Charge / discharge control device, charge / discharge control method, power transaction settlement system, power transaction settlement method and program

Abstract

To sell power in appropriate timing corresponding to a market price and a contract price.SOLUTION: A charge / discharge control device controls exchange of power between a power storage facility and a power receiving facility from commercial power. The device comprises: a power contract information acquisition section for acquiring contract information, in which a power price on a unit time basis is determined, regarding the commercial power; a market price information acquisition section for acquiring market price information indicating a market price on a unit time basis which is transacted on a buying and selling market of commercial power; and a charge / discharge control section which switches charge from the commercial power to the power storage facility and discharge from the power storage facility to at least one of supply to a load and an inverse load flow to the commercial power on the basis of a contract power price indicated by the acquired contract information and the market price indicated by the market price information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a charge / discharge control device, a charge / discharge control method, an energy trading settlement system, an energy trading settlement method, and a program. [Background technology]

[0002] 2. Description of the Related Art Conventionally, an electric power control system has been proposed that allows electric power charged in a storage battery to be bought and sold in a building equipped with the storage battery (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Republished WO2020 / 026874 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology described above, there is a problem that the building owner cannot obtain market prices and cannot sell electricity at an appropriate time according to the market price.

[0005] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a charge / discharge control device, a charge / discharge control method, an electricity trading settlement system, an electricity trading settlement method, and a program that can sell electricity at appropriate timing according to the market price and the contract price. [Means for solving the problem]

[0006] One embodiment of the present invention is a charge / discharge control device that controls the exchange of power between a power storage facility and a power receiving facility from commercial power, and includes: a power contract information acquisition unit that acquires contract information in which the power price per unit time for commercial power is set; a market price information acquisition unit that acquires market price information indicating the market price per unit time traded in the commercial power buying and selling market; and a charge / discharge control unit that switches between charging the power storage facility from the commercial power and discharging from the power storage facility for at least one of supply to a load and reverse flow to the commercial power, based on the contract power price indicated in the acquired contract information and the market price indicated by the market price information.

[0007] Moreover, one embodiment of the present invention is a method by a computer device that controls the exchange of power between an energy storage facility and an energy receiving facility receiving power from commercial power, the method comprising the steps of: acquiring contract information for commercial power in which an energy price per unit time is set; acquiring market price information indicating the market price per unit time traded in a commercial power buying and selling market; and switching between charging the energy storage facility from the commercial power and discharging from the energy storage facility for at least one of supply to a load and reverse flow to the commercial power, based on the contract power price indicated in the acquired contract information and the market price indicated by the market price information.

[0008] Moreover, one embodiment of the present invention is a program for causing a computer that controls the exchange of power between a power storage facility and a power receiving facility from commercial power to acquire contract information for commercial power, in which the power price per unit time is set, acquire market price information indicating the market price per unit time traded in the commercial power buying and selling market, and switch between charging the power storage facility from the commercial power and discharging from the power storage facility for at least one of supply to a load and reverse flow to the commercial power, based on the contract power price indicated in the acquired contract information and the market price indicated by the market price information.

[0009] Moreover, one embodiment of the present invention is an electricity trading settlement system that controls the buying and selling of electricity between an energy storage facility and an equipment receiving electricity from commercial electricity, and includes an electricity contract information acquisition unit that acquires contract information in which an electricity price per unit time for commercial electricity is set, a market price information acquisition unit that acquires market price information indicating the market price per unit time traded in the commercial electricity buying and selling market, and a settlement unit that purchases electricity from the commercial electricity or sells electricity from the energy storage facility based on the contract electricity price indicated in the acquired contract information and the market price indicated by the market price information.

[0010] Moreover, one embodiment of the present invention is an electricity trading settlement method for controlling the buying and selling of electricity between an energy storage facility and an equipment receiving electricity from commercial electricity, the electricity trading settlement method comprising the steps of acquiring contract information for commercial electricity, in which an electricity price per unit time is set, acquiring market price information indicating the market price per unit time traded in the commercial electricity buying and selling market, and purchasing electricity from the commercial electricity or selling electricity from the energy storage facility based on the contract electricity price indicated in the acquired contract information and the market price indicated by the market price information.

[0011] Moreover, one embodiment of the present invention is a program for causing a computer that controls the buying and selling of electricity between a power storage facility and a facility receiving electricity from commercial power to acquire contract information for commercial power, in which the electricity price per unit time is set, acquire market price information indicating the market price per unit time traded in the commercial power buying and selling market, and purchase electricity from the commercial power or sell electricity from the power storage facility based on the contract electricity price indicated in the acquired contract information and the market price indicated by the market price information. Effect of the Invention

[0012] According to the present invention, electricity can be sold at an appropriate timing according to the market price and the contract price. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a diagram illustrating an example of a functional configuration of the charge / discharge control system according to the present embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of an operation flow of the charge / discharge control device of the present embodiment. [Diagram 3] FIG. 4 is a diagram showing a first example of an electricity price pattern of contract information in the present embodiment. [Figure 4] FIG. 11 is a diagram showing a second example of an electricity price pattern of the contract information of the present embodiment. [Diagram 5] FIG. 11 is a diagram showing a third example of an electricity price pattern of contract information in the present embodiment. [Figure 6] FIG. 11 is a diagram showing a fourth example of an electricity price pattern of the contract information of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a diagram showing an example of a functional configuration of a charge / discharge control system 1 according to the present embodiment. The charge / discharge control system 1 is configured by connecting a charge / discharge control device 10, a building 20, and a contract information database 40 to each other via a network N1. The charge / discharge control system 1 is also configured by connecting the charge / discharge control device 10 and a wholesale electricity market 30 to each other via a network N2.

[0015] The charge / discharge control device 10 is, for example, a computer device operated by an electric power supply company. The electric power supply company is an entity that supplies electric power to users of the building 20 (for example, the owners and residents of the building 20. In the following description, these are collectively referred to as users of the building 20 or simply as users). The contract information database 40 stores information (contract information 401) on the power supply contract concluded between the user of the building 20 and the power supply company.

[0016] The power supply business operator purchases power traded in the power wholesale market 30 and sells the purchased power to users of the building 20 based on the contract information 401. The power supply business operator also purchases power provided by users of the building 20 and sells the purchased power in the power wholesale market 30 based on the contract information 401.

[0017] The power supply company makes a profit by selling the power purchased from the user of the building 20 in the wholesale power market 30 at a price higher than the purchase price (for example, the contract price Pc set in the contract information 401). A part of the profit made by the power supply company is returned to the user of the building 20 in the form of, for example, a discount on the electricity bill.

[0018] Here, the price of electricity traded in the electricity wholesale market 30 fluctuates based on market principles and cannot be determined by the electricity supply company or the users of the building 20. On the other hand, the price of electricity traded between the electricity supply company and the users of the building 20 is stipulated by the price according to the electricity supply contract (i.e., the contract price Pc determined in the contract information 401).

[0019] The charge / discharge control device 10 controls the power equipment of the building 20 based on market price information 301 indicating the market price Pm of electricity traded in the electricity wholesale market 30 (buying and selling market) and contract information 401 stored in the contract information database 40. The configurations of the building 20 and the charge / discharge control device 10 will be described below.

[0020] [Building Functionality] The building 20 includes a solar power generation facility 210 , a power storage facility 220 , a power receiving facility 230 , a load 240 , a communication device 250 , and a power control device 260 . The solar power generation facility 210 is installed on the roof of the building 20 or the like, and receives sunlight to generate electricity. The power storage facility 220 includes a power storage device such as a secondary battery, and charges and discharges power supplied from the solar power generation facility 210 or the commercial power system 31 .

[0021] In this embodiment, the solar power generation facility 210 and the power storage facility 220 are owned by a power supply company. In this case, the user of the building 20 leases the installation space for the solar power generation facility 210 and the power storage facility 220 (i.e., a part of the building 20) to the power supply company. With this type of contract, the user of the building 20 can use solar power generation without purchasing the solar power generation facility 210 and the power storage facility 220. In addition, in this embodiment, the power supply contract concluded between the user of the building 20 and the power supply company provides that the power supply company will (or may) control the exchange of power between the solar power generation equipment 210 and the storage equipment 220.

[0022] The power receiving equipment 230 receives power supplied from commercial power and supplies it to each part of the building 20. The power receiving equipment 230 is also capable of outputting power supplied by the solar power generation equipment 210 and the power storage equipment 220 to the commercial power grid 31. In the following description, outputting power from the power receiving equipment 230 of the building 20 to the commercial power grid 31 is also referred to as "reverse power flow" to the commercial power grid 31 (or simply "reverse power flow"). In the case of reverse power flow, the electricity generated by the photovoltaic power generation facility 210 of the building 20 (or the electricity stored in the power storage facility 220) is sold to the wholesale electricity market 30.

[0023] The load 240 is a general term for electrical equipment used in the building 20 . The communication device 250 performs wireless or wired communication with the charge / discharge control device 10. The communication device 250 receives control information 101 from the charge / discharge control device 10, and gives instructions based on the received control information 101 to the power receiving equipment 230 and the power control device 260. It should be noted that the communication device 250 of the building 20 is not connected to the network N2 of the wholesale electricity market 30. In other words, the communication device 250 cannot directly acquire the market price information 301 of the wholesale electricity market 30 (buying and selling market).

[0024] The power control device 260 controls the exchange of power between each facility of the building 20 (the photovoltaic power generation facility 210, the power storage facility 220, and the power receiving facility 230) and the load 240. The power control device 260 of this embodiment operates based on control information 101 that the communication device 250 receives from the charge / discharge control device 10. For example, the power control device 260 charges the power generated by the solar power generation facility 210 to the power storage facility 220 and supplies the power to the load 240. In addition, the power control device 260 supplies the power stored in the power storage facility 220 to the load 240 and causes a reverse power flow to the commercial power grid 31 via the power receiving facility 230.

[0025] In other words, the charge / discharge control device 10 is a device that controls the exchange of power among the solar power generation facility 210, the power storage facility 220, and the commercial power receiving facility 230. The functional configuration of the charge / discharge control device 10 will be described below.

[0026] [Functional configuration of charge / discharge control device] The charge / discharge control device 10 is a computer device, and includes a calculation unit 110, a storage unit 120, and a communication unit .

[0027] The communication unit 130 is connected to the network N1 and the network N2. The communication unit 130 receives contract information 401 from the contract information database 40 via the network N1, and transmits the calculation result of the calculation unit 110 (e.g., control information 101) to the building 20. The communication unit 130 also receives information indicating the market price of electricity (market price information 301) from the electricity wholesale market 30 (buying and selling market) via the network N2.

[0028] The market price information 301 indicates, for example, the trading rate of electricity for the next day, and is provided on the day before the transaction. Alternatively, the market price information 301 may be provided in real time based on the trading rate, which changes from moment to moment. It should be noted that power supply companies can connect to this network N2, but general users (for example, the owners and residents of the building 20) cannot directly connect to the network N2.

[0029] The storage unit 120 includes, for example, a semiconductor memory and a hard disk device, and stores programs and data for the operation of the calculation unit 110. The calculation unit 110 includes, for example, a central processing unit (CPU) and operates based on programs and data stored in the storage unit 120 to provide various functions. The calculation unit 110 includes, as its software function units (or hardware function units), an electricity contract information acquisition unit 111, a market price information acquisition unit 112, and a charge / discharge control unit 113.

[0030] The power contract information acquisition unit 111 acquires contract information 401 that defines the contract price Pc (power price) for commercial power per unit time. The unit time here is, for example, 30 minutes. In this example, the contract price Pc is set in 30-minute units.

[0031] The market price information acquisition unit 112 acquires market price information 301 indicating the market price Pm per unit time traded in the commercial power wholesale market 30 (buying and selling market). The unit time here is, for example, 30 minutes. In the wholesale electricity market 30, a market computer system (not shown) calculates the buying and selling price of electricity (i.e., the market price Pm) based on various factors. The market price information acquisition unit 112 acquires market price information 301 indicating the market price Pm from the market computer system via the network N2.

[0032] The charge / discharge control unit 113 switches between charging the power storage equipment 220 from at least one of the solar power generation equipment 210 and commercial electricity, and discharging from the power storage equipment 220 for at least one of supply to the load 240 and reverse flow to the commercial electricity, based on the contract price Pc indicated by the acquired contract information 401 and the market price Pm indicated by the market price information 301.

[0033] The communication unit 130 transmits the calculation result (e.g., control information 101) of the calculation unit 110 to the building 20. That is, the communication unit 130 transmits the control result of the charge / discharge control unit 113 to the building 20 including the photovoltaic power generation equipment 210, the power storage equipment 220, the power receiving equipment 230, and the power control device 260 (control device) that controls the exchange of power.

[0034] [Operation flow of charge / discharge control device] Next, the flow of operations of the charge / discharge control device 10 will be described with reference to FIG. FIG. 2 is a diagram showing an example of the flow of operations of the charge / discharge control device 10 of the present embodiment.

[0035] (Step S10) The power contract information acquisition unit 111 acquires the contract information 401. In one example of this embodiment, the contract information 401 is pre-stored in the contract information database 40. The power contract information acquisition unit 111 acquires the contract information 401 stored in the contract information database 40 via the network N1 and the communication unit 130. The power supply contract indicated by the contract information 401 has a plurality of power price patterns corresponding to changes in the contract price Pc per unit time. Here, an example of the power price pattern will be described with reference to FIG. 3 to FIG.

[0036] [Pattern 1] 3 is a diagram showing a first example of the power price pattern of the contract information 401 of this embodiment. FIG. 3 [A] shows a first power price pattern which is a fixed contract price Pc that does not fluctuate daily.

[0037] In this example, the contract information 401 is information indicating a first power price pattern, which is a fixed contract price Pc that does not fluctuate daily. The contract price Pc1, which is the price that the electric power company procures from the user of the building 20, is a fixed price that does not vary with the time of day (daily variation).

[0038] The market procurement price Pmp, which is the price at which an electric power business operator procures electricity from the wholesale electricity market 30, is the sum of the market price Pm set in the wholesale electricity market 30 and the wheeling charge Pt, which is an electricity transmission fee. That is, when an electric power business operator procures electricity from the wholesale electricity market 30, the electric power business operator pays the market procurement price Pmp, which is the sum of the market price Pm and the wheeling charge Pt, to the wholesale electricity market 30.

[0039] 1B shows an example of the change over time in the power generated by the photovoltaic power generation facility 210 of the building 20. In this example, the photovoltaic power generation facility 210 generates more power than is consumed by the load 240 of the building 20 between time t12 and time t13, resulting in surplus power. The power supply company can purchase this surplus power from the users of the building 20 and sell it in the wholesale power market 30.

[0040] However, from time t11 to time t14 (e.g., during the daytime), the market procurement price Pmp is lower than the contract price Pc1. If the power supply company sells the electricity generated in the building 20 from time t11 to time t14 in the wholesale electricity market 30, the power supply company cannot make a profit. Therefore, the power supply company charges the electricity generated by the solar power generation facility 210 to the power storage facility 220 from time t11 to time t14 (e.g., from time t12 to time t13).

[0041] Furthermore, in this example, the market procurement price Pmp of the photovoltaic power generation facility 210 exceeds the contract price Pc1 from time t15 to time t16 (for example, during the night). Therefore, the power supply company can make a profit by purchasing power from users of the building 20 between time t15 and time t16 and selling it in the wholesale power market 30. Therefore, the power supply company sells power to the wholesale power market 30 between time t15 and time t16. Specifically, the power supply company discharges the power that was charged in the power storage facility 220 during the day from the power storage facility 220 between time t15 and time t16 and causes a reverse power flow to the commercial power grid 31.

[0042] That is, when the market price Pm exceeds a certain contract price Pc1, the charge / discharge control device 10 transmits control information 101 for discharge and reverse power flow to the building 20. The power control device 260 of the building 20 causes discharge from the power storage facility 220 and reverse power flow to the commercial power.

[0043] Here, since the users of the building 20 cannot connect to the network N2, they cannot know the trading price of electricity (market price Pm) in the wholesale electricity market 30. Therefore, the users of the building 20 cannot determine when to sell the surplus electricity generated by the solar power generation facility 210 to the wholesale electricity market 30 in order to make a profit. On the other hand, according to the charge / discharge control system 1 of the present embodiment, the charge / discharge control device 10 that can obtain the market price Pm manages the timing of selling surplus electricity of the building 20 based on the contract price Pc and the market price Pm. Therefore, according to the charge / discharge control system 1, electricity can be sold at an appropriate timing at which profits can be obtained from the wholesale electricity market 30.

[0044] [Pattern 2] 4 is a diagram showing a second example of the power price pattern of the contract information 401 of this embodiment. [A] in the same figure shows a second power price pattern in which the contract price Pc in the nighttime is set higher than the contract price Pc in the daytime.

[0045] In this example, the contract information 401 is information indicating a second power price pattern (contract price Pc2) in which the contract price Pc for the nighttime hours is set higher than the contract price Pc for the daytime hours.

[0046] 3[B] shows an example of the change over time in the power generated by the photovoltaic power generation facility 210 of the building 20, similar to FIG. 3[B]. In this example, the photovoltaic power generation facility 210 generates surplus power between time t22 and time t23. The power supply company can purchase this surplus power from the user of the building 20 and sell it in the wholesale power market 30.

[0047] However, from time t21 to time t24 (e.g., during the daytime), the market procurement price Pmp is lower than the contract price Pc2. If the power supply company sells the electricity generated in the building 20 from time t21 to time t24 in the wholesale electricity market 30, the power supply company cannot make a profit. Therefore, the power supply company charges the electricity generated by the solar power generation facility 210 to the power storage facility 220 from time t21 to time t24 (e.g., from time t22 to time t23).

[0048] Furthermore, in this example, the market procurement price Pmp of the photovoltaic power generation facility 210 exceeds the contract price Pc2 from time t25 to time t26 (for example, during the night). Therefore, the power supply company can make a profit by purchasing power from users of the building 20 between time t25 and time t26 and selling it in the wholesale power market 30. Therefore, the power supply company sells power to the wholesale power market 30 between time t25 and time t26. Specifically, the power supply company discharges the power that was charged in the power storage facility 220 during the day from the power storage facility 220 at night and causes a reverse power flow to the commercial power grid 31.

[0049] That is, when the market price Pm exceeds a certain contract price Pc1, the power supplier transmits control information 101 for discharge and reverse power flow from the charge / discharge control device 10 to the building 20. The power control device 260 of the building 20 discharges electricity from the power storage facility 220 and causes a reverse power flow to the commercial power.

[0050] In this pattern 2, as in the above-described pattern 1, the charge / discharge control system 1 can sell electricity at an appropriate timing from the wholesale electricity market 30 to obtain a profit.

[0051] [Pattern 3] 5 is a diagram showing a third example of the power price pattern of the contract information 401 of this embodiment. [A] in the same figure shows a third power price pattern in which the contract price Pc in the daytime is set higher than the contract price Pc in the nighttime.

[0052] In this example, the contract information 401 is information indicating a third power price pattern (contract price Pc3) in which the contract price Pc for the daytime hours is set higher than the contract price Pc for the nighttime hours.

[0053] 3[B] shows an example of the change over time in the power generated by the photovoltaic power generation facility 210 of the building 20, similar to FIG. 3[B]. In this example, the photovoltaic power generation facility 210 generates surplus power between time t33 and time t34. The power supply company can purchase this surplus power from the user of the building 20 and sell it in the wholesale power market 30.

[0054] However, from time t33 to time t34 (e.g., during the daytime), the market procurement price Pmp is lower than the contract price Pc3. If the power supply company sells the power generated in the building 20 between time t33 and time t34 in the wholesale power market 30, the power supply company cannot make a profit.

[0055] Here, in the third electricity price pattern, the contract price Pc in the daytime is set higher than the contract price Pc in the nighttime. In an example of an electricity supply contract according to this embodiment, when an electricity supply company purchases electricity stored in the energy storage equipment 220 from a user of the building 20, the fee is determined based on the contract price Pc3 at the time when the electricity storage equipment 220 is charged. In the power supply contract shown in this example, when the power supply company purchases the electricity stored in the power storage equipment 220 from time t33 to time t34 (e.g., during the daytime hours), the price will be higher than that of the first power price pattern and the second power price pattern described above. Therefore, the power supply company does not allow the power storage facility 220 to charge between time t33 and time t34. In this case, the power supply company causes the power storage facility 220 to store power during a time period (e.g., from time t31 to time t32) when the power to be stored in the power storage facility 220 is cheap. The power supply company causes the power storage facility 220 to discharge power and perform a reverse power flow to the commercial power grid 31 during a time period (e.g., from time t35 to time t36) when the market price Pm exceeds the contract price Pc3 (e.g., during the night).

[0056] That is, the charge / discharge control device 10 does not allow the power storage facility 220 to charge when the market price Pm is lower than the contracted power price Pc3 for the daytime period. When the market price Pm is higher than the nighttime contracted power price Pc3 and the power storage facility 220 can discharge electricity, the charge / discharge control device 10 causes the power storage facility 220 to discharge electricity and provides a reverse power flow to the commercial power grid 31.

[0057] That is, according to the charge / discharge control system 1, it is possible to sell electricity at an appropriate timing at which a profit can be obtained from the wholesale electricity market 30.

[0058] [Pattern 4] 6 is a diagram showing a fourth example of the power price pattern of the contract information 401 of this embodiment. FIG. 6 [A] shows a fourth power price pattern in which the contract price Pc is linked to the market price Pm.

[0059] In this example, the contract information 401 is information indicating a fourth electricity price pattern (contract price Pc4) in which the contract price Pc is linked to the market price Pm.

[0060] 3[B] shows an example of the change over time in the power generated by the photovoltaic power generation facility 210 of the building 20, similar to FIG. 3[B]. In this example, the photovoltaic power generation facility 210 generates surplus power between time t42 and time t43. The power supply company can purchase this surplus power from the user of the building 20 and sell it in the wholesale power market 30.

[0061] However, from time t41 to time t44 (e.g., during the daytime), the market procurement price Pmp is lower than the contract price Pc4. If the power supply company sells the electricity generated in the building 20 from time t41 to time t44 in the wholesale electricity market 30, the power supply company cannot make a profit. Therefore, the power supply company charges the electricity generated by the solar power generation facility 210 to the power storage facility 220 from time t41 to time t44 (e.g., from time t42 to time t43).

[0062] Furthermore, in this example, the market procurement price Pmp of the photovoltaic power generation facility 210 exceeds the contract price Pc4 from time t45 to time t46 (for example, during the nighttime hours). Therefore, the power supply company can make a profit by purchasing power from the users of the building 20 between time t45 and time t46 and selling it in the wholesale power market 30. Therefore, the power supply company sells power to the wholesale power market 30 between time t45 and time t46. Specifically, the power supply company discharges the power that was charged in the power storage facility 220 during the day from the power storage facility 220 at night and causes a reverse power flow to the commercial power grid 31.

[0063] That is, when the market price Pm exceeds the contract price Pc4, the power supplier transmits control information 101 for discharge and reverse power flow from the charge / discharge control device 10 to the building 20. The power control device 260 of the building 20 discharges electricity from the power storage facility 220 and causes a reverse power flow to the commercial power.

[0064] Even in this pattern 4, the charge / discharge control system 1 can sell electricity at an appropriate timing that allows profits to be obtained from the wholesale electricity market 30. Returning to FIG. 2, the explanation of the flow of operations of the charge / discharge control device 10 will be continued.

[0065] (Step S20) The market price information acquisition unit 112 acquires the market price information 301. In one example of this embodiment, the market price information 301 is calculated by a market computer system (not shown) of the electricity wholesale market 30 (buying and selling market). The market price information acquisition unit 112 acquires the market price information 301 from the market computer system (not shown) via the network N2.

[0066] (Step S30) The charge / discharge control unit 113 compares the contract price Pc indicated by the contract information 401 acquired in step S10 with the market price Pm indicated by the market price information 301 acquired in step S20. The specific comparison procedure has been described in the examples of the above-mentioned patterns 1 to 4, and therefore will not be described here.

[0067] (Step S40) The charge / discharge control unit 113 generates control information 101. This control information 101 includes, for the power control device 260, a charge instruction to charge surplus power to the power storage equipment 220, a discharge instruction to discharge power from the power storage equipment 220, and a reverse power flow instruction to cause a reverse power flow from the power receiving equipment 230 to the commercial power grid 31. That is, the charge / discharge control unit 113 switches between charging and discharging from the power storage facility 220 by comparing the market price Pm with the contract price Pc.

[0068] As described above, the market procurement price Pmp at which the power supply company procures electricity from the wholesale electricity market 30 includes the wheeling charge Pt. Therefore, it can be said that the charge / discharge control unit 113 switches between charging and discharging from the electricity storage facility 220 by comparing the total amount of the market price Pm and the wheeling charge for electricity with the contract price Pc.

[0069] (Step S50) The communication unit 130 transmits the control information 101 generated in step S40 (that is, the control result of the charge / discharge control unit 113) to the building 20 to be controlled, and ends a series of operations.

[0070] As described above, according to the charge / discharge control system 1 of the present embodiment, it is possible to sell electricity at an appropriate timing at which a profit can be obtained from the wholesale electricity market 30.

[0071] The charge / discharge control system 1 may operate based on the market price Pm for each of the multiple regions. In this case, the market price information acquisition unit 112 acquires the market price Pm for each of the multiple regions. The charge / discharge control unit 113 switches between charging and discharging from the power storage facility 220 by comparing the market price Pm for the region in which the target building 20 is located, among the market prices Pm for each region, with the contract price Pc.

[0072] According to the charge / discharge control system 1 configured in this manner, it is possible to sell electricity at a more appropriate timing that allows greater profits to be obtained depending on the area in which the building 20 is located.

[0073] Furthermore, the charge / discharge control system 1 may be connected to an energy trading settlement system (not shown), or may be configured as a part of the energy trading settlement system. The energy trading settlement system (not shown) includes a computer device (not shown), and includes a settlement unit (not shown) as one of its functional units. The settlement unit purchases electricity from commercial electricity or sells electricity from the energy storage facility 220 based on the contract electricity price (e.g., contract price Pc) indicated by the acquired contract information 401 and the market price (e.g., market price Pm) indicated by the market price information 301. The settlement unit may also calculate a profit from the purchase or sale of electricity based on the difference between the contract price Pc and the market price Pm when the above-mentioned purchase or sale of electricity is performed. The settlement unit may have a function of presenting the calculated profit to users and electricity supply companies. The settlement unit may also estimate the difference between the contract price Pc and the market price Pm at a certain point in the future based on the history of past transaction conditions. In this case, the settlement unit may have a function of presenting the estimated profit based on the estimation to users and the power supply company.

[0074] Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and appropriate modifications can be made without departing from the spirit of the present invention. The configurations described in the above-mentioned embodiments may be combined.

[0075] Each unit of each device in the above-described embodiments may be realized by dedicated hardware, or may be realized by a memory and a microprocessor.

[0076] In addition, each part of each device may be composed of a memory and a CPU (central processing unit), and the functions of each part of each device may be realized by loading a program for realizing the function of each part into the memory and executing the program.

[0077] In addition, a program for implementing the functions of each unit of each device may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed to perform processing by each unit of the control unit. Note that the term "computer system" here includes hardware such as the OS and peripheral devices.

[0078] In addition, if a WWW system is used, the "computer system" also includes the homepage providing environment (or display environment). In addition, "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems. Furthermore, "computer-readable recording medium" also includes those that dynamically hold a program for a short period of time, such as communication lines when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and those that hold a program for a certain period of time, such as volatile memory inside a computer system that serves as a server or client in such cases. Furthermore, the above program may be one that realizes part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system. [Explanation of symbols]

[0079] 1...Charge / discharge control system, 10...Charge / discharge control device, 110...Calculation unit, 111...Power contract information acquisition unit, 112...Market price information acquisition unit, 113...Charge / discharge control unit, 120...Memory unit, 130...Communication unit, 101...Control information, 20...Building, 210...Photovoltaic power generation equipment, 220...Electricity storage equipment, 230...Electricity receiving equipment, 240...Load, 250...Communication device, 260...Power control device, 30...Wholesale electricity market (buying and selling market), 301...Market price information, 31...Commercial power system, 40...Contract information database, 401...Contract information, Pm...Market price, Pmp...Market procurement price, Pc...Contract price, Pt...Wheel charge

Claims

1. A device for controlling the exchange of power between a power storage facility and a power receiving facility from commercial power, an electricity contract information acquisition unit that acquires contract information in which an electricity price per unit time for commercial electricity is set; a market price information acquisition unit that acquires market price information indicating a market price per unit time traded in a commercial electricity buying and selling market; a charge / discharge control unit that switches between charging the power storage equipment from the commercial power and discharging from the power storage equipment for at least one of supply to a load and reverse power flow to the commercial power, based on a contract power price indicated by the acquired contract information and a market price indicated by the market price information; A charge / discharge control device comprising:

2. The device is a device for controlling the exchange of power between the photovoltaic power generation facility, the power storage facility, and the power receiving facility from the commercial power. The charge / discharge control device according to claim 1 .

3. A transmission unit that transmits a control result of the charge / discharge control unit to a building that includes the power storage equipment, the power receiving equipment, and a control device that controls the exchange of power. The charge / discharge control device according to claim 1 , further comprising:

4. The contract information is information indicating a first electricity price pattern, which is a fixed contract electricity price that does not fluctuate daily, The charge / discharge control unit discharges electricity from the power storage facility and causes a reverse flow of electricity to commercial power when the market price exceeds the certain contracted power price. The charge / discharge control device according to claim 1 .

5. The contract information is information indicating a second electricity price pattern in which a contract electricity price in the nighttime is set higher than a contract electricity price in the daytime, The charge / discharge control unit discharges electricity from the power storage facility and causes a reverse power flow to commercial power when the market price exceeds a contracted power price for the nighttime period. The charge / discharge control device according to claim 1 .

6. The contract information is information indicating a third electricity price pattern in which a contract electricity price in the daytime is set higher than a contract electricity price in the nighttime, The charge / discharge control unit does not charge the power storage equipment when the market price is lower than the contracted power price for the daytime period, and discharges the power storage equipment and performs reverse power flow to commercial power when the market price is higher than the contracted power price for the nighttime period. The charge / discharge control device according to claim 1 .

7. The contract information is information indicating a fourth electricity price pattern in which a contract electricity price is linked to the market price, The charge / discharge control unit discharges electricity from the power storage facility and causes a reverse flow to commercial electricity when the market price exceeds a contracted power price. The charge / discharge control device according to claim 1 .

8. The charge / discharge control unit switches between charging and discharging from the power storage facility by comparing a total amount of the market price and the power wheeling charge with a contracted power price. The charge / discharge control device according to claim 1 .

9. The market price information acquisition unit acquires the market price for each of a plurality of regions, The charge / discharge control unit switches between charging and discharging from the power storage facility by comparing the market price in a region where a building to be controlled is located with the contracted power price, among the market prices for each region. The charge / discharge control device according to claim 1 .

10. A transmission unit that transmits a control result of the charge / discharge control unit to a building that includes the photovoltaic power generation equipment, the power storage equipment, the power receiving equipment, and a control device that controls the exchange of power. The charge / discharge control device according to claim 2 , further comprising:

11. The contract information is information indicating a first electricity price pattern, which is a fixed contract electricity price that does not fluctuate daily, The charge / discharge control unit discharges electricity from the power storage facility and causes a reverse flow of electricity to commercial power when the market price exceeds the certain contracted power price. The charge / discharge control device according to claim 2 .

12. The contract information is information indicating a second electricity price pattern in which a contract electricity price in the nighttime is set higher than a contract electricity price in the daytime, The charge / discharge control unit discharges electricity from the power storage facility and causes a reverse power flow to commercial power when the market price exceeds a contracted power price for the nighttime period. The charge / discharge control device according to claim 2 .

13. The contract information is information indicating a third electricity price pattern in which a contract electricity price in the daytime is set higher than a contract electricity price in the nighttime, The charge / discharge control unit does not charge the power storage equipment when the market price is lower than the contracted power price for the daytime period, and discharges the power storage equipment and performs reverse power flow to commercial power when the market price is higher than the contracted power price for the nighttime period. The charge / discharge control device according to claim 2 .

14. The contract information is information indicating a fourth electricity price pattern in which a contract electricity price is linked to the market price, The charge / discharge control unit discharges electricity from the power storage facility and causes a reverse flow to commercial electricity when the market price exceeds a contracted power price. The charge / discharge control device according to claim 2 .

15. The charge / discharge control unit switches between charging and discharging from the power storage facility by comparing a total amount of the market price and the power wheeling charge with a contracted power price. The charge / discharge control device according to claim 2 .

16. The market price information acquisition unit acquires the market price for each of a plurality of regions, The charge / discharge control unit switches between charging and discharging from the power storage facility by comparing the market price in a region where a building to be controlled is located with the contracted power price, among the market prices for each region. The charge / discharge control device according to claim 2 .

17. A method using a computer device for controlling the exchange of power between a power storage facility and a facility receiving commercial power, comprising: Acquiring contract information for commercial electricity, in which an electricity price per unit time is set; Obtaining market price information indicating the market price per unit time traded in the commercial electricity buying and selling market; switching between charging the power storage equipment from the commercial power and discharging from the power storage equipment for at least one of supply to a load and reverse power flow to the commercial power, based on a contract power price indicated by the acquired contract information and a market price indicated by the market price information; A charge / discharge control method comprising the steps of:

18. A computer that controls the exchange of power between the power storage facility and the facility receiving commercial power, Acquiring contract information for commercial electricity, in which an electricity price per unit time is set; Obtaining market price information indicating the market price per unit time traded in the commercial electricity buying and selling market; switching between charging the power storage equipment from the commercial power and discharging from the power storage equipment for at least one of supply to a load and reverse power flow to the commercial power, based on a contract power price indicated by the acquired contract information and a market price indicated by the market price information; A program for executing the above.

19. An energy trading settlement system that controls the buying and selling of electricity between an energy storage facility and an energy receiving facility from commercial power, an electricity contract information acquisition unit that acquires contract information in which an electricity price per unit time for commercial electricity is set; a market price information acquisition unit that acquires market price information indicating a market price per unit time traded in a commercial electricity buying and selling market; a settlement unit that purchases electricity from the commercial power source or sells electricity from the power storage facility based on a contract electricity price indicated by the acquired contract information and a market price indicated by the market price information; An energy trading settlement system comprising:

20. An energy trading settlement method for controlling buying and selling of electricity between an energy storage facility and an energy receiving facility from commercial power, comprising: Acquiring contract information for commercial electricity, in which an electricity price per unit time is set; Obtaining market price information indicating the market price per unit time traded in the commercial electricity buying and selling market; purchasing electric power from the commercial electric power source or selling electric power from the power storage facility based on a contract electric power price indicated by the acquired contract information and a market price indicated by the market price information; The energy trading settlement method includes:

21. A computer that controls the buying and selling of electricity between the energy storage facility and the facility receiving commercial electricity. Acquiring contract information for commercial electricity, in which an electricity price per unit time is set; Obtaining market price information indicating the market price per unit time traded in the commercial electricity buying and selling market; purchasing electric power from the commercial electric power source or selling electric power from the power storage facility based on a contract electric power price indicated by the acquired contract information and a market price indicated by the market price information; A program for executing the above.

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