JP6954035B2 - Power storage control device, power storage control method, and power storage control program - Google Patents

Description

One aspect of the present invention relates to a power storage control device, a power storage control method, and a power storage control program.

A method of managing the charge / discharge of a power storage device has been conventionally known. For example, Patent Document 1 below describes a method for extending the life of a lead storage battery used in a natural energy utilization system. The lead-acid battery has a battery state measuring unit that measures the state of the lead-acid battery, an SOC model that shows the relationship between the output factor including the current, voltage, and temperature of the lead-acid battery and the state of charge of the lead-acid battery, and equal charging of the lead-acid battery. It has an even charging execution unit to carry out.

Japanese Patent No. 5447282

Since the amount of electricity generated by a power generation device that uses renewable energy and stored in the power storage device can also depend on the magnitude of the renewable energy, the state of power generation is also taken into consideration in order to improve the charging efficiency of the power storage device. Is desirable. However, some renewable energies, such as wind power, are unpredictable or very difficult to predict. Therefore, it is desired to improve the charging efficiency of the power storage device even when the regenerated energy whose fluctuation of the energy amount is difficult to predict is used.

The power storage control device according to one aspect of the present invention is a power storage control device that controls a power storage device that stores electricity generated from renewable energy, and acquires the amount of energy of the renewable energy and the charging state of the power storage device. The discharge rate of the power storage device is determined based on the acquisition unit, the estimation unit that estimates the charge rate of the power storage device based on the acquired energy amount, the estimated charge rate, and the acquired charge state. It includes a determination unit and an instruction unit that transmits a discharge instruction for discharging the power storage device at a determined discharge rate to the power storage device.

The power storage control method according to one aspect of the present invention is a power storage control method executed by a power storage control device that controls a power storage device that stores electricity generated from renewable energy, and is an energy storage amount of renewable energy and storage. An acquisition step for acquiring the charge state of the device, an estimation step for estimating the charge rate of the power storage device based on the acquired energy amount, and storage based on the estimated charge rate and the acquired charge state. It includes a determination step of determining the discharge rate of the device and an instruction step of transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.

The power storage control program according to one aspect of the present invention is a power storage control program that causes a computer to function as a power storage control device that controls a power storage device that stores electricity generated from renewable energy. Based on the acquisition step of acquiring the charge state of the power storage device, the estimation step of estimating the charge rate of the power storage device based on the acquired energy amount, the estimated charge rate, and the acquired charge state, The computer is made to execute a determination step of determining the discharge rate of the power storage device and an instruction step of transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.

In such an aspect, the degree of the amount of current to be stored in the power storage device (charge rate) is estimated, and the discharge from the power storage device is controlled based on the charge rate and the charge state of the power storage device. NS. In this way, by controlling the charging state of the power storage device in preparation for charging that is expected to occur in the near future, it is possible to improve the charging efficiency of the power storage device even when using regenerated energy for which it is difficult to predict fluctuations in the amount of energy. Will be possible.

According to one aspect of the present invention, it is possible to improve the charging efficiency of the power storage device even when the regenerated energy whose fluctuation of the energy amount is difficult to predict is used.

It is a figure which shows typically an example of the structure of a power storage system and its surroundings. It is a figure which shows the functional structure of the control controller (storage control device) which concerns on embodiment. It is a flowchart which shows the operation of the control controller (storage control device) which concerns on embodiment. It is a figure which shows the example of the discharge rate rule.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

[Overall configuration of power storage system]
The power storage control device according to the embodiment is a device that functions as a part of the power storage system 1. The power storage system 1 is a system that manages electricity generated by using renewable energy, and can be used in various places such as homes, offices, factories, and farms. One of the features of the power storage control device in the present embodiment is to improve the charging efficiency of the power storage device even when the regenerated energy whose fluctuation of the energy amount is difficult to predict is used.

Before explaining the power storage control device, the whole picture of the power system including the power storage system 1 will be described. FIG. 1 is a diagram schematically showing an example of the configuration of the power storage system 1 and its surroundings. The power storage system 1 is provided between the power generation device 2 and the power system 4. The direct current system including the power storage system 1 and the power generation device 2 and the alternating current system including the power system 4 are electrically connected via the PCS (power conditioning system) 3. The power storage system 1, the power generation device 2, and the PCS 3 are electrically connected via a DC (Direct Current) bus 5 through which a direct current flows. The power system 4 and the PCS 3 are electrically connected via an AC (Alternating Current) bus 6 through which an alternating current flows. The electricity generated by the power generation device 2 or the electricity stored in the power storage system 1 is supplied to the power system 4. Selling power is an example of supplying electricity to the power system 4. The power storage system 1 also plays a role of mitigating fluctuations in the power supply from the power generation device 2 to the power system 4 by using the storage battery like a cushion.

The power generation device 2 is a device that generates power using renewable energy. Wind power is an example of regenerated energy for which it is difficult to predict fluctuations in the amount of energy, and therefore, a wind power generator is an example of the power generation device 2. However, the power generation method and the type of the power generation device 2 are not limited in any way, and other power generation devices that utilize renewable energy may be used.

The power system 4 is a commercial power supply facility that integrates power generation, substation, power transmission, and distribution, and is provided by, for example, an electric power company.

The PCS3 is a device that converts direct current electricity into alternating current, and is a type of power converter. The PCS 3 has a DC terminal connected to the DC bus 5 and an AC terminal connected to the AC bus 6.

In the present embodiment, the power storage system 1 is connected to the measuring device 7 via the communication network 8. The measuring device 7 is a device that measures the amount of energy used by the power generation device 2 and transmits data indicating the measured amount of energy to the power storage system 1. The type and configuration of the measuring device 7 depends on the type of renewable energy. For example, if the renewable energy is wind power, the measuring device 7 acquires the amount of energy related to the wind, for example, the wind speed (m / s) or the air volume (unit: m ³ / min (CMM)) as the energy quantity. .. Examples of the wind measuring device 7 include a cup-type anemometer, a wind turbine-type anemometer, and an ultrasonic anemometer.

The power storage system 1 includes a power storage device 10, a power converter 20, and a control controller 30. One power converter 20 corresponds to one power storage device 10, and these two devices are electrically connected via a DC bus. The pair of the power storage device 10 and the power converter 20 that correspond to each other can also be referred to as a power storage unit. In the example of FIG. 1, the power storage system 1 includes three sets of power storage devices 10 and power converters 20 (three power storage units), but the number of sets is not limited and may be 1, 2, or 4 or more. When a plurality of power storage units are present, the performance of the power storage device 10 (for example, rated capacity, response speed, etc.) and the performance of the power converter 20 (for example, rated output, response speed, etc.) may be unified. It does not have to be unified. The control controller 30 is communicably connected to each power storage device 10 and each power converter 20 via a communication line 40.

The power storage device 10 is a device that converts the electricity generated by the power generation device 2 into chemical energy and stores it, and can be charged and discharged. The power storage device 10 can also be used to mitigate (level) fluctuations in the DC power generated by the power generation device 2. An example of the power storage device 10 is a storage battery such as a lead storage battery. The power storage device 10 includes a control function such as a battery control unit (BCU), and this control function can transmit data related to the power storage device 10 to the control controller 30.

The power converter 20 is a device that controls charging / discharging of the power storage device 10. The power converter 20 receives an instruction signal (data signal) from the control controller 30 and controls charging / discharging of the power storage device 10 based on the instruction signal. In the charge mode, the power converter 20 stores the electricity flowing from the power generation device 2 in the power storage device 10, in the discharge mode, the power storage device 10 is discharged to supply electric power to the outside, and in the stopped state, charging / discharging is performed. No. The power converter 20 can be, for example, a DC / DC converter.

[Configuration of integrated controller]
The control controller 30 is a computer (for example, a microcomputer) that controls the power converter 20 and the power storage device 10. FIG. 2 is a diagram showing a functional configuration of the control controller 30. As shown in this figure, the control controller 30 includes a processor 101, a memory 102, and a communication interface 103 as hardware devices. The processor 101 is, for example, a CPU, and the memory 102 is, for example, a flash memory. However, the types of hardware devices constituting the control controller 30 are not limited to these, and may be arbitrarily selected. Each function of the control controller 30 is realized by the processor 101 executing a program stored in the memory 102. For example, the processor 101 executes a predetermined calculation on the data read from the memory 102 or the data received via the communication interface 103, and outputs the calculation result to another device to display the other device. Control. Alternatively, the processor 101 stores the received data or the calculation result in the memory 102. The control controller 30 may be composed of one computer or a set of a plurality of computers (that is, a distributed system).

One of the features of the power storage system 1 is discharge control for increasing the charging efficiency of the power storage device 10, and this feature is particularly realized by the integrated controller 30. In the present embodiment, the power storage control device according to the present invention is applied to the control controller 30. Hereinafter, the functions and configurations of the integrated controller 30 regarding the discharge control of the power storage device 10 will be described.

The processor 101 functions as an acquisition unit 31, an estimation unit 32, a determination unit 33, and an instruction unit 34. The acquisition unit 31 is a functional element that acquires the amount of renewable energy and the charging state of the power storage device 10. The estimation unit 32 is a functional element that estimates the charge rate of the power storage device 10 based on the amount of energy thereof. The determination unit 33 is a functional element that determines at least the discharge rate of the power storage device 10 based on the charge rate and the charge state. The instruction unit 34 is a functional element that transmits a discharge instruction to the power storage device 10. The discharge instruction is a data signal for causing the power storage device 10 to perform discharge.

The charge rate is the amount of charge per unit time, and the discharge rate is the amount of discharge per unit time (generally, per hour). Both the charge rate and the discharge rate are represented by I / C when the current to be charged or discharged is I (A) and the battery capacity is C (Ah), and the unit is "C". For example, 1C represents the amount of current that charges or discharges the total capacity of the battery in 1 hour, 0.1C represents the amount of current that charges or discharges the total capacity of the battery in 10 hours, and 2C represents the total capacity of the battery 0. . Indicates the amount of current to be charged or discharged in 5 hours (30 minutes).

The memory 102 stores information necessary for the operation of the processor 101. For example, the memory 102 stores a charge rate rule 35 for determining the charge rate and a discharge rate rule 36 for determining the discharge rate. The charge rate rule 35 is information that describes a rule for estimating the charge rate from the amount of energy measured by the measuring device 7. The discharge rate rule 36 is information that describes a rule for determining the discharge rate from the charge rate and the charge state of the power storage device 10. The method of describing these rules is not limited. For example, charge rate rule 35 and discharge rate rule 36 may be represented by any of the formulas, algorithms, and correspondence tables, or by any combination of two or more of the formulas, algorithms, and correspondence tables. May be good. Alternatively, these rules may be part of a program executed by processor 101.

The charge rate rule 35 and the discharge rate rule 36 may be rewritable. For example, when the power generation device 2, the power storage device 10, or the power converter 20 is added, replaced, or removed, the administrator adjusts the charge rate rule 35 or the discharge rate rule in the memory 102 according to the change in the configuration. Rewrite 36. In this case, the administrator accesses the control controller 30 with a management computer (not shown) via a predetermined communication network (not shown), and a new charge rate rule 35 or discharge rate that reflects the configuration change. Rule 36 may be transferred to the control controller 30. This transfer rewrites the charge rate rule 35 and the discharge rate rule 36 in the memory 102.

The communication interface 103 cooperates with the processor 101 to transmit and receive data. For example, the communication interface 103 cooperates with the acquisition unit 31 to receive input data necessary for charge / discharge control. Further, the communication interface 103 cooperates with the instruction unit 34 to transmit a discharge instruction to the power converter 20.

[Operation of integrated controller]
The operation of the control controller 30 will be described with reference to FIGS. 3 and 4, and the power storage control method according to the present embodiment will be described. FIG. 3 is a flowchart showing an example of the operation of the control controller 30. FIG. 4 is a diagram showing an example of the discharge rate rule 36.

In step S11, the acquisition unit 31 acquires the amount of renewable energy (acquisition step). The acquisition unit 31 acquires the amount of energy by receiving the data transmitted from the measuring device 7.

In step S12, the estimation unit 32 estimates the charge rate based on the amount of energy (estimation step). The estimation unit 32 identifies the charge rate corresponding to the acquired energy amount with reference to the charge rate rule 35. For example, assume that the charge rate rule 35 indicates the relationship between the wind speed (energy amount) and the generated power amount (power curve) of the wind power generator and the relationship between the power amount and the current amount. In this case, the estimation unit 32 calculates the amount of current from the wind speed (amount of energy). Then, the estimation unit 32 calculates the charge rate from the amount of current and the capacity of the power storage device 10. The method of estimating the charge rate from the amount of energy is not limited to this, and may be selected according to the type of amount of energy and the like.

In step S13, the acquisition unit 31 acquires the charging state of the power storage device 10 (acquisition step). The acquisition unit 31 acquires the charging state by receiving data from the power storage device 10. As an example of data indicating the state of charge, SOC (State of Charge) indicating the ratio of the remaining amount to the fully charged capacity can be mentioned. For example, the acquisition unit 31 may acquire the SOC from the power storage device 10 or may acquire the SOC by calculation from the data received from the power storage device 10. The use of SOC is not essential, and the state of charge may be expressed by an index other than SOC.

In step S14, the determination unit 33 determines the discharge rate and discharge time of the power storage device 10 based on the estimated charge rate and the acquired charge state (determination step). In this embodiment, the determination unit 33 determines the discharge rate and the discharge time corresponding to the set of charge rate and charge state with reference to the discharge rate rule 36. In the present embodiment, the discharge rate rule 36 defines a condition for whether or not to discharge the power storage device 10, and a discharge rate and a discharge time when the discharge is executed. The discharge rate rule 36 does not execute discharge if there is a high probability that the power storage device 10 can store electricity even if the amount of power generation suddenly increases, and executes discharge if there is a high probability that the power storage device 10 cannot store the electricity. Is set to.

For example, assume that the memory 102 stores the discharge rate rule 36 shown in FIG. In this discharge rate rule 36, the discharge control is set in four stages according to the combination of the charge rate and the SOC (charge state), and FIG. 4 shows the rule on a map. Step 51 indicates that no discharge is performed. The step 52 indicates that the discharge corresponding to 0.0133% or more and less than 0.0266% of the rated capacity of the storage battery of the power storage device 10 is executed. Step 53 indicates that a discharge corresponding to 0.0266% or more and less than 0.04% of its rated capacity is performed. Step 54 indicates that a discharge corresponding to 0.04% or more of its rated capacity is performed. Assuming that the 10-hour rate (rated capacity) of the storage battery X is 1500 Ah, the charge rate (or discharge rate) 0.1 C corresponds to a current of 150 A, and the charge rate (or discharge rate) 1.0 C corresponds to a current of 1500 A. Equivalent to. In this case, the discharge corresponding to 0.0133% of the rated capacity of the storage battery X may be discharged at a discharge rate of 0.1 C for 5 seconds or at a discharge rate of 0.5 C for 1 second. Therefore, in this case, the determination unit 33 may determine the discharge rate and the discharge time for the storage battery X to be 0.1 C and 5 seconds, respectively, or 0.5 C and 1 second, respectively. Of course, the specific values of the discharge rate and the discharge time are not limited to these.

When executing the discharge (YES in step S15), in step S16, the indicator 34 generates a discharge instruction indicating the determined discharge rate and discharge time, and transmits the discharge instruction to the power storage device 10. (Instruction step). "Transmitting a discharge instruction to the power storage device" means transmitting a discharge instruction to the power storage device 10 or another device corresponding to the power storage device 10 in order to discharge from the power storage device 10. say. In the present embodiment, the instruction unit 34 transmits a discharge instruction to the power converter 20 corresponding to the power storage device 10 via the communication line 40. The discharge instruction includes the IP address of the power converter 20 and data indicating the determined discharge rate and discharge time. The power converter 20 transitions to the discharge mode according to the received discharge instruction, and outputs the electricity in the corresponding power storage device 10 to the DC bus 5.

When the discharge is not executed (NO in step S15), the control controller 30 ends the process for the target power storage device 10 without transmitting the discharge instruction.

When the power storage system 1 includes a plurality of power storage devices 10, the control controller 30 executes the processes after step S12 for all the power storage devices 10 (see step S17).

Specific examples of the processes of steps S11 to S14 are shown. Here, the power generation device 2 is a 1.5 MW wind power generation system (a system in which the rated output at a wind speed of 10 m / s is 1.5 MW), and the rated voltage of the storage battery of the power storage device 10 is 600 V (2 V3000 Ah). It is assumed that the pieces are connected in series). In addition, calculations such as current loss, conversion efficiency, and battery voltage fluctuations shall not be considered at all. When the measuring device 7 detects a wind with a wind speed of 10 m / s, it is estimated that a power generation amount of 1.5 MW is expected and a current of 15000000 (W) / 600 (V) = 2500 (A) flows through the storage battery. NS. Since the rated capacity of the storage battery is 3000 Ah, assuming that a current of 2500 A flows, the charging rate is 2500/3000 ≈ 0.83 (C). The estimation unit 32 estimates the charge rate in this way, for example, with reference to the charge rate rule 35. Subsequently, the determination unit 33 determines the discharge control with reference to the discharge rate rule 36 shown in FIG. In this example, the determination unit 33 determines that the discharge is not executed if the SOC of the storage battery is 30%, and if the SOC is 60%, it corresponds to 0.0133% or more and less than 0.0266% of the rated capacity of the storage battery. It is determined to execute the discharge, and if the SOC is 80%, it is determined to execute the discharge of 0.0266% or more and less than 0.04% of the rated capacity.

The processes of steps S11 to S17 can be executed repeatedly. For example, the series of processes may be executed in response to a change in the amount of renewable energy, or may be executed continuously or periodically.

[program]
The energy storage control program for making the computer function as the control controller 30 includes a program code for making the computer function as an acquisition unit 31, an estimation unit 32, a determination unit 33, and an instruction unit 34. This storage control program may be provided after being fixedly recorded on a tangible recording medium such as a CD-ROM, a DVD-ROM, or a semiconductor memory. Alternatively, the storage control program may be provided via a communication network as a data signal superimposed on a carrier wave. The provided storage control program is stored in, for example, the memory 102. Each of the above functional elements is realized by the processor 101 executing the storage control program in cooperation with the memory 102.

[effect]
As described above, the power storage control device according to one aspect of the present invention is a power storage control device that controls a power storage device that stores electricity generated from renewable energy, and is a power storage control device that controls the amount of energy of the renewable energy and the power storage device. An acquisition unit that acquires the charging state of the power storage device, an estimation unit that estimates the charging rate of the power storage device based on the acquired energy amount, and a power storage device based on the estimated charging rate and the acquired charging state. It is provided with a determination unit for determining the discharge rate of the power storage device and an instruction unit for transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.

The power storage control method according to one aspect of the present invention is a power storage control method executed by a power storage control device that controls a power storage device that stores electricity generated from renewable energy, and is an energy storage amount of renewable energy and storage. An acquisition step for acquiring the charge state of the device, an estimation step for estimating the charge rate of the power storage device based on the acquired energy amount, and storage based on the estimated charge rate and the acquired charge state. It includes a determination step of determining the discharge rate of the device and an instruction step of transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.

The power storage control program according to one aspect of the present invention is a power storage control program that causes a computer to function as a power storage control device that controls a power storage device that stores electricity generated from renewable energy. Based on the acquisition step of acquiring the charge state of the power storage device, the estimation step of estimating the charge rate of the power storage device based on the acquired energy amount, the estimated charge rate, and the acquired charge state, The computer is made to execute a determination step of determining the discharge rate of the power storage device and an instruction step of transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.

In such an aspect, the degree of the amount of current to be stored in the power storage device (charge rate) is estimated, and the discharge from the power storage device is controlled based on the charge rate and the charge state of the power storage device. NS. In this way, by controlling the charging state of the power storage device in preparation for charging that is expected to occur in the near future, it is possible to improve the charging efficiency of the power storage device even when using regenerated energy for which it is difficult to predict fluctuations in the amount of energy. Will be possible.

When the amount of power generation rises sharply, a current exceeding the amount of electricity that the power storage device can accept may flow through the power storage device and reach the upper limit of the charging voltage in a short time (for example, in an instant). In this state, the power storage device is in a constant voltage charging state in which the current is attenuated, and the generated electricity is wasted. By acquiring the energy amount of the renewable energy in advance and discharging the power storage device based on this energy amount, the power storage device can easily receive more electricity. Therefore, the charging efficiency of the power storage device is improved.

In the power storage control device according to the other aspect, the determination unit determines the discharge rate and the discharge time of the power storage device based on the charge rate and the charging state, and the indicator unit determines the discharge rate and the discharge time at the determined discharge rate and the discharge time. You may send a discharge instruction to discharge. By using the discharge rate and the discharge time, the discharge from the power storage device can be controlled more finely.

In the power storage control device according to the other aspect, the indicator unit does not have to transmit the discharge instruction when the charge state is equal to or more than the threshold value and does not transmit the discharge instruction when the charge state is less than the threshold value. If the state of charge is less than the threshold value, it can be expected that the power storage device can sufficiently store electricity from the power generation device without discharging in advance. In such a case, unnecessary discharge can be avoided by not transmitting the discharge instruction.

In the storage control device according to the other aspect, the renewable energy may be wind power. In this case, it is possible to improve the charging efficiency of the power storage device that stores the electricity obtained by the wind power generation.

[Modification example]
The present invention has been described in detail above based on the embodiment. However, the present invention is not limited to the above embodiment. The present invention can be modified in various ways without departing from the gist thereof.

In the above embodiment, the determination unit 33 determines the discharge rate and the discharge time, and the indicator unit 34 transmits a discharge instruction indicating the discharge rate and the discharge time, but the discharge time may be omitted. That is, the power storage control device may transmit a discharge instruction including a discharge rate to the power storage device without determining the discharge time.

The processing procedure of the storage control method executed by at least one processor is not limited to the example in the above embodiment. For example, some of the steps (processes) described above may be omitted, or each step may be executed in a different order. Further, any two or more steps among the above-mentioned steps may be combined, or a part of the steps may be modified or deleted. Alternatively, other steps may be performed in addition to each of the above steps.

When comparing the magnitude relations of two numerical values in the power storage system 1, either of the two criteria of "greater than or equal to" and "greater than" may be used, and the two criteria of "less than or equal to" and "less than" are used. Either of these may be used. The selection of such criteria does not change the technical significance of the process of comparing the magnitude relations of two numbers.

1 ... Power storage system, 2 ... Power generation device, 3 ... PCS, 4 ... Power system, 5 ... DC bus, 6 ... AC bus, 7 ... Measuring device, 8 ... Communication network, 10 ... Power storage device, 20 ... Power converter, 30 ... Control controller (storage control device), 31 ... Acquisition unit, 32 ... Estimate unit, 33 ... Decision unit, 34 ... Indicator unit, 35 ... Charge rate rule, 36 ... Discharge rate rule, 40 ... Communication line.

Claims (6)

A power storage control device that controls a power storage device that stores electricity generated from renewable energy.
An acquisition unit that acquires the amount of energy of the renewable energy and the charging state of the power storage device, and
An estimation unit that estimates the charge rate of the power storage device based on the acquired energy amount, and
A determination unit that determines the discharge rate of the power storage device based on the estimated charge rate and the acquired charge state.
A power storage control device including an instruction unit that transmits a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device. The determination unit determines the discharge rate and discharge time of the power storage device based on the charge rate and the charge state.
The indicator transmits the discharge instruction for discharging the power storage device at the determined discharge rate and the discharge time.
The power storage control device according to claim 1. The indicator transmits the discharge instruction when the charge state is equal to or higher than the threshold value, and does not transmit the discharge instruction when the charge state is less than the threshold value.
The power storage control device according to claim 1 or 2. The renewable energy is wind power,
The power storage control device according to any one of claims 1 to 3. It is a storage control method executed by a power storage control device that controls a power storage device that stores electricity generated from renewable energy.
An acquisition step of acquiring the energy amount of the renewable energy and the charging state of the power storage device, and
An estimation step of estimating the charge rate of the power storage device based on the acquired energy amount, and
A determination step of determining the discharge rate of the power storage device based on the estimated charge rate and the acquired charge state.
A storage control method including an instruction step of transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device. A power storage control program that causes a computer to function as a power storage control device that controls a power storage device that stores electricity generated from renewable energy.
An acquisition step of acquiring the energy amount of the renewable energy and the charging state of the power storage device, and
An estimation step of estimating the charge rate of the power storage device based on the acquired energy amount, and
A determination step of determining the discharge rate of the power storage device based on the estimated charge rate and the acquired charge state.
A storage control program that causes the computer to execute an instruction step of transmitting a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.

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