as WiFi (registered trademark), 3G, 4G, 5G, or LTE (Long Term Evolution), or a wired communication interface such as Ethernet (registered trademark). The communication unit 113 transmits and receives various types of data to and from external computers (remote monitoring system 2, user terminal 3, etc.) via the communication network NW.

[0059] Each of the PCS panels 11 provided in each of the energy storage systems 1A to 1C may communicate with an external computer independently. Alternatively, one of the PCS panels 111 may communicate with the external computer on behalf of the others. In the latter case, a communication network is established to enable communication between the representative PCS panel 111 and the other PCS panels 111. The representative PCS panel 111 transmits various data received from the other PCS panels 111 to the external computer and transmits various data received from the external computer to the other PCS panels 111.

[0060] The operation unit 114 is equipped with input devices such as a keyboard or mouse and accepts operations from administrators, etc. The display unit 115 is equipped with a display device such as a liquid crystal display and displays information that should be notified to administrators, etc. Alternatively, the management device 110 may be configured to accept necessary operations via an external computer and transmit information that should be notified to administrators, etc. to the external computer. In this case, the management device 110 does not need to be equipped with the operation unit 114 and the display unit 115.

[0061] In this embodiment, the management device 110 may be a computer system composed of multiple computers and peripheral devices, or it may be a single computer. Alternatively, the management device 110 may be a virtual machine with a virtualized entity, or it may be a cloud.

[0062] Figure 6 is a block diagram showing the internal configuration of the remote monitoring system 2. The remote monitoring system 2 is a computer system such as an EMS that remotely monitors the energy storage equipment 1, and includes a control unit 201, a memory unit 202, a communication unit 203, an operation unit 204, a display unit 205, and the like.

[0063] The control unit 201 is a processing circuit or arithmetic circuit equipped with a CPU, ROM, RAM, etc. The CPU of the control unit 201 controls the various hardware parts by reading and executing various computer programs stored in the ROM or storage unit 202, thereby causing the entire device to function as one of the output destination devices in this disclosure.

[0064] The storage unit 202 includes a storage device such as a hard disk or flash memory. Various computer programs and data are stored in the storage unit 202. The computer programs stored in the storage unit 202 include a display program PG2 for displaying various information provided by the energy storage equipment 1 on the display unit 205. The display program PG2 may be a dedicated program or a general-purpose program such as a web browser.

[0065] The communication unit 203 is equipped with a communication interface that connects to the communication network NW. The communication interface provided by the communication unit 203 is a wireless communication interface such as WiFi (registered trademark), 3G, 4G, 5G, or LTE (Long Term Evolution), or a wired communication interface such as Ethernet (registered trademark). The communication unit 203 transmits and receives various types of data to and from the energy storage equipment 1 via the communication network NW.

[0066] The control unit 204 is equipped with input devices such as a keyboard and mouse, and accepts operations from administrators, etc. The display unit 205 is equipped with a display device such as a liquid crystal display, and displays information that should be communicated to administrators, etc.

[0067] Figure 7 is a block diagram showing the internal configuration of the user terminal 3. The user terminal 3 is a computer such as a personal computer or tablet terminal used by workers, and includes a control unit 301, a storage unit 302, a communication unit 303, an operation unit 304, a display unit 305, and the like.

[0068] The control unit 301 is a processing circuit or arithmetic circuit equipped with a CPU, ROM, RAM, etc. The CPU of the control unit 301 controls the various hardware parts by reading and executing various computer programs stored in the ROM or storage unit 302, thereby causing the entire device to function as one of the output destination devices in this disclosure.

[0069] The storage unit 302 includes a storage device such as a hard disk or flash memory. Various computer programs and data are stored in the storage unit 302. The computer programs stored in the storage unit 302 include a display program PG3 for displaying various information provided by the energy storage equipment 1 on the display unit 305. The display program PG3 may be a dedicated program or a general-purpose program such as a web browser.

[0070] The communication unit 303 is equipped with a communication interface that connects to the communication network NW. The communication interface provided by the communication unit 303 is a wireless communication interface such as WiFi (registered trademark), 3G, 4G, 5G, or LTE (Long Term Evolution), or a wired communication interface such as Ethernet (registered trademark). The communication unit 303 transmits and receives various types of data to and from the energy storage equipment 1 via the communication network NW.

[0071] The control unit 304 is equipped with input devices such as a keyboard and mouse, and accepts operations from operators. The display unit 305 is equipped with a display device such as a liquid crystal display, and displays information that should be communicated to operators.

[0072] The remote monitoring system 2 and the user terminal 3 display, in a switchable manner, the individual SOC of each bank 101 installed in the energy storage equipment 1 and the system-wide operational SOC. The calculation method for the operational SOC is described below.

[0073] Figure 8 is an explanatory diagram illustrating the general method for determining the operational SOC. The bank BMU 102 mounted on the battery panel 10 acquires time-series data obtained by measuring the current, voltage, temperature, etc., of the corresponding bank 101. Based on the acquired time-series data, the bank BMU 102 calculates the SOC (individual SOC) of each bank 101. In this embodiment, the bank BMU 102 calculates the individual SOC using the current integration method. The bank BMU 102 calculates the SOC by integrating the current values ​​measured by the current sensor SA to determine the amount of charge entering and leaving bank 101, and then dividing by the total charge amount (full charge capacity) of bank 101.

[0074] Alternatively, bank BMU102 may calculate the SOC using a voltage method that uses the relationship between terminal voltage or OCV (Open Circuit Voltage) and SOC, or a model-based calculation method that uses a model such as an equivalent circuit model or a Kalman filter. Bank BMU102 notifies the control unit 100 of the calculated individual SOC.

[0075] The management device 110 obtains the individual SOC calculated by the bank BMU 102 of each battery panel 10 from the control unit 100. If the number of banks 101 installed in each of the energy storage systems 1A to 1C is n, the individual SOC is BMU-SOC bank1 BMU-SOC bank2 ,…,BMU-SOC bankn It is written as follows.

[0076] The control unit 111 of the management device 110 aggregates the individual SOCs acquired for each bank 101 and calculates the aggregated SOC. Specifically, the control unit 111 calculates the highest value of the individual SOCs, which is the maximum SOC (= BMU-SOC). max ), the average SOC (=BMU-SOC) ave ), and the lowest value, the minimum SOC (=BMU-SOC) min Calculate ).

[0077] The control unit 111 may calculate a converted SOC based on the upper and lower limits of SOC in each energy storage system 1A to 1C. The upper and lower limits of SOC are set as the upper and lower limits of the individual SOC that can be used as energy storage systems 1A to 1C. Here, the upper limit of the individual SOC represents the SOC when power is limited by the power limiting function of energy storage systems 1A to 1C, or when charging is stopped due to a rise in cell voltage. The lower limit of the individual SOC represents the SOC near the lower limit of discharge of energy storage systems 1A to 1C, or when discharge is stopped due to a drop in cell voltage. The upper and lower limits of SOC may be set individually for each of the energy storage systems 1A to 1C, or they may be set as a common value for energy storage systems 1A to 1C. up , lower limit SOC low If the SOC before conversion is expressed as BMU-SOC, the converted SOC is calculated using the following equation 1.

[0078]

number

[0079] According to Equation 1, when the individual SOC matches the lower limit SOC, the converted SOC is 0%, and when the individual SOC matches the upper limit SOC, the converted SOC is 100%.

[0080] The control unit 111 converts each aggregated SOC according to Equation 1, and obtains the maximum SOC which is the maximum value of the converted SOC (= converted SOC max ), the average SOC which is the average value (= converted SOC ave ), and the minimum SOC which is the minimum value (= converted SOC min ).

[0081] The control unit 111 determines whether the current state belongs to any one of a high SOC region, an intermediate SOC region, and a low SOC region. For example, the control unit 111 determines that the current state belongs to the high SOC region if the converted SOC max is equal to or greater than a first set value (e.g., 90%), and determines that the current state belongs to the low SOC region if the converted SOC min is equal to or less than a second set value (e.g., 10%). The control unit determines that the current state belongs to the intermediate SOC region if the converted SOC max is less than the first set value and the converted SOC min is greater than the second set value.

[0082] The control unit 111 determines the operating SOC according to which of the high SOC region, the intermediate SOC region and the low SOC region the current state belongs to. For example, when it is determined that the current state belongs to the high SOC region, the control unit 111 determines the operating SOC so as to approach the maximum SOC from the average SOC as charging progresses. When it is determined that the current state belongs to the low SOC region, the control unit 111 determines the operating SOC so as to approach the minimum SOC from the average SOC as discharging progresses. When it is determined that the current state belongs to the intermediate SOC region, the control unit 111 determines the operating SOC to be equal to the average SOC.

[0083] In this embodiment, when the operational SOC is determined using the individual SOC calculated by the current integration method, the resulting operational SOC is an SOC based on the current integration value (first operational SOC). The control unit 111 may convert the SOC based on the current integration value (first operational SOC) to an SOC based on energy consumption (second operational SOC). In Figure 8, the first operational SOC based on the current integration value is denoted as first operational SOC(Ah), and the second operational SOC based on energy consumption is denoted as second operational SOC(Wh). The control unit 111 notifies the management device 110 of the individual SOC and the operational SOC (first operational SOC or second operational SOC).

[0084] Figure 9 is an explanatory diagram illustrating the details of the calculation method for operational SOC in the high SOC region. In order to avoid the operational SOC not reaching 100% (or 99.9%) due to variations in multiple banks 101, the control unit 111 calculates the converted SOC max In areas where the percentage exceeds 90% (high SOC area), the equivalent SOC max As it rises from 90%, the converted SOC ave Converted from SOC max The control unit 111 outputs an operational SOC that approaches linearity. Specifically, in the high SOC region, the control unit 111 outputs an operational SOC calculated according to the following equation 2.

[0085]

number

[0086] As shown in Figure 9, the converted SOC during charging max In the intermediate SOC region until it reaches 90%, the operational SOC is equivalent to the equivalent SOC. ave It is equal to the value, but it enters the high SOC region, and the converted SOC max As it rises from 90%, the operational SOC becomes the equivalent SOC. ave Converted from SOC max Approaching.

[0087] Figure 10 is an explanatory diagram illustrating the details of the calculation method for operational SOC in the low SOC region. In order to avoid the operational SOC not reaching 0% (or 0.1%) due to variations in multiple banks 101, the control unit 111 calculates the converted SOC min In the region where it is 10 or less (low SOC region), the converted SOC min As it decreases from 10%, the equivalent SOC ave Converted from SOC min The control unit 111 outputs an operational SOC that approximates a linear relationship to the given value. Specifically, in the low SOC region, the control unit 111 outputs an operational SOC calculated according to the following equation 3.

[0088]

number

[0089] As shown in Figure 10, the converted SOC during discharge min In the intermediate SOC region until it reaches 10%, the operational SOC is equivalent to the equivalent SOC. ave It is equal to the value, but falls into the low SOC region, and the converted SOC min As it decreases from 10%, the operational SOC becomes the equivalent SOC. ave Converted from SOC min Approaching.

[0090] For the intermediate SOC region between the high SOC region and the low SOC region, the control unit 111 calculates the converted SOC using Equation 1. ave We have decided to designate it as the operational SOC.

[0091] The control unit 111 converts SOC max For the range of 90% to 99.9%, the operational SOC can be calculated using equation 2, and if the upper limit of what can be charged as energy storage system 1 is reached, the operational SOC at that time may be set to 100%.

[0092] Specifically, the control unit 111 should reset the operational SOC to 100% when it detects a state in which power is limited by the power limiting function of the energy storage system 1A to 1C, or a state in which charging is stopped due to an increase in cell voltage. For example, the control unit 111 should reset the operational SOC to 100% when any of the following four conditions are met. (1) When an increase in cell voltage is detected (2) When, during charging operation and current integration, it is detected that the current of bank 101, which has the highest bank voltage, is 1A or less, and the highest cell voltage is 4.2V or higher for 10 seconds: (3) BMU-SOC after OCV reset max ≥SOC up If detected (4) At the previous timing, the operational SOC was 100% and the current BMU-SOC max ≥SOC up If detected

[0093] The control unit 111 converts SOC min For values ​​between 10% and 0.1%, the operational SOC can be calculated using equation 3, and if it reaches the lower limit of discharge possible as energy storage system 1, the operational SOC at that point may be set to 0%.

[0094] Specifically, the control unit 111 should reset the operational SOC to 0% when it detects that the energy storage system 1A to 1C is near its lower discharge limit, or that the discharge should be stopped due to a decrease in cell voltage. For example, the control unit 111 should reset the operational SOC to 0% when any of the following three conditions are met. (1) When a decrease in cell voltage is detected (2) If it is detected that the average cell voltage of domain 110 has remained above 3.2V for 10 seconds. (3) At the previous timing, the operational SOC was 0% and the current BMU-SOC min ≦SOC low If detected

[0095] Figures 11 and 12 are flowcharts showing the processing steps performed by the management device 110. While the energy storage system 1 is operating, the current flowing through each bank 101 is measured in time series by the current sensor SA. Each bank BMU 102 acquires the measured values ​​(time series data) from the current sensor SA and calculates the SOC (individual SOC) of the corresponding bank 101 using the current integration method. Each bank BMU 102 outputs the calculated individual SOC to the control unit 100 at an appropriate timing.

[0096] The following describes the processing performed by the management device 110 installed in the energy storage system 1A. The control unit 111 of the management device 110 reads the operation management program PG1 from the storage unit 112 and executes it, thereby performing the following processing. The control unit 111 acquires the individual SOC of each bank BMU 102 from the control unit 100 of each battery panel 10 installed in the energy storage system 1A (step S101). In this embodiment, the energy storage system 1A is equipped with 10 battery panels 10, and each battery panel 10 is equipped with 30 banks 101, so individual SOCs for 30 units are obtained. The individual SOC acquired in step S101 is, for example, an SOC based on the integrated current value.

[0097] The control unit 111 aggregates the acquired individual SOCs and calculates multiple aggregated SOCs (step S102). Specifically, the control unit 111 calculates the highest SOC, the average SOC, and the lowest SOC among the individual SOCs.

[0098] The control unit 111 converts the calculated aggregated SOC to a converted SOC (step S103). The control unit 111 converts the energy storage system 1A upper limit SOC which is set in advance. up and lower limit SOC low Using this, the aggregated SOC is converted to the converted SOC using Equation 1, and the converted SOC max , conversion SOC ave , and converted SOC min Obtain it.

[0099] In this flowchart, the control unit 111 calculates the aggregated SOC, and then converts the aggregated SOC to calculate the converted SOC. Alternatively, the control unit 111 may calculate the converted SOC by converting the individual SOCs, and then calculate the aggregated SOC from the calculated converted SOC.

[0100] The control unit 111 determines whether the current energy storage system 1A belongs to the high SOC region (step S104). The control unit 111 determines the converted SOC max If the value is equal to or greater than the first set value (e.g., 90%), it is determined to belong to the high SOC region. The first set value is not limited to 90% and can be set as appropriate.

[0101] If the current energy storage system 1A is determined to be in the high SOC region (S104: YES), the control unit 111 determines whether or not to reset the operational SOC to 100% (step S105). Specifically, the control unit 111 determines to reset the operational SOC to 100% if it detects a state in which power is limited by the power limiting function of energy storage systems 1A to 1C, or a state in which charging is stopped due to an increase in cell voltage. For example, the control unit 111 determines to reset the operational SOC to 100% if (1) an increase in cell voltage is detected, (2) during charging operation and current integration the current of bank 101, which has the highest bank voltage, is 1A or less and the highest cell voltage is 4.2V or higher for 10 seconds, or (3) after OCV reset the BMU-SOC max ≥SOC up If this is detected, and (4) at the previous timing the operational SOC was 100% and the current BMU-SOC max ≥SOC up If any one of the conditions for detection is met, it will be decided to reset the operational SOC to 100%.

[0102] If it is determined to reset the operational SOC to 100% (S105: YES), the control unit 111 determines the operational SOC of the energy storage system 1A to be 100% at that time (step S106). When the operational SOC is reset to 100%, the cell voltage is close to the upper limit (around 4.209V), and the charging current is sufficiently reduced to around 1A. If charging continues after resetting the operational SOC to 100%, the current value may fluctuate slightly around 1A, or the operational SOC may repeatedly fluctuate between 100% and 99.9% in short cycles due to the release of the charging state. Also, if charging is stopped, the current value may exceed 1A, causing the system to move to the calculation step for the high SOC region, and the operational SOC may return to 99.9%. To avoid the above, after resetting the operational SOC to 100%, the control unit 100 maintains the operational SOC at 100% as long as the maximum SOC is greater than or equal to the upper limit SOC.

[0103] If it is determined that the operational SOC should not be reset to 100% (S105: NO), the control unit 111 will, as charging progresses, calculate the average SOC (converted SOC) ave ) up to the highest SOC (equivalent SOC) max The operational SOC is determined to approach (step S107). Specifically, the control unit 111 calculates the operational SOC in the high SOC region according to equation 2.

[0104] In step S104, if it is determined that the current energy storage system 1A does not belong to the high SOC region (S104: NO), the control unit 111 determines whether the current energy storage system 1A belongs to the low SOC region (step S108). The control unit 111 determines the converted SOC min If the second setting value (e.g., 10%) is below this value, it is determined to belong to the low SOC region. The second setting value is not limited to 10% and can be set as appropriate.

[0105] If the control unit 111 determines that the current energy storage system 1A is in the low SOC region (S108: YES), it determines whether or not to reset the operational SOC to 0% (step S109). Specifically, the control unit 111 determines to reset the operational SOC to 0% if it detects that the energy storage system 1A is near the discharge limit or that discharge will stop due to a decrease in cell voltage. For example, the control unit 111 should reset the operational SOC to 0% if any of the following three conditions are met: For example, the control unit 111 may reset the operational SOC to 0% if (1) a decrease in cell voltage is detected, (2) the average cell voltage of domain 110 has remained above 3.2V for 10 seconds, and (3) the operational SOC was 0% at the previous timing and the current BMU-SOC min ≦SOC low If any one of the conditions for detection is met, it is decided to reset the operational SOC to 0%.

[0106] If it is determined to reset the operating SOC to 0% (S109: YES), the control unit 111 sets the operating SOC of the energy storage system 1A to 0% at that time (step S110). If discharge is stopped when the operating SOC is 0%, the cell voltage will rise. When the average cell voltage exceeds 3.2V, the operating SOC will rise from 0% to 0.1%. That is, since the OCV at which the operating SOC is 0% is about 3.4V, in most cases the reset of the operating SOC to 0% will only work for a moment and then immediately return to 0.1%. To avoid the above, the control unit 111 maintains the operating SOC at 0% as long as the minimum SOC is below the lower limit SOC.

[0107] If it is determined not to reset the operating SOC to 0% (S109: NO), the control unit 111 will, as discharge progresses, calculate the average SOC (converted SOC) ave ) from the minimum SOC (equivalent SOC) min The operational SOC is determined to approach (step S111). Specifically, the control unit 111 calculates the operational SOC in the low SOC region according to Equation 3.

[0108] In step S108, if it is determined that the current energy storage system 1A does not belong to the low SOC region (S108: NO), that is, if it is determined that it belongs to an intermediate SOC that does not belong to either the high SOC region or the low SOC region, the control unit 111 will determine the converted SOC at that time. ave The system is designated as the operational SOC (Step S112).

[0109] Steps S101 to S112 show the procedure for calculating the operational SOC in energy storage system 1A, but the procedure for calculating the operational SOC in energy storage systems 1B and 1C is the same. The management devices 110 installed in each energy storage system 1B and 1C should calculate the operational SOC of each energy storage system 1B and 1C using the same procedure as in steps S101 to S112.

[0110] The management device 110 installed in energy storage system 1A communicates with the management devices 110 of the other energy storage systems 1B and 1C to acquire the operational SOC and the individual SOC of each bank 101 in the other energy storage systems 1B and 1C.

[0111] The control unit 111 of the management device 110 installed in the energy storage system 1A determines whether or not it has received a request to display the SOC from the remote monitoring system 2 or the user terminal 3 (step S113). If it determines that it has not received a request to display the SOC (S113: NO), the control unit 111 terminates the process according to this flowchart.

[0112] If the control unit 111 determines that it has received a display request (S113: YES), it outputs screen information for the display screen (step S114). The control unit 111 then transmits the screen information for the display screen that can switch between the operational SOC and the individual SOC to the output destination device via the communication unit 113. The output destination device, either the remote monitoring system 2 or the user terminal 3, executes the display programs PG2 and PG3, respectively, to display the display screen of the operational SOC or the individual SOC on the display units 205 and 305 based on the screen information from the management device 110.

[0113] The control unit 111 determines whether or not it has received a screen switching operation from the output device (step S115). If it determines that it has not received a screen switching operation (S115: NO), the control unit 111 terminates the process according to this flowchart.

[0114] If the control unit 111 determines that it has received a screen switching operation (S115: YES), it switches the display screen to be displayed on the output device (step S116). For example, if it receives a switching operation from the operational SOC display screen to the individual SOC display screen, the control unit 111 sends the screen information for the display screen to display the individual SOC to the output device, causing the output device to display the individual SOC display screen. If it receives a switching operation from the individual SOC display screen to the operational SOC display screen, the control unit 111 sends the screen information for the display screen to display the operational SOC to the output device, causing the output device to display the operational SOC display screen.

[0115] Figure 13 is a schematic diagram showing an example of a display screen for displaying the operational SOC. When the management device 110 installed in the energy storage system 1A receives a request to display the SOC from the remote monitoring system 2, it displays the operational SOC display screen 1100, as shown in Figure 13, on the display unit 205 of the remote monitoring system 2. When the management device 110 receives a display request, it performs user authentication, and if it determines, for example, that the display request is from the administrator of the remote monitoring system 2, it generates the screen information for the display screen 1100 and transmits the generated screen information to the remote monitoring system 2. The control unit 201 of the remote monitoring system 2 displays the display screen 1100 on the display unit 205 according to the screen information received from the management device 110 via the communication unit 203. The display screen 1100 is displayed on the display unit 205 as an operation screen that can accept selection and switching operations from the administrator via the operation unit 204.

[0116] The display screen 1100 includes, for example, an equipment map display field 1101, an equipment name display field 1102, graph transition parameters 1103, a unique information display field 1104, an indicator 1105, a device selection field 1106, a unique information selection field 1107, and a status information display field 1108.

[0117] The equipment map display area 1101 schematically shows the overall structure of the equipment map, including the currently selected hierarchy. The hierarchy includes the entire equipment (first display hierarchy), individual systems (second display hierarchy), and the battery panel (third display hierarchy). In the example in Figure 13, the individual system at the second display hierarchy is selected, and the entire equipment (energy storage equipment 1) including the individual system is displayed. Each piece of equipment in the equipment map is displayed as a selectable icon. By accepting a selection operation for an icon in the equipment map display area 1101, the target equipment displayed in the unique information display area 1104 is switched.

[0118] The equipment name display field 1102 shows the name of the equipment displayed in the equipment map display field 1101. In the example in Figure 13, the entire equipment is displayed in the equipment map display field 1101, so "Entire Equipment" is displayed as the name in the text information.

[0119] The graph transition parameter 1103 is configured to accept device selection when multiple devices are available for selection at a given level. The parameter (device) is selected via a pull-down menu. For example, since the energy storage facility 1 is equipped with multiple energy storage systems 1A to 1C, the graph transition parameter 1103 can accept the selection of any one of the energy storage systems 1A to 1C. In the example in Figure 13, "System 1-LIB," which represents energy storage system 1A, is selected. When the third display level is selected, the graph transition parameter 1103 accepts the selection of the battery panel 10.

[0120] The unique information display field 1104 displays the unique information of the currently selected hierarchy. The unique information includes SOC and temperature, as described later. When the entire facility (first display hierarchy) is selected as the hierarchy and SOC is selected as the unique information, the unique information display field 1104 displays a list of the operating SOCs of each of the energy storage systems 1A to 1C included in the energy storage facility 1. When a single system (second display hierarchy) is selected as the hierarchy and SOC is selected as the unique information, the unique information display field 1104 displays the operating SOC of the single system. The example in Figure 13 shows that the operating SOC of energy storage system 1A is 94.9%, along with icons representing the 10 battery panels 10 and 1 PCS panel 11 that make up energy storage system 1A. When a battery panel (third display hierarchy) is selected as the hierarchy and SOC is selected as the unique information, the unique information display field 1104 displays the individual SOC for each bank 101 of the selected battery panel 10.

[0121] If an icon is selected in the unique information display area 1104, unique information from a lower level may be displayed. For example, in the unique information display area 1104 of Figure 13, the icon for the battery panel 10 is shown, so if this icon is selected, unique information for the battery panel 10, which is the third display level, may be displayed.

[0122] Indicator 1105 is an indicator for notifying of faults related to the voltage, temperature, current, and all other aspects of the battery panel 10 and PCS panel 11. Indicator 1105 notifies the presence or absence of a fault by changing the appearance of the icon.

[0123] The device selection field 1106 accepts the selection of either a battery or a PCS, which are the types of devices to be monitored in the energy storage system 1. If a battery is selected as the device type, the unique information display field 1104 can display information on the State of Charge (SOC), module temperature, and temperature inside the battery panel. On the other hand, if a PCS is selected as the device type, the unique information display field 1104 can display information on AC voltage, AC current, active power, and reactive power.

[0124] The unique information selection field 1107 accepts the selection of one of the displayable unique information items for the device type selected in the device selection field 1106. In the example in Figure 13, since a battery is selected in the device selection field 1106 and the SOC icon is selected, the unique information display field 1104 displays the SOC (operational SOC or individual SOC) of the currently selected hierarchy.

[0125] The status information display area 1108 displays information that should be reported to the administrator as text information. For example, the status information display area 1108 displays text information indicating that the energy storage equipment 1 is functioning normally, and if an abnormality is detected in the energy storage equipment 1, it displays text information indicating the nature of the abnormality. Some of the information that should be reported to the administrator may also be displayed in the unique information display area 1104.

[0126] Figure 14 is a schematic diagram showing an example of a display screen for displaying individual SOCs. When the management device 110 installed in the energy storage system 1A receives a request to display an SOC from the user terminal 3, it displays an individual SOC display screen 1200, as shown in Figure 14, on the display unit 305 of the user terminal 3. When the management device 110 receives a display request, it performs user authentication, and if it determines, for example, that the request is from the user (worker) of the user terminal 3, it generates screen information for the display screen 1200 and transmits the generated screen information to the user terminal 3. The control unit 301 of the user terminal 3 displays the display screen 1200 on the display unit 305 according to the screen information received from the management device 110 via the communication unit 303. The display screen 1200 is displayed on the display unit 305 as an operation screen that can accept selection and switching operations from the worker via the operation unit 304.

[0127] The display screen 1200, like the operational SOC display screen 1100, includes, for example, an equipment map display field 1201, an equipment name display field 1202, graph transition parameters 1203, a unique information display field 1204, an indicator 1205, an equipment selection field 1206, a unique information selection field 1207, and a status information display field 1208. The functions of each display component provided by the display screen 1200 are the same as those of the operational SOC display screen 1100.

[0128] The display screen 1200 presented to the operator shows the individual SOC of bank 101 installed in the battery panel 10. In the example in Figure 14, the individual SOC of bank 101 installed in "01(X)" of "System 1-LIB" (for example, bank 101 of one of the battery panels 10 adjacent to the PCS panel 11 of energy storage system 1A) is displayed.

[0129] If the tag "Energy Storage System 1" located above the equipment map display area 1201 on the display screen 1200 is selected, the system may be switched to the higher-level SOC display (i.e., the operational SOC display for energy storage systems 1A to 1C).

[0130] As described above, in this embodiment, the State of Charge (SOC) calculated from the actual battery capacity used in the energy storage equipment 1 can be presented to the administrator remotely monitoring the energy storage equipment 1 as the operational SOC, thus preventing unintended system shutdowns and other issues. On the other hand, the individual SOC for each bank 101 can be presented to the workers performing maintenance and inspections of the energy storage equipment 1, allowing them to check the status of each bank 101, identify fault locations, and effectively utilize the information.

[0131] The operational SOC displayed on the display screen 1100, etc., may be the power-based operational SOC (second operational SOC). The current-integrated value-based SOC (first operational SOC) is obtained by dividing the current-integrated value measured during charging and discharging by the discharge capacity of the bank calculated in advance by a capacity measurement test. The discharge capacity calculated by the capacity measurement test is not uniquely determined because it changes with ambient temperature and age, and therefore cannot be calculated with high accuracy. Thus, it is not possible to calculate the SOC with high accuracy when the current-integrated value is used as the basis. Furthermore, the conventional SOC is an SOC based on the current-integrated value, not an SOC calculated based on power. In addition, the relationship between the SOC and the protection value may cause the system to stop charging and discharging. Therefore, for example, if the amount of energy extracted during discharge from 100% to 50% SOC was 53kWh, it often leads to the misconception that 53kWh of energy can be extracted during discharge from 50% to 0% SOC, even though the actual amount of energy that can be extracted is less than 53kWh (for example, 47kWh). The management device 110 can display the energy-based operational SOC, thereby showing the user the actual usable energy storage capacity (charge state) of the energy storage system 1.

[0132] The disclosed embodiments are illustrative in all respects and not restrictive. The scope of the invention is defined by the claims and includes all modifications in the sense and scope equivalent to the claims. [Explanation of Symbols]

[0133] 1. Energy storage equipment 2 Remote monitoring system 3. User terminals 10 Battery Panel 11 PCS board 101 Bank 102 Bank BMU 110 Management device 111,201,301 Control Unit 112,202,302 Storage section 113,203,303 Communications Department 114,204,304 Operation section 115,205,305 Display section BT Battery Module PG1 Operation Management Program PG2, PG3 display program

Claims

1. Regarding an energy storage system configured by connecting multiple banks in parallel, each containing multiple energy storage elements connected in series, the individual SOC (State of Control) for each bank is acquired. The acquired individual SOCs are aggregated to calculate multiple aggregated SOCs. Based on the multiple aggregated SOCs calculated, the operational SOC to be used for the energy storage system is determined. The individual SOC and the operational SOC can be displayed in a switchable manner. A computer program that causes at least one computer to perform a process.

2. The system generates screen information for a display screen that can switch between the individual SOC and the operational SOC. Output the generated screen information to the output device. A computer program according to claim 1 for causing the computer to perform processing.

3. The display screen of either the individual SOC or the operational SOC selected according to the output destination device is displayed on the output destination device. When a switching operation is received by the output destination device, the system switches from one display screen to the other display screen. A computer program according to claim 2 for causing the computer to perform processing.

4. Among the individual SOCs of multiple banks installed in the energy storage system, the minimum SOC representing the lowest value, the maximum SOC representing the highest value, and the average SOC representing the average value are calculated as the aggregated SOC. In the high SOC region where the maximum SOC is equal to or greater than the first set value, the operating SOC is determined so that, as charging progresses, it approaches the maximum SOC from the average SOC. A computer program according to claim 1 for causing the computer to perform processing.

5. Among the individual SOCs of multiple banks installed in the energy storage system, the minimum SOC representing the lowest value, the maximum SOC representing the highest value, and the average SOC representing the average value are calculated as the aggregated SOC. In the low SOC region where the minimum SOC is below the second setpoint, the operating SOC is determined so that as discharge progresses, the average SOC approaches the minimum SOC. A computer program according to claim 1 for causing the computer to perform processing.

6. Among the individual SOCs of multiple banks installed in the energy storage system, the minimum SOC representing the lowest value, the maximum SOC representing the highest value, and the average SOC representing the average value are calculated as the aggregated SOC. In the intermediate SOC region where the highest SOC is less than the first set value and the lowest SOC is greater than the second set value, the operational SOC is determined to be equal to the average SOC. A computer program according to claim 1 for causing the computer to perform processing.

7. An upper limit SOC and a lower limit SOC are set in the aforementioned energy storage system. The operational SOC is determined using the converted SOC calculated based on the upper limit SOC and the lower limit SOC. A computer program according to any one of claims 1 to 6, for causing the computer to perform processing.

8. The aforementioned energy storage system is a system for storing electricity that is bought and sold in the electricity market. The computer program according to claim 1.

9. Regarding an energy storage system configured by connecting multiple banks in parallel, each containing multiple energy storage elements connected in series, the individual SOC (State of Control) for each bank is acquired. The acquired individual SOCs are aggregated to calculate multiple aggregated SOCs. Based on the multiple aggregated SOCs calculated, the operational SOC to be used for the energy storage system is determined. The individual SOC and the operational SOC can be displayed in a switchable manner. An information processing method in which processing is performed by at least one computer.

10. at least one processing unit Equipped with, The aforementioned processing unit, Regarding an energy storage system configured by connecting multiple banks in parallel, each containing multiple energy storage elements connected in series, the individual SOC (State of Control) for each bank is acquired. The acquired individual SOCs are aggregated to calculate multiple aggregated SOCs. Based on the multiple aggregated SOCs calculated, the operational SOC to be used for the energy storage system is determined. The display screen information of the display screen that switches between the individual SOC and the operational SOC is output to the output destination device. Operation management device.

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