Power storage control apparatus

Abstract

To provide a power storage control apparatus capable of operating a storage battery in order to increase economical benefit in a facility including a storage battery.SOLUTION: A power storage control apparatus 10 comprises: a reward sum prediction part 12 that predicts, when dischargeable power amount of a storage battery 5 in a prescribed time zone is greater than predicted load power amount of a power load 4 provided in a facility 2 in the prescribed time zone, first predicted reward sum obtained when performing first discharge control of discharging the storage battery 5 at maximum so as to reversely flow power from the facility 2 to the power system 1 and second predicted reward sum obtained when performing second discharge control of discharging the storage battery 5 at maximum so as not to reversely flow power from the facility 2 to the power system 1; and an operation control part 13 that performs first discharge control in the prescribed time zone when the first predicted reward sum is greater than the second predicted reward sum, and second discharge control in the prescribed time zone when then second predicted reward sum is greater than the first predicted reward sum.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electricity storage control device. [Background technology]

[0002] Storage batteries are installed in facilities such as residences and offices that can receive power from the power grid, and the power discharged from the storage batteries is used to supply power to the facility's power load. For example, if electricity rates are set according to time of day, the storage batteries can be operated so that the power received from the power grid is charged into the storage batteries during times when electricity rates are low, and the power discharged from the storage batteries is consumed by the facility's power load during times when electricity rates are high.

[0003] In addition, the storage batteries installed in the facility can be operated in response to a request from the business operator. For example, if the facility receives a request from a general electricity transmission and distribution business operator, a retail electricity business operator, an aggregator, or the like to reduce the amount of power received at the facility's power receiving point, the storage batteries can be operated to discharge in response to the request.

[0004] For example, Patent Document 1 (JP 2017-146761 A) describes a supply and demand adjustment device that can determine the amount of adjusted power and the amount of market procurement through demand response that is economically optimal for the energy supplier, and can also determine the amount of market sales. Thus, Patent Document 1 takes into consideration how to secure the power to be supplied to power consumers in order to maximize the economic benefits of the energy supplier. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-146761 Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 takes into consideration increasing the economic benefits of energy suppliers who supply electricity to electricity consumers, but does not describe how, for example, when an electricity consumer receives a request for demand response and responds to the demand response request at the consumer's facility, the storage batteries installed at the facility should be operated to increase the consumer's economic benefits.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a storage control device that can operate a storage battery in order to increase the economic benefits in the facility where the storage battery is installed. [Means for solving the problem]

[0008] A characteristic configuration of a power storage control device according to the present invention for achieving the above object is a power storage control device that controls operation of a storage battery provided in a facility that can receive power from a power grid, comprising: an information receiving unit that receives request information including a request to reduce a power receiving point amount of power, which is the amount of power at a power receiving point of the facility, during a predetermined time period in the future; a remuneration amount prediction unit that predicts, when the dischargeable energy amount of the storage battery during the specified time period is greater than the predicted load energy amount of the power load installed in the facility during the specified time period, a first predicted remuneration amount that will be obtained when a first discharge control is performed to discharge the maximum amount of power from the storage battery so as to cause a reverse flow of power from the facility to the power grid in order to reduce the power receiving point energy amount during the specified time period in response to the request information, and a second predicted remuneration amount that will be obtained when a second discharge control is performed to discharge the maximum amount of power from the storage battery so as not to cause a reverse flow of power from the facility to the power grid; The device is characterized by having an operation control unit that performs the first discharge control during the specified time period when the first predicted remuneration amount is greater than the second predicted remuneration amount, and performs the second discharge control during the specified time period when the second predicted remuneration amount is greater than the first predicted remuneration amount. Here, the operation control unit may perform the second discharge control during the specified time period if the dischargeable amount of energy of the storage battery during the specified time period is smaller than the predicted load energy of the power load to be installed in the facility during the specified time period.

[0009] According to the above characteristic configuration, by having the operation control unit perform the first discharge control or the second discharge control, the amount of power at the facility's power receiving point during a predetermined future time period can be reduced, thereby contributing to stabilizing the power system, for example, when the power supply and demand in the power system is tight. Furthermore, the operation control unit determines whether to cause the storage battery to perform the first discharge control or the second discharge control based on the first predicted remuneration amount and the second predicted remuneration amount predicted by the remuneration amount prediction unit. In other words, by comparing the first discharge control, which causes a reverse flow of power, with the second discharge control, which does not cause a reverse flow of power, the operation control unit can freely perform the discharge control that provides the greatest economic benefit. Therefore, it is possible to provide a power storage control device that can operate a storage battery to increase economic benefits in a facility where the storage battery is installed.

[0010] Another characteristic configuration of the storage control device of the present invention is that the remuneration amount prediction unit derives the first predicted remuneration amount by multiplying a first remuneration unit price by a predicted amount of reverse flow power during the specified time period predicted when the storage battery is discharged so as to cause a reverse flow of power from the facility to the power grid, and derives the second predicted remuneration amount by multiplying a second remuneration unit price by a predicted amount of discharge power during the specified time period predicted when the storage battery is discharged so as not to cause a reverse flow of power from the facility to the power grid. Here, the first remuneration unit price and the second remuneration unit price may be set separately.

[0011] According to the above characteristic configuration, the first predicted remuneration amount to be obtained when a first discharge control is performed to maximize the discharge from the storage battery so as to cause a reverse flow of power from the facility to the power grid can be derived by multiplying the first remuneration unit price by the predicted amount of reverse flow power in a predetermined time period predicted when the storage battery is discharged to cause a reverse flow of power from the facility to the power grid. Furthermore, the second predicted remuneration amount to be obtained when a second discharge control is performed to maximize the discharge from the storage battery without causing a reverse flow of power from the facility to the power grid can be derived by multiplying the second remuneration unit price by the predicted amount of discharge power in a predetermined time period predicted when the storage battery is discharged without causing a reverse flow of power from the facility to the power grid. Furthermore, even when the first remuneration unit price and the second remuneration unit price are different, the first predicted remuneration amount and the second predicted remuneration amount can be derived.

[0012] Another characteristic feature of the storage control device of the present invention is that the predicted load power amount for the specified time period is the average value of the load power amount for the specified time period for the four days with the largest load power amount of the power load for the same time period as the specified time period out of the last five days in the past.

[0013] According to the above characteristic configuration, the average load power amount for the specified time period for the four days with the highest load power amount for the power load in the same time period as the specified time period out of the most recent five days can be used as the predicted load power amount for the specified time period.

[0014] Another characteristic feature of the storage control device of the present invention is that a lower limit of remaining charge capacity is set in the storage battery, which prohibits further discharge, and the dischargeable amount of power is determined taking into account this lower limit of remaining charge capacity.

[0015] According to the above characteristic configuration, the lower limit remaining charge can be freely set, so that facilities that want to maintain a large amount of remaining charge can set the lower limit remaining charge to a large amount, and facilities that want to discharge a large amount of electricity upon request can set the lower limit remaining charge to a small amount.

[0016] Another characteristic feature of the power storage control device according to the present invention is that the dischargeable amount of power is determined in consideration of the discharge efficiency of the storage battery.

[0017] According to the above characteristic configuration, even if the remaining amount of electricity stored in the storage battery is the same, the amount of electricity discharged varies depending on the discharge power used for discharging. For example, a storage battery exhibits maximum discharge efficiency at its rated discharge power, and the discharge efficiency decreases as the discharge power decreases. Therefore, when the first discharge control is performed, the discharge efficiency is higher than when the second discharge control is performed, and the remaining amount of electricity stored in the storage battery can be effectively utilized. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a system in which a power storage control device is provided. [Figure 2] FIG. 10 is a diagram illustrating a case where the dischargeable energy amount is equal to or less than the predicted load energy amount. [Figure 3] FIG. 10 is a diagram illustrating a case where the dischargeable energy amount is greater than the predicted load energy amount. [Figure 4] FIG. 4 is a diagram illustrating a first discharge control. [Figure 5] FIG. 10 is a diagram illustrating a second discharge control. DETAILED DESCRIPTION OF THE INVENTION

[0019] A power storage control device 10 according to an embodiment of the present invention will be described below with reference to the drawings. 1 is a diagram showing the configuration of a system in which a power storage control device 10 is installed. As shown in the figure, the power storage control device 10 is installed in a facility 2, such as a residence or business office, that can receive power from a power grid 1. In the facility 2, a storage battery 5 and a power load 4 are connected to a power line 3 that is connected to the power grid 1.

[0020] The power load 4 is, for example, a variety of devices such as lighting devices and air conditioners, and can receive power supply from at least one of a storage battery 5 installed in the facility 2 and the power grid 1.

[0021] An upper limit remaining charge capacity beyond which charging is prohibited and a lower limit remaining charge capacity beyond which discharging is prohibited are set for the storage battery 5, and the chargeable energy amount and dischargeable energy amount are determined taking the upper limit remaining charge capacity and the lower limit remaining charge capacity into consideration. Specifically, the amount of energy between the current remaining charge capacity of the storage battery 5 and the upper limit remaining charge capacity is the chargeable energy amount, and the amount of energy between the current remaining charge capacity of the storage battery 5 and the lower limit remaining charge capacity is the dischargeable energy amount. In this way, since the lower limit remaining charge capacity can be freely set, it is possible to set the lower limit remaining charge capacity to a large value in a facility 2 that wishes to maintain a large amount of remaining charge, and to set the lower limit remaining charge capacity to a small value in a facility 2 that wishes to discharge a large amount of power in response to a request.

[0022] Furthermore, the chargeable amount of power may be determined in consideration of the charging efficiency of the storage battery 5, or the dischargeable amount of power may be determined in consideration of the discharging efficiency of the storage battery 5.

[0023] When the facility 2 receives a request from a general electricity transmission and distribution company, an electricity retailer, an aggregator, or the like to reduce the amount of power received at the power receiving point, the facility 2 can operate the storage battery 5 to discharge in response to the request. Such operation of the storage battery 5 is performed under the control of the power storage control device 10.

[0024] The power storage control device 10 includes an information receiving unit 11, a remuneration amount predicting unit 12, and an operation control unit 13. The power storage control device 10 of this embodiment also includes an information storage unit 14 that stores information handled by the power storage control device 10.

[0025] The operation control unit 13 can control the discharge power and charge power of the storage battery 5. Furthermore, the power supplied from the power grid 1 to the facility 2, as measured by the power measurement unit 6, is transmitted to the power storage control device 10. For example, when the power measured by the power measurement unit 6 is a positive value, it indicates that power is being supplied from the power grid 1 to the facility 2, and when the power measured by the power measurement unit 6 is a negative value, it indicates that power is being supplied from the facility 2 to the power grid 1 (i.e., a reverse flow of power to the power grid 1 is occurring).

[0026] The power measured by the power measurement unit 6 represents the total power of the load power of the power load 4 and the charging power of the storage battery 5, or the power obtained by subtracting the discharging power of the storage battery 5 from the load power of the power load 4. Furthermore, the operation control unit 13 of the power storage control device 10 knows the discharging power and charging power of the storage battery 5, and can therefore derive the load power of the power load 4 by referring to the power measured by the power measurement unit 6. The operation control unit 13 can then store information indicating the time transition of the derived load power of the power load 4 in the information storage unit 14.

[0027] The power storage control device 10 can derive the predicted load power amount of the power load 4 for a predetermined time period in the future based on information indicating the temporal change in the load power of the power load 4 in the past, which is stored in the information storage unit 14. For example, the predicted load power amount for the predetermined time period in the future can be determined as the average value of the load power amounts for the power load 4 for the four days with the largest load power amounts for the power load 4 for the same time period as the predetermined time period out of the last five days. The predetermined time period is, for example, any time period of 30 minutes. Note that the method for deriving the predicted load power amount is not limited to the above and can be changed as appropriate.

[0028] The information receiving unit 11 receives request information including a request to reduce the amount of power received at the power receiving point of the facility 2 during a predetermined time period in the future.

[0029] The remuneration prediction unit 12 predicts the remuneration to be obtained when the request information is satisfied by reducing the amount of power received at the power grid 1. In this embodiment, when the dischargeable power amount of the storage battery 5 during a predetermined time period is greater than the predicted load power amount of the power load 4 installed at the facility 2 during the predetermined time period, the remuneration prediction unit 12 predicts a first predicted remuneration to be obtained when a first discharge control is performed to discharge the maximum amount of power from the storage battery 5 so as to cause a reverse power flow from the facility 2 to the power grid 1 in order to reduce the amount of power received at the power grid 1 during the predetermined time period in response to the request information, and a second predicted remuneration to be obtained when a second discharge control is performed to discharge the maximum amount of power from the storage battery 5 so as not to cause a reverse power flow from the facility 2 to the power grid 1.

[0030] Fig. 2 is a diagram showing a case where the dischargeable energy amount in a specified time period is equal to or less than the predicted load energy amount. Fig. 3 is a diagram showing a case where the dischargeable energy amount in a specified time period is greater than the predicted load energy amount. The predicted load energy amount of the power load 4 to be installed in the facility 2 in a future specified time period, which is referred to by the remuneration prediction unit 12, is a value derived using the method described above, and can be derived by, for example, the operation control unit 13 or the remuneration prediction unit 12.

[0031] 2 , when the dischargeable energy amount of the storage battery 5 during a predetermined time period is equal to or less than the predicted load energy amount of the power load 4 installed in the facility 2 during the predetermined time period, it is not possible to make the dischargeable energy amount of the storage battery 5 during the predetermined time period greater than the predicted load energy amount, i.e., it is not possible to perform reverse power flow from the facility 2 to the power grid 1. Therefore, when the dischargeable energy amount of the storage battery 5 during the predetermined time period is equal to or less than the predicted load energy amount of the power load 4 installed in the facility 2 during the predetermined time period, the operation control unit 13 performs second discharge control during the predetermined time period. The second discharge control is control to discharge the maximum amount of energy from the storage battery 5 so as not to cause reverse power flow from the facility 2 to the power grid 1.

[0032] 3, if the dischargeable energy amount of the storage battery 5 during a predetermined time period is greater than the predicted load energy amount of the power load 4 installed in the facility 2 during that time period, the discharge energy amount of the storage battery 5 during that time period can be made greater than the predicted load energy amount, or the discharge energy amount of the storage battery 5 during that time period can be made equal to or less than the predicted load energy amount. Therefore, in this embodiment, the first predicted remuneration amount and the second predicted remuneration amount predicted by the remuneration amount prediction unit 12 are referenced to determine how to discharge the storage battery 5.

[0033] FIG. 4 is a diagram illustrating the first discharge control. In the first discharge control, as shown in the figure, the storage battery 5 is discharged to the maximum extent possible so as to cause a reverse flow of power from the facility 2 to the power grid 1 in order to reduce the amount of power received at the power receiving point during a predetermined time period. For example, an amount of power greater than the predicted load power amount during the predetermined time period is discharged from the storage battery 5. Therefore, as shown in FIG. 4, the predicted amount of discharged power during the predetermined time period is the dischargeable power amount, and the value obtained by subtracting the predicted load power amount from the predicted amount of discharged power is the predicted amount of reverse flow power. The remuneration amount prediction unit 12 then derives the first predicted remuneration amount by multiplying the first remuneration unit price by the predicted amount of reverse flow power during the predetermined time period predicted when the storage battery 5 is discharged to cause a reverse flow of power from the facility 2 to the power grid 1. This first remuneration unit price is, for example, a value stored in the information storage unit 14.

[0034] FIG. 5 is a diagram illustrating the second discharge control. In the second discharge control, as shown in the figure, the storage battery 5 is discharged to the maximum extent possible so as not to cause a reverse flow of power from the facility 2 to the power grid 1. Therefore, the predicted amount of discharged power in a predetermined time period is equal to the predicted load power amount. The remuneration amount prediction unit 12 then derives the second predicted remuneration amount by multiplying the second remuneration unit price by the predicted amount of discharged power in a predetermined time period predicted when the storage battery 5 is discharged so as not to cause a reverse flow of power from the facility 2 to the power grid 1. This second remuneration unit price is, for example, a value stored in the information storage unit 14.

[0035] The first remuneration unit price and the second remuneration unit price are values ​​that are set separately, and may be the same value as each other or may be different values ​​from each other.

[0036] Then, the operation control unit 13 performs first discharge control during a specified time period when the first predicted remuneration amount predicted by the remuneration amount prediction unit 12 is greater than the second predicted remuneration amount, and performs second discharge control during a specified time period when the second predicted remuneration amount is greater than the first predicted remuneration amount (in this embodiment, when the second predicted remuneration amount is greater than or equal to the first predicted remuneration amount).

[0037] As described above, by the operation control unit 13 performing the first discharge control or the second discharge control, the amount of power at the receiving point of the facility 2 during a predetermined future time period can be reduced, thereby contributing to the stabilization of the power system 1, for example, when the power supply and demand in the power system 1 is tight. Furthermore, the operation control unit 13 determines whether to cause the storage battery 5 to perform the first discharge control or the second discharge control based on the first predicted remuneration amount and the second predicted remuneration amount predicted by the remuneration amount prediction unit 12. In other words, by comparing the first discharge control, which causes a reverse flow of power, with the second discharge control, which does not cause a reverse flow of power, the discharge control that results in the greatest economic benefit can be freely performed. Therefore, it is possible to provide a storage control device 10 that can operate the storage battery 5 to maximize the economic benefit of the facility 2 in which the storage battery 5 is installed.

[0038] <Another embodiment> In the above embodiment, a specific example of the configuration of the power storage control device 10 has been described, but the configuration is not limited to that described in the above embodiment and can be modified as appropriate.

[0039] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0040] INDUSTRIAL APPLICABILITY The present invention can be used in a power storage control device that can operate a storage battery to increase economic benefits in a facility where the storage battery is installed. [Explanation of symbols]

[0041] 1 Power system 2 Facilities 3. Power Lines 4 Power load 5. Storage battery 6 Power measurement section 10. Storage control device 11 Information Reception Department 12 Remuneration Forecasting Department 13 Operation control section 14 Information storage section

Claims

1. A power storage control device that controls the operation of a storage battery installed in a facility that can receive power from a power grid, an information receiving unit that receives request information including a request to reduce a power receiving point amount of power, which is the amount of power at a power receiving point of the facility, during a predetermined time period in the future; a remuneration amount prediction unit that predicts, when the dischargeable energy amount of the storage battery during the specified time period is greater than the predicted load energy amount of the power load installed in the facility during the specified time period, a first predicted remuneration amount that will be obtained when a first discharge control is performed to discharge the maximum amount of power from the storage battery so as to cause a reverse flow of power from the facility to the power grid in order to reduce the power receiving point energy amount during the specified time period in response to the request information, and a second predicted remuneration amount that will be obtained when a second discharge control is performed to discharge the maximum amount of power from the storage battery so as not to cause a reverse flow of power from the facility to the power grid; An operation control unit that performs the first discharge control during the specified time period when the first predicted remuneration amount is greater than the second predicted remuneration amount, and performs the second discharge control during the specified time period when the second predicted remuneration amount is greater than the first predicted remuneration amount.

2. 2. The power storage control device according to claim 1, wherein the operation control unit performs the second discharge control during the predetermined time period when the dischargeable amount of power of the storage battery during the predetermined time period is smaller than the predicted load power amount of the power load installed in the facility during the predetermined time period.

3. The remuneration amount prediction unit deriving the first predicted remuneration amount by multiplying a first remuneration unit price by a predicted amount of reverse flow power in the predetermined time period predicted when discharging from the storage battery so as to cause a reverse flow of power from the facility to the power grid; 3. The energy storage control device according to claim 1, wherein the second predicted remuneration amount is derived by multiplying the second remuneration unit price by the predicted amount of discharged electricity during the specified time period when discharging electricity from the storage battery without causing reverse power flow from the facility to the power grid.

4. The power storage control device according to claim 3 , wherein the first remuneration unit price and the second remuneration unit price are set separately.

5. 3. The power storage control device according to claim 1, wherein the predicted load power amount for the specified time period is an average value of the load power amounts for the specified time period for four days with the largest load power amounts of the power load in the same time period as the specified time period out of the most recent five days.

6. 3. The power storage control device according to claim 1, wherein a lower limit of remaining charge is set in the storage battery, beyond which further discharge is prohibited, and the dischargeable amount of power is determined taking into consideration the lower limit of remaining charge.

7. The power storage control device according to claim 1 or 2, wherein the dischargeable amount of power is determined in consideration of the discharge efficiency of the storage battery.

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