JP2019092339A - Power storage control device, power storage control method, and power storage control program - Google Patents

Abstract

To improve charging efficiency of a power storage device even when using regenerated energy whose fluctuation of energy amount is hard to predict.SOLUTION: The power storage control device controls a power storage device that stores electricity generated from renewable energy. The power storage control device includes: an acquisition unit that acquires an energy amount of renewable energy and a charge state of the power storage device; an estimation unit that estimates a charging rate of the power storage device on the basis of the acquired energy amount; a determination unit that determines a discharge rate of the power storage device on the basis of the estimated charge rate and the acquired charge state; and an instruction unit that transmits a discharge instruction for discharging the power storage device at the determined discharge rate to the power storage device.SELECTED DRAWING: Figure 2

Description

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

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

Patent No. 5447282 gazette

  Since the amount of electricity generated by the power generation device using renewable energy and stored in the power storage device can also depend on the size of the renewable energy, the state of power generation is also taken into consideration to improve the charging efficiency of the power storage device Is desirable. However, some renewable energy, such as, for example, wind power, has unpredictable or very difficult prediction of the amount of energy. Therefore, it is desired to improve the charging efficiency of the power storage device even in the case of using regenerated energy whose fluctuation of the energy amount is hard to predict.

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

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

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

  In such an aspect, the degree (the charging rate) of the amount of current to be stored in the storage device is estimated, and the discharge from the storage device is controlled based on the charging rate and the charging state of the storage device. Ru. As described above, by controlling the state of charge of the power storage device in preparation for charging expected to occur in the near future, the charging efficiency of the power storage device can be improved even in the case of using regenerated energy whose fluctuation of the energy amount is difficult to predict. Becomes possible.

  According to one aspect of the present invention, the charging efficiency of the power storage device can be improved even in the case of using regenerated energy whose fluctuation of the energy amount is hard to predict.

It is a figure which shows typically an example of a structure of a storage system and its periphery. It is a figure which shows the function structure of the integrated controller (electric storage control apparatus) which concerns on embodiment. It is a flowchart which shows operation | movement of the integrated controller (electric storage control apparatus) which concerns on embodiment. It is a figure which shows the example of a discharge rate rule.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference symbols, without redundant description.

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

  Before describing the storage control device, an overview of a power system including the storage system 1 will be described. FIG. 1 is a diagram schematically showing an example of a configuration of power storage system 1 and the periphery thereof. The storage system 1 is provided between the power generation device 2 and the power system 4. The DC system including the storage system 1 and the power generation device 2 and the AC system including the power system 4 are electrically connected via the PCS (power conditioning system) 3. Storage system 1, power generation device 2, and PCS 3 are electrically connected via direct current (DC) bus 5 through which direct current flows. Power system 4 and 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 storage system 1 is supplied to the power system 4. Power sale is an example of supply of electricity to the power system 4. The storage system 1 also plays a role of alleviating fluctuations in the power supply from the power generation device 2 to the power system 4 by utilizing the storage battery as a cushion.

  The power generation device 2 is a device that generates power using renewable energy. An example of the regenerated energy whose fluctuation of the amount of energy is hard to predict is wind power, and thus, an example of the power generation device 2 is a wind power generator. However, the power generation method and the type of the power generation device 2 are not limited at all, and a power generation device using other renewable energy may be used.

  The power system 4 is a facility of commercial power that integrates power generation, transformation, transmission, and distribution, and is provided by, for example, a power company.

  The PCS 3 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 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 storage system 1. The type and configuration of the measuring device 7 depend 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, and acquires, for example, the wind speed (m / s) or the amount of air (unit: m ³ / min (CMM)) as the amount of energy . Examples of the measurement device 7 for wind power include a wind cup anemometer, a wind turbine anemometer, and an ultrasonic anemometer.

  The storage system 1 includes a storage device 10, a power converter 20, and a general controller 30. One power storage device 10 corresponds to one power converter 20, and these two devices are electrically connected via a DC bus. A pair of corresponding storage device 10 and power converter 20 can also be referred to as a storage unit. In the example of FIG. 1, the storage system 1 includes three sets of storage devices 10 and power converters 20 (three storage units), but the number of sets is not limited, and may be one or two or four or more. When a plurality of power storage units exist, the performance of power storage device 10 (for example, rated capacity, response speed, etc.) and the performance of power converter 20 (for example, rated output, response speed, etc.) may be unified. It does not have to be unified. The integrated controller 30 is communicably connected to each power storage device 10 and each power converter 20 via the 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. Power storage device 10 can also be used to reduce (level) fluctuations in DC power generated by power generation device 2. As an example of the power storage device 10, a storage battery such as a lead storage battery can be mentioned. The storage device 10 includes a control function such as a battery control unit (BCU), and can transmit data related to the storage device 10 to the general controller 30 by this control function.

  Power converter 20 is a device that controls charging and discharging of power storage device 10. Power converter 20 receives an instruction signal (data signal) from integrated controller 30 and controls charging / discharging of power storage device 10 based on the instruction signal. Power converter 20 stores the electricity flowing from power generation device 2 in power storage device 10 in the charge mode, discharges power storage device 10 in the discharge mode to supply power to the outside, and performs charge / discharge in the stopped state. Absent. Power converter 20 may be, for example, a DC / DC converter.

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

  One of the features of the storage system 1 is discharge control for increasing the charging efficiency of the storage device 10, and this feature is particularly realized by the general controller 30. In the present embodiment, the storage control device according to the present invention is applied to the general controller 30. Hereinafter, the function and configuration of the general controller 30 related to 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 energy amount of the renewable energy and the charge state of the power storage device 10. Estimator 32 is a functional element that estimates the charge rate of power storage device 10 based on the amount of energy. Determination unit 33 is a functional element that determines at least the discharge rate of power storage device 10 based on the charge rate and the charge state. Instruction unit 34 is a functional element that transmits a discharge instruction toward 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 charge amount per unit time, and the discharge rate is the discharge amount per unit time (generally per hour). Assuming that the current to be charged or discharged is I (A) and the battery capacity is C (Ah), both the charge rate and the discharge rate are represented by I / C, and the unit is "C". For example, 1C represents the amount of current that charges or discharges the total capacity of the battery in one hour, 0.1C represents the amount of current that charges or discharges the entire capacity of the battery in 10 hours, and 2C represents the total amount of battery in zero hours .5 represents the amount of current 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 measurement 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 storage device 10. The description method of these rules is not limited. For example, the charge rate rule 35 and the discharge rate rule 36 may be represented by any one of a formula, an algorithm, and a correspondence table, or may be represented by any two or more combinations of a formula, an algorithm, and a correspondence table. It is also good. Alternatively, these rules may be part of a program executed by the 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 storage device 10, or the power converter 20 is added, replaced, or removed, the administrator can change the charge rate rule 35 or the discharge rate rule in the memory 102 according to the change of the configuration. Rewrite 36 In this case, the administrator accesses the general controller 30 with a management computer (not shown) via a predetermined communication network (not shown), and a new charge rate rule 35 or a discharge rate reflecting a change in configuration The rule 36 may be transferred to the general controller 30. By this transfer, the charge rate rule 35 and the discharge rate rule 36 in the memory 102 are rewritten.

  The communication interface 103 cooperates with the processor 101 to execute transmission and reception of 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 transmits a discharge instruction to the power converter 20 in cooperation with the instruction unit 34.

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

  In step S11, the acquisition unit 31 acquires the amount of renewable energy (acquisition step). The acquiring unit 31 receives the data transmitted from the measuring device 7 to acquire the energy amount.

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

  In step S13, the acquisition unit 31 acquires the charge state of the power storage device 10 (acquisition step). Acquisition unit 31 receives data from power storage device 10 to acquire a charge state. As an example of data indicating the charge state, there is an SOC (State of Charge) indicating the ratio of the remaining amount to the full charge capacity. For example, the acquiring unit 31 may acquire the SOC from the power storage device 10, or may acquire the SOC by calculation from data received from the power storage device 10. The use of the SOC is not essential, and the state of charge may be expressed by an indicator other than the SOC.

  In step S14, the discharge rate and discharge time of the power storage device 10 are determined based on the estimated charge rate and the acquired charge state (determination step). In the present embodiment, the determination unit 33 refers to the discharge rate rule 36 to determine the discharge rate and the discharge time corresponding to the combination of the charge rate and the charge state. In the present embodiment, the discharge rate rule 36 defines the condition as to whether or not the power storage device 10 is to be discharged, and the discharge rate and the discharge time when the discharge is performed. The discharge rate rule 36 does not execute discharge if the probability that the power storage device 10 can store electricity is high even if the amount of power generation rises sharply, and performs discharge if the probability that the power storage device 10 can not store that electricity is high Is set to

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

  When discharging is to be performed (YES in step S15), in step S16, instructing unit 34 generates a discharge instruction indicating the determined discharge rate and discharge time, and transmits the discharge instruction to power storage device 10 (Instruction step). “Transmit a discharge instruction to the storage device” means to transmit the discharge instruction to the storage device 10 or to another device corresponding to the storage device 10 in order to cause the storage device 10 to discharge. Say. In the present embodiment, instruction unit 34 transmits a discharge instruction to power converter 20 corresponding to power storage device 10 via communication line 40. The discharge instruction includes the IP address of power converter 20 and data indicating the determined discharge rate and discharge time. Power converter 20 transitions to the discharge mode in accordance with the received discharge instruction, and outputs the electricity in corresponding power storage device 10 to DC bus 5.

  If discharge is not to be performed (NO in step S15), integrated controller 30 ends the process for target power storage device 10 without transmitting a discharge instruction.

  In the case where the storage system 1 includes a plurality of storage devices 10, the general controller 30 executes the processing of step S12 and subsequent steps for all the storage devices 10 (see step S17).

  The specific example of a process of step S11-S14 is shown. Here, the power generation device 2 is a 1.5 MW wind power generation system (a system whose rated output at a wind speed of 10 m / s is 1.5 MW), and the rated voltage of the storage battery of the storage device 10 is 600 V (300 V of a cell of 2 V 3000 Ah). It is assumed that it is in series connection). In addition, calculations such as current loss, conversion efficiency, and fluctuations in battery voltage are not considered at all. When the measuring device 7 detects a wind with a wind speed of 10 m / s, a power generation of 1.5 MW is expected, and it is estimated that a current of 1.500000 (W) / 600 (V) = 2500 (A) flows in the storage battery Ru. Since the rated capacity of the storage battery is 3000 Ah, if a current of 2500 A flows, the charge rate is 2500/3000 0.8 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 discharge control with reference to the discharge rate rule 36 illustrated in FIG. 4. In this example, the determination unit 33 determines that discharging is not performed if the SOC of the storage battery is 30%, and corresponds to 0.0133% or more and less than 0.0266% of the rated capacity of the storage battery if the SOC is 60%. It is determined that the discharge is to be performed, and if the SOC is 80%, it is determined that the discharge of 0.0266% or more and less than 0.04% of the rated capacity is to be performed.

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

[program]
The storage control program for causing the computer to function as the general controller 30 includes program codes for causing the computer to function as the acquisition unit 31, the estimation unit 32, the determination unit 33, and the instruction unit 34. The storage control program may be provided while being fixedly recorded on a tangible recording medium such as a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. 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, for example, in the memory 102. The processor 101 executes the storage control program in cooperation with the memory 102 to realize the above-described functional elements.

[effect]
As described above, the power storage control device according to one aspect of the present invention is a power storage control device for controlling a power storage device that stores electricity generated from renewable energy, and includes the amount of energy of renewable energy, the power storage device A storage unit for acquiring the charge state of the battery, an estimation unit for estimating the charge rate of the storage device based on the acquired energy amount, the estimated charge rate, and the acquired charge state. And an instruction unit for transmitting to the power storage device a discharge instruction for discharging the power storage device at the determined discharge rate.

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

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

  In such an aspect, the degree (the charging rate) of the amount of current to be stored in the storage device is estimated, and the discharge from the storage device is controlled based on the charging rate and the charging state of the storage device. Ru. As described above, by controlling the state of charge of the power storage device in preparation for charging expected to occur in the near future, the charging efficiency of the power storage device can be improved even in the case of using regenerated energy whose fluctuation of the energy amount is difficult to predict. Becomes possible.

  When the amount of power generation rises sharply, a current exceeding the amount of electricity that can be received by the power storage device may flow to the power storage device and reach the upper limit value of the charging voltage in a short time (for example, in a moment). In this state, the power storage device is in a constant voltage charging state in which the current attenuates, 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 storage control device according to the other aspect, the determination unit determines the discharge rate and the discharge time of the storage device based on the charge rate and the charge state, and the instruction unit determines the storage device at the determined discharge rate and discharge time. A discharge instruction may be sent to discharge the The discharge from the power storage device can be more finely controlled by using the discharge rate and the discharge time.

  In the storage control device according to another aspect, the instruction unit may transmit the discharge instruction when the charge state is equal to or higher than the threshold, and may not transmit the discharge instruction when the charge state is less than the threshold. If the state of charge is less than the threshold value, the storage device can be expected to sufficiently store electricity from the power generation device without being discharged in advance. In such a case, unnecessary discharge can be avoided by not transmitting the discharge instruction.

  In the storage control device according to another aspect, the renewable energy may be wind power. In this case, the charging efficiency of the power storage device that stores the electricity obtained by wind power generation can be improved.

[Modification]
The present invention has been described above in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the scope of the invention.

  In the above embodiment, the determination unit 33 determines the discharge rate and the discharge time, and the instruction unit 34 transmits the discharge instruction indicating the discharge rate and the discharge time, but the discharge time may be omitted. That is, the storage control apparatus may transmit a discharge instruction including the discharge rate to the 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 the steps may be performed in another order. Also, any two or more of the steps described above may be combined, or some of the steps may be modified or deleted. Alternatively, other steps may be performed in addition to the above steps.

  When comparing the magnitude relationship between two numerical values in the storage system 1, either of two criteria of "above" and "greater than" may be used, and the two criteria of "below" and "below" are used. Either of these may be used. The choice of such criteria does not change the technical significance of the process of comparing the magnitude of the two numbers.

  DESCRIPTION OF SYMBOLS 1 ... Storage system, 2 ... Power generation device, 3 ... PCS, 4 ... Power system, 5 ... DC bus, 6 ... AC bus, 7 ... Measurement device, 8 ... Communication network, 10 ... Storage device, 20 .. Power converter, 30: general controller (storage control device) 31: acquisition unit 32: estimation unit 33: determination unit 34: instruction unit 35: charge rate rule 36: discharge rate rule 40: communication line

Claims (6)

A storage control device for controlling a storage device for storing electricity generated from renewable energy, comprising:
An acquisition unit configured to acquire the energy amount of the renewable energy and the charge state of the power storage device;
An estimation unit configured to estimate a charging rate of the power storage device based on the acquired energy amount;
A determination unit that determines a discharge rate of the power storage device based on the estimated charge rate and the acquired charge state;
And a command unit for transmitting 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 instruction unit transmits the discharge instruction to discharge the power storage device at the determined discharge rate and the discharge time.
The storage control device according to claim 1. The instruction unit transmits the discharge instruction when the charge state is equal to or higher than a threshold, and does not transmit the discharge instruction when the charge state is less than the threshold.
The storage control device according to claim 1. The renewable energy is wind power,
The storage control device according to any one of claims 1 to 3. A storage control method that is executed by a storage control device that controls a storage device that stores electricity generated from renewable energy, comprising:
An acquiring step of acquiring an energy amount of the renewable energy and a charging state of the power storage device;
Estimating the charging rate of the power storage device based on the acquired amount of energy;
A determination step of determining a discharge rate of the power storage device based on the estimated charge rate and the acquired charge state;
And D. 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 storage control program that causes a computer to function as a storage control device that controls a storage device that stores electricity generated from renewable energy.
An acquiring step of acquiring an energy amount of the renewable energy and a charging state of the power storage device;
Estimating the charging rate of the power storage device based on the acquired amount of energy;
A determination step of determining a 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 to the storage device a discharge instruction for discharging the storage device at the determined discharge rate.

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