Battery control system, power supply and demand system equipped therewith, battery control method, and battery control program

Abstract

To provide a battery control system that can extend the time period in which the maximum and minimum charging rates of a storage battery reach the allowable upper and lower limits, thereby enabling further extension of the life of the entire battery system, a power demand and supply system equipped therewith, a battery control method, and a battery control program.SOLUTION: A battery control system is one applied to a battery system with multiple storage batteries, and includes an overall average calculation unit 81 that calculates the overall average charging rate that serves as a reference for the entire battery system using charging rate data of the multiple storage batteries over a predetermined period of time, an offset calculation unit 82 that calculates the overall offset power for bringing the overall average charging rate closer to a target charging rate, a system required power correction unit that corrects the system required power of the battery system using the overall offset power, and a power command setting unit that sets power commands for each of the storage batteries based on the corrected system required power.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Nowadays, in various environments where electricity is used, such as industrial plants, in anticipation of cases where the power supply from the power supply source is stopped or a large power supply is required locally, a storage battery capable of storing electricity is provided in addition to the power supply source to stabilize the power supply. In addition, since the deterioration of storage batteries over time is unavoidable due to their nature, methods for maintaining the charging rate of storage batteries at an appropriate state in order to extend the life of storage batteries and methods for accurately estimating the life of storage batteries are being studied.

[0003] Patent Document 1 discloses a method of determining an offset power value indicating charging or discharging using the difference between the amount of stored electricity in a storage battery and a target storage amount, which is a target value for the amount of stored electricity in the storage battery at the end of a supply and demand control period for the storage battery, and controlling the charging and discharging of the storage battery by applying a correction using the offset power value to a power value indicating the amount of charging and discharging of the storage battery. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2014 / 076918 Summary of the Invention [Problem to be solved by the invention]

[0005] The invention disclosed in Patent Document 1 is a control for preventing the state of charge (SOC) of a storage battery from becoming either 100% or 0% and for maintaining the state of charge of the storage battery at an appropriate level.

[0006] The batteries that make up the battery storage system are equipped with power conversion devices, a protection system (CMU) that controls each battery, and other devices, and these devices cause power loss. Since the amount of this power loss changes over time, the central value of the charge / discharge range of the entire battery system gradually changes. If this state continues and the central value of the charge / discharge range of the entire battery system rises or falls, the minimum or maximum charging rate of some of the batteries will be more likely to reach the upper or lower allowable limits of the batteries, which may shorten the life of the entire battery system.

[0007] The present disclosure aims to provide a battery control system that can extend the time until the maximum and minimum charging rates of a storage battery reach the allowable upper and lower limits, thereby further extending the life of the entire battery system, a power supply and demand system equipped with the same, a battery control method, and a battery control program. [Means for solving the problem]

[0008] A battery control system according to some embodiments of the present disclosure is a battery control system applied to a battery system having a plurality of storage batteries, and includes an overall average calculation unit that calculates an overall average charging rate that serves as a reference for the entire battery system using charging rate data of the plurality of storage batteries over a predetermined period of time, an offset calculation unit that calculates an overall offset power for bringing the overall average charging rate closer to a target charging rate, a system required power correction unit that corrects the system required power of the battery system using the overall offset power, and a power command setting unit that sets a power command for each of the storage batteries based on the corrected system required power.

[0009] A battery control system according to some embodiments of the present disclosure is a battery control system applied to a battery system having a plurality of storage batteries, and includes a charging rate determination unit that determines an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period of time, an offset calculation unit that calculates an overall offset power for bringing closer to zero the difference between an allowable upper limit value of a range of charging rates at which the plurality of storage batteries can operate normally and the upper limit representative charging rate, and the difference between an allowable lower limit value of the range of charging rates at which the plurality of storage batteries can operate normally and the lower limit representative charging rate, a system required power correction unit that corrects the system required power of the battery system using the overall offset power, and a power command setting unit that sets a power command for each of the storage batteries based on the corrected system required power.

[0010] A battery control method according to some embodiments of the present disclosure is a battery control method applied to a battery system including a plurality of storage batteries, and includes the steps of: calculating an overall average charging rate that serves as a benchmark for the entire battery system using charging rate data of the plurality of storage batteries over a predetermined period; calculating an overall offset power for bringing the overall average charging rate closer to a target charging rate; correcting a system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power.

[0011] A battery control method according to some embodiments of the present disclosure is a battery control method applied to a battery system including a plurality of storage batteries, and includes the steps of: using charging rate data of the battery system for a predetermined period, calculating an overall offset power for bringing closer to zero a difference between an allowable upper limit value of a range of charging rates at which the plurality of storage batteries can operate normally and the upper limit representative charging rate, and a difference between an allowable lower limit value of the range of charging rates at which the plurality of storage batteries can operate normally and the lower limit representative charging rate; correcting a system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power.

[0012] A battery control program according to some embodiments of the present disclosure is a battery control program applied to a battery system including a plurality of storage batteries, and causes a computer to execute the following processes: calculating an overall average charging rate that serves as a benchmark for the entire battery system using charging rate data for a specified period of the plurality of storage batteries; calculating an overall offset power for bringing the overall average charging rate closer to a target charging rate; correcting the system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power.

[0013] A battery control program according to some embodiments of the present disclosure is a battery control program applied to a battery system including a plurality of storage batteries, and causes a computer to execute the following processes: determining an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period; calculating an overall offset power for bringing closer to zero the difference between the upper limit value of the range of charging rates at which the plurality of storage batteries can operate normally and the upper limit representative charging rate, and the difference between the lower limit value of the range of charging rates at which the plurality of storage batteries can operate normally and the lower limit representative charging rate; correcting the system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power. Effect of the Invention

[0014] According to the present disclosure, it is possible to extend the time until the maximum and minimum charging rates of the storage battery reach the allowable upper and lower limits, respectively, thereby achieving the effect of further extending the life of the entire battery system. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram illustrating a schematic configuration of an electricity supply and demand system according to an embodiment of the present disclosure. [Diagram 2]FIG. 2 is a diagram illustrating an example of a hardware configuration of a battery control system. [Diagram 3] FIG. 2 is a functional configuration diagram illustrating an example of functions of a battery control system according to an embodiment of the present disclosure. [Figure 4] 1 is a functional configuration diagram illustrating an example of functions included in an overall offset power setting unit according to an embodiment of the present disclosure. FIG. [Diagram 5] FIG. 10 is a diagram for explaining the tendency for the center of the charging rate of the entire battery system to shift over time. [Figure 6] 1 is an example logic circuit diagram for correcting a system required power Pall using a total offset power according to an embodiment of the present disclosure. [Figure 7] FIG. 13 is a diagram for explaining how the center of the charging rate of the entire battery system is aligned by setting an individual power command using the corrected system required power. [Figure 8] 1 is a functional configuration diagram illustrating an example of functions included in an overall offset power setting unit according to an embodiment of the present disclosure. FIG. [Figure 9] 1 is a diagram showing a schematic configuration of an electric power supply and demand system in which a battery system is connected to a DC link. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) Hereinafter, an embodiment of a battery control system, a power supply and demand system including the battery control system, a battery control method, and a battery control program according to the present disclosure will be described with reference to the drawings. 1 is a diagram showing a schematic configuration of an electric power supply and demand system 100 according to an embodiment of the present disclosure. As shown in FIG 1, the electric power supply and demand system 100 includes a battery system (ESS: Energy Storage System) 1 and a battery control system 10.

[0017] 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.

[0018] Each storage battery 5 is capable of charging and discharging, 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. Note that the configuration of the storage battery 5 may be any known technology as appropriate, and is not particularly limited.

[0019] 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 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.

[0020] 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 the system required power to be requested of the battery system 1 and transmits it to the battery control system 10.

[0021] 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 the battery control system 10. 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 12, a secondary storage 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 to each other via, for example, a bus 18.

[0022] 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.

[0023] Fig. 3 is a functional configuration diagram showing an example of functions of a battery control system 10 according to this embodiment. 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 shown 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, a storage unit 60, an overall offset power setting unit 80, and a system required power correction unit 90.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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. Furthermore, the storage unit 60 may store in advance degradation assessment information in which the identification information of each storage battery 5 is associated with a degradation assessment information value.

[0028] As a result, a larger sharing adjustment rate is set for a storage battery with a high degradation evaluation value (e.g., a high SOH) than for a storage battery with a low degradation evaluation value. A storage battery 5 with a high sharing adjustment rate is assigned a larger portion of the required power relative to the system required power than a storage battery 5 with a low sharing adjustment rate. That is, when charging, a storage battery with a high sharing adjustment rate charges more power than a storage battery with a low sharing adjustment rate, and when discharging, a storage battery with a high sharing adjustment rate discharges more power than a storage battery with a low sharing adjustment rate.

[0029] 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).

[0030] Sharing adjustment rate α(i)={1+K(ΔSOH(i) / SOHave)} (1)

[0031] 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.

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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Sharing adjustment rate α(i)={1+(ΔSOH(i) / SOHave)} (2)

[0038] If the target deterioration evaluation value SOHave is 50(%) and SOH(1) for i=1 is the same at 50(%), then ΔSOH(1)=50-50=0(%), and therefore the sharing adjustment rate α(1) is expressed by the following formula.

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

[0040] In this case, if SOHave is 50(%) and SOH(2) for i=2 = 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.

[0041] Sharing adjustment rate α(2)={1+(ΔSOH(2) / SOHave)}=2

[0042] 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 the behavior of the charging rate is almost the same.

[0043] 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.

[0044] 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.

[0045] The power command setting unit 50 calculates an individual power command Pdiv(i) for each operating battery using the sharing adjustment rate α(i) corresponding to each of the batteries 5a to 5d and the system required power Pall acquired from the grid monitoring system 6. Here, the operating battery is an operable battery, in other words, a battery capable of being controlled for charging and discharging in response to the system required power Pall. That is, the batteries for which degradation evaluation is performed by the above-mentioned degradation state evaluation unit 20 are excluded from the operating batteries.

[0046] 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 (3).

[0047] Pdiv(i)=Pall×(1 / N)×α(i) (3)

[0048] In the above formula (3), 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 other than the evaluation target can be an operational battery.

[0049] As can be seen from formula (3), 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.

[0050] The sum of the sharing adjustment rates α(i) of the operating batteries is expressed by the following equation (4).

[0051] Σα(i)=Σ{1+K(ΔSOH(i) / SOHave)}=Σ1=N (4)

[0052] The sum of the individual power commands Pdiv(i) for each operating battery is expressed by the following equation (5).

[0053] ΣPdiv(i)=ΣPall×(1 / N)×α(i)=Pall / N×Σα(i) (5)

[0054] Therefore, the sum of the individual power commands Pdiv(i) for each operating battery is expressed by the following equation (6) based on equations (4) and (5).

[0055] ΣPdiv(i)=Pall / N×N=Pall (6)

[0056] Therefore, except in cases where charging and discharging cannot be performed according to the individual power command Pdiv(i) due to limitations in the power converter, etc., the sum of the individual power commands Pdiv(i) for each operating storage battery is determined to match the system required power Pall.

[0057] Each storage battery 5 constituting the battery system 1 is equipped with a power conversion device 7, a protection system (CMU) that controls each storage battery, and other devices, and power loss occurs due to these devices. Because the amount of this power loss changes over time, the central value of the charge / discharge range for the entire battery system 1 changes gradually. For example, as shown in FIG. 5, in the early stages of operation, charging and discharging are performed around a charging rate of 50%, whereas in the middle to later stages of operation, charging and discharging may occur around a charging rate of 50% or less. In this way, when the central value of the charge / discharge range for the entire battery system decreases, the minimum charging rate (SOC in FIG. 5) may change. min ) may reach the lower limit of the battery's tolerance, shortening the lifespan of the entire battery system.

[0058] Therefore, the battery control system 10 according to this embodiment has a function for suppressing such a change in the central value of the charging rate of the entire battery system over time.

[0059] 3 is a functional configuration diagram showing an example of functions of the battery control system 10 according to this embodiment. As shown in FIG. 3, the battery control system 10 according to this embodiment includes an overall offset power setting unit 80 and a system required power correction unit 90. 4 is a functional configuration diagram showing an example of functions included in the total offset power setting section 80. As shown in FIG. 4, the total offset power setting section 80 includes a total average calculation section 81 and an offset calculation section .

[0060] The overall average calculation unit 81 calculates the overall average charging rate of the battery system 1, for example, by using charging rate data of the battery system 1 for a predetermined period. For example, the overall average calculation unit 81 calculates the average of moving averages calculated for each storage battery as the overall average charging rate. Alternatively, the maximum charging rate and the minimum charging rate for the entire battery system 1 for the predetermined period may be identified, and the average value of these values ​​may be calculated as the overall average charging rate. The overall average charging rate can be calculated by statistically processing the charging rate data of each storage battery for the predetermined period to calculate the median value of the charging rates, and a known technique may be appropriately adopted as a specific method for this.

[0061] The specific cycle of the above-mentioned predetermined period can be set appropriately depending on the operation of the battery system 1. For example, a simulation can be performed in advance, and the predetermined period can be set as a period during which the difference between the central value of the charging rate and the central value at the beginning of operation becomes equal to or greater than a predetermined value for the entire battery system.

[0062] The offset calculation unit 82 calculates an overall offset power for bringing the overall average charging rate of the battery system 1 closer to a target charging rate (e.g., 50%). For example, the offset calculation unit 82 calculates the deviation between the overall average charging rate and the target charging rate, and performs proportional-integral control on this deviation to calculate an overall offset power that makes the deviation zero. After calculating the total offset power Pg, the offset calculation unit 82 outputs the total offset power Pg to the data management unit 30. As a result, the total offset power Pg is stored in the storage unit 60, and the total offset power Pg is updated at predetermined intervals.

[0063] The system required power correction unit 90 corrects the system required power received from the grid monitoring system 6 using the total offset power Pg. For example, the system required power correction unit 90 reads out the total offset power Pg stored in the storage unit 60, and adds the total offset power Pg to the system required power Pall, thereby correcting the system required power Pall' (=Pall+Pg). This process is performed, for example, every time the system required power is received from the grid monitoring system 6.

[0064] The system required power correction unit 90 outputs the corrected system required power Pall' to the power command setting unit 50. The power command setting unit 50 acquires the sharing adjustment rate α(i) stored in the memory unit 60, and sets an individual power command Pdiv'(i) for the operating storage battery using the acquired sharing adjustment rate α(i) for each storage battery and the corrected system required power Pall'. For example, the individual power command Pdiv'(i) is given by the following equation (7).

[0065] Pdiv'(i)={Pall'×(1 / N)×α(i)} (7)

[0066] As a result, each operational storage battery is given an individual power command that is based on the SOH and that suppresses changes in the median value of the charging rate of the entire battery system over time, and charging and discharging of the power conversion device 7 is controlled based on this individual power command.

[0067] As described above, the battery control system 10 according to this embodiment includes an overall offset power setting unit 80 that calculates an overall offset power Pg for correcting the system required power, and a system required power correction unit 90 that corrects the system required power Pall using the overall offset power Pg. The overall offset power setting unit 80 also includes an overall average calculation unit 81 that calculates an overall average charging rate, which is an average charging rate of the battery system 1, using, for example, charging rate data of the battery system 1 during a predetermined period, and an offset calculation unit 82 that calculates an overall offset power for bringing the overall average charging rate closer to a predetermined reference charging rate. The power command setting unit 50 sets individual power commands for each operational storage battery using the sharing adjustment rate α(i) and the corrected system required power Pall'.

[0068] (Total offset power calculation method 1) Next, a specific example of a method for calculating the total offset power Pg will be described. Fig. 6 is a diagram illustrating an example of a logic circuit for correcting the system required power Pall using the total offset power Pg according to an embodiment of the present disclosure. The overall average calculation unit 81 calculates the overall average charging rate using the charging rate data of each storage battery. For example, each storage battery is assigned a management number, and the overall average calculation unit 81 calculates the moving average of the charging rate for each storage battery from the first storage battery to the i-th storage battery. The moving average of the charging rate for each storage battery may be calculated in a plurality of stages with different calculation conditions. For example, when the predetermined period for acquiring the charging rate of each storage battery is one week, the calculation condition of the moving average in the predetermined period may be two stages, a pre-processing moving average and a post-processing moving average. For example, in the pre-processing moving average, a moving average of 60 samples is calculated with a sampling time of 60 seconds. That is, in the pre-processing moving average, a moving average of the charging rate for 3600 seconds (1 hour) is calculated by 60 seconds x 60 samples. In addition, the calculation result of the pre-processing moving average may be updated every hour. In addition, for example, in the post-processing moving average, a moving average of 168 samples is calculated with a sampling time of 3600 seconds (1 hour). That is, in the post-processing moving average, a moving average of the charging rate for 604800 seconds (one week) is calculated using 168 pieces of 3600 seconds. The calculation result of the post-processing moving average may be updated every week. In this way, the moving average is calculated for a relatively short predetermined period, and the calculated result is used to calculate a moving average for a longer predetermined period, thereby allowing the moving average of the charging rate of the storage battery to be calculated accurately.

[0069] Next, the overall average calculation unit 81 calculates the average of the moving averages of the charging rates of the respective storage batteries during a predetermined period (overall average charging rate SOC ALLAVG Next, the offset calculation unit 82 calculates the overall average charging rate as the target charging rate SOC TRG For example, the offset calculation unit 82 calculates the total offset power Pg to bring the total average charging rate SOC ALLAVG and target charging rate SOC TRGA deviation from the battery power output is calculated, and proportional-integral control is performed on the deviation to calculate an overall offset power Pg that makes the deviation zero. The overall offset power Pg may also include an initial offset power Pg0 for compensating for power loss in each device included in the battery system 1. Specifically, for example, the overall offset power Pg is calculated by the following formula (8). In formula (8), KP1 is a proportional gain in the proportional-integral control, and KI1 is an integral gain in the proportional-integral control.

[0070]

number

[0071] The offset calculation unit 82 outputs the total offset power Pg calculated by equation (8) to the data management unit 30, and the total offset power Pg is stored in the storage unit 60. Then, the system required power correction unit 90 corrects the system required power Pall' received from the grid monitoring system 6 using the total offset power Pg. Then, the power command setting unit 50 sets the individual power command Pdiv'(i) of the storage battery using the above-mentioned equation (7).

[0072] As described above, according to the battery control system 10 of this embodiment, the total offset power Pg for correcting the system required power Pall is calculated, and the system required power Pall is corrected using the total offset power Pg, thereby providing an individual power command that suppresses changes over time in the central value of the charging rate of the entire battery system including a plurality of storage batteries, and charging and discharging control of the power conversion device 7 can be performed based on this individual power command. This makes it possible to suppress changes over time in the central value of the charging rate of the entire battery system. As a result, it is possible to lengthen the time until the maximum and minimum values ​​of the charging rates of the storage batteries reach the allowable upper and lower limits, and it is possible to further extend the life of the entire battery system.

[0073] In addition, the overall average calculation unit 81 calculates the moving average of the charging rate for each storage battery and then calculates the overall average charging rate, so that the tendency of the charging rate change can be accurately grasped even in an operation pattern in which the charging rate changes instantaneously.

[0074] (Total offset power calculation method 2) In the above description, a moving average is used to calculate the individual average charging rate of the storage battery, but other calculation methods may be used. In the following, the overall average charging rate is calculated using the maximum charging rate and the minimum charging rate of each storage battery in a predetermined period. For example, the overall average calculation unit 81 calculates the maximum charging rate SOC(i) of each storage battery in a predetermined period. MAX and minimum charge rate SOC(i) MIN Identify the maximum charging rate SOC(i) MAX and minimum charge rate SOC(i) MIN Using the central charging rate SOC(i) for each storage battery CENTER Calculate.

[0075] In addition, the overall average calculation unit 81 calculates the central charging rate SOC(i) for each storage battery. CENTER Using this, calculate the average of multiple central charging rates, and calculate the overall average charging rate SOC ALLAVG Specifically, the overall average charging rate SOC is calculated by the following equations (9) to (11): ALLAVG First, the maximum charging rate SOC(i) of each storage battery is calculated from equation (9). MAX and minimum charge rate SOC(i) MIN Using the central charge rate SOC(i) CENTER Calculate.

[0076]

number

[0077] Next, the offset calculation unit 82 calculates the central charging rate SOC(i) for each storage battery calculated by the overall average calculation unit 81 using the following formula (10): CENTER The overall average charge rate SOC AVGUsing the overall average charging rate SOC AVG and target charging rate SOC TRG (For example, 50%) is calculated as the charging rate deviation ΔSOC.

[0078]

number

[0079] Next, the offset calculation unit 82 calculates the total offset power Pg by using the charging rate deviation ΔSOC calculated by the formula (10) according to the following formulas (11) and (12). In the following formula (11), h is the offset power gain, and Q nom is the rated battery capacity, and Δt is the offset period.

[0080]

number

[0081]

number

[0082] Then, the system required power correction unit 90 corrects the system required power Pall' using the total offset power Pg calculated by the formula (12). Then, the corrected system required power Pall' is substituted into the above formula (7) to calculate the individual power command Pdiv'(i) corresponding to each storage battery.

[0083] In this manner, the maximum and minimum charging rates of each storage battery are used to calculate the total offset power, and then the individual power commands corresponding to each storage battery are calculated using the total offset power. As a result, as shown in FIG. 7, it is possible to bring the central charging rate of each storage battery closer to the target charging rate.

[0084] As described above, by specifying the maximum charging rate and the minimum charging rate and calculating the individual average charging rate and the overall average charging rate instead of calculating the moving average of the charging rates of the storage batteries, it is possible to calculate the overall average charging rate with less memory capacity than when calculating the moving average. In other words, it is possible to reduce the calculation cost of the individual average charging rate and the overall average charging rate. Furthermore, since the calculation cost is reduced compared to when calculating the moving average of the charging rates of the storage batteries, it is possible to quickly respond to changes in the charging rates of the storage batteries.

[0085] (Total offset power calculation method 3) A method of calculating an overall average charging rate using a maximum moving average charging rate, which is the maximum value of the moving average charging rate for each storage battery in a predetermined period, and a minimum moving average charging rate, which is the minimum value, will be described below. The overall average calculation unit 81 specifies the maximum moving average charging rate and the minimum moving average charging rate for each storage battery in a predetermined period, and calculates the central moving average charging rate for each storage battery using the specified maximum moving average charging rate and minimum moving average charging rate. Note that, as a method for specifying the maximum moving average and the minimum moving average, for example, the overall average calculation unit 81 may calculate the average of the charging rate in each section obtained by dividing the predetermined period into a plurality of sections, specify the maximum value of the calculated averages as the maximum moving average, and specify the minimum value of the calculated moving averages as the minimum moving average.

[0086] The overall average calculation unit 81 calculates the average of the multiple center moving average charging rates using the center moving average charging rate for each storage battery, and sets the calculation result as the overall average charging rate. Then, using the calculated overall average charging rate in a manner similar to the calculation method 1 described above, the system required power and individual power commands corresponding to each battery are calculated.

[0087] As described above, by calculating the individual average charging rate and the overall average charging rate using the maximum moving average charging rate and the minimum moving average charging rate, it is possible to accurately grasp the trend of changes in the charging rate even for driving patterns in which the charging rate changes instantaneously, while suppressing calculation costs.

[0088] (Total offset power calculation method 4) A method for calculating an overall average charging rate using the maximum charging rate and the minimum charging rate for each storage battery in a predetermined period will be described below. For example, the overall average calculation unit 81 identifies the maximum charging rate and the minimum charging rate for each storage battery in a predetermined period, and further identifies the maximum value among the multiple maximum charging rates and the minimum value among the multiple minimum charging rates. Then, the overall average charging rate is calculated using the maximum value among the multiple maximum charging rates and the minimum value among the multiple minimum charging rates.

[0089] The overall average calculation unit 81 calculates the average of the maximum value among the multiple maximum charging rates and the minimum value among the multiple minimum charging rates, and sets the calculation result as the overall average charging rate. Then, in a manner similar to the above-mentioned calculation method 1, the system required power and individual power commands corresponding to each battery are calculated using the calculated overall average charging rate.

[0090] As described above, the overall average calculation unit 81 can calculate the overall average charging rate using the maximum value among the multiple maximum charging rates and the minimum value among the multiple minimum charging rates, thereby calculating the overall average charging rate with less memory capacity. That is, the calculation cost of the individual average charging rate and the overall average charging rate can be reduced. Furthermore, since the calculation cost is reduced compared to the case of calculating a moving average of the charging rate for each storage battery, it is possible to quickly respond to changes in the charging rate of the storage battery.

[0091] Second embodiment In the first embodiment, the total offset power is calculated using the total average charging rate of the battery system 1, but this is not limited to this. In the present embodiment, a method for setting the total offset power for operating the battery system 1 in consideration of the range in which the charging rate of each storage battery can be normally operated will be described. FIG. 8 shows a functional configuration diagram of a total offset power setting unit 80a according to the second embodiment. As shown in FIG. 8, the total offset power setting unit 80a includes a charging rate determination unit 83 and an offset calculation unit 84.

[0092] The charging rate determination unit 83 determines the upper limit representative charging rate and the lower limit representative charging rate of the battery system 1 using the charging rate data of the battery system 1 during a predetermined period. The upper limit representative charging rate is a representative value treated as the maximum value of the charging rate for each storage battery, and similarly, the lower limit representative charging rate is a representative value treated as the minimum value of the charging rate for each storage battery. In this embodiment, for example, the maximum moving average charging rate is determined as the upper limit representative charging rate, and the minimum moving average is determined as the lower limit representative charging rate. The method of determining the maximum moving average and the minimum moving average may be such that the maximum value of the averages of the charging rates in each section obtained by dividing the predetermined period into a plurality of sections is determined as the maximum moving average, and the minimum value of the calculated moving averages is determined as the minimum moving average. In this way, by using the moving average, it is possible to have the same function as a filter such as a noise removal filter. In addition, a first-order lag filter may be used in consideration of the limit of the data capacity required for the moving average.

[0093] Without being limited to this example, the maximum charging rate of the battery system 1 may be determined as the upper limit representative charging rate, and the minimum charging rate of the battery system 1 may be determined as the lower limit representative charging rate. The upper limit representative charging rate and the lower limit representative charging rate are not limited to this. For example, the average value of the maximum charging rates of the storage batteries 5a-5d may be set as the upper limit representative charging rate, and the average value of the minimum charging rates of the storage batteries 5a-5d may be set as the lower limit representative charging rate. Furthermore, the upper limit representative charging rate and the lower limit representative charging rate may be determined using statistical processing such as moving average.

[0094] The offset calculation unit 84 calculates the difference between the maximum moving average charging rate and the allowable upper limit of the charging rate (upper limit difference) and the difference between the minimum moving average charging rate and the allowable lower limit of the charging rate (lower limit difference), and calculates the total offset power for bringing the deviation between the upper limit difference and the lower limit difference closer to zero. The offset calculation unit 84 calculates the total offset power, for example, by performing proportional-integral control on the deviation.

[0095] In this embodiment, the state where the difference between the upper limit difference and the lower limit difference is zero is, in other words, a state where the margin of the maximum moving average charging rate relative to the allowable upper limit value of the charging rate is equal to the margin of the minimum moving average charging rate relative to the allowable lower limit value of the charging rate. According to the entire offset power setting unit 80a of this embodiment, by bringing the difference between the upper limit difference and the lower limit difference closer to zero, it is possible to control the operational fluctuation range of the charging rate of the entire battery system at about the center between the allowable upper limit value and the allowable lower limit value. This makes it possible to suppress the center of the operational fluctuation range of the charging rate of the entire battery system from gradually shifting, and to extend the life of the entire battery system.

[0096] The battery control systems 10, 10a according to the first and second embodiments are also applicable to the case where the battery system 1a is connected to a DC link 8 as shown in Fig. 9. In a power supply and demand system 100a shown in Fig. 9, the battery system 1a is connected to the DC link 8 via a power conversion device 7' (7a' to 7d') which is a DC / DC converter. The DC link 8 and a substation 3 are connected via an AC / DC converter 9. In this case, the system required power correction unit 90 is omitted, and the total offset power calculated by the total offset power setting unit 80 is provided to the AC / DC converter 9, which performs power control based on the total offset power.

[0097] Furthermore, the battery control systems 10, 10a according to the first and second embodiments described above may include an individual offset power setting unit that sets an individual offset power for each storage battery. In this way, by further adding a configuration that corrects the individual power command for each operational storage battery using the individual offset power, it is possible to suppress the deviation over time of the central value of the charging rate of the entire battery system and the deviation of the central values ​​of the charging rates of the storage batteries constituting the battery system 1.

[0098] Although the present disclosure has been described above using the embodiments, the technical scope of the present disclosure is not limited to the scope described in the above embodiments. Various modifications or improvements can be made to the above embodiments without departing from the gist of the disclosure, and the forms in which such modifications or improvements are made are also included in the technical scope of the present disclosure. In addition, the above embodiments may be appropriately combined. Furthermore, the processing flow described in the above embodiment is also one example, and unnecessary steps may be deleted, new steps may be added, or the processing order may be rearranged, without departing from the spirit of the present disclosure.

[0099] For example, in each of the above-described embodiments, the battery control system 10, 10a is described as including the storage unit 60, but there is no particular limitation on the location of the storage unit 60. For example, the storage unit 60 may be configured to be accessible by the battery control system 10, 10a, and may be configured to enable data to be read from and written to the storage unit via a network, for example.

[0100] (Additional Notes) The battery control system, the power supply and demand system including the battery control system, the battery control method, and the battery control program described in the above-described embodiments can be understood, for example, as follows. A battery control system (10, 10a) according to a first aspect of the present disclosure is a battery control system applied to a battery system (1, 1a) having a plurality of storage batteries (5), and includes an overall average calculation unit (81) that calculates an overall average charging rate that serves as a reference for the entire battery system using charging rate data of the plurality of storage batteries over a predetermined period, an offset calculation unit (82) that calculates an overall offset power for bringing the overall average charging rate closer to a target charging rate, a system required power correction unit (90) that corrects a system required power of the battery system using the overall offset power, and a power command setting unit (50) that sets a power command for each of the storage batteries based on the corrected system required power.

[0101] According to the above aspect, an overall average charging rate, which is the average charging rate of the battery system over a predetermined period, is calculated, an overall offset power is calculated to bring the calculated overall average charging rate closer to a predetermined target charging rate, and the calculated overall offset power is used to correct the system required power. Then, an individual power command for each operating storage battery is set based on the corrected system required power. This makes it possible to suppress changes in the central value of the charging rate of the entire battery system over time. As a result, it is possible to extend the time until the maximum and minimum charging rates of the storage batteries reach the allowable upper and lower limits, and it is possible to further extend the life of the entire battery system.

[0102] In a battery control system (10, 10a) according to a second aspect of the present disclosure, in the above-mentioned first aspect, the overall average calculation unit (81) calculates the average of each moving average of the charging rate for each of the storage batteries (5) during the specified period as the overall average charging rate.

[0103] According to the above aspect, by calculating the average of each moving average of the charging rate for each storage battery as the overall average charging rate, it is possible to accurately grasp the trend of change in the charging rate even in an operation pattern in which the charging rate changes instantaneously.

[0104] In a battery control system (10, 10a) according to a third aspect of the present disclosure, in the first aspect, the overall average calculation unit (81) identifies a maximum charging rate and a minimum charging rate for each of the storage batteries (5) during the specified period, and calculates the overall average charging rate using the identified maximum charging rate and minimum charging rate.

[0105] According to the above aspect, the overall average charging rate can be calculated with a small memory capacity, so that the cost of calculating the overall average charging rate can be reduced.

[0106] In the battery control system (10, 10a) according to a fourth aspect of the present disclosure, in the first aspect, the overall average calculation unit (81) calculates a moving average charging rate, which is a moving average of the charging rates of the storage batteries (5) during the specified period, and calculates the overall average charging rate using a maximum moving average charging rate, which is the maximum value of the moving average charging rates, and a minimum moving average charging rate, which is the minimum value of the moving average charging rates.

[0107] According to the above aspect, by calculating the overall average charging rate using the maximum moving average charging rate and the minimum moving average charging rate, it is possible to accurately grasp the trend of changes in the charging rate even in a driving pattern in which the charging rate changes instantaneously, while suppressing calculation costs.

[0108] A battery control system (10, 10a) according to a fifth aspect of the present disclosure is a battery control system applied to a battery system (1, 1a) having a plurality of storage batteries (5), and includes a charging rate determination unit (83) that determines an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period, an offset calculation unit (84) that calculates an overall offset power for bringing closer to zero a difference between an allowable upper limit value of a range of charging rates at which the plurality of storage batteries can operate normally and the upper limit representative charging rate, and a difference between an allowable lower limit value of the range of charging rates at which the plurality of storage batteries can operate normally and the lower limit representative charging rate, a system required power correction unit (90) that corrects a system required power of the battery system using the overall offset power, and a power command setting unit (50) that sets a power command for each of the storage batteries based on the corrected system required power.

[0109] According to the above aspect, the maximum and minimum charging rates of the charging rate data are identified, and an overall offset power is calculated to bring the difference between the maximum charging rate and the allowable upper limit of the charging rate and the difference between the minimum charging rate and the allowable lower limit of the charging rate closer to zero. Then, the calculated overall offset power is used to correct the system required power, and an individual power command for each operating storage battery is set based on the corrected system required power. This makes it possible to suppress changes in the central value of the charging rate of the entire battery system over time. As a result, it is possible to extend the time until the maximum and minimum charging rates of the storage batteries reach the allowable upper and lower limits, and it is possible to further extend the life of the entire battery system. In addition, by using the maximum and minimum charging rates, it is possible to evenly arrange the charging and discharging width of the entire battery system between the allowable upper and lower limits, for example, even in cases where the charging and discharging control of the charging and discharging rates of some storage batteries is performed near the allowable upper and lower limits.

[0110] An electric power supply and demand system (100, 100a) according to a sixth aspect of the present disclosure, in any of the first to fifth aspects, 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 multiple storage batteries, wherein the power command setting unit uses the sharing adjustment rate to set individual power commands for each of the storage batteries, calculates a target SOH using the SOH of each of the storage batteries that constitute the battery system, sets the sharing adjustment rate for each of the storage batteries such that the SOH of each of the storage batteries approaches the target SOH, adjusts the sharing adjustment rate of the storage batteries, and sets an adjustment gain that is changeable according to the deterioration state to 1, and sets the sharing adjustment rate of each of the storage batteries to a value corresponding to the SOH of each of the storage batteries.

[0111] According to the above aspect, the sharing adjustment rate according to the SOH of each storage battery can be calculated and power sharing can be performed by setting the adjustment gain to 1. By sharing power according to the SOH, the amplitude of the state of charge (SOC) of each storage battery can be made uniform.

[0112] An electric power supply and demand system (100, 100a) according to a seventh aspect of the present disclosure includes a battery system (1, 1a) including a plurality of storage batteries, and the battery control system (10, 10a) according to the first or fifth aspect.

[0113] A battery control method according to an eighth aspect of the present disclosure is a battery control method applied to a battery system (1, 1a) having a plurality of storage batteries (5), and includes the steps of: calculating an overall average charging rate that serves as a reference for the entire battery system using charging rate data of the plurality of storage batteries over a predetermined period; calculating an overall offset power for bringing the overall average charging rate closer to a target charging rate; correcting a system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power.

[0114] A battery control method according to a ninth aspect of the present disclosure is a battery control method applied to a battery system (1, 1a) having a plurality of storage batteries (5), and includes the steps of: determining an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period; calculating an overall offset power for bringing a difference between an allowable upper limit value of a range of charging rates at which the plurality of storage batteries can operate normally and the upper limit representative charging rate, and a difference between an allowable lower limit value of the range of charging rates at which the plurality of storage batteries can operate normally and the lower limit representative charging rate closer to zero; correcting a system required power of the battery system using the overall offset power; correcting the system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power.

[0115] A battery control program according to a tenth aspect of the present disclosure is a battery control program applied to a battery system (1, 1a) having a plurality of storage batteries (5), and causes a computer to execute the following processes: calculating an overall average charging rate that serves as a benchmark for the entire battery system using charging rate data of the plurality of storage batteries over a predetermined period; calculating an overall offset power for bringing the overall average charging rate closer to a target charging rate; correcting a system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power.

[0116] A battery control program according to an eleventh aspect of the present disclosure is a battery control program applied to a battery system (1, 1a) having a plurality of storage batteries (5), and causes a computer to execute the following processes: determining an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period; calculating an overall offset power for bringing closer to zero the difference between the upper limit value of a range of charging rates at which the plurality of storage batteries can operate normally and the upper limit representative charging rate, and the difference between the lower limit value of a range of charging rates at which the plurality of storage batteries can operate normally and the lower limit representative charging rate; correcting the system required power of the battery system using the overall offset power; and setting a power command for each of the storage batteries based on the corrected system required power. [Explanation of symbols]

[0117] 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 18: Bus 20: Deterioration state evaluation section 30: Data Management Department 40: Share adjustment rate setting section 50: Power command setting section 60: Storage section 80, 80a: Overall offset power setting section 81: Overall average calculation section 82: Offset calculation section 83: Charging rate determination section 84: Offset calculation section 90: System required power correction 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, an overall average calculation unit that calculates an overall average charging rate that serves as a reference for the entire battery system using charging rate data of the plurality of storage batteries for a predetermined period; an offset calculation unit that calculates an overall offset power for bringing the overall average charging rate closer to a target charging rate; a system required power correction unit that corrects a system required power of the battery system using the total offset power; a power command setting unit that sets a power command for each storage battery based on the corrected system required power; A battery control system comprising:

2. The battery control system according to claim 1 , wherein the overall average calculation unit calculates an average of moving averages of the charging rates of the respective storage batteries during the predetermined period as the overall average charging rate.

3. 2. The battery control system according to claim 1, wherein the overall average calculation unit identifies a maximum charging rate and a minimum charging rate for each of the storage batteries during the specified period, and calculates the overall average charging rate using the identified maximum charging rate and minimum charging rate.

4. 2. The battery control system according to claim 1, wherein the overall average calculation unit calculates a moving average charging rate that is a moving average of the charging rates of the storage batteries during the specified period, and calculates the overall average charging rate using a maximum moving average charging rate that is a maximum value of the moving average charging rates and a minimum moving average charging rate that is a minimum value of the moving average charging rates.

5. A battery control system applied to a battery system including a plurality of storage batteries, a charging rate determination unit that determines an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period of time; an offset calculation unit that calculates an overall offset power for bringing a difference between an allowable upper limit of a range of charging rates at which the plurality of storage batteries can be normally operated and the upper limit representative charging rate, and a difference between an allowable lower limit of a range of charging rates at which the plurality of storage batteries can be normally operated and the lower limit representative charging rate, closer to zero; a system required power correction unit that corrects a system required power of the battery system using the total offset power; a power command setting unit that sets a power command for each storage battery based on the corrected system required power; A battery control system comprising:

6. a sharing adjustment rate setting unit that acquires deterioration evaluation information from a storage unit in which deterioration evaluation information in which identification information and a SOH of the storage batteries are associated with the deterioration evaluation information is stored, and sets a sharing adjustment rate using the SOH of the plurality of storage batteries; Preparation, The power command setting unit sets an individual power command for each of the storage batteries using the sharing adjustment rate; 6. The battery control system of claim 1, further comprising: a target SOH is calculated using the SOH of each of the storage batteries constituting the battery system; a sharing adjustment rate is set for each of the storage batteries so as to bring the SOH of each of the storage batteries closer to the target SOH; the sharing adjustment rate of each of the storage batteries is adjusted; an adjustment gain that is changeable according to the deterioration state 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.

7. A battery system including a plurality of storage batteries; The battery control system according to claim 1 or 5 . An electricity supply and demand system comprising:

8. A battery control method applied to a battery system including a plurality of storage batteries, calculating an overall average charging rate that serves as a reference for the entire battery system using charging rate data for a predetermined period of time for the plurality of storage batteries; calculating an overall offset power for bringing the overall average charging rate closer to a target charging rate; correcting a system power requirement of the battery system using the total offset power; setting a power command for each of the storage batteries based on the corrected system required power; The battery control method includes the steps of:

9. A battery control method applied to a battery system including a plurality of storage batteries, determining an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system during a predetermined period; calculating an overall offset power for bringing a difference between an allowable upper limit of a range of charging rates in which the plurality of storage batteries can be normally operated and the upper limit representative charging rate, and a difference between an allowable lower limit of a range of charging rates in which the plurality of storage batteries can be normally operated and the lower limit representative charging rate, closer to zero; correcting a system power requirement of the battery system using the total offset power; setting a power command for each of the storage batteries based on the corrected system required power; The battery control method includes the steps of:

10. A battery control program applied to a battery system including a plurality of storage batteries, A process of calculating an overall average charging rate that serves as a reference for the entire battery system using charging rate data for a predetermined period of time for the plurality of storage batteries; A process of calculating an overall offset power for bringing the overall average charging rate closer to a target charging rate; A process of correcting a system required power of the battery system using the total offset power; A process of setting a power command for each storage battery based on the corrected system required power. A battery control program for causing a computer to execute the above.

11. A battery control program applied to a battery system including a plurality of storage batteries, determining an upper limit representative charging rate and a lower limit representative charging rate of the battery system using charging rate data of the battery system for a predetermined period; A process of calculating an overall offset power for bringing a difference between an allowable upper limit value of a range of charging rates at which the plurality of storage batteries can be normally operated and the upper limit representative charging rate, and a difference between an allowable lower limit value of a range of charging rates at which the plurality of storage batteries can be normally operated and the lower limit representative charging rate, closer to zero; A process of correcting a system required power of the battery system using the total offset power; A process of setting a power command for each storage battery based on the corrected system required power. A battery control program for causing a computer to execute the above.

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