Storage battery management device

Abstract

To provide a storage battery management device that can find ways to operate storage batteries to maximize economic benefits.SOLUTION: A storage battery management device 20 includes a reward amount prediction unit 22 that derives a first predicted reward amount predicted to be obtained as a reward for reducing an amount of power at a receiving point when first discharge control is performed over a specified period, and a second predicted reward amount predicted to be obtained as a reward for reducing the amount of power at the receiving point when second discharge control is performed over a specified period. The first discharge control is control that discharges the maximum amount of power from a storage battery 11 so as to cause a reverse flow of power when a dischargeable amount of power from the storage battery 11 is greater than a load amount of power of a power load, and the second discharge control is control that discharges the maximum amount of power from the storage battery 11 so as not to cause a reverse flow of power when the dischargeable amount of power from the storage battery 11 is greater than the load amount of power of the power load.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a storage battery management 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 does not describe, for example, how a power consumer who has received a demand response request can operate the storage battery installed at the facility to increase the consumer's economic benefits when the consumer responds to the demand response request at the consumer's facility.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a battery management device that can find a method of operating a battery to maximize economic benefits. [Means for solving the problem]

[0008] The battery management device according to the present invention, which is intended to achieve the above object, has a characteristic configuration including an information acquisition unit that acquires load power data indicating the time transition of the load power of the power load over a predetermined period in a facility where a power load and a storage battery are connected to an electric power system, remaining power storage data indicating the time transition of the remaining power storage amount of the storage battery over the predetermined period when the storage battery is charged and discharged under predetermined charge and discharge conditions, and reduction request data that specifies one or more unit time periods among a plurality of unit time periods that make up the predetermined period, during which a request is made to reduce the power receiving point power amount, which is the amount of power at the power receiving point of the facility; a remuneration amount prediction unit that derives a first predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power receiving point electric power when a first discharge control is performed during the predetermined period, and a second predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power receiving point electric power when a second discharge control is performed during the predetermined period, the first discharge control is control 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 amount of power at the power receiving point in the unit time period specified in the reduction request data, when the amount of power that can be discharged from the storage battery determined based on the remaining power storage data in the unit time period is greater than the load power amount of the power load in the unit time period determined based on the load power data, and 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 in order to reduce the amount of power that can be discharged from the storage battery in the unit time period, when the amount of power that can be discharged from the storage battery in the unit time period is equal to or less than the load power amount of the power load in the unit time period, The second discharge control is a control that, when the dischargeable amount of power of the storage battery during the unit time period specified in the reduction request data is greater than the load amount of power of the power load during that unit time period, discharges 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 system in order to reduce the power receiving point power amount during that unit time period, and, when the dischargeable amount of power of the storage battery during that unit time period is equal to or less than the load amount of power of the power load during that unit time period, discharges 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 system.

[0009] According to the above characteristic configuration, the battery management device can derive a first predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power at the power receiving point when the first discharge control is performed for a predetermined period, and a second predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power at the power receiving point when the second discharge control is performed for a predetermined period. As a result, it is possible to clarify whether a greater economic benefit will be obtained in a facility by performing the first discharge control, which maximizes the discharge from the storage battery so as to cause a reverse power flow from the facility to the power grid, or by performing the second discharge control, which maximizes the discharge from the storage battery so as not to cause a reverse power flow from the facility to the power grid. Therefore, it is possible to provide a storage battery management device that can find a method of operating a storage battery to maximize economic benefits.

[0010] Another characteristic configuration of the battery management device of the present invention is that it is equipped with an information output unit that outputs the first predicted remuneration amount and the second predicted remuneration amount predicted by the remuneration amount prediction unit to users of the facility.

[0011] According to the above characteristic configuration, facility users can recognize whether performing the first discharge control or the second discharge control will result in greater economic benefits at the facility.

[0012] Another characteristic configuration of the battery management device of the present invention is that the remuneration amount prediction unit derives the first predicted remuneration amount by multiplying the first remuneration unit price by the amount of reverse flow power that would occur if power were allowed to flow backward from the facility to the power grid during the unit time period specified in the reduction request data, and derives the second predicted remuneration amount by multiplying the second remuneration unit price by the amount of discharged power that would occur if power were discharged from the battery so as not to flow backward from the facility to the power grid during the unit time period specified in the reduction request data. Here, the first remuneration unit price and the second remuneration unit price may be set separately.

[0013] According to the above characteristic configuration, the first predicted remuneration amount to be obtained when 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 can be derived by multiplying the first remuneration unit price by the amount of reverse flow power when power is allowed to flow reversely from the facility to the power grid during the unit time period specified by the reduction request data. Furthermore, the second predicted remuneration amount to be obtained when second discharge control is performed to discharge the maximum amount of power 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 amount of discharge power when power is discharged from the storage battery without causing a reverse flow of power from the facility to the power grid during the unit time period specified by the reduction request data. 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.

[0014] Another characteristic feature of the battery management device of the present invention is that the load power amount for the unit time period is the average value of the load power amount for the same time period as the unit time period for the four days with the largest load power amount for the same time period as the unit time period out of the last five days in the past.

[0015] According to the above characteristic configuration, the load power amount for a unit time period can be determined as the average load power amount for the four days with the highest load power amount for the power load in the same time period as the unit time period out of the most recent five days.

[0016] Another characteristic feature of the battery management device of the present invention is that the battery is set with an upper limit on the remaining charge capacity that prohibits further charging and a lower limit on the remaining charge capacity that prohibits further discharging, and the dischargeable amount of power is determined taking into account the upper limit on the remaining charge capacity and the lower limit on the remaining charge capacity.

[0017] 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.

[0018] Another characteristic feature of the battery management device according to the present invention is that the dischargeable amount of power is determined in consideration of the discharge efficiency of the battery.

[0019] 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]

[0020] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a system in which a battery management device is provided. [Figure 2]FIG. 10 is a diagram illustrating a case where the amount of dischargeable power is equal to or less than the amount of load power. [Figure 3] FIG. 10 is a diagram illustrating a case where the amount of dischargeable power is greater than the amount of load power. [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

[0021] A battery management device 20 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 battery management device 20 is installed. As shown in the figure, the battery management device 20 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 power storage device 10 and a power load 4 are connected to a power line 3 that is connected to the power grid 1.

[0022] As will be described in detail later, the battery management device 20 of this embodiment can determine how to operate the storage battery 11 during a predetermined past period (i.e., whether to perform the first discharge control or the second discharge control described below) based on the temporal change in the load power of the power load 4 at the facility 2 over a predetermined period, such as the past year, and the temporal change in the remaining amount of power stored in the storage battery 11 over that same period. If it is assumed that the future temporal change in the load power of the power load 4 at the facility 2 shows a similar trend to the past temporal change in the load power, it can be estimated whether operating the storage battery 11 using the operation method (first discharge control or second discharge control) determined as described above will result in a large economic benefit over a predetermined future period. In this way, the battery management device 20 can be used to propose future operation methods for the storage battery 11 to users of the facility 2.

[0023] In this embodiment, the change over time in the load power of the power load 4 over a predetermined period may be the change over time in the actual load power over the past year, for example, as described above, or the change over time in the load power predicted for the future year, for example.

[0024] 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 the power storage device 10 installed in the facility 2 and the power grid 1.

[0025] The energy storage device 10 includes a storage battery 11, an operation control unit 12 that controls the charging and discharging operations of the storage battery 11, and a memory unit 13 that stores information handled by the storage battery 10. An upper limit remaining charge amount beyond which charging is prohibited and a lower limit remaining charge amount beyond which discharging is prohibited are set for the storage battery 11, and the chargeable energy amount and the dischargeable energy amount are determined taking the upper limit remaining charge amount and the lower limit remaining charge amount into consideration. Specifically, the amount of energy between the current remaining charge amount and the upper limit remaining charge amount of the storage battery 11 is the chargeable energy amount, and the amount of energy between the current remaining charge amount and the lower limit remaining charge amount of the storage battery 11 is the dischargeable energy amount. In this way, because the lower limit remaining charge amount can be freely set, it is possible to set the lower limit remaining charge amount to a large amount in a facility 2 that wants to maintain a large amount of remaining charge, and to set the lower limit remaining charge amount to a small amount in a facility 2 that wants to discharge a large amount of power in response to a request.

[0026] Furthermore, the chargeable energy amount may be determined in consideration of the charging efficiency of the storage battery 11, or the dischargeable energy amount may be determined in consideration of the discharging efficiency of the storage battery 11.

[0027] The operation control unit 12 can control the discharge power and charge power of the storage battery 11. 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 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).

[0028] The power measured by the power measurement unit 6 represents the sum of the load power of the power load 4 and the charging power of the storage battery 11, or the power obtained by subtracting the discharging power of the storage battery 11 from the load power of the power load 4. Furthermore, since the operation control unit 12 knows the discharging power and charging power of the storage battery 11, it can 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 12 can then store information indicating the derived change over time in the load power of the power load 4 in the storage unit 13. The operation control unit 12 then transmits load power data indicating the change over time in the load power of the power load 4 for a predetermined past period to the battery management device 20, which will be described later.

[0029] When facility 2 receives a request from a general electricity transmission and distribution utility, a retail electricity utility, an aggregator, or the like to reduce the amount of power received at the power receiving point, facility 2 can operate power storage device 10 to discharge power in response to the request. For example, when facility 2 receives a request to reduce the amount of power received at the power receiving point of facility 2 during a predetermined unit time period in the future, facility 2 can comply with the request by discharging power from power storage device 10 during that unit time period. The unit time period is, for example, any time period of 30 minutes.

[0030] When responding to a request to reduce the amount of power received at the power receiving point, the power storage device 10 of the facility 2 can perform either the first discharge control or the second discharge control, but it is necessary to determine in advance which discharge control to perform. Therefore, it is preferable to be able to predict in advance whether the first discharge control or the second discharge control is the discharge control that can operate the storage battery 11 so as to maximize economic benefits. The storage battery management device 20 of this embodiment can be used to find a method of operating the storage battery 11 to maximize economic benefits.

[0031] The battery management device 20 is connected to the power storage device 10 provided in the facility 2 via an information communication line 7 so as to be able to communicate information. For example, the battery management device 20 is realized using a server. The battery management device 20 of this embodiment includes an information acquisition unit 21, a remuneration amount prediction unit 22, an information output unit 23, and an information storage unit 24.

[0032] The information acquisition unit 21 acquires load power data, remaining power storage amount data, and reduction request data.

[0033] The load power data is data that indicates the temporal change in the load power of the power load 4 for a predetermined period, such as the past year, at the facility 2 in which the power load 4 and the storage battery 11 are connected to the power grid 1. In other words, the load power data is data that indicates the value of the load power of the power load 4 of the facility 2 over the past predetermined period. For example, the load power data is data that is transmitted from the facility 2 to the storage battery management device 20 and stored in the information storage unit 24, and the information acquisition unit 21 can acquire this data. By referring to this load power data, the amount of load power of the power load 4 for each of multiple unit time slots that make up the predetermined period can be derived.

[0034] The remaining power storage data is data that indicates the temporal transition of the remaining power storage amount of the storage battery 11 for a predetermined period when the storage battery 11 is charged and discharged under predetermined charge and discharge conditions. For example, the remaining power storage data is data that indicates the temporal transition of the remaining power storage amount predicted when the storage battery 11 is charged and discharged under predetermined charge and discharge conditions from a predetermined initial remaining power storage amount while the load power of the power load 4 for a predetermined period in the past year in the facility 2 shows the temporal transition similar to the load power data described above. An example of the charge and discharge conditions is a condition that divides a day into a charging time period, such as a time period when electricity rates are low, and a discharging time period, such as a time period when electricity rates are high, and charges the storage battery 11 with power received from the power grid 1 during the charging time period, and discharges the power from the storage battery 11 during the discharging time period so as to cover the load power of the power load 4. Note that the above-mentioned upper limit remaining power storage amount, lower limit remaining power storage amount, charging efficiency, and discharging efficiency may be included as the charge and discharge conditions. Therefore, based on the load power data and freely set charging and discharging conditions, it is possible to predict how the remaining amount of stored power in the storage battery 11 will change over time for a predetermined period of time. For example, the remaining amount of stored power data is derived by the storage battery management device 20 and stored in the information storage unit 24, and the information acquisition unit 21 can acquire this data.

[0035] Then, by referring to the load power data and the remaining stored power data, it is possible to know how the load power amount and the remaining stored power amount of the facility 2 change over time for each unit time period during a predetermined period.

[0036] The reduction request data is data that specifies one or more unit time periods, among a plurality of unit time periods that make up a predetermined period, for which a request is made to reduce the power receiving point power amount, which is the amount of power at the power receiving point of the facility 2. In this case, the request may be a request that was actually made to the facility 2 in the past during the predetermined period, or may be a virtual request. For example, the reduction request data is data stored in the information storage unit 24, and the information acquisition unit 21 can acquire this data.

[0037] The remuneration amount prediction unit 22 predicts the remuneration amount to be obtained when the facility 2 complies with the request information by reducing the amount of power receiving point power from the power grid 1. In this embodiment, the remuneration amount prediction unit 22 derives a first predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power receiving point power when a first discharge control is performed for a predetermined period, and a second predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power receiving point power when a second discharge control is performed for a predetermined period.

[0038] If there is multiple pieces of request information within a predetermined period, i.e., if facility 2 reduces the amount of power received from power grid 1 during multiple unit time slots within the predetermined period, remuneration prediction unit 22 can simply add up the remuneration amounts predicted for each of those multiple unit time slots. In other words, remuneration prediction unit 22 can simply calculate the sum of the first predicted remuneration amounts predicted for each of the multiple unit time slots within the predetermined period, and can also calculate the sum of the second predicted remuneration amounts predicted for each of the multiple unit time slots within the predetermined period.

[0039] The first discharge control is a control that, when the dischargeable amount of power from the storage battery 11 determined based on the remaining power storage data during a unit time period specified in the reduction request data is greater than the load power amount of the power load 4 during that unit time period determined based on the load power data, discharges the maximum amount of power from the storage battery 11 so as to cause a reverse flow of power from the facility 2 to the power grid 1 in order to reduce the power receiving point power amount during that unit time period, and when the dischargeable amount of power from the storage battery 11 during that unit time period is equal to or less than the load power amount of the power load 4 during that unit time period, discharges the maximum amount of power from the storage battery 11 so as not to cause a reverse flow of power from the facility 2 to the power grid 1.

[0040] Here, the load power amount of the power load 4 in the unit time slot, which is determined based on the load power data and which is referenced by the remuneration amount prediction unit 22, can be derived based on the load power data stored in the information storage unit 24. For example, the average value of the load power amounts for the four days with the largest load power amounts of the power load 4 in the same time slot as the unit time slot of the day specified in the reduction request data out of the last five days before the day specified in the reduction request data can be determined as the load power amount for the unit time slot on the day specified in the reduction request data. Note that the method of deriving the load power amount is not limited to the above and can be changed as appropriate.

[0041] The second discharge control is a control in which, when the dischargeable amount of power from the storage battery 11 during the unit time period specified in the reduction request data is greater than the load power amount of the power load 4 during that unit time period, the storage battery 11 is discharged to the maximum extent possible so as to prevent reverse power flow from the facility 2 to the power grid 1 in order to reduce the power receiving point power amount during that unit time period, and when the dischargeable amount of power from the storage battery 11 during that unit time period is equal to or less than the load power amount of the power load 4 during that unit time period, the storage battery 11 is discharged to the maximum extent possible so as to prevent reverse power flow from the facility 2 to the power grid 1.

[0042] Fig. 2 is a diagram showing a case where the dischargeable energy amount in a unit time period is equal to or less than the load energy amount. Fig. 3 is a diagram showing a case where the dischargeable energy amount in a unit time period is greater than the load energy amount. The load energy amount of the power load 4 installed in the facility 2 in a unit time period, which is referred to by the remuneration prediction unit 22, is a value derived using the method described above, and can be derived by the remuneration prediction unit 22, for example.

[0043] As shown in Fig. 2, when the dischargeable energy amount of the storage battery 11 in a unit time period is equal to or less than the load energy amount of the power load 4 provided in the facility 2 in that unit time period, it is not possible to make the dischargeable energy amount of the storage battery 11 in that unit time period greater than the 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 11 in that unit time period is equal to or less than the load energy amount of the power load 4 provided in the facility 2 in that unit time period, the operation control unit 12 performs second discharge control in that unit time period. The second discharge control is control to discharge the maximum amount of energy from the storage battery 11 so as not to cause reverse power flow from the facility 2 to the power grid 1.

[0044] As shown in Figure 3, if the dischargeable amount of power from the storage battery 11 in a unit time period is greater than the load power amount of the power load 4 installed in the facility 2 in the unit time period, the discharged amount of power from the storage battery 11 in the unit time period can be made greater than the load power amount, or the discharged amount of power from the storage battery 11 in the unit time period can be made equal to or less than the load power amount.

[0045] FIG. 4 is a diagram illustrating the first discharge control. In the first discharge control, as shown in the figure, the maximum amount of power is discharged from the storage battery 11 so that power flows backward from the facility 2 to the power grid 1 in order to reduce the amount of power received at the power receiving point in a unit time period. For example, an amount of power greater than the load power amount in a unit time period is discharged from the storage battery 11. Therefore, as shown in FIG. 4, the amount of discharged power in a unit time period is the dischargeable power amount, and the value obtained by subtracting the load power amount from the discharged power amount is the amount of backward flow power. The remuneration amount prediction unit 22 then derives the first predicted remuneration amount by multiplying the first remuneration unit price by the amount of backward flow power in a unit time period predicted when power is discharged from the storage battery 11 so that power flows backward 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 24.

[0046] FIG. 5 is a diagram illustrating the second discharge control. In the second discharge control, as shown in the figure, the storage battery 11 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 amount of discharged power in a unit time period is equal to the amount of load power. The remuneration amount prediction unit 22 then derives the second predicted remuneration amount by multiplying the second remuneration unit price by the predicted amount of discharged power in a unit time period when the storage battery 11 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 24.

[0047] 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.

[0048] Then, information output unit 23 of battery management device 20 outputs the first predicted remuneration amount and the second predicted remuneration amount predicted by remuneration amount prediction unit 22 to the user of facility 2. For example, information output unit 23 transmits the first predicted remuneration amount and the second predicted remuneration amount predicted by remuneration amount prediction unit 22 to the user's email address or the like stored in information storage unit 24. As a result, the user of facility 2 can recognize the first predicted remuneration amount and the second predicted remuneration amount using terminal device 5 or the like.

[0049] As described above, the battery management device 20 can derive a first predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power at the power receiving point when the first discharge control is performed for a predetermined period, and a second predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power at the power receiving point when the second discharge control is performed for a predetermined period. As a result, it is possible to clarify whether the economic benefit of the facility 2 will be greater if the first discharge control is performed or if the second discharge control is performed. Therefore, it is possible to provide a battery management device 20 that can find a method of operating the storage battery 11 to maximize economic benefit.

[0050] <Another embodiment> In the above embodiment, a specific example of the configuration of the battery management device 20 has been described, but the configuration is not limited to that described in the above embodiment and can be modified as appropriate.

[0051] 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]

[0052] The present invention can be used in a storage battery management device that can find a method for operating a storage battery to increase economic benefits. [Explanation of symbols]

[0053] 1 Power system 2 Facilities 3. Power Lines 4 Power load 5 Terminal Devices 6 Power measurement section 7. Information and communication lines 10. Energy storage device 11 Storage battery 12 Operation control section 13 Storage section 20 Storage battery management device 21 Information Acquisition Department 22 Remuneration Forecasting Department 23 Information output section 24 Information storage section

Claims

1. an information acquisition unit that acquires, in a facility where an electric power load and a storage battery are connected to an electric power grid, load power data indicating a time transition of the load power of the electric power load over a predetermined period of time, remaining power storage amount data indicating a time transition of a remaining amount of stored power of the storage battery over the predetermined period when the storage battery is charged and discharged under predetermined charge and discharge conditions, and reduction request data that specifies one or more unit time periods among a plurality of unit time periods that make up the predetermined period, during which a request is made to reduce the electric power receiving point amount, which is the amount of electric power at the electric power receiving point of the facility; a remuneration amount prediction unit that derives a first predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power receiving point electric power when a first discharge control is performed during the predetermined period, and a second predicted remuneration amount predicted to be obtained as a remuneration for reducing the amount of power receiving point electric power when a second discharge control is performed during the predetermined period, the first discharge control is control 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 amount of power at the power receiving point in the unit time period specified in the reduction request data, when the amount of power that can be discharged from the storage battery determined based on the remaining power storage data in the unit time period is greater than the load power amount of the power load in the unit time period determined based on the load power data, and 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 in order to reduce the amount of power that can be received at the power receiving point in the unit time period, when the amount of power that can be discharged from the storage battery in the unit time period is equal to or less than the load power amount of the power load in the unit time period, The second discharge control is a control that, when the dischargeable amount of power of the storage battery during the unit time period specified in the reduction request data is greater than the load amount of power of the power load during the unit time period, discharges the maximum amount of power from the storage battery so as not to prevent a reverse flow of power from the facility to the power system in order to reduce the power receiving point power amount during the unit time period, and, when the dischargeable amount of power of the storage battery during the unit time period is equal to or less than the load amount of power of the power load during the unit time period, discharges the maximum amount of power from the storage battery so as not to prevent a reverse flow of power from the facility to the power system.

2. The battery management device according to claim 1 , further comprising an information output unit that outputs the first predicted remuneration amount and the second predicted remuneration amount predicted by the remuneration amount prediction unit to users of the facility.

3. The remuneration amount prediction unit deriving the first predicted remuneration amount by multiplying a first remuneration unit price by an amount of reverse flow power when power is allowed to flow backward from the facility to the power grid during the unit time period specified in the reduction request data; A battery management device as described in claim 1 or 2, which derives the second predicted remuneration amount by multiplying the second remuneration unit price by the amount of discharged electricity when the storage battery is discharged so as not to cause reverse flow of electricity from the facility to the power grid during the unit time period specified in the reduction request data.

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

5. The battery management device according to claim 1 or 2, wherein the load power amount for the unit time period is the average value of the load power amount for the time period for the four days with the largest load power amount for the same time period as the unit time period out of the last five days in the past.

6. The battery management device according to claim 1 or 2, wherein an upper limit of the remaining charge capacity that prohibits further charging and a lower limit of the remaining charge capacity that prohibits further discharging are set for the battery, and the dischargeable amount of energy is determined taking into account the upper limit of the remaining charge capacity and the lower limit of the remaining charge capacity.

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

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