Power trading system and program

Abstract

To effectively use power of a storage battery owned by a user, including a storage battery mounted on an electric car, to perform a power transaction.SOLUTION: A power transaction system according to an embodiment comprises first determination means, second determination means, and transaction processing means. The first determination means determines a magnitude relation between a power amount of a storage battery and a required power amount based on a use plan of the storage battery. The second determination means determines a magnitude relation between a power selling price set by a user who owns the storage battery as the power selling price and a power purchasing price set by an aggregator, or the magnitude relation between a power purchasing price set by the user as the power purchasing price and a power selling price set by the aggregator. The transaction processing means performs transaction processing of power between the user and the aggregator, on the basis of results of the first determination means and the second determination means.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] Embodiments of the present invention relate to a power trading system and a program.

Background Art

[0002] In recent years, with the increasing awareness of environmental issues, the introduction of renewable energy such as solar power generation and wind power generation has been progressing. However, since renewable energy is greatly affected by nature such as weather and temperature, it is currently unable to supply power stably. Against this background, the spread of distributed energy resources introduced on the consumer side has been progressing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] With the spread of the above-described distributed energy resources, for example, a mechanism for effectively utilizing the power stored in a storage battery mounted on an electric vehicle or a stationary storage battery for a house is required.

[0005] The problem to be solved by the present invention is to provide a power trading system and a program capable of performing power trading by effectively utilizing the power of storage batteries owned by users, including the storage batteries mounted on electric vehicles.

Means for Solving the Problems

[0006] A power trading system according to an embodiment includes a first determination means, a second determination means, and a trading processing means. The first determination means determines a magnitude relationship between the amount of power in a storage battery and the required amount of power based on the usage plan of the storage battery. The second determination means determines a magnitude relationship between the selling price set by the user who owns the storage battery and the buying price set by the aggregator, or a magnitude relationship between the buying price set by the user and the selling price set by the aggregator. The trading processing means performs power trading processing between the user and the aggregator based on the results of the first determination means and the second determination means. The power trading process includes a power selling process of discharging the power of the storage battery and selling the power to the aggregator, and a power buying process of buying the power provided by the aggregator and charging the storage battery. When the amount of power of the storage battery is more than the amount of power required by the usage plan, the trading process means compares the power buying price set by the aggregator with the first power selling price set by the user, and implements the power selling process when the power buying price of the aggregator is higher than the first power selling price. Also, when the amount of power of the storage battery is less than or equal to the amount of power required by the usage plan, if the power buying price of the aggregator is higher than the second power selling price set higher than the first power selling price, the power selling process is implemented according to the preset first power selling priority.

Brief Description of the Drawings

[0007]

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DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and the invention is not limited by the content described in the following embodiments. Modifications that can be easily conceived by those skilled in the art are naturally included in the scope of the disclosure. For the sake of clarity, in the drawings, the sizes, shapes, etc. of each part may be changed with respect to the actual implementation mode and represented schematically. In a plurality of drawings, the same reference numerals may be assigned to corresponding elements, and detailed descriptions may be omitted.

[0009] FIG. 1 is a diagram showing the configuration of a power trading system according to an embodiment. Note that the dotted line with an arrow in the figure indicates the flow of electric power.

[0010] The power trading system 10 in this embodiment is used for the microgrids 1, 2, 3... N (N is an arbitrary natural number) constructed in each area. The microgrids 1, 2, 3... N are connected to a cloud server (external server) 11 provided on the power grid side via a communication network NT1. The cloud server 11 exists as the upper server of this system and has a function of monitoring the power of the microgrids 1, 2, 3... N and stabilizing the power grid.

[0011] In the microgrids 1, 2, 3... N, the power trading system 10 is composed of a cloud server 21, a user 22, and an aggregator 23. The user 22 conducts power trading using the battery 37 (see FIG. 2) owned by himself / herself. Actually, as the user 22, there are a plurality of users 1, 2, 3... M (M is an arbitrary integer), and each has a power control device 24 that can be connected to the cloud server 21. The power control device 24 has a communication function for connecting to the cloud server 21 via the communication network NT2, and controls the charge and discharge operation of the battery 37 under the control of the cloud server 21.

[0012] On the one hand, the aggregator 23 is a specific operator that purchases electricity (buying electricity) from the user 22 or provides electricity to the user 22 (selling electricity) under a prior contract with the user 22. The aggregator 23 has a power control device 25. The power control device 25 is provided with a communication function for connecting to the cloud server 21 via the communication network NT2, and controls the charge and discharge operation of the power managed on the aggregator 23 side under the control of the cloud server 21.

[0013] FIG. 2 is a block diagram showing the configuration of the user-side power control device 24 used in the power trading system 10.

[0014] The power control device 24 includes a control device 31, a storage device 32, a communication unit 33, an input device 34, a display device 35, and a charge and discharge device 36. The control device 31 consists of a hardware processor including a CPU, and controls the power of the storage battery 37 by reading a program stored in the storage device 32.

[0015] The storage device 32 consists of memory devices such as ROM and RAM, and stores various data necessary for the processing of the control device 31 and control programs for controlling the power of the storage battery 37. The communication unit 33 consists of a communication device having a predetermined communication protocol, and performs communication processing with the cloud server 11 and the aggregator 23.

[0016] The input device 34 consists of an input device such as a keyboard or a touch panel, and is used when inputting data necessary for power trading. The display device 35 consists of a display device such as an LCD (Liquid Crystal Display), and is used when displaying the results of power trading. Note that as the input device 34 and the display device 35, a mobile terminal owned by the user may be used, or a car navigation system mounted on an electric vehicle may be used.

[0017] The charge / discharge device 36 discharges or charges the storage battery 37 via a wired cable or wireless communication. The storage battery 37 is mounted on an electric moving body including an electric vehicle (EV), or is installed in a stationary type in a building including a house, a facility, etc. The storage battery 37 is, for example, a lithium ion battery, has a predetermined capacity, and is used as a drive source for the target device 23a. The target device 23a is, for example, a moving body such as an electric vehicle or an electronic device used in a building, and includes all devices that can be driven by the storage battery 37. When the target device 23a is a moving body such as an electric vehicle, the storage battery 37 is included in the target device 23a.

[0018] Note that the power control device 25 on the aggregator side is also configured to include a control device, a communication device, etc., similar to the power control device 24 on the user side, to be connected to the cloud server 21, and to control the power managed by the aggregator 23.

[0019] FIG. 3 is a block diagram showing the configuration of the cloud server 21 used in the power trading system 10.

[0020] The cloud server 21 includes a control device 41, a communication device 42, and a storage device 43. The control device 41 is composed of a hardware processor including a CPU, and executes power trading processing between the user 22 and the aggregator 23 by reading a control program stored in the storage device 43. The control device 41 is provided with an acquisition unit 41a, a first determination unit 41b, a second determination unit 41c, and a trading processing unit 41d as functional units for realizing this system.

[0021] The acquisition unit 41a acquires information necessary for power trading processing from the user 22 and the aggregator 23, respectively. Specifically, the acquisition unit 41a acquires the power amount P1 of the storage battery 37, the power amount P2 required for the usage plan of the storage battery 37, the selling electricity prices U-S1, U-S2, U-S3, the buying electricity prices U-B1, U-B2, U-B3, the selling electricity priority a or b, and the buying electricity priority c or d through the power control device 24 on the user side.

[0022] "Power amount P1" refers to the current remaining capacity (SoC: State Of Charge) of the storage battery 37. "Power amount P2" refers to the power amount required to achieve the usage plan of the storage battery 37, that is, the necessary power amount based on the usage plan of the storage battery 37. For example, it refers to the power amount corresponding to the planned driving distance when using an electric vehicle in plans such as commuting or traveling.

[0023] "Selling electricity prices U-S1, U-S2, U-S3" are the prices serving as thresholds when the user 22 sells the power of the storage battery 37. At least two or more prices are set step by step according to the intention of the user 22 (U-S1 < U-S2 < U-S3). For example, when the price is greater than or equal to "selling electricity prices U-S1, U-S2, U-S3", it indicates that the user 22 sells the power of the storage battery 37. "Buying electricity prices U-B1, U-B2, U-B3" are the prices serving as thresholds when the user 22 buys electricity. At least two or more prices are set step by step according to the intention of the user 22 (U-B1 < U-B2 < U-B3). For example, when the price is less than or equal to "buying electricity prices U-B1, U-B2, U-B3", it indicates that the user 22 buys electricity.

[0024] "Selling electricity priority a or b" is the priority information set as the condition when giving priority to selling electricity over the usage plan. Selling electricity priority a > selling electricity priority b. Selling electricity priority a is set when it is desired to give priority to selling electricity even if the usage plan is not achieved. Selling electricity priority b is set when it is desired to give priority to selling electricity even if a more important usage plan is not achieved.

[0025] "Buying electricity priority c or d" is the priority information set as the condition when giving priority to buying electricity to achieve the usage plan. Buying electricity priority c > buying electricity priority d. Buying electricity priority c is set when it is desired to give priority to buying electricity to achieve an important usage plan. Buying electricity priority d is set when it is desired to give priority to buying electricity to achieve a more important usage plan.

[0026] Further, the acquisition unit 41a acquires the power purchase price A-B1 and the power selling price A-S1 through the power control device 25 on the aggregator side. The "power purchase price A-B1" is the price when the aggregator 23 purchases power from the user 22. The "power selling price A-S1" is the price (retail price) when the aggregator 23 supplies power to the user 22.

[0027] The first determination unit 41b determines the magnitude relationship between the power amount P1 of the storage battery 37 held by the user 22 and the power amount P2 required for the usage plan of the storage battery 37. The second determination unit 41c determines the magnitude relationship between the power selling prices U-S1, U-S2, U-S3 set by the user 22 and the power purchase price A-B1 set by the aggregator 23, or the magnitude relationship between the power purchase prices U-B1, U-B2, U-B3 set by the user 22 and the power selling price A-S1 set by the aggregator 23.

[0028] Based on the results of the first determination unit 41b and the second determination unit 41c, the transaction processing unit 41d performs power transaction processing between the user 22 and the aggregator 23. The "power transaction processing" includes a power selling process in which the user 22 discharges the power of the storage battery 37 held by the user 22 and sells it to the aggregator 23, and a power purchase process in which the user 22 purchases the power provided by the aggregator 23 and charges the storage battery 37.

[0029] The communication device 42 consists of a communication device having a predetermined communication protocol, and performs communication processing between the user 22 and the aggregator 23 and communication processing with the cloud server 11 which is an external server.

[0030] The storage device 43 consists of a memory device such as a ROM and a RAM, and stores various data necessary for the processing of the control device 41 and a control program related to the power transaction between the user 22 and the aggregator 23. Further, a first database (DB) 44 and a second database (DB) 45 are provided in the storage device 43.

[0031] As shown in FIG. 4, in the first database 44, the power amount P1 of the storage battery 37 acquired by the acquisition unit 41a, the power amount P2 required for the usage plan, the selling electricity prices U-S1, U-S2, U-S3, the buying electricity prices U-B1, U-B2, U-B3, and the priority information (selling electricity priorities a or b, buying electricity priorities c or d) are stored in association with unique identification information (user ID) for each user. As shown in FIG. 5, in the second database 45, the buying electricity price A-B1 and the selling electricity price A-S1 of the aggregator 23 acquired by the acquisition unit 41a are stored. The selling electricity prices U-S1, U-S2, U-S3 and the buying electricity prices U-B1, U-B2, U-B3 only need to be stored or input by the time of the determination by the second determination unit 41c, and may be before or after the determination by the first determination unit 41a.

[0032] (Hardware Configuration) FIG. 6 is a diagram showing an example of the hardware configuration of the cloud server 12. The cloud server 12 includes, as hardware components, a CPU 101, a non-volatile memory 102, a main memory 103, a communication device 104, and the like.

[0033] The CPU 101 is a hardware processor that controls the operation of the control device 41 shown in FIG. 3. The CPU 101 executes various programs loaded from the non-volatile memory 102, which is a storage device, to the main memory 103. Programs executed by the CPU 101 include, in addition to an operating system (OS), a program (hereinafter referred to as a power trading program) 103a for executing the processing operations shown in the flowcharts of FIGS. 7 and 8.

[0034] The acquisition unit 41a, the first determination unit 41b, the first determination unit 41b, the second determination unit 41c, and the transaction processing unit 41d shown in FIG. 3 are realized by causing the CPU 101, which is a computer, to execute the power trading program 103a. This power trading program 103a may be stored in a computer-readable recording medium and distributed, or may be downloaded to another computer through a network. Note that part or all of the acquisition unit 41a, the first determination unit 41b, the first determination unit 41b, the second determination unit 41c, and the transaction processing unit 41d may be realized by hardware such as an IC (Integrated Circuit), or may be realized as a combined configuration of the software and the hardware.

[0035] The non-volatile memory 102 and the main memory 103 correspond to the storage device 43 shown in FIG. 3. The communication device 104 is a device configured to execute communication with an external device, for example, by wire or wirelessly, and corresponds to the communication device 42 in FIG. 3.

[0036] The same applies to the cloud server 11, which is an external server shown in FIG. 1, and includes a hardware processor 11a. The hardware processor 11a has a program for stabilizing the power grid, monitors the power generated in the microgrids 1, 2, 3... N, and stabilizes the power grid.

[0037] Next, assuming that the storage battery 37 is mounted on an electric vehicle, the operation of the power trading system 10 in the present embodiment will be described. The power control device 24 shown in FIG. 2 is installed at the parking location of an electric vehicle (for example, within the premises of a house or at a charging station, etc.). Also, if the power control device 24 has a function enabling wireless charging and discharging, it may be installed, for example, at the installation location of an ETC (Electronic Toll Collection System). In this case, every time an electric vehicle passes through the installation location of the ETC, the power control device 24 detects the current power amount P1 of the storage battery 37 and transmits it to the cloud server 21, and can perform wireless discharging or charging according to the instructions from the cloud server 21.

[0038] (a) Initial setting FIG. 7 is a flowchart showing the processing operation at the initial setting of the power trading system 10. The processing shown in this flowchart is realized by the CPU 101 of the control device 41 provided in the cloud server 21, that is, a computer, reading the above-described power trading program 103a.

[0039] First, as an initial setting, the control device 41 (CPU 101) provided in the cloud server 21 acquires information necessary for power trading from the power control device 24 on the user side and the power control device 25 on the aggregator side.

[0040] Specifically, the control device 41 acquires the current power amount P1 of the storage battery 37 that is the object of power trading and the power amount P2 required for the usage plan of the storage battery 37 from the power control device 24 via the communication network NT2 (steps S11 - S12). Since the power amount P1 of the storage battery 37 varies depending on the usage state of the storage battery 37, it is preferably acquired, for example, in time units. The power amount P2 required for the usage plan is acquired at the timing when the user 22 inputs the usage plan by a predetermined operation. The usage plan includes information such as the date and time when the storage battery 37 is used and the planned driving distance. The calculation of the power amount P2 (the power amount required for the planned driving distance) required for the usage plan may be performed on the user side (power control device 24) or on the server side (control device 41).

[0041] In addition, when no usage plan is set, the amount of power required for the electric vehicle equipped with the storage battery 37 to travel to the nearest charging station may be determined as the amount of power required for the usage plan. When the storage battery 37 is installed in a building such as a house or a facility, the basic power consumption of the building may be determined as the amount of power required for the usage plan.

[0042] Subsequently, the control device 41 acquires the selling price and the buying price arbitrarily set by the user 22 through a predetermined operation from the power control device 24 via the communication network NT2 (steps S13 - S14). The selling price and the buying price can be set at least two or more prices according to the intention of the user 22. When the user 22 changes the price setting, the control device 41 acquires the changed price and reflects it in the first database 44.

[0043] Now, assume that three prices are set for the selling price and the buying price as follows. Selling price: U - S1 < U - S2 < U - S3 Buying price: U - B1 < U - B2 < U - B3

[0044] The selling price U - S1 has a margin in the amount of power P1 of the storage battery 37 and is the price when selling electricity without affecting the usage plan, and is set as a standard price. In contrast, the selling price U - S2 is the price when it is desired to prioritize selling electricity even if the usage plan is not met, and is set higher than the standard price. The selling price U - S3 is the price when it is desired to prioritize selling electricity even if an important usage plan is not met, and is set even higher than the standard price. The user 22 sets the selling priority a or b when it is desired to prioritize selling electricity over the usage plan.

[0045] The purchase electricity price U-B1 is the price when purchasing electricity to achieve the usage plan when the power amount P1 of the storage battery 37 is insufficient, and it is set to the standard price. In contrast, the purchase electricity price U-B2 is the price when purchasing electricity to achieve an important usage plan, and it is set higher than the standard price. The purchase electricity price U-B3 is the price when purchasing electricity to achieve an even more important usage plan, and it is set even higher than the standard price. The user 22 sets the purchase electricity priority c or d according to the importance of the usage plan.

[0046] In this way, when a plurality of prices are set for the selling electricity price and the purchase electricity price respectively, the control device 41 acquires the selling electricity priority a or b and the purchase electricity priority c or d from the power control device 24 via the communication network NT2 as the conditions of these prices (step S15). As will be described later, when the selling electricity priorities a and b are not set, the selling electricity process is carried out at the selling electricity price U-S1. When the selling electricity priority a is set, the power transaction is carried out at the selling electricity price U-S2. When the selling electricity priority b is set, the selling electricity process is carried out at the selling electricity price U-S3. When the purchase electricity priorities c and d are not set, the purchase electricity process is carried out at the purchase electricity price U-B1. When the purchase electricity priority c is set, the purchase electricity process is carried out at the purchase electricity price U-B2. When the purchase electricity priority d is set, the purchase electricity process is carried out at the purchase electricity price U-B3.

[0047] In this way, when various information necessary for the power transaction of the user 22 is obtained, the control device 41 stores this information in the first database 44 in association with the identification information (user ID) unique to the user 22 (step S16).

[0048] In addition, as various information necessary for the power transaction of the aggregator 23, the control device 41 acquires the power purchase price A-B1 and the power selling price A-S1 from the power control device 25 (step S17). The power purchase price A-B1 and the power selling price A-S1 are set in consideration of the market price of electric power. The control device 41 stores the power purchase price A-B1 and the power selling price A-S1 acquired from the power control device 25 in the second database 45 (step S17). When the power purchase price A-B1 or the power selling price A-S1 is changed, the control device 41 acquires the changed price and reflects it in the second database 45.

[0049] (b) Power transaction FIGS. 8 and 9 are flowcharts showing the processing operations during the power transaction of the power transaction system 10. Similar to the processing at the initial setting, the processing shown in this flowchart is realized by the CPU 101 of the control device 41 provided in the cloud server 21, that is, a computer, reading the above-described power transaction program 103a. With various information necessary for the power transaction registered in the first database 44 and the second database 45, the control device 41 performs the following processing related to the power transaction (power selling processing / power purchase processing).

[0050] That is, first, the control device 41 reads out the current power amount P1 of the storage battery 37 and the power amount P2 required for the usage plan from the first database 44 (steps S21 - S22), and determines the magnitude relationship between the two (step S23).

[0051] If P1 > P2, that is, when the power amount P1 of the storage battery 37 is more than the required power amount P2 in the usage plan and selling power will not affect the usage plan (Yes in step S23), the control device 41 reads out the power purchase price A-B1 of the aggregator 23 from the second database 45 and the first power selling price U-S1 of the user 22 from the first database 44 (steps S24 - S25), and determines the magnitude relationship between the two (step S26).

[0052] When A - B1 > U - S1, that is, when the power purchase price A - B1 of the aggregator 23 is higher than the first power selling price U - S1 of the user 22 (Yes in step S26), the control device 41 performs a power selling process at the first power selling price U - S1 (step S27).

[0053] Specifically, the control device 41 outputs a discharge command to the power control device 24 on the user side and outputs a charge command to the power control device 25 on the aggregator side. As a result, the power stored in the storage battery 37 is discharged and supplied to the aggregator 23 via the power line constructed between the user 22 and the aggregator 23. The discharge amount at this time is such that the power amount P1 of the storage battery 37 does not fall below the power amount P2 required for the usage plan. That is, it discharges with the difference (P1 - P2) between the power amount P1 and the power amount P2 as the threshold value. The aggregator 23 purchases the discharged power at the first power selling price U - S1. Regarding the money transaction between the user 22 and the aggregator 23, including the power selling price and the power purchase price, for example, a virtual currency using blockchain technology may be used.

[0054] When A - B1 ≤ U - S1, that is, when the power purchase price A - B1 of the aggregator 23 is less than or equal to the first power selling price U - S1 of the user 22 (No in step S26), the control device 41 holds the power selling process until the power purchase price A - B1 of the aggregator 23 rises above the first power selling price U - S1 (step S28). In this case, for example, due to factors such as weather, if the power shortage state continues and the demand of the aggregator 23 to purchase the power of the user 22 increases, that is, if the power purchase price A - B1 of the aggregator 23 rises above the current level, the power selling process will be performed in step S27.

[0055] In step S26, when P1 ≤ P2, that is, when the power amount P1 of the storage battery 37 is less than or equal to the required power amount P2 in the usage plan (No in step S23), the control device 41 refers to the first database 44 to determine whether the power selling priority a or b is set (step S29). When the power selling priority a or b is set (Yes in step S29), even if the usage plan is not achieved, the power selling process is carried out. In this case, the second power selling price U-S2 or the third power selling price U-S3 set higher than the first power selling price U-S1 is used for the power selling process.

[0056] When the power selling priority a is set (Yes in step S30), the control device 41 reads out the second power selling price U-S2 from the first database 44 (step S31) and compares it with the power buying price A-B1 of the aggregator 23 (step S32). As a result, when A-B1 > U-S2, that is, when the power buying price A-B1 of the aggregator 23 is higher than the second power selling price U-S2 of the user 22 (Yes in step S26), the control device 41 carries out the power selling process at the second power selling price U-S2 (step S33).

[0057] Specifically, assuming that the usage plan is not achieved, the control device 41 outputs a discharge command to the power control device 24 on the user side and a charge command to the power control device 25 on the aggregator side. Thereby, the power stored in the storage battery 37 is discharged and supplied to the aggregator 23 via the power line constructed between the user 22 and the aggregator 23. The discharge amount at this time may be all of the power amount P1 of the storage battery 37 or a part thereof. For example, the discharge amount may be set in advance, such as discharging up to 1 / 2 or 1 / 3 of the current amount. The aggregator 23 buys the discharged power at the second power selling price U-S2.

[0058] When A - B1 ≤ U - S2, that is, when the power purchase price A - B1 of the aggregator 23 is less than or equal to the second power selling price U - S2 of the user 22 (No in step S32), the control device 41 holds the power selling process until the power purchase price A - B1 of the aggregator 23 rises above the second power selling price U - S2 (step S34).

[0059] Also, when the power selling priority b is set (No in step S30), the control device 41 reads the third power selling price U - S3 from the first database 44 (step S35) and compares it with the power purchase price A - B1 of the aggregator 23 (step S36). As a result, when A - B1 > U - S3, that is, when the power purchase price A - B1 of the aggregator 23 is higher than the third power selling price U - S3 of the user 22 (Yes in step S36), the control device 41 performs the power selling process at the third power selling price U - S3 (step S37).

[0060] Specifically, on the premise that a more important usage plan will not be fulfilled, the control device 41 outputs a discharge command to the power control device 24 on the user side and a charge command to the power control device 25 on the aggregator side. Thereby, the power stored in the storage battery 37 is discharged and supplied to the aggregator 23 via the power line constructed between the user 22 and the aggregator 23. Similar to the case of the power selling priority a, the discharge amount at this time may be all or part of the power amount P1 of the storage battery 37. In this case, since the purchase price of the aggregator 23 is high, it may be discharged more than in the case of the power selling priority a. The aggregator 23 purchases the discharged power at the third power selling price U - S3.

[0061] When A - B1 ≤ U - S3, that is, when the power purchase price A - B1 of the aggregator 23 is less than or equal to the third power selling price U - S3 of the user 22 (No in step S36), the control device 41 holds the power selling process until the power purchase price A - B1 of the aggregator 23 rises above the third power selling price U - S3 (step S38).

[0062] On the other hand, in step S29, if the power selling priorities a and b are not set (No in step S29), the following power buying process is performed. That is, when P1 ≤ P2 (No in step S23), if the power selling priorities a and b are not set (No in step S29), the control device 41 reads out the power selling price A-S1 of the aggregator 23 from the second database 45 and the first power buying price U-B1 of the user 22 from the first database 44 (steps S41 - S42), and determines the magnitude relationship between the two (step S43).

[0063] When A-S1 < U-B1, that is, when the power selling price A-S1 of the aggregator 23 is lower than the first power buying price U-B1 of the user 22 (Yes in step S43), the control device 41 performs the power buying process at the first power buying price U-B1 (step S44).

[0064] Specifically, the control device 41 outputs a charging command to the power control device 24 on the user side and outputs a discharging command to the power control device 25 on the aggregator side. As a result, the power provided by the aggregator 23 is supplied to the user 22 via the power line constructed between the user 22 and the aggregator 23. The charging amount at this time (the amount of power bought from the aggregator 23) is at least the amount that satisfies the power P2 required for the usage plan (P2 - P1). The user 22 purchases the power provided by the aggregator 23 at the first power buying price U-B1.

[0065] When A - S1 ≧ U - B1, that is, when the selling electricity price A - S1 of the aggregator 23 is greater than or equal to the first buying electricity price U - B1 of the user 22 (No in step S43), the control device 41 refers to the first database 44 and determines whether the buying electricity priority c or d is set (step S45). If the buying electricity priorities c and d are not set (No in step S45), the control device 41 suspends the buying electricity process until the selling electricity price A - S1 of the aggregator 23 decreases (step S46). In this case, for example, if the surplus power of solar power generation during the day increases and the aggregator 23 has a higher demand to buy electricity from the user 22, that is, if the selling electricity price A - S1 of the aggregator 23 decreases from the current level, the buying electricity process will be carried out in step S44.

[0066] In step S45, when the buying electricity priority c or d is set, in order to achieve the usage plan, the buying electricity process is carried out. In this case, the second buying electricity price U - B2 or the third buying electricity price U - B3 set higher than the first buying electricity price U - B1 is used for the buying electricity process.

[0067] When the buying electricity priority c is set (Yes in step S47), the control device 41 reads out the second buying electricity price U - B2 from the first database 44 (step S48) and compares it with the selling electricity price A - S1 of the aggregator 23 (step S49). As a result, when A - S1 < U - B2, that is, when the selling electricity price A - S1 of the aggregator 23 is lower than the second buying electricity price U - B2 of the user 22 (Yes in step S49), the control device 41 carries out the buying electricity process at the second buying electricity price U - B2 (step S50).

[0068] Specifically, on the premise of achieving an important usage plan, the control device 41 outputs a charging command to the user-side power control device 24 and a discharging command to the aggregator-side power control device 25. Thereby, the power provided by the aggregator 23 is supplied to the user 22 via the power line constructed between the user 22 and the aggregator 23. The charging amount at this time (the amount of power purchased from the aggregator 23) is at least sufficient to satisfy the power P2 required for the usage plan (P2 - P1). In this case, depending on the importance of the usage plan, charging may be increased more than when the power purchase priorities c and d are not set. The user 22 purchases the power required for charging at the second power purchase price U - B2.

[0069] When A - S1 ≥ U - B2, that is, when the selling price A - S1 of the aggregator 23 is greater than or equal to the second power purchase price U - B2 of the user 22 (No in step S32), the control device 41 suspends the power purchase process until the selling price A - S1 of the aggregator 23 drops below the second power purchase price U - B2 (step S51).

[0070] Also, when the power purchase priority d is set (No in step S47), the control device 41 reads the third selling price U - B3 from the first database 44 (step S52) and compares it with the selling price A - S1 of the aggregator 23 (step S53). As a result, when A - S1 < U - B3, that is, when the selling price A - S1 of the aggregator 23 is lower than the third power purchase price U - B3 of the user 22 (Yes in step S53), the control device 41 performs the power purchase process at the third power purchase price U - B3 (step S54).

[0071] Specifically, on the premise of achieving a more important usage plan, the control device 41 outputs a charging command to the user-side power control device 24 and outputs a discharging command to the aggregator-side power control device 25 (step S54). As a result, the power provided by the aggregator 23 is supplied to the user 22 via the power line constructed between the user 22 and the aggregator 23. The charging amount at this time (the amount of power purchased from the aggregator 23) is at least sufficient to satisfy the power P2 required for the usage plan (P2 - P1). In this case, depending on the importance of the usage plan, charging may be increased more than when the power purchase priority c is not set. The user 22 purchases the power required for charging at the third power purchase price U - B3.

[0072] When A - S1 ≧ U - B3, that is, when the selling price A - S1 of the aggregator 23 is greater than or equal to the third power purchase price U - B3 of the user 22 (No in step S53), the control device 41 holds the power purchase process until the selling price A - S1 of the aggregator 23 drops below the third power purchase price U - B3 (step S55).

[0073] Thus, according to this embodiment, by setting a plurality of selling prices according to the intention of the user 22, when the selling price of the aggregator 23 that varies due to weather or the like matches the selling price of the user 22, the power of the storage battery 37 can be sold at that selling price. Regarding the power purchase price as well, by setting a plurality of power purchase prices, when the power purchase price set by the aggregator 23 matches the power purchase price of the user 22, power can be purchased from the aggregator 23 at that power purchase price.

[0074] The power transaction as described above is automatically performed by this system without the user 22 being particularly aware of it. Therefore, knowledge about power transactions is not required. When there is excess power in the storage battery 37, profits can be obtained through selling power, which can be used for maintenance costs of the storage battery 37 and the like. Therefore, it can be expected that more users will utilize this system, contributing to the popularization of electric vehicles and the improvement of environmental problems.

[0075] In the above embodiment, the case of setting three prices for the selling electricity price has been described as an example. However, more prices may be set in detail and switched appropriately based on the selling electricity priority for use in power trading. The same applies to the buying electricity price. The case of setting three prices has been described as an example, but more prices may be set in detail and switched appropriately based on the buying electricity price priority for use in power trading.

[0076] Also, on the cloud server 21 side, for example, the power trading results of the user 22 are aggregated monthly, and a power trading result screen 50 as shown in FIG. 10 is sent to the power control device 24 of the user 22 and displayed on the display device 35. The power trading result screen 50 has information 51 regarding selling electricity and information 52 regarding buying electricity. The user 22 can confirm the relationship between selling electricity and buying electricity on a monthly basis through this power trading result screen 50. Generally, private cars are often used on holidays and are in a parked state on weekdays and at night. Therefore, especially when there is no specific usage plan and the private car is parked, profit can be obtained by selling the power of the battery during that period, and it can also contribute to the improvement of environmental problems.

[0077] For example, the same applies to other moving bodies such as buses, motorcycles, ships, airplanes, drones, etc. If these moving bodies are equipped with batteries, the power of the batteries can be effectively utilized by this system. Furthermore, the same applies to batteries installed in a stationary type in buildings such as houses and facilities. The power of the batteries can be effectively utilized by this system.

[0078] In short, as long as it is a battery owned by the user, including the battery installed in the electric vehicle, this system can be applied to all of them. Without the user's awareness, power trading can be easily carried out using the battery, profit can be obtained from surplus power, and it can contribute to the realization of a decarbonized society.

[0079] Also, as shown in FIG. 1, since this system includes a cloud server 11 for stabilizing the power grid as an external server, even when multiple users 1, 2, 3... M frequently exchange power of the storage battery using this system, the power grid can be stabilized by power adjustment on the cloud server 11 side.

[0080] According to at least one of the embodiments described above, it is possible to provide a power trading system that can effectively utilize the power of storage batteries owned by users, including the storage battery mounted on an electric vehicle, to conduct power trading.

[0081] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and its equivalent scope.

Description of Reference Numerals

[0082] 10... Power trading system, 11... Cloud server (external server), 21... Cloud server, 22... User, 23... Aggregator, 24... Power control device, 25... Power control device, 31... Control device, 32... Storage device, 33... Communication unit, 34... Input device, 35... Display device, 36... Charge / discharge device, 37... Storage battery, 38... Target device, 41... Control device, 42... Communication device, 43... Storage device, 44... First database, 45... Second database.

Claims

1. A first determination means for determining the magnitude relationship between the amount of power of the storage battery and the required amount of power based on the usage plan of the storage battery; A second determination means for determining the magnitude relationship between the selling price set by the user who owns the storage battery as the selling price and the buying price set by the aggregator, or the magnitude relationship between the buying price set by the user as the buying price and the selling price set by the aggregator; A transaction processing means for performing a power transaction process between the user and the aggregator based on the results of the first determination means and the second determination means; comprising: The power transaction process includes a power selling process of discharging the power of the storage battery and selling it to the aggregator, and a power buying process of buying the power provided by the aggregator and charging the storage battery; The transaction processing means is: When the amount of power of the storage battery is more than the required amount of power in the usage plan, comparing the buying price set by the aggregator with the first selling price set by the user, and performing the power selling process when the buying price of the aggregator is higher than the first selling price; When the amount of power of the storage battery is less than or equal to the required amount of power in the usage plan, If the buying price of the aggregator is higher than a second selling price set higher than the first selling price, a power trading system that performs the power selling process according to a preset first power selling priority.

2. The transaction processing means is: If the buying price of the aggregator is higher than a third selling price set even higher than the second selling price, the power selling process is performed according to a preset second power selling priority; The first power selling priority and the second power selling priority are set as conditions for giving priority to power selling over the usage plan; The power trading system according to claim 1, wherein the first power selling priority is higher than the second power selling priority.

3. The transaction processing means: When the power purchase price of the aggregator is less than or equal to the first power selling price, hold the power selling process until the power purchase price of the aggregator increases, The power trading system according to claim 1, wherein when the power purchase price of the aggregator becomes higher than the first power selling price, the power selling process is performed.

4. The transaction processing means: When the power purchase price of the aggregator is less than or equal to the second power selling price, hold the power selling process until the power purchase price of the aggregator increases, The power trading system according to claim 1, wherein when the power purchase price of the aggregator becomes higher than the second power selling price, the power selling process is performed.

5. The transaction processing means: When the power purchase price of the aggregator is less than or equal to the third power selling price, hold the power selling process until the power purchase price of the aggregator increases, The power trading system according to claim 2, wherein when the power purchase price of the aggregator becomes higher than the third power selling price, the power selling process is performed.

6. The transaction processing means: When the power amount of the storage battery is less than or equal to the power amount required by the usage plan, and the first power selling priority and the second power selling priority are not set, Compare the power selling price set by the aggregator with the first power purchase price set by the user, and perform the power purchase process when the power selling price of the aggregator is lower than the first power purchase price. The power trading system according to claim 2.

7. The transaction processing means: If the power selling price of the aggregator is lower than the second power purchase price set higher than the first power purchase price, perform the power purchase process according to the preset first power purchase priority. The power trading system according to claim 6.

8. The transaction processing means if the selling electricity price of the aggregator is lower than a third buying electricity price set even higher than the second buying electricity price, implements the buying electricity process according to a preset second buying electricity priority. The first buying electricity priority and the second buying electricity priority are set as conditions for prioritizing buying electricity to achieve the usage plan. The first buying electricity priority has a higher priority than the second buying electricity priority. The power trading system according to claim 7.

9. The transaction processing means when the selling electricity price of the aggregator is equal to or higher than the first buying electricity price, holds the buying electricity process until the selling electricity price of the aggregator drops, and implements the buying electricity process when the selling electricity price of the aggregator becomes lower than the first buying electricity price. The power trading system according to claim 6.

10. The transaction processing means when the selling electricity price of the aggregator is equal to or higher than the second buying electricity price, holds the buying electricity process until the selling electricity price of the aggregator drops, and implements the buying electricity process when the selling electricity price of the aggregator becomes lower than the second buying electricity price. The power trading system according to claim 7.

11. The transaction processing means when the selling electricity price of the aggregator is equal to or higher than the third buying electricity price, holds the buying electricity process until the selling electricity price of the aggregator drops, and implements the buying electricity process when the selling electricity price of the aggregator becomes lower than the third buying electricity price. The power trading system according to claim 8.

12. The transaction processing means when the usage plan is not set, obtains the amount of electric power required for the mobile body equipped with the storage battery to travel to the nearest charging station as the amount of electric power required for the usage plan. The power trading system according to claim 1.

13. The transaction processing means, When the usage plan is not set, the basic power consumption of the building where the storage battery is installed is obtained as the power required for the usage plan. The power trading system according to claim 1.

14. A server connected via a communication network to a first power control device that controls the power of the storage battery and a second power control device that controls the power managed by the aggregator, The server, Obtains the amount of power of the storage battery, the amount of power required for the usage plan of the storage battery, the selling price or buying price set by the user from the first power control device, and stores them in a first database in association with the identification information of the user. Obtains the buying price or selling price set by the aggregator from the second power control device and stores it in a second database. Based on the amount of power of the storage battery stored in the first database, the amount of power required for the usage plan, the selling price or buying price of the user, and the buying price or selling price of the aggregator stored in the second database, the power trading process between the user and the aggregator is carried out. The power trading system according to claim 1.

15. The server, Is connected via a communication network to an external server having a function of stabilizing the power system. The power trading system according to claim 14.

16. A program executed by a computer, The computer is A first determination means for determining the magnitude relationship between the amount of power of the storage battery and the required amount of power based on the usage plan of the storage battery, A second determination means for determining the magnitude relationship between the selling price set by the user who owns the storage battery as the selling price and the buying price set by the aggregator, or the magnitude relationship between the buying price set by the user as the buying price and the selling price set by the aggregator. Transaction processing means for performing power transaction processing between the user and the aggregator based on the results of the first determination means and the second determination means function as The power transaction processing includes a power selling process of discharging the power of the storage battery and selling it to the aggregator, and a power buying process of buying the power provided by the aggregator and charging the storage battery. The transaction processing means When the amount of power in the storage battery is more than the amount of power required in the usage plan Compare the power purchase price set by the aggregator with the first power selling price set by the user, and perform the power selling process when the aggregator's power purchase price is higher than the first power selling price. When the amount of power in the storage battery is less than or equal to the amount of power required in the usage plan A program for performing the power selling process according to a preset first power selling priority if the aggregator's power purchase price is higher than a second power selling price set higher than the first power selling price.

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