Battery control system, power supply / demand system, battery control method, and battery control program

Abstract

To provide a battery control system, a power supply / demand system, a battery control method, and a battery control program for correcting a variation in storage batteries of a battery system.SOLUTION: Provided is a battery control system 10 applied to a battery system including a plurality of storage batteries. The battery control system 10 comprises: a sharing ratio setting unit 40 for acquiring degradation evaluation information from a storage unit 60 in which stored is degradation evaluation information composed of storage battery identification information and SOH that are associated with each other, and setting a sharing adjustment ratio by using the SOH of a plurality of storage batteries; and a power command setting unit 50 for setting the individual power command of each storage battery by using the sharing adjustment ratio. The target SOH is computed using the SOH of each storage battery constituting the battery system, and a sharing adjustment ratio for bringing the SOH of each storage battery closer to the target SOH is set for each storage battery.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a battery control system, a power supply and demand system, a battery control method, and a battery control program. [Background technology]

[0002] In order to grasp the state of a storage battery, there is known a technique for measuring SOC (State Of Charge, charging state, charging rate) and SOH (State Of Health, deterioration state, deterioration evaluation value). For example, Patent Document 1 discloses a method for calculating the state of charge of a storage battery, which obtains a linear approximation of the current-voltage characteristics of the storage battery from the storage battery current and storage battery voltage, and estimates the state of charge and / or the state of deterioration of the storage battery using the slope and intercept of the equation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-345135 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the invention of Patent Document 1, although the storage battery characteristics (storage battery performance level, SOH) are estimated and the life of the storage battery is determined, no consideration has been given to the operation of a battery system when there is variation in the storage battery characteristics of multiple storage batteries. When there is variation in the storage battery characteristics of multiple storage batteries included in a battery system, it is difficult to extend the life of the entire battery system.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a battery control system, a power supply and demand system, a battery control method, and a battery control program that can even out the variations in the storage batteries of a battery system. [Means for solving the problem]

[0006] In order to solve the above problems, the battery control system, power supply and demand system, battery control method, and battery control program disclosed herein employ the following means. The battery control system disclosed herein is a battery control system applied to a battery system having a plurality of storage batteries, and includes a sharing adjustment rate setting unit that acquires deterioration evaluation information from a memory unit in which deterioration evaluation information associated with identification information and SOH of the storage batteries is stored, and sets a sharing adjustment rate using the SOH of the plurality of storage batteries, and a power command setting unit that sets individual power commands for each of the storage batteries using the sharing adjustment rate, calculates a target SOH using the SOH of each of the storage batteries that constitute the battery system, and sets the sharing adjustment rate for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH.

[0007] The power supply and demand system of the present disclosure includes a battery system including a plurality of storage batteries, and the battery control system described above.

[0008] The battery control method disclosed herein is a battery control method applied to a battery system having a plurality of storage batteries, and includes a sharing adjustment rate setting process for acquiring deterioration evaluation information from a memory unit in which deterioration evaluation information associated with identification information and SOH of the storage batteries is stored, and setting a sharing adjustment rate using the SOH of the plurality of storage batteries, and a power command setting process for setting individual power commands for each of the storage batteries using the sharing adjustment rate, in which a computer executes a process of calculating a target SOH using the SOH of each of the storage batteries that constitute the battery system, and setting the sharing adjustment rate for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH.

[0009] A battery control program according to the present disclosure causes a computer to execute the above-described battery control method. Effect of the Invention

[0010] According to the present disclosure, the sharing adjustment rate of each storage battery is set based on the SOH, which is a deterioration evaluation value, so that power sharing can be appropriately performed to extend the life of the entire battery system, taking into account the SOH variation between each storage battery. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram illustrating a schematic configuration of an electricity supply and demand system according to some embodiments of the present disclosure. [Diagram 2] FIG. 1 is a diagram illustrating an example of a hardware configuration of a battery control system according to some embodiments of the present disclosure. [Diagram 3] FIG. 2 is a functional configuration diagram showing an example of functions of a battery control system according to some embodiments of the present disclosure. [Figure 4] 1 is a functional configuration diagram showing an example of functions of a degradation state assessment unit in some embodiments of the present disclosure. FIG. [Diagram 5] FIG. 13 is a diagram illustrating a case where the sharing rate of a storage battery according to some embodiments of the present disclosure is defined in the range from 0 to 1. [Figure 6] FIG. 13 is a diagram showing an example of a sharing adjustment rate of a storage battery. [Figure 7] FIG. 6 is a diagram showing examples of individual power commands when the sharing adjustment rate is set to 0.8 and 1.2 for comparison. [Figure 8] FIG. 6 is a diagram showing, for comparison, examples of charge and discharge currents when the sharing adjustment ratios are set to 0.8 and 1.2, respectively. [Figure 9] FIG. 6 shows an example of SOC when the sharing adjustment rate is set to 0.8 and 1.2 for comparison. [Figure 10] 1 is a flowchart showing an example of a procedure of a degradation state evaluation process executed by a battery control system according to some embodiments of the present disclosure. [Figure 11] 10 is a flowchart showing an example of a procedure of an individual power command setting process executed by a battery control system according to some embodiments of the present disclosure. [Figure 12] 1 is a diagram for explaining the effect of a battery control system according to some embodiments of the present disclosure. [Figure 13] 1 is a diagram illustrating a schematic configuration of an electricity supply and demand system according to some embodiments of the present disclosure. [Figure 14] FIG. 2 is a functional configuration diagram showing an example of functions of a battery control system according to some embodiments of the present disclosure. [Figure 15] FIG. 2 illustrates a relationship between individual power commands and a bus voltage of a DC link according to some embodiments of the present disclosure. [Figure 16] 11 is a diagram showing an example of the relationship between the slope of storage batteries with different SOH and individual power commands. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [First embodiment] Hereinafter, a power supply and demand system, a battery control system, a battery control method, and a program according to a first embodiment of the present disclosure will be described with reference to the drawings. 1 is a diagram showing a schematic configuration of an electricity supply and demand system 100 according to some embodiments of the present disclosure. As shown in FIG 1, the electricity supply and demand system 100 includes a battery system (ESS: Energy Storage System) 1 and a battery control system 10.

[0013] The battery system 1 is connected to a power grid 2 via a substation 3, and supplies and demands electric power to and from the power grid 2. The substation 3 and the battery system 1 are connected by an AC link 4. The battery system 1 includes a plurality of storage batteries 5 (5a to 5d). FIG. 1 illustrates an example in which four storage batteries 5 are included, but the number of storage batteries 5 is not limited. Hereinafter, when it is necessary to distinguish between the storage batteries 5a, 5b, etc., they will be referred to as storage batteries 5a, 5b, and when it is not necessary to distinguish between them, they will be simply referred to as storage batteries 5. Other configurations will be treated in the same manner.

[0014] Each storage battery 5 is chargeable and dischargeable, and is configured, for example, as a battery string in which a plurality of unit batteries (cells) are connected in series. Alternatively, a configuration in which a plurality of battery strings are connected in parallel may be used. Also, each storage battery 5 may include a measurement unit (not shown) that measures various data (battery information) such as voltage value, current value, and temperature, and a battery management unit (BMU: Battery Management Unit) (not shown) that monitors the state of the storage battery 5 based on the measurement data. The configuration of the storage battery 5 may be any known technology and is not particularly limited.

[0015] Each storage battery 5 is connected to the AC link 4 via a power converter 7 (7a to 7d). The power converter 7 is, for example, an AC / DC converter. The power converter 7 controls the charging and discharging of the storage battery 5 by, for example, being driven based on an individual power command given from the battery control system 10. Specifically, the power converter 7a controls the charging and discharging of the storage battery 5a, the power converter 7b controls the charging and discharging of the storage battery 5b, the power converter 7c controls the charging and discharging of the storage battery 5c, and the power converter 7d controls the charging and discharging of the storage battery 5d. During charging, the power converter 7 converts AC power from the power system 2 into DC power and outputs it to the storage battery 5, and during discharging, the power converter 7 converts DC power from the storage battery 5 into AC power and supplies it to the power system 2.

[0016] The battery control system 10 is a control system that controls the battery system 1. The battery control system 10 is connected to the battery system 1 via, for example, a communication network, and is configured to be able to send and receive information. The battery control system 10 may be a cloud server, or may be a local system installed at the location where the battery system 1 is installed. The battery control system 10 is also connected to a grid monitoring system 6 via a communication network. The grid monitoring system 6 is, for example, a central power supply command center of a power company or a higher-level energy management system (EMS), and determines a system power request to be made to the battery system 1 and transmits this to the battery control system 10.

[0017] Next, the battery control system 10 according to this embodiment will be described. Fig. 2 is a diagram showing an example of a hardware configuration of a battery control system 10 according to some embodiments of the present disclosure. As shown in Fig. 2, the battery control system 10 is a computer and includes, for example, a CPU (Central Processing Unit: processor) 11, a main memory (Main Memory) 12, a secondary storage (Secondary Storage: memory) 13, a communication interface 14, and the like. The battery control system 10 may also include an input device 15 that accepts input from a user, a display 16, and the like. These components are connected via a bus 18.

[0018] The main memory device 12 is composed of writable memory such as a cache memory or a RAM (Random Access Memory), and is used as a working area for reading out the execution program of the CPU 11, writing processing data by the execution program, and the like. The secondary storage device 13 is a non-transitory computer readable storage medium. Examples of the secondary storage device 13 include a magnetic disk such as a hard disk drive (HDD), a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory such as a solid state drive (SSD), and the like.

[0019] 3 is a functional configuration diagram showing an example of functions of a battery control system 10 according to some embodiments of the present disclosure. With the battery system 1 connected to the power grid 2, the battery control system 10 evaluates the degradation state of each storage battery 5, and controls charging and discharging of each storage battery 5 using the evaluation result of the degradation state. Specifically, as illustrated in FIG. 3, the battery control system 10 includes a degradation state evaluation unit 20, a data management unit 30, a sharing adjustment rate setting unit 40, a power command setting unit 50, and a storage unit 60.

[0020] A series of processes for realizing various functions described below is stored in the secondary storage device 13 (see FIG. 2) in the form of a program (e.g., a battery control program), for example, and the CPU 11 reads this program into the main storage device 12 and executes information processing and arithmetic processing to realize various functions. Note that the program may be pre-installed in the secondary storage device 13, provided in a state stored in another computer-readable storage medium, or distributed via wired or wireless communication means. Examples of computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

[0021] The degradation state evaluation unit 20 performs degradation state evaluation to evaluate the degradation state of the storage battery 5. The degradation state evaluation is performed in a state where the storage battery 5 is connected to the power grid 2. The degradation state evaluation is started when a preset start condition is satisfied. Examples of the start condition include when a predetermined period has passed since the previous degradation state evaluation, when the cumulative operating time since the previous degradation state evaluation reaches a predetermined time, when a command to start the degradation state evaluation is input by a user, and the like. The start condition may be set as a combination of these. Also, the cycle of the degradation state evaluation may be set to be shorter as the degradation evaluation value decreases.

[0022] 4 is a functional configuration diagram showing an example of functions of the degradation state evaluation unit 20 in some embodiments of the present disclosure. As shown in FIG. 4, the degradation state evaluation unit 20 includes, for example, a selection unit 21, a measurement execution unit 22, a restoration control unit 23, and an evaluation value calculation unit 24. When evaluating the degraded state, the selection unit 21 selects, in order, the storage batteries 5 to be evaluated. Specifically, the selection unit 21 selects one or more storage batteries 5 to be evaluated according to a predetermined algorithm during degradation state evaluation. Then, when the measurement execution unit 22 described later finishes the degradation state evaluation of the storage battery 5 selected as the evaluation target, the selection unit 21 selects one or more storage batteries 5 to be evaluated next as the evaluation target. The selection unit 21 repeats the selection until all the storage batteries 5a to 5d included in the battery system 1 are selected as evaluation targets. Note that, for convenience of explanation, in this embodiment, a case where the selection is performed in order of the storage batteries 5a, 5b, 5c, and 5d will be described as an example.

[0023] The measurement execution unit 22 controls the charging and discharging of the storage battery 5 to be evaluated according to a preset charging and discharging pattern, and acquires the voltage value or current value at this time. Specifically, the measurement execution unit 22 issues a charging and discharging command according to a predetermined charging and discharging pattern to the power conversion device 7 corresponding to the storage battery 5 to be evaluated. As a result, the power conversion device 7 is driven according to the charging and discharging pattern, thereby realizing charging and discharging according to the charging and discharging pattern.

[0024] After the measurement by the measurement execution unit 22 is completed, in other words, after the charge / discharge control based on a predetermined charge / discharge pattern is completed, the recovery control unit 23 controls the charge / discharge of the storage battery to be evaluated (e.g., 5a) so that the charge state of the storage battery to be evaluated approaches the charge state of the operational storage batteries (e.g., 5b-5d). Then, when the charge state of the storage battery to be evaluated (e.g., 5a) and the charge state of the operational storage batteries (e.g., 5b-5d) satisfy a predetermined condition, the recovery control unit 23 recovers the storage battery to be evaluated as an operational storage battery. For example, the recovery control unit 23 may recover the storage battery to be evaluated as an operational battery when the difference between the average cell voltage of the storage battery to be evaluated and the average value of the average cell voltage of the operational storage batteries falls within a predetermined range. Also, the charging rate may be used instead of the average cell voltage.

[0025] The evaluation value calculation unit 24 calculates a degradation evaluation value for evaluating the degradation state of the storage battery 5 to be evaluated, based on the current value or voltage value when charge / discharge control is performed by the measurement execution unit 22. For example, the evaluation value calculation unit 24 receives battery information (current value, voltage value, temperature, etc.) from the storage battery 5 to be evaluated, and calculates a degradation evaluation value based on the received battery information.

[0026] The degradation evaluation value is, for example, an evaluation value that means a decrease in the current full charge capacity relative to the initial full charge capacity of the storage battery 5, and an example thereof is SOH (State of Health). The evaluation value calculation unit 24 calculates the latest full charge capacity (Ah) by integrating the current value when the storage battery 5 to be evaluated is changed from a fully charged state to a lower limit charge state, or from the lower limit charge state to a fully charged state. Then, the evaluation value calculation unit 24 calculates the SOH by dividing the latest full charge capacity by the full charge capacity at the start (initial) of operation of the battery system 1. Note that the method of evaluating the degradation state of the battery is not limited to the above example. For example, it is possible to appropriately adopt a known technology for evaluating the degradation state of the battery.

[0027] After calculating the deterioration evaluation values ​​for all the storage batteries 5a-5d, the evaluation value calculation unit 24 outputs deterioration evaluation information that associates the identification information of each storage battery with the deterioration evaluation value to the data management unit (see FIG. 3). The deterioration evaluation information may include time information, battery information of each storage battery 5a-5d acquired by the measurement execution unit 22, and the like.

[0028] The data management unit 30 (see FIG. 3 ), for example, stores the degradation assessment information acquired from the degradation state assessment unit 20 in the storage unit 60. The data management unit 30 also stores in the storage unit 60 the sharing adjustment rates of the storage batteries 5a to 5d calculated by the sharing adjustment rate setting unit 40, which will be described later, and the like.

[0029] The sharing adjustment rate setting unit 40 sets a sharing adjustment rate for each of the storage batteries 5a-5d based on the deterioration evaluation value (SOH) of each of the storage batteries 5a-5d stored in the memory unit 60. For example, the sharing adjustment rate setting unit 40 calculates a target deterioration evaluation value using the deterioration evaluation values ​​of the storage batteries 5a-5d constituting the battery system 1, and sets a sharing adjustment rate for each storage battery that brings the deterioration evaluation value of each of the storage batteries 5a-5d closer to the target deterioration evaluation value. The target deterioration evaluation value is, for example, an average value of the deterioration evaluation values ​​of the storage batteries 5a-5d.

[0030] As a result, a larger sharing adjustment rate is set for a battery 5 with a high degradation evaluation value (e.g., a high SOH) compared to a battery 5 with a low degradation evaluation value. A battery 5 with a high sharing adjustment rate is allocated a larger portion of the required power relative to the system required power compared to a battery 5 with a low sharing adjustment rate. That is, when charging, a battery 5 with a high sharing adjustment rate charges more power than a battery 5 with a low sharing adjustment rate, and when discharging, a battery 5 with a high sharing adjustment rate discharges more power than a battery 5 with a low sharing adjustment rate.

[0031] For example, the sharing adjustment rate setting unit 40 calculates the sharing adjustment rate α(i) using a target deterioration evaluation value SOHave, which is the average value of the SOH of the storage batteries 5a to 5d, and each deviation ΔSOH(i) between the target deterioration evaluation value SOHave and the SOH(i) of each storage battery 5. As an example, the sharing adjustment rate α(i) is calculated by the following formula (1).

[0032] Sharing adjustment rate α(i)={1+K(ΔSOH(i) / SOHave)} (1)

[0033] In the above formula (1), i indicates identification information of the storage batteries 5a to 5d (for example, i=1 to 4), and for example, the sharing adjustment rate α(1) of the storage battery 5a is expressed by the following formula.

[0034] Sharing adjustment rate α(1)={1+K(ΔSOH(1) / SOHave)}

[0035] In the above formula (1), K is an adjustment gain, and the larger the adjustment gain K is, the shorter the time until the variation in the degradation evaluation value falls within a predetermined range can be. The adjustment gain K is a value equal to or greater than zero. The adjustment gain K is a value that can be changed as appropriate.

[0036] When the adjustment gain K is set to zero, the sharing adjustment rate of each of the storage batteries 5a to 5d is 1, so in this case, there is no increase or decrease in the power sharing according to SOH(i). That is, the system required power is allocated equally to each storage battery.

[0037] Furthermore, in the above formula (1), if the SOH(i) of each storage battery 5 is equal to the target degradation evaluation value SOHave, the deviation ΔSOH(i) between the target degradation evaluation value SOHave and the SOH(i) of each storage battery 5 becomes zero, and the sharing adjustment rate of each storage battery 5a to 5d becomes 1. In this case, there is no increase or decrease in the power sharing according to SOH(i). That is, the system required power is allocated evenly to each storage battery.

[0038] When the adjustment gain K is set to 1, the sharing adjustment rate α(i) of each of the storage batteries 5a to 5d is expressed by the following formula.

[0039] Sharing adjustment rate α(i)={1+(ΔSOH(i) / SOHave)}

[0040] If the target deterioration evaluation value SOHave is 50(%) and SOH(1) for i=1 is also 50(%), then ΔSOH(1)=50-50=0(%), and therefore the sharing adjustment rate α(1) is expressed by the following formula.

[0041] Sharing adjustment rate α(1)={1+(ΔSOH(1) / SOHave)}=1

[0042] In this case, if SOHave is 50(%) and SOH(2) for i=2 is 100(%) (twice that for i=1), then ΔSOH(2) = 100-50 = 50(%), and therefore the sharing adjustment rate α(2) is expressed by the following formula.

[0043] Sharing adjustment rate α(2)={1+(ΔSOH(2) / SOHave)}=2

[0044] That is, for a storage battery 5 with twice the SOH of the reference storage battery 5, the sharing adjustment rate α is doubled and the charge / discharge amount during charging / discharging is also doubled. When selected in this way, it becomes possible to operate the storage batteries so that their SOC (charging rate) behavior is almost the same.

[0045] The sharing adjustment rate setting unit 40 calculates the sharing adjustment rate α(i) and updates each sharing adjustment rate α(i) in the storage unit 60, for example, when a preset calculation start condition is satisfied. Here, the predetermined calculation start condition may be, for example, when the degradation state evaluation unit 20 performs a degradation state evaluation to calculate degradation evaluation values ​​for all the storage batteries 5a-5d, and degradation evaluation information including the degradation evaluation values ​​of the storage batteries 5a-5d is stored in the storage unit 60. Furthermore, the sharing adjustment rate setting unit 40 may update the sharing adjustment rate α(i) when the operation mode of the battery system 1 changes, for example, when a storage battery 5 is suspended.

[0046] After calculating the sharing adjustment rate for each of the storage batteries 5a to 5d, the sharing adjustment rate setting unit 40 outputs sharing adjustment rate information that associates the identification information of each storage battery with the sharing adjustment rate to the data management unit 30 (see FIG. 3). The sharing adjustment rate information may include time information and the like.

[0047] In formula (1), the sharing adjustment factor is defined as "1" when the number of storage batteries 5 is 1. For example, when the number of storage batteries 5 is 4, the total sharing adjustment factor is 4. On the other hand, when the sharing adjustment rate for each storage battery 5 is defined as a value between 0 and 1, it is calculated as follows. FIG. 5 is a diagram illustrating a case where the sharing adjustment rate of the storage battery is defined in the range from 0 to 1 according to some embodiments of the present disclosure. 5, the sharing adjustment rate X(i) (i is an integer equal to or greater than 1, i=1, . . . , N) of the storage battery 5 is calculated from the total number N of the storage batteries 5 (N is an integer equal to or greater than 2) and the SOH value of each storage battery 5. The sharing adjustment rate X(i) of the storage battery 5 is adjusted by an adjustment gain K.

[0048] When K is zero, each share adjustment rate X(i) is 1 / N, which is the same value. Therefore, there is no increase or decrease in power share, and the system required power is allocated equally to each storage battery.

[0049] When K is 1, the sharing adjustment rate X(i) is power sharing in accordance with the SOH capacity of each storage battery 5, and the amplitude (range of change) of the SOC of each storage battery 5 becomes uniform.

[0050] When K exceeds 1, the sharing adjustment rate X(i) is set so that the larger the SOH capacity of the storage battery 5, the more power sharing is performed. A large load is applied to the storage battery 5 with a large SOH capacity, while a small load is applied to the storage battery 5 with a small SOH capacity. Therefore, the amplitude (range of change) of the SOC of each storage battery 5 is not uniform, and an SOC imbalance occurs.

[0051] The power command setting unit 50 calculates an individual power command Pdiv(i) for each operational storage battery by using the sharing adjustment rate α(i) corresponding to each storage battery 5a to 5d and the system required power Pall acquired from the grid monitoring system 6. Here, the operational storage battery is an operational storage battery 5, in other words, a storage battery 5 capable of being controlled for charging and discharging in response to the system required power Pall. That is, the storage battery 5 for which deterioration evaluation is performed by the above-mentioned deterioration state evaluation unit 20 is excluded from the operational storage batteries.

[0052] The power command setting unit 50 acquires the sharing adjustment rate α(i) of each operational storage battery stored in the memory unit 60, and calculates individual power commands for each operational storage battery by using the acquired sharing adjustment rate α(i) and the system required power Pall in the following equation (2).

[0053] Pdiv(i)=Pall×(1 / N)×α(i) (2)

[0054] In the above formula (2), N indicates the number of operational batteries. For example, when the degradation state evaluation unit 20 described above has not performed a degradation state evaluation, the batteries 5a to 5d can be operational batteries, and during a period when a degradation state evaluation is being performed, a battery 5 other than the one being evaluated can be an operational battery.

[0055] As can be seen from formula (2), a larger individual power command is set for an operational storage battery with a high degradation evaluation value (high health) than for an operational storage battery with a low degradation evaluation value. After allocating an individual power command Pdiv(i) to each operational storage battery, the power command setting unit 50 transmits the individual power command Pdiv(i) to the power conversion device 7 corresponding to each operational storage battery. As a result, charging and discharging control according to the individual power command Pdiv is performed in each operational storage battery.

[0056] The sum of the sharing adjustment rates α(i) of the operating batteries is expressed by the following equation (3).

[0057] Σα(i)=Σ{1+K(ΔSOH(i) / SOHave)}=Σ1=N (3)

[0058] The sum of the individual power commands Pdiv(i) for each operating battery is expressed by the following equation (4).

[0059] ΣPdiv(i)=ΣPall×(1 / N)×α(i)=Pall / N×Σα(i) (4)

[0060] Therefore, the sum of the individual power commands Pdiv(i) for each operating battery is expressed by the following equation (5) based on equations (3) and (4).

[0061] ΣPdiv(i)=Pall / N×N=Pall (5)

[0062] Therefore, except in cases where charging / discharging cannot be performed according to the individual power command Pdiv(i) due to limitations in the power converter, the sum of the individual power commands Pdiv(i) for each operating storage battery is determined to match the system required power Pall.

[0063] For example, the SOH(2) of the storage battery 5b is higher than the SOH(1) of the storage battery 5a, that is, SOH(1) < SOH(2). As shown in FIG. 6, when the sharing adjustment rate α(1) of the storage battery 5a is set to 0.8 and the sharing adjustment rate α(2) of the storage battery 5b is set to 1.2, an example of the individual power command, charge and discharge current, and SOC is compared and shown in FIGS. 7 to 9 respectively. In FIGS. 7 to 9, the solid line indicates the storage battery 5a, and the dashed line indicates the storage battery 5b. As shown in FIGS. 7 to 9, since the individual power command of the storage battery 5b is larger than that of the storage battery 5a, the charge and discharge current of the storage battery 5b becomes larger than that of the storage battery 5a, and the amplitude of the SOC also becomes a larger value than that of the storage battery 5a.

[0064] Next, the operation of the battery control system 10 according to the present embodiment will be described. FIG. 10 is a flowchart showing an example of the procedure of the deterioration state evaluation process executed by the battery control system 10 according to some embodiments of the present disclosure. The deterioration state evaluation process shown below is started when the preset start condition of the deterioration state evaluation is satisfied. Hereinafter, for convenience of explanation, a case where the deterioration state evaluation is performed in the order of the storage batteries 5a, 5b, 5c, and 5d will be exemplified and described.

[0065] First, the battery control system 10 selects the storage battery 5a to be evaluated for the deterioration state evaluation (SA1), performs charge and discharge control on the selected storage battery 5a according to a preset charge and discharge pattern, and obtains battery information such as the voltage value, current value, and temperature of the storage battery 5a at this time from the battery system 1 (SA2).

[0066] When the charge / discharge control of the storage battery 5a to be evaluated is completed, a deterioration evaluation value is calculated from the acquired battery information (SA3), and the identification information "#1" of the storage battery 5a to be evaluated and the deterioration evaluation value are associated and stored in an internal memory (SA4). Next, a recovery process is performed (SA5). In the recovery process, the charge / discharge of the storage battery 5a to be evaluated is controlled so that the charging rate of the storage battery 5a to be evaluated approaches the charging rates of the operational batteries 5b to 5d. Then, when the charging rate of the storage battery 5a to be evaluated satisfies a predetermined condition defined in relation to the charging rates of the operational batteries, the storage battery 5a to be evaluated is recovered as an operational battery.

[0067] Next, it is determined whether all the storage batteries 5a to 5d have been selected as the evaluation target (SA6). In this case, since all the storage batteries 5a to 5d have not been selected (SA6: NO), the process returns to step SA1, and the unselected storage battery 5b is selected as the evaluation target. Then, a degradation state evaluation is performed for the storage battery 5b. Here, if the storage battery 5b is selected as the evaluation target, the operation storage batteries are the storage batteries 5a, 5c, and 5d. Then, the same process is performed for the storage batteries 5c and 5d. If it is determined in step SA6 that all the storage batteries 5a to 5d have been selected as the evaluation target (SA6: YES), degradation evaluation information that associates the identification information #1 to #4 of each of the storage batteries 5a to 5d with the degradation evaluation value is output (SA7), and the process ends. As a result, the degradation evaluation value of each of the storage batteries 5a to 5d is stored in the storage unit 60.

[0068] In this way, when the deterioration evaluation value is updated and, for example, a condition for starting calculation of the sharing adjustment rate is satisfied, the battery control system 10 executes a sharing adjustment rate setting process, for example. In the sharing adjustment rate setting process, a sharing adjustment rate is calculated based on the latest deterioration evaluation value of each storage battery. The calculated sharing adjustment rate is associated with the identification information of each storage battery 5a-5d and stored in the storage unit 60. As a result, the latest sharing adjustment rate of each storage battery 5a-5d is stored in the storage unit 60, and the sharing adjustment rate is updated.

[0069] Next, an individual power command setting process executed by the battery control system 10 will be described with reference to Fig. 11. Fig. 11 is a flowchart showing an example of the procedure of the individual power command setting process executed by the battery control system according to some embodiments of the present disclosure. This process starts when the operation of the battery system 1 is started and ends when it is ended.

[0070] First, the battery control system 10 acquires the sharing adjustment rate α(i) of each of the storage batteries 5a-5d from the storage unit 60 (SB1). Next, it is determined whether or not a degradation state is being evaluated (SB2). As a result, if a degradation state is being evaluated (SB2: YES), the battery control system 10 identifies operational batteries excluding the storage battery 5 to be evaluated (SB3). For example, if the storage battery 5a is selected as the storage battery 5 to be evaluated, the storage batteries 5b-5d are set as operational batteries. On the other hand, if a degradation state is not being evaluated (SB2: NO), the storage batteries 5a-5d are identified as operational batteries.

[0071] Next, for each operational battery, an individual power command is set using the sharing adjustment rate α(i) (SB4), and each individual power command is sent to each operational battery (SB5). This makes it possible to perform charge / discharge control that reflects the degradation evaluation value (e.g., SOH(i)) of each operational battery. Next, it is determined whether or not the control of the battery system 1 has been completed (SB6), and if not (SB6: NO), the process returns to step SB2 and repeats the subsequent processes. On the other hand, if the control has been completed (SB6: YES), this process ends.

[0072] As described above, the battery control system 10 according to this embodiment includes a degradation state evaluation unit 20 that sequentially selects storage batteries 5 to be evaluated for their degradation state, and calculates a degradation evaluation value relating to the degradation state of the storage battery 5 to be evaluated using a voltage value or a current value when charging and discharging the storage battery 5 to be evaluated is controlled according to a preset charge and discharge pattern, and a data management unit 30 that associates identification information of the storage battery 5 with the degradation evaluation value and stores them in the storage unit 60. As a result, the degradation evaluation values ​​of the storage batteries 5a to 5d are stored in the storage unit 60, and the degradation evaluation value in the storage unit 60 is updated every time a degradation state evaluation is performed.

[0073] Furthermore, according to this embodiment, the battery control system 10 includes a sharing adjustment rate setting unit 40 that sets a sharing adjustment rate α(i) using the deterioration evaluation values ​​of the multiple storage batteries 5a to 5d stored in the memory unit 60, and a power command setting unit 50 that sets individual power commands for each operational storage battery using the sharing adjustment rate α(i). This makes it possible to operate the operational batteries 5 other than the batteries being evaluated while performing the degradation state evaluation. In this case, the operational batteries are controlled based on individual power commands set using the sharing adjustment rate α(i) calculated based on the respective degradation evaluation values. This makes it possible to suppress the variation in degradation evaluation value (SOH) between the batteries 5, and to extend the life of the battery system 1 as a whole.

[0074] FIG. 12 is a diagram for explaining the effect of the battery control system according to some embodiments of the present disclosure. FIG. 12 shows an example of the battery life when the battery control system 10 according to the present embodiment is applied and when it is not applied, so that it can be compared. As shown in FIG. 12, in the case of no control, the same individual power command is given to the storage battery 5 regardless of the SOH, so that the storage battery 5 with a low SOH in the initial state will reach the end of its life first. On the other hand, when the battery control system 10 according to the present embodiment is applied, more individual power commands are given to the storage battery 5 with a high SOH, and relatively fewer individual power commands are given to the storage battery 5 with a low SOH. This makes it possible to gradually reduce the variation in SOH of each storage battery 5. This makes it possible to extend the life of the storage battery 5 with a low SOH in the initial state, so that it is possible to extend the life of the battery system 1 as a whole, as shown in FIG. 12.

[0075] Second Embodiment Next, a power supply and demand system, a battery control system, a battery control method, and a program according to a second embodiment of the present disclosure will be described with reference to the drawings. In the power supply and demand system 100 according to the first embodiment described above, the power conversion device 7 is an AC / DC converter, and the battery system 1 is connected to the AC link 4 via this power conversion device 7. In contrast, as shown in FIG. 13, the power supply and demand system 100a according to this embodiment includes a power conversion device 7' (7a' to 7d) which is a DC / DC converter. The battery system 1a is connected to a DC link 8 via a power supply 11'. The DC link 8 and the substation 3 are connected to each other via an AC / DC converter 9.

[0076] Fig. 14 is a functional configuration diagram showing an example of functions of a battery control system 10a according to some embodiments of the present disclosure. As shown in Fig. 14, in this embodiment, the functions of a sharing adjustment rate setting unit 40a and a power command setting unit 50a are different from those of the first embodiment described above. Hereinafter, the same reference numerals are used to designate configurations common to the first embodiment, and descriptions thereof are omitted, and different configurations are mainly described.

[0077] When the battery system 1a is connected to the DC link 8, it is necessary to control the charging and discharging of the battery system 1 so that the bus voltage of the DC link 8 falls within a voltage range required by the power grid. For example, if the voltage of the DC link 8 rises due to the supply of power from the power system 2, the battery system 1a is charged with power corresponding to the voltage increase, thereby suppressing the voltage rise of the DC link 8. Conversely, if the voltage of the DC link 8 drops due to the supply of power to the power system 2, the battery system 1a is discharged with power corresponding to the voltage drop, thereby suppressing the voltage drop of the DC link 8.

[0078] Fig. 15 is a diagram showing the relationship between an individual power command and the bus voltage of the DC link 8 according to some embodiments of the present disclosure. In Fig. 15, the horizontal axis represents power, the vertical axis represents the differential voltage between the target voltage of the DC link 8 and the operating voltage of the DC link 8, and the relationship between the differential voltage and the individual power command is indicated by a solid line. In FIG. 15, +Vm_max is, for example, the maximum allowable voltage for the target voltage of the DC link 8, and -Vm_max is, for example, the minimum allowable voltage for the target voltage of the DC link 8. In other words, Vm_max and -Vm_max respectively indicate the upper limit and lower limit of the allowable voltage range for the target voltage of the DC link 8. Here, the maximum allowable voltage and the minimum allowable voltage are merely examples and are not limited thereto. That is, they may be set appropriately depending on the operation of the battery system 1 and the like. Also, in FIG. 15, -Pmax indicates the upper limit charge power of the power conversion device 7' and +Pmax indicates the upper limit discharge power of the power conversion device 7' as examples, but are not limited thereto. That is, they may be set appropriately depending on the operation of the battery system 1 and the like. From FIG. 15, the relationship between the individual power command Pdiv and the differential voltage Vp is expressed by the following equation (6).

[0079] Vp = -a × Pdiv (6) where a=Vmax / Pmax

[0080] When the above equation (6) is converted into a derivation equation for Pdiv, the following equation (7) is obtained. Pdiv=-Vp / a (7)

[0081] As shown in FIG. 15, when the current differential voltage Vp=+ΔV1, the individual power command Pdiv is P1 (charging), and when the current differential voltage Vp=-ΔV2, the individual power command Pdiv is P2 (discharging). 15, it can be seen that the individual power command Pdiv is set to a larger value as the operating voltage of DC link 8 deviates from the target voltage. It can also be seen that when the slope a is increased, the individual power command decreases, and when the slope a is decreased, the individual power command increases. Therefore, in this embodiment, the slope a is changed according to the deterioration evaluation value, more specifically, the sharing adjustment rate α(i) calculated in the first embodiment, thereby performing charge / discharge control of each storage value according to the deterioration evaluation value.

[0082] In this embodiment, the sharing adjustment rate setting unit 40a calculates the slope a(i) by using the sharing adjustment rate α(i) of each storage battery in the following equation (8).

[0083] a(i)=a×{1 / α(i)} (8)

[0084] In equation (5), a(i) is the slope of the storage battery 5 with identification information i, a is the default slope (a=Vmax / Pmax), and α(i) is the sharing adjustment rate of the storage battery 5 with identification information i, and is calculated using equation (2) above. As can be seen from equation (5), a smaller slope is set for an operating storage battery with a high degradation evaluation value (high health) than for an operating storage battery with a low degradation evaluation value.

[0085] After calculating the slope a(i) for each storage battery, the sharing adjustment rate setting unit 40a outputs slope information that associates the identification information of each storage battery with the slope to the data management unit 30. Time information, etc. may be added to the slope information.

[0086] The power command setting unit 50a calculates an individual power command Pdiv(i) for each operational battery using the gradient a(i) corresponding to each battery and the operating voltage (actually measured voltage) of the DC link 8. For the operating voltage of the DC link 8, it is possible to use information notified from the battery system 1, more specifically, the power conversion device 7′, for example. Specifically, the power command setting unit 50a acquires the slope a(i) of each storage battery stored in the memory unit 60, and calculates the individual power command Pdiv(i) of each storage battery by using the acquired sharing adjustment rate α(i) and the differential voltage Vp between the operating voltage of the DC link 8 and the target voltage in the following equation (9).

[0087] Pdiv(i)=-Vp / a(i) (9)

[0088] When the power command setting unit 50a assigns the individual power command Pdiv(i) to each operational storage battery, the power command setting unit 50a transmits the individual power command Pdiv(i) to the power conversion device 7' corresponding to each operational storage battery. As a result, in each operational storage battery, charging and discharging control according to the individual power command Pdiv(i) is performed.

[0089] For example, an example of the slope and individual power commands when the SOH(2) of battery 5b is higher than the SOH(1) of battery 5a is shown in comparison in Fig. 16. As shown in Fig. 16, the individual power commands Pc(2), Pd(2) of battery 5b are greater than the individual power commands Pc(1), Pd(1) of battery 5a, so the charge / discharge current of battery 5b is greater than that of battery 5a, and the amplitude of the SOC is also greater than that of battery 5a.

[0090] In this way, when the battery system 1 is connected to the DC link 8, it is possible to set an individual power command for each storage battery based on the SOH using the slope information.

[0091] Third Embodiment Next, a power supply and demand system, a battery control system, a battery control method, and a program according to a third embodiment of the present disclosure will be described with reference to the drawings. In the power supply and demand system 100 according to the second embodiment described above, the sharing adjustment rate is calculated based on the SOH, but the power supply and demand system 100 according to this embodiment differs from the second embodiment described above in that the sharing adjustment rate is calculated by predicting the influence of the ambient temperature, and is otherwise similar to the second embodiment. Here, the differences from the second embodiment will be mainly described, and the same explanation as the second embodiment will be omitted. The same parts as those in the second embodiment are designated by the same reference numerals.

[0092] In calculating the sharing adjustment rate, the sharing adjustment rate setting unit 40 predicts SOH[i](t+Δt), which is the predicted value of SOH after Δt (SOH predicted value), based on the SOH[i](t) measured from the storage battery 5[i] at time t, the storage battery current I[i](t) and the charging rate SOC[i](t) during the operation period of the storage battery 5[i], and the ambient temperature T[i](t).

[0093] The sharing adjustment rate setting unit 40 sets a target SOH predicted value at time (t+Δt) using the SOH predicted values ​​SOH[i](t+Δt) of all the storage batteries 5[i] constituting the battery system 1. The target SOH predicted value is a target deterioration evaluation value after Δt, for example, an average value of the deterioration evaluation values ​​of the storage batteries 5[i], and is represented as SOHave(t+Δt).

[0094] If the sharing adjustment rate of the storage battery 5[i] is α[i](t), the sharing adjustment rate α[i](t) is expressed by the following equation (10).

[0095]

number

[0096] In equation (10), K is the adjustment gain. Further expanding equation (10) gives the following equation (11).

[0097]

number

[0098] By applying the sharing adjustment rate α[i](t) in equation (11) to the charging / discharging power obtained by dividing the system required power Pall by the number of operating batteries N, i.e., by using equation (2), the individual power commands for each operating battery can be calculated.

[0099] If you want to extend the system life to a target time (t+Δt), even if you calculate the sharing adjustment rate using the ambient temperature at that time (time t), the impact of the ambient temperature on the SOH occurs with a delay, so you should predict the ambient temperature in advance and calculate and apply the sharing adjustment rate for operation at that temperature without degradation suppression control. This makes it possible to keep the error after Δt low.

[0100] It is also known that a lower temperature extends the battery life of the storage battery 5. Therefore, based on the temperature information of the ambient temperature, control may be performed to lower the temperature of the air conditioning in the section in which the battery system 1 is installed.

[0101] Thus, according to this embodiment, SOH varies depending on the ambient temperature, and the effect of ambient temperature on SOH does not appear in real time. However, by calculating a sharing adjustment rate that predicts the effect of ambient temperature on SOH, appropriate power sharing can be performed based on SOH and ambient temperature.

[0102] <Additional Notes> The battery control system, the power supply and demand system, the battery control method, and the battery control program described in the above-described embodiments can be understood, for example, as follows.

[0103] A battery control system (10) of a first aspect of the present disclosure is a battery control system applied to a battery system (1) having a plurality of storage batteries (5), and includes: a sharing adjustment rate setting unit (40) that acquires deterioration evaluation information from a memory unit (60) in which deterioration evaluation information associated with identification information and SOH of the storage batteries is stored, and sets a sharing adjustment rate using the SOH of the plurality of storage batteries; and a power command setting unit (50) that sets individual power commands for each of the storage batteries using the sharing adjustment rate, calculates a target SOH using the SOH of each of the storage batteries that constitute the battery system, and sets the sharing adjustment rate for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH.

[0104] Since the sharing adjustment rate of each storage battery is set based on the SOH, it is possible to appropriately share power so as to extend the life of the entire battery system by taking into account the variation in SOH between the storage batteries. In particular, when the battery system is an AC link, individual power commands can be directly input to the AC / DC converter to share power. In addition, appropriate power sharing can reduce the initial amount of storage batteries required in the battery system.

[0105] The battery control system of the second aspect of the present disclosure, in the first aspect, includes a degradation state evaluation unit (20) that sequentially selects storage batteries to be evaluated for their degradation state, and calculates a SOH related to the degradation state of the storage batteries to be evaluated using a voltage value or a current value when charging and discharging of the storage batteries to be evaluated according to a preset charge and discharge pattern, and the power command setting unit may use the sharing adjustment rate to set individual power commands for each operational storage battery that is a storage battery other than the storage battery to be evaluated.

[0106] The degradation state evaluation unit can calculate and use the SOH, and the storage battery being evaluated is excluded from the power sharing, so that an accurate power sharing can be calculated.

[0107] In the battery control system of the third aspect of the present disclosure, in the second aspect, the storage batteries that are not being charged or discharged may be excluded from the operational storage batteries.

[0108] In power sharing based on the SOH, it is possible to exclude dormant batteries from operational batteries and calculate accurate power sharing.

[0109] A fourth aspect of the battery control system of the present disclosure is, in any one of the first to third aspects, a battery system in which each storage battery is connected via a DC link to which each storage battery is directly connected, and a command value is a value obtained by dividing an upper or lower limit value of an allowable voltage range for a target voltage of the DC link by an upper limit charge / discharge power of the storage battery and dividing the result by the sharing adjustment rate for each storage battery, and the power command setting unit may set the individual power command for each of the operational storage batteries using the command value for each storage battery.

[0110] By controlling the power of each battery based on a command value calculated from the sharing adjustment rate to make the SOH uniform, the lifespan of the entire battery system can be extended by controlling the SOH to be uniform, which varies. In addition, by sharing the power appropriately, the initial number of batteries installed in the battery system can be reduced. In particular, when the battery system is a DC link, the power command based on the command value can be input to the AC / DC converter to share the power.

[0111] A battery control system of a fifth aspect of the present disclosure, in any of the first to fourth aspects, may calculate a SOH prediction value, which is a prediction value of the future SOH of each storage battery, using the SOH of each storage battery, the charge / discharge current and charging rate of the storage battery, and the ambient temperature, set a target SOH prediction value using the SOH prediction values ​​of all the storage batteries that constitute the battery system, and set the sharing adjustment rate for each storage battery so as to bring the SOH prediction value of each storage battery closer to the target SOH prediction value.

[0112] SOH varies depending on the ambient temperature, and the effect of ambient temperature on SOH does not appear in real time. By calculating a sharing adjustment rate that predicts the effect of ambient temperature on SOH, appropriate power sharing can be achieved based on SOH and ambient temperature.

[0113] A battery control system of a sixth aspect of the present disclosure, in any of the first to fifth aspects, may adjust the sharing adjustment rate of the storage battery and calculate the sharing adjustment rate using an adjustment gain that is changeable according to the deterioration state.

[0114] By using the adjustment gain, it is possible to calculate an appropriate sharing adjustment rate for each case.

[0115] A battery control system according to a seventh aspect of the present disclosure may be configured in such a way that, in the sixth aspect, the adjustment gain is set to 1, and the sharing adjustment rate of each of the storage batteries is set to a value corresponding to the SOH of each of the storage batteries.

[0116] By setting the adjustment gain to 1, it is possible to calculate the sharing adjustment rate according to the SOH of each storage battery and share power. By sharing power according to the SOH, it is possible to align the amplitude of the state of charge (SOC) of each storage battery.

[0117] An electric power supply and demand system (100) according to an eighth aspect of the present disclosure includes a battery system including a plurality of storage batteries, and the battery control system according to any one of the first to seventh aspects.

[0118] A battery control method of a ninth aspect of the present disclosure is a battery control method applied to a battery system having a plurality of storage batteries, and includes a sharing adjustment rate setting process for acquiring deterioration evaluation information from a memory unit in which deterioration evaluation information associated with identification information and SOH of the storage batteries is stored, and setting a sharing adjustment rate using the SOH of the plurality of storage batteries, and a power command setting process for setting individual power commands for each of the storage batteries using the sharing adjustment rate, wherein a computer executes the process of calculating a target SOH using the SOH of each of the storage batteries that constitute the battery system, and setting the sharing adjustment rate for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH.

[0119] A battery control program according to a tenth aspect of the present disclosure causes a computer to execute the battery control method according to the ninth aspect.

[0120] Although the present disclosure has been described using the embodiments, the technical scope of the present disclosure is not limited to the scope described in the above embodiments. For example, in the embodiment of the present disclosure, a degradation state evaluation unit 20 is provided and the sharing adjustment rate of operational batteries other than the battery 5 being evaluated is calculated, but it is also possible to not provide a degradation state evaluation unit 20 and calculate the sharing adjustment rate for all operational batteries 5.

[0121] Furthermore, for example, the sharing adjustment rate setting unit 40 may exclude, from among the storage batteries 5, storage batteries 5 for which charging / discharging is suspended, from the operational storage batteries. For example, the sharing adjustment rate setting unit 40 may determine whether or not a storage battery 5 is suspending charging / discharging by acquiring the operation mode from each storage battery 5. For a storage battery 5 whose operation mode is suspended, the sharing adjustment rate setting unit 40 does not include it in the calculation of the sharing adjustment rate. [Explanation of symbols]

[0122] 1,1a: Battery system 2: Power system 3: Substation 4:AC Link 5(5a~5d):Storage battery 6: Grid monitoring system 7 (7a to 7d): Power conversion device 7'(7a'~7d'): Power conversion device 8: DC link 9: AC / DC converter 10, 10a: Battery control system 11: CPU 12: Main memory 13:Secondary storage device 14: Communication interface 15: Input device 16: Display 20: Deterioration state evaluation section 21: Selection Department 22: Measurement execution unit 23:Return control section 24: Evaluation value calculation unit 30: Data Management Department 40,40a: Sharing adjustment rate setting section 50,50a: Power command setting section 60: Storage section 100,100a: Electricity supply and demand system

Claims

1. A battery control system applied to a battery system including a plurality of storage batteries, a sharing adjustment rate setting unit that acquires deterioration assessment information from a storage unit in which deterioration assessment information in which identification information of the storage batteries and a SOH are associated with each other, and sets a sharing adjustment rate using the SOH of the plurality of storage batteries; a power command setting unit that sets an individual power command for each of the storage batteries using the sharing adjustment rate; Equipped with A battery control system that calculates a target SOH using the SOH of each of the storage batteries that constitute the battery system, and sets the sharing adjustment rate for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH.

2. a degradation state evaluation unit that sequentially selects storage batteries to be evaluated for a degradation state and calculates a SOH related to the degradation state of the storage battery to be evaluated by using a voltage value or a current value when charging and discharging of the storage battery to be evaluated in accordance with a preset charge and discharge pattern; The battery control system according to claim 1 , wherein the power command setting unit uses the sharing adjustment rate to set individual power commands for each of the operational batteries that are the batteries other than the battery being evaluated.

3. The battery control system according to claim 2 , wherein among the storage batteries, a storage battery that is not being charged or discharged is excluded from the operational storage batteries.

4. The battery system is connected by a DC link in which each storage battery is directly connected to the other storage battery, a command value is obtained by dividing an upper limit value or a lower limit value of an allowable voltage range for the target voltage of the DC link by an upper limit charge / discharge power of the storage battery and dividing the result by the sharing adjustment rate for each storage battery; The battery control system according to claim 1 , wherein the power command setting unit sets the individual power command for each of the operational batteries by using the command value for each of the batteries.

5. calculating a predicted SOH value, which is a predicted value of the future SOH of each of the storage batteries, using the SOH for each of the storage batteries, a charge / discharge current and a charging rate of the storage batteries, and an ambient temperature; setting a target SOH predicted value using the SOH predicted values ​​of all the storage batteries constituting the battery system; The battery control system according to claim 1 , wherein the sharing adjustment rate is set for each of the storage batteries such that the SOH predicted value of each of the storage batteries approaches the target SOH predicted value.

6. The battery control system according to claim 1 , wherein the sharing adjustment rate of the storage battery is adjusted, and the sharing adjustment rate is calculated using an adjustment gain that is changeable according to a deterioration state.

7. The battery control system according to claim 6 , wherein the adjustment gain is set to 1, and the sharing adjustment rate of each of the storage batteries is set to a value according to the SOH of each of the storage batteries.

8. A battery system including a plurality of storage batteries; The battery control system according to claim 1 ; An electricity supply and demand system comprising:

9. A battery control method applied to a battery system including a plurality of storage batteries, a sharing adjustment rate setting step of acquiring deterioration assessment information from a storage unit in which deterioration assessment information in which identification information of the storage batteries and a SOH are associated with the deterioration assessment information is stored, and setting a sharing adjustment rate using the SOH of the plurality of storage batteries; a power command setting step of setting an individual power command for each of the storage batteries using the sharing adjustment rate; Equipped with A battery control method in which a computer executes a step of calculating a target SOH using the SOH of each of the storage batteries that constitute the battery system, and setting the sharing adjustment rate for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH.

10. A battery control program for causing a computer to execute the battery control method according to claim 9.

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