JP2020072525A - Control method of power storage apparatus, control device for power storage apparatus, and power storage system - Google Patents

Abstract

To provide a control method of a power storage apparatus, a control device for the power storage apparatus, and a power storage system having the control device for the power storage apparatus that have high effect of suppressing electric power even if a demand in a prescribed period (e.g., within 30 minutes) significantly changes.SOLUTION: A control method for a power storage apparatus 20 which supplies electric power to a load 50 is executed in a control apparatus 30 and includes the steps of: calculating an estimated demand which is a sum of a demand achievement calculated from received power which was received by the load 50 by a prescribed time from a start of a period at the prescribed time within the period and electric power predicted to be used in the load 50 by an end of the period from the prescribe time calculated on the basis of a predicted value; and when the estimated demand in the period exceeds the target value, setting a difference between the estimated demand and a target value as a scheduled power discharge amount for the power storage apparatus from the prescribed time to the end of the period.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power storage device control method, a power storage device control device, and a power storage system.

  There are several purposes for installing an electric power storage system in electric power consumers, one of which is to reduce electricity charges. Specifically, by discharging the stored electricity at the time of high demand, the contracted electric power can be reduced by suppressing the maximum electric power, that is, the basic electricity charge can be reduced. An electric power storage system generally includes an electric power storage device that actually charges and discharges electric power, and an electric power storage device control device that controls the charging and discharging. When the power storage device control device determines the charge / discharge amount, it is necessary to preserve the electric power in order to discharge it in the future high demand, while in order to suppress the maximum power, the appropriate amount is discharged in the high demand. Proper control of charge and discharge is important, such as charging in a timely manner without renewing the maximum power and preparing for later discharge. Therefore, conventionally, various controls are performed such that the power demand (power used in the load) is monitored, and the power demand exceeds the contract power to be discharged so that the received power falls within the contract power as a result. A device has been developed (see, for example, Patent Document 1).

JP, 2016-116401, A

  In contracts that use the contracted power that has become widespread in recent years as the actual amount system (the maximum demanded power for the past year is the contracted power), the demand for every 30 minutes is integrated with 30 minutes as one cycle, and the power as the 30-minute value is calculated. Calculate the maximum power demand using However, the actual demand changes every moment, and when the charge / discharge control of the power storage device is performed, it is necessary to suppress the power value as a 30-minute value without being caught by the instantaneous demand change. is there. However, with the conventional control technology, it is difficult to perform such control, and when the instantaneous demand fluctuates frequently, high-frequency charging / discharging is required. There was a problem that it would lead to a shortened life.

  The present invention has been made in view of such a problem, and a control method of a power storage device that has a large power suppression effect even when the demand changes drastically within a predetermined cycle (for example, within 30 minutes). An object of the present invention is to provide a power storage device control device in which a method for controlling a power storage device is implemented, and a power storage system having the power storage device control device.

  In order to solve the above problems, the control method of the power storage device according to the present invention, for each predetermined cycle, the predicted value of the power used in the load in each cycle, and the target value of the power received from the grid. A method for controlling a power storage device that acquires and controls the operation of a power storage device that supplies power to a load, wherein at a predetermined time within the cycle, from the start of the cycle to the predetermined time. The sum of the demand record calculated from the received power received by the load and the power predicted to be used by the load from the predetermined time calculated based on the predicted value to the end of the cycle. And a step of calculating the estimated demand, and when the estimated demand in the cycle exceeds the target value, the difference between the estimated demand and the target value is calculated from the predetermined time to the end of the cycle. Electricity And a step of setting a scheduled discharge amount of warehouse equipment.

  In the method for controlling a power storage device according to the present invention, the step of setting the planned discharge amount is such that the predetermined time is a predetermined time after the start of the cycle, and the estimated demand Exceeds the received power from the start of the cycle to the predetermined time, and when the received power exceeds the target value, the maximum discharge power amount of the power storage device, from the predetermined time of the cycle It is preferable to set the planned discharge amount of the power storage device until the end.

  Further, in such a control method of the power storage device according to the present invention, the step of setting the planned discharge amount, from the difference between the estimated demand and the target value and the maximum discharge power amount of the power storage device, When the battery level of the power storage device is small, it is preferable to set the battery level to the planned discharge amount of the power storage device from the predetermined time to the end of the cycle.

  Further, in the power storage device control method according to the present invention, the step of calculating the estimated demand and the step of setting the estimated discharge amount are repeatedly executed at predetermined time intervals shorter than the cycle. Preferably.

  Further, a power storage device control apparatus according to the present invention is mounted with the above-described power storage device control method, and controls the operation of the power storage device.

  The power storage system according to the present invention includes a power storage device that supplies power to a load, and the above-described power storage device control device that controls the operation of the power storage device.

  When the present invention is configured as described above, a method of controlling a power storage device that has a large effect of suppressing the power even when the demand changes drastically within a predetermined cycle (for example, within 30 minutes), and a method of controlling the power storage device. It is possible to provide a power storage device control device in which is mounted, and a power storage system having the power storage device control device.

It is a block diagram which shows the structure of an electric power storage system. It is an explanatory view for explaining charge / discharge amount determination processing. It is a flowchart which shows the flow of a charge / discharge amount determination process. It is a flowchart which shows the flow of the front | former stage of a scheduled charge / discharge amount calculation process. It is a flow chart which shows the flow of the latter part of a scheduled charging / discharging amount calculation processing. It is a graph which shows the result when a power storage device is drive | operated by the charge / discharge amount determination process (when only discharge is performed). It is a graph which shows the result when an electric power storage apparatus is drive | operated by charge / discharge amount determination processing (when charge / discharge is performed).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the configuration of a power storage system having a power storage device control device (hereinafter, simply referred to as a “control device”) in which the power storage device control method according to the present invention is implemented will be described with reference to FIG. 1. The power storage system 10 includes a power storage device 20 including a secondary battery and the like, and a control device 30 that controls an operating state of the power storage device 20. The power storage device 20 receives power supply from the grid 40 and stores (charges) power, or supplies the stored power to the load 50 (discharges) in response to a command signal from the control device 30. Is configured.

  The control device 30 includes a storage unit 32 that stores data and the like for controlling the power storage device 20, and a processing unit 31 that determines a charge / discharge amount of the power storage device 20 based on the data stored in the storage unit 32. , And are configured. The processing unit 31 is composed of a CPU of a computer, and the storage unit 32 is composed of a hard disk. The main function executed by the processing unit 31 is to measure the electric power (current demand) used by the load 50 and to use the electric power in each cycle every predetermined cycle (for example, 30 minutes). A process of storing the electric power (for example, the average value of the electric power used in the period or the amount of electric power used in the period) as history information, and the electric power used by the load 50 stored in the storage unit 32. Processing for determining the charge / discharge amount of the power storage device 20 by predicting demand from the history information (described above, for example, every 30 minutes).

  Here, the history information stored in the storage unit 32 includes not only the power (or the amount of power) used by the load 50, but also the power used by the load 50 in the past (for example, in the current month). The maximum value (hereinafter, referred to as “historical maximum power”) is also stored. Further, the storage unit 32 also stores a target value of electric power received from the grid 40 (contract electric power described above). Further, the demand forecast may be executed as another process in the control device 30 or may be executed by an external device via the network.

  Now, a process of determining the charge / discharge amount of the power storage device 20 (hereinafter, referred to as “charge / discharge amount determination process”) executed by the processing unit 31 of the control device 30 will be described with reference to FIGS. 2 to 5.

  As shown in FIG. 2, in the charge / discharge amount determination process, the control device 30 further divides a predetermined cycle into predetermined time intervals, and charges the power storage device 20 in the next time interval at predetermined time intervals. It is configured to determine the amount of discharge. Further, the control device 30 acquires the predicted power Pe (power used by the load 50 in the cycle), the target value Pt, and the maximum previous power Pmax that are determined for each predetermined cycle at the start of the cycle, and For each predetermined time interval, the actual value of the power used by the load 50 in the relevant cycle (hereinafter, referred to as “power received power Pa”) is acquired, and the charge / discharge amount of the power storage device 20 in the next time interval. To decide. In the following description, the predetermined cycle T is set to 30 minutes and the predetermined time interval ΔT is set to 1 minute, but the present invention is not limited to these values, and the cycle T and the time interval ΔT are not limited thereto. Can be set to any value. The processing shown in the flowcharts of FIGS. 3 to 5 shows the case where T = 30 minutes and ΔT = 1 minute.

  FIG. 3 shows the flow of the charge / discharge amount determination processing, and the control device 30 executes this charge / discharge amount determination processing at each of the above-described predetermined time intervals ΔT (here, one minute). When the charge / discharge amount determination processing is executed at a predetermined time interval ΔT in a predetermined cycle T, the number N of charge / discharge amount determination processing executed in the cycle T is given by the following equation (1). ROUNDUP is a function that rounds up the decimal point of the argument (calculation result).

N = ROUNDUP (T / ΔT) (1)

  As described above, when the period T = 30 minutes and the time interval ΔT = 1 minute, the number of charge / discharge amount determination processes N = 30. Further, in the charge / discharge amount determination process, if a variable that manages the number of times the charge / discharge amount determination process is executed within a predetermined cycle T is i (i is an integer), the range of the variable i is 0 to N−. 1 (0 to 29 when N = 30).

  As shown in FIG. 3, the processing unit 31 of the control device 30 determines whether or not the current execution count i is N-1 (29) which is the last execution of the current cycle (step S100). .. In the charging / discharging amount determination process according to the present embodiment, the charging / discharging of the power storage device 20 is not executed at i = 0 which is the first execution and i = N-1 (29) which is the last execution of the cycle. Is configured. Therefore, when the processing unit 31 determines that the current execution count i is N-1 (29) (step S100: Yes), the processing unit 31 sets the flag F indicating the charge / discharge state of the power storage device 20 to 0 indicating that charging / discharging is not performed is set (step S110), i is set to 0 (step S120), and the charging / discharging amount determination process is ended.

  When the processing unit 31 determines that the current execution count i is not N-1 (29) (step S100: No), the processing unit 31 determines whether the current execution count i is 0. (Step S130). When the processing unit 31 determines that the current execution count i is 0 (step S130: Yes), the processing unit 31 reads the predicted power Pe [kW] and the target value Pt [kW for the current cycle from the storage unit 32. ] And the past maximum power Pmax [kW] so far (step S140), 0 is set to the flag F indicating that charging / discharging is not performed (step S150), and 1 is added to the number of executions i (step S150). (S180), the charge / discharge amount determination process ends.

  When the processing unit 31 determines that the current execution count i is not 0 (step S130: No), the processing unit 31 reads from the storage unit 32 the remaining battery level Dpi [kWh] of the current power storage device 20, Also, in the current cycle, the received power Pa [kW] up to the current execution count i is acquired (step S160), and the scheduled charge / discharge amount calculation process is executed (step S170).

  As shown in FIG. 4, when the processing unit 31 executes the scheduled charge / discharge amount calculation process S170, first, it is determined whether or not the latest data at the present time (received power Pai and battery remaining amount Dpi) can be acquired. Yes (step S1701). When the processing unit 31 determines that the latest data has not been acquired (step S1701: No), the processing unit 31 sets the flag F to 0, which indicates that charging / discharging is not performed, as illustrated in FIG. (Step S1719), the planned charge / discharge amount calculation processing S170 is ended.

  Returning to FIG. 4, when the processing unit 31 determines that the latest data has been acquired (step S1701: Yes), the processing unit 31 loads the load 50 from the start of the current cycle to the current execution count i. In step S1702, the demand record ΔPi [kWh], which is the amount of electric power actually used, is calculated. Here, the demand record ΔPi at the execution count i is the amount of power calculated from the received power Pa that is the power received from the grid 40 from the beginning (i = 0) of the current cycle in FIG. 2 to i.

  The processing unit 31 also calculates the demand performance ΔPi from the start of the current cycle calculated in step S1702 to the current execution count i, and the current execution count i calculated from the predicted power Pe to the end of the current cycle. Using the electric energy estimated to be used, the estimated demand Qi in the current cycle estimated in the execution count i is calculated based on the following equation (2) (step S1703).

Qi = ΔPi + Pe × (N−i) / 60 (2)

  As described above, when the period T is 30 minutes, N = 30 in the equation (2). In the calculation of the amount of power estimated to be used from the current number of executions i calculated from the predicted power Pe to the end of the current cycle, dividing by 60 means that the amount of power for the cycle T is 1 This is because it is converted into the electric energy (kWh) of time.

-Determination of planned discharge-
Next, the processing section 31 determines whether or not all the following conditions (i) to (iii) are satisfied (step S1704).

  The condition (i) is that, in the current cycle T, a predetermined time has elapsed from the start of the cycle T (the charge / discharge amount determination processing has been executed a predetermined number of times). Further, the condition (ii) is that the relationship of the conditional expression (3) shown below is satisfied, and the condition (iii) is that the relationship of the conditional expression (4) shown below is satisfied.

(ΔPi / i) × 60> Qi × (60/30) (3)
(ΔPi / i) × 60> Pt (4)

  In conditional expression (3), the electric power calculated from the demand actual result ΔPi from the start of the current cycle to the number of executions i (the average value [kW] of the received electric power Pa that is the actual value) is calculated from the estimated demand electric energy Qi. Power (value obtained by converting the amount of power for 30 minutes into power [kW]) is exceeded. In conditional expression (4), the average value [kW] of the received power Pa that is the actual value is the target. It indicates that the value exceeds Pt [kW].

  When the processing unit 31 determines that all the above-described conditions (i) to (iii) are satisfied (step S1704: Yes), the processing unit 31 calculates the time i + 1 to the time i + 1 based on the following equation (5). The planned discharge amount Ddi [kWh] of the power storage device 20 at i + 2 is determined (step S1705), the flag F is set to 1 indicating discharging (step S1706), and the planned charge / discharge amount calculation process S170 is ended. MIN is a function that selects the minimum value of the arguments. Further, Ddmax is the maximum discharge power amount of the power storage device 20, and Dpi is the battery remaining amount at the execution count i.

Ddi = MIN (Ddmax / 60, Dpi / ΔT) (5)

  Expression (5) is defined by the above-described predetermined condition, that is, (i) a predetermined time has elapsed from the start of the cycle T (the charge / discharge amount determination process has been executed a predetermined number of times), and (ii ) When the demand record (received power) exceeds the estimated demand, and (iii) the demand record exceeds the target value, the planned discharge amount Dpi is set to the maximum discharge power amount of the power storage device 20 (the power storage device 20 in 1 minute). It is indicated that the maximum value of the amount of electric power that can be discharged is Ddmax). However, when the remaining battery amount (Dpi / ΔT) that can be discharged in one minute is smaller than the maximum discharge power amount Ddmax that can be discharged in one minute, the planned discharge amount Dpi is the remaining battery amount (the remaining battery amount Dpi is the time interval). Discharge evenly at ΔT).

  As will be described later, the control device 30 according to the present embodiment determines the discharge amount of the power storage device 20 so that the power received from the grid 40 does not exceed the contract power with respect to the power received by the load 50. When the received power of the load 50 is lower than the predicted power, the power stored in the power storage device 20 may be excessive and may not be fully utilized. Therefore, when the above-mentioned conditions (i) to (iii) are satisfied, discharging at the maximum discharge power of the power storage device 20 can contribute to maximum peak power suppression.

  On the other hand, when the processing unit 31 determines that at least one of the above-mentioned conditions (i) to (iii) is not satisfied (step S1704: No), the processing unit 31 determines the demand record Qi [kWh of the current cycle. ] Is converted into electric power [kW] by Qi × 60 / T (when T = 30 minutes, Qi × 60/30 = Qi × 2), and whether the value exceeds the target value Pt [kW]. It is determined (step S1707).

  When the processing unit 31 determines that the demand actual Qi × 2 [kW] exceeds the target value Pt [kW] (step S1707: Yes), the processing unit 31 is based on the equation (6) shown below. , The planned discharge amount Ddi [kWh] per minute of the power storage device 20 at the number of executions i + 1 to i + 2 is determined (step S1708), and the flag F is set to 1 indicating discharging (step S1709). The discharge amount calculation process S170 ends. As described above, when T = 30 minutes and ΔT = 1 minute, N = 30. Further, as described above, when T = 30 minutes, Qi × 60 / T = Qi × 2.

Ddi = MIN (
Ddmax / 60,
(Qi × 60 / T−Pt) × (T / 60) / (N− (i + 1)),
Dpi / ΔT) (6)

  Formula (6) determines the discharge amount in consideration of the battery remaining amount of the power storage device 20 in order to reduce the received power Pa from the grid 40 to the target value Pt or less when the estimated demand exceeds the target value. It is shown that. That is, when the demand in the current cycle T (for example, 30-minute frame) matches the estimated demand, the discharge amount required to suppress the power received from the grid 40 within the initial target value is calculated as "current cycle". The remaining discharge time (ΔT × (N− (i + 1)) minutes ”is obtained as the discharge amount required for discharging. Note that when the calculated discharge amount exceeds the maximum discharge power amount Ddmax of the power storage device 20, The planned discharge amount Ddi is set to the maximum discharge power amount Ddmax per minute, and when the calculated discharge amount exceeds the battery remaining amount Dpi, the planned discharge amount Ddi is evenly discharged over the battery remaining amount Dpi at time intervals ΔT. Set to do.

-Determination of planned charge-
In addition, when the processing unit 31 determines that the demand performance (Qi × 60 / T) converted into electric power does not exceed the target value Pt (step S1707: No), as illustrated in FIG. Determines whether the demand record Qi × 2 is below the target value Pt (step S1710). When the processing unit 31 determines that the demand record Qi × 2 is less than the target value Pt (step S1710: Yes), the processing unit 31 at time i + 1 to i + 2 based on the equation (7) shown below. The planned charge amount Dci [kWh] of the power storage device 20 is calculated (step S1711). However, Dcmax is the maximum charging power amount [kWh] of the power storage device 20, and Dpmax is the maximum battery capacity [kWh] of the power storage device 20.

Dci = MIN (
Dcmax / 60,
(Pt-Qi × 60 / T) / 60,
(Dpmax-Dpi) / ΔT)) (7)

  When the estimated demand is below the target value, the processing unit 31 determines whether or not to charge the power storage device 20, and the formula (7) indicates the planned charge amount Dci per minute. That is, the value per one minute (the value divided by 60 minutes) of the difference between the target value Pt [kW] and the value (Qi × 60 / T) obtained by converting the estimated demand Qi into the electric power [kW] is the planned charge amount Dci. And However, when the difference between the target value and the estimated demand exceeds the maximum charging power amount Dcmax of the power storage device 20, the maximum charging power amount Dcmax per minute is set as the planned charging amount Dci, and the target value and the estimated demand are calculated. When the amount of electric power per minute ((Dpmax-Dpi) / ΔT) required to charge the power storage device 20 from the current battery remaining amount Dpi to the maximum battery capacity Dpmax is smaller than the difference between The amount of electric power ((Dpmax-Dp) / ΔT) is set as the planned charge amount Dci.

  Next, the processing unit 31 obtains the value ((ΔPi / i) × 60) obtained by converting the average demand record ΔPi / i [kWh] into electric power [kW] from the start of the current cycle to the number of executions i. It is determined whether or not the maximum power Pmax is exceeded (step S1712). When the processing unit 31 determines that the actual demand exceeds the past maximum power (step S1712: Yes), the flag F is set to 0 indicating that charging is not performed even if the estimated demand is below the target value ( (Step S1713), the planned charge / discharge amount calculation processing S170 is ended.

  When the processing unit 31 determines that the demand record does not exceed the past maximum power (step S1712: No), the processing unit 31 sums the estimated demand Qi and the planned power reception amount Dci calculated in step S1711 [kWh]. Is converted into electric power [kW] ((Qi + Dpi) × 60 / T, and when T = 30 minutes, (Qi + Dci) × 2), it is determined whether or not the maximum past electric power Pmax is exceeded (step S1714). ). When the processing unit 31 determines that the total of the estimated demand and the planned power reception amount (value converted into electric power) exceeds the maximum past electric power (step S1714: Yes), the processing unit 31 further estimates It is determined whether or not the value (Qi × 60 / T) obtained by converting the demand Qi [kWh] into the electric power [kW] exceeds the maximum past electric power Pmax (step S1715).

  When the processing unit 31 determines that the estimated demand exceeds the maximum past electric power (step S1715: Yes), the flag F is set to 0 indicating that charging is not performed even if the estimated demand is less than the target value (( (Step S1716), the planned charge / discharge amount calculation processing S170 is ended. In addition, when the processing unit 31 determines that the estimated demand does not exceed the maximum existing power (step S1715: No), the scheduled charge amount Dci per minute is rewritten to the value of Expression (8) shown below ( In step S1717), the flag F is set to 2 indicating charging (step S1718), and the planned charge / discharge amount calculation process S170 ends.

Dci = (Pmax / (60 / T) −Qi) / ΔT (8)

  The expression (8) is a value obtained by evenly dividing the difference between the power amount corresponding to the maximum past power and the estimated demand in the current cycle for every one minute in the time interval ΔT, as the scheduled charge amount Dci.

  On the other hand, when the processing unit 31 determines that the total of the estimated demand and the planned power reception amount (value converted into electric power) does not exceed the maximum existing power (step S1714: No), the planned charging amount calculated in step S1711. Without changing Dci, the processing unit 31 sets the flag F to 2 indicating charging (step S1718), and ends the planned charge / discharge amount calculation processing S170. In addition, when the processing unit 31 determines that the demand record (Qi × 60 / T) is not below the target value Pt (step S1710: No), the demand record and the target value match, so the processing unit 31. Sets 0 to the flag F indicating that charging / discharging is not performed (step S1719), and ends the planned charge / discharge amount calculation processing S170.

  Returning to FIG. 3, when the scheduled charging / discharging amount calculation process of step S170 is completed, the processing unit 31 adds 1 to the current execution count i (step S180) and ends the charging / discharging amount determination process. The planned discharge amount Ddi or the planned charge amount Dci determined by the processing unit 31 at the number of executions i is applied to the control of the power storage device 20 for ΔT between the number of executions i + 1 and i + 2 according to the flag F. (The power storage device 20 is discharged or charged for ΔT at the discharge amount or charge amount per minute designated by the planned discharge amount Ddi or the scheduled charge amount Dci).

  6 and 7 show the results of controlling the power storage device 20 by the charge / discharge amount determination process described above. The control in FIGS. 6 and 7 is performed when T = 30 minutes and ΔT = 1 minute. FIG. 6 shows the control result for one cycle from 14:00 to 1:30. In this time zone, the power used by the load 50 is large and the power received from the grid 40 is reduced in order to reduce the received power. Only the discharge from the power storage device 20 is being executed. Further, FIG. 7 shows the control result of one cycle from 14:30 to 15:00, but in this time period, the electric power used by the load 50 is smaller than that in the case of FIG. 6. Therefore, not only the discharge from the power storage device 20 but also the charge to the power storage device 20 is performed when the received power from the grid 40 has a margin with respect to the power used by the load 50.

  The charging / discharging amount determination process described in the present embodiment does not control charging / discharging of the power storage device 20 based on the conventional daily demand forecast (daily load curve), but a certain interval (for example, ΔT = 1. Minute) to calculate the estimated demand Qi and repeat the subsequent demand forecast, and combine this demand forecast with the actual demand within a cycle (for example, T = 30 minutes) that is the basis for calculating the maximum power. The charge / discharge of the storage device 20 is controlled. Therefore, as is apparent from FIGS. 6 and 7, by performing the charge / discharge amount determination process described in the present embodiment, the charge / discharge of the power storage device 20 can be controlled without being caught by the instantaneous demand change. It is possible to approach the maximal suppression of the maximum electric power, and it is possible to suppress the charging / discharging frequency appropriately without repeating charging / discharging unnecessarily.

  In the control of charging / discharging of the power storage device 20 as described above, the discharge from the power storage device 20 is suppressed so that the power consumption of the load 50 can be increased. However, under certain conditions (under the above-mentioned conditions (i) to (iii)), the power storage device 20 may be hindered from maximally utilizing the maximum power consumption. Can be contributed to the maximum peak power suppression by adding the function of maximally discharging.

10 power storage system 20 power storage device 30 power storage device control device (control device)
40 system 50 load

Claims (6)

Electric power storage that controls the operation of the electric power storage device that supplies the electric power to the load by acquiring the predicted value of the electric power used by the load and the target value of the electric power received from the grid in each predetermined cycle A method of controlling equipment,
At a predetermined time within the cycle,
The actual demand calculated from the received power received by the load from the start of the cycle to the predetermined time and the predetermined time calculated based on the predicted value to the end of the cycle. Calculating an estimated demand that is the sum of the power expected to be used in the load,
When the estimated demand in the cycle exceeds the target value, the difference between the estimated demand and the target value is set to the planned discharge amount of the power storage device from the predetermined time to the end of the cycle. Steps,
And a method of controlling an electric power storage device. The step of setting the planned discharge amount,
The predetermined time has passed a predetermined time from the start of the cycle,
When the estimated demand exceeds the received power from the start of the cycle to the predetermined time, and when the received power exceeds the target value,
The method for controlling a power storage device according to claim 1, wherein the maximum discharge power amount of the power storage device is set to a planned discharge amount of the power storage device from the predetermined time to the end of the cycle. The step of setting the planned discharge amount,
When the battery remaining amount of the power storage device is smaller than the difference between the estimated demand and the target value and the maximum discharge power amount of the power storage device, the battery remaining amount is set to the end of the cycle from the predetermined time. The method of controlling the power storage device according to claim 1, wherein the scheduled discharge amount of the power storage device up to the time is set. The power storage device according to claim 1, wherein the step of calculating the estimated demand and the step of setting the estimated discharge amount are repeatedly executed at a predetermined time interval shorter than the cycle. Control method   A power storage device control apparatus, which implements the method for controlling a power storage device according to claim 1, and controls the operation of the power storage device. A power storage device that supplies power to the load,
The power storage device control device according to claim 5, which controls the operation of the power storage device.
Power storage system having a.