Power supply and demand management system and power supply and demand management method

Abstract

To promote transactions of renewable energy.SOLUTION: A power demand and supply management system comprises: a receiving unit 71 that receives, through communication, a supply bid for renewable energy power from a renewable energy power supply side, and a demand bid for renewable energy power from a renewable energy power demand side; a matching unit 72 that performs matching of the received supply bid and demand bid; an issuing unit 73 that, as a result of the matching, when a charge-discharge system capable of charging and discharging power receives the renewable energy power as the demand side, issues a correctable time section power certificate indicating that renewable energy received power being the renewable energy power to be received is derived from renewable energy; and a storage unit 74 that stores the time section power certificate issued by the issuing unit 73. The issuing unit 73 describes, on the time section power certificate, a power use time section indicating a date and a time zone when the renewable energy power is received.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a power supply and demand management system and a power supply and demand management method. [Background Art]

[0002] As a background art in the present technical field, there is Japanese Patent Application Laid-Open No. 2011-164700 (Patent Document 1). This publication describes that "the green power supply and demand certification device of the present invention compares power transmission performance information (power transmission completion report) transmitted from a power transmission source that transmits green power with power reception performance information (power reception completion report) transmitted from a power transmission destination that receives green power from the power transmission source, and includes a power transmission / reception completion report verification unit that verifies whether there is consistency, and a supply and demand information processing unit that associates the power transmission performance information and the power reception performance information determined to be consistent by the power transmission / reception completion report verification unit, and generates supply and demand information including the power transmission source, the power transmission destination, and the amount of transmitted / received green power" (see the abstract).

[0003] As another background art, there is Japanese Patent Application Laid-Open No. 2011-175556 (Patent Document 2). This publication describes that "there is provided a power trading server comprising: a first certificate acquisition unit that acquires, from a first user who desires to sell power, a first certificate for certifying the stored power amount of a first power storage means owned by the first user; a second certificate acquisition unit that acquires, from a second user who desires to purchase power, a second certificate for certifying the free capacity of a second power storage means owned by the second user; a power sale limiting unit that limits the amount of power that can be sold by the first user to the stored power amount of the first power storage means based on the first certificate acquired by the first certificate acquisition unit; and a power purchase limiting unit that limits the amount of power that can be purchased by the second user to the free capacity of the second power storage means based on the second certificate acquired by the second certificate acquisition unit" (see the abstract). [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2011-164700 [Patent Document 2] Japanese Patent Publication No. 2011-175556 [Overview of the project] [Problems that the invention aims to solve]

[0005] Patent documents 1 and 2 disclose systems for trading electricity. However, the technologies described in patent documents 1 and 2 had room for improvement from the standpoint of promoting the trading of renewable energy. Therefore, the object of the present invention is to provide a power supply and demand management system and a power supply and demand management method that can facilitate the trading of renewable energy. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a system comprising: a receiving unit that receives supply bids for renewable energy electricity from the supply side and demand bids for renewable energy electricity from the demand side via communication; a matching unit that matches the received supply bids and demand bids; an issuing unit that, as a result of the matching, issues a modifiable certificate indicating that the renewable energy electricity received is of renewable energy origin when a charge / discharge system capable of charging and discharging electricity receives renewable energy electricity as the demand side; and a storage unit that stores the certificate issued by the issuing unit, wherein the issuing unit includes a power usage time classification indicating the date and time and time period when the renewable energy electricity was received in the certificate. [Effects of the Invention]

[0007] According to the present invention, it is possible to facilitate the trading of renewable energy. Other issues, configurations, and effects not mentioned above will be clarified by the following description of the embodiments. [Brief explanation of the drawing]

[0008] [Figure 1] A block diagram showing the overall system configuration according to Example 1. [Figure 2] A block diagram showing the hardware configuration of the power supply and demand management system. [Figure 3] A functional block diagram illustrating the functions performed by the power supply and demand management device. [Figure 4A] A diagram showing an example of electricity supply bidding data. [Figure 4B] A diagram showing an example of electricity demand bidding data. [Figure 5] A diagram showing an example of electricity supply and demand contract data. [Figure 6A] A diagram showing an example of power supply data. [Figure 6B] A diagram showing an example of electricity demand data. [Figure 7A] A diagram showing an example of a renewable time-segment power certificate. [Figure 7B] A diagram showing an example of a time-segment power certificate that cannot be renewed. [Figure 8] A block diagram showing the data stored in the auxiliary storage device 54 of the power supply and demand management system. [Figure 9A] An example of a power generation supply and demand contract sequence diagram. [Figure 9B] An example of a power generation supply and demand sequence diagram. [Figure 10A] An example of a supply and demand contract sequence diagram for discharged power between a charging / discharging system and a power demand system. [Figure 10B] An example of a power supply and demand sequence diagram for discharged power between a charging / discharging system and a power demand system. [Figure 11] A flowchart illustrating the power supply and demand management procedure for a power supply and demand management system. [Figure 12] A block diagram showing the overall system configuration according to Example 2. [Figure 13A] An example of a sequence diagram for measuring electricity supply and demand with power supply supplementation. [Figure 13B] An example sequence diagram for electricity supply and demand settlement with electricity supply compensation. [Figure 14A] An example sequence diagram for measuring power supply and demand with power demand compensation. [Figure 14B] An example sequence diagram for power supply and demand settlement with power demand compensation. [Figure 15A] An example sequence diagram of a supply and demand contract for discharge power between different charge and discharge systems. [Figure 15B] An example sequence diagram of supply and demand for discharge power between different charge and discharge systems. DESCRIPTION OF EMBODIMENTS

[0009] Hereinafter, a plurality of examples of embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0010] FIG. 1 is a block diagram showing the overall system configuration according to a first embodiment. As shown in FIG. 1, the system of the first embodiment includes: a renewable power supply system 10 (supply side) that supplies renewable energy power; a non-renewable power supply system 20 (supply side) that supplies non-renewable energy power; a power demand system 30 (demand side) that consumes power; and a charge and discharge system 40 that charges and discharges power, which acts as both a supply side and a demand side. A power supply and demand management system 1 manages the supply and demand of power within the system. The power supply and demand management system 1 includes: a power supply and demand management device 50, which is a core device that manages power supply and demand within the system; and a distributed ledger system (backup device) 60 that backs up and stores data such as time-segment power certificates (certificates) 500 and 550 (FIG. 7A, FIG. 7B) stored in the power supply and demand management device 50.

[0011] The power supply and demand management device 50, the renewable power supply system 10, the non-renewable power supply system 20, the power demand system 30, and the charging / discharging system 40 are all connected to each other via a communication network 110 such as the Internet. The power supply and demand management device 50 and the distributed ledger system 60 are also connected to each other via the communication network 110. Typically, multiple units of each of the renewable power supply system 10, the non-renewable power supply system 20, the power demand system 30, and the charging / discharging system 40 are connected to the power supply and demand management device 50 in a communication manner.

[0012] The renewable power supply system 10 includes a renewable power supply device 12 that generates renewable energy electricity such as solar power generators, wind power generators, tidal power generators, and geothermal power generators, and a renewable power supply control computer 11 that controls the renewable power supply device 12. The renewable power supply control computer 11 accesses the power supply and demand management device 50 via a communication network 110 and conducts power supply bidding and the like. The non-renewable power supply system 20 includes a non-renewable power supply device 22 that generates non-renewable energy electricity from, for example, fossil fuels or nuclear power, and a non-renewable power supply control computer 21 that controls the non-renewable power supply device 22. The non-renewable power supply control computer 21 accesses the power supply and demand management device 50 via a communication network 110 and conducts power supply bidding and the like.

[0013] The power demand system 30 includes, for example, a power demand device 32 that consumes power, such as a machine tool, and a power demand control computer 31 which controls the power demand device 32. The power demand control computer 31 accesses the power supply and demand management device 50 via a communication network 110 and conducts power demand bidding and the like. The charge / discharge system 40 includes, for example, a charge / discharge device 42 capable of charging and discharging power from a battery, and a charge / discharge control computer 41, which is a computer that controls the charge / discharge device 42. The charge / discharge control computer 41 accesses the power supply and demand management device 50 via a communication network 110 to conduct power demand bidding and supply bidding, etc.

[0014] Although not shown in the diagram, the distributed ledger system 60 consists of multiple data recording nodes, each node recording and holding identical data. This distributed ledger system is constructed using, for example, blockchain technology. The renewable power supply device 12, the non-renewable power supply device 22, the power demand device 32, and the charge / discharge device 42 can exchange power with each other via the power network 120, which is a power transmission and distribution network.

[0015] Next, the operational overview of the system in Example 1 will be described. The renewable power supply system 10 bids for power supply to the power supply and demand management device 50 via the communication network 110 in order to sell renewable energy electricity. If a supply and demand contract is concluded, the renewable power supply system 10 supplies renewable energy electricity via the power network 120. The renewable power supply system 10 also measures the amount of renewable energy electricity supplied and notifies the power supply and demand management device 50.

[0016] The non-renewable power supply system 20 bids for the supply of non-renewable energy to the power supply and demand management device 50 via the communication network 110 in order to sell non-renewable energy electricity. If a supply and demand contract is concluded, the non-renewable power supply system 20 supplies non-renewable energy electricity via the power network 120. The non-renewable power supply system 20 also measures the amount of non-renewable energy electricity supplied and notifies the power supply and demand management device 50. The power demand system 30 submits a bid for power demand to the power supply and demand management device 50 via the communication network 110 in order to obtain the necessary power. If a supply and demand contract is concluded, the power demand system 30 receives and consumes the contracted power. The power demand system 30 also measures the amount of power consumed and notifies the power supply and demand management device 50.

[0017] When the charging / discharging system 40 sells electricity through discharge, it submits a bid for electricity supply to the power supply management device 50 via the communication network 110. If a supply contract is concluded, the system supplies the contracted electricity. On the other hand, when the charging / discharging system 40 purchases electricity through charging, it submits a bid for electricity demand to the power supply management device 50. If a supply contract is concluded, the charging / discharging system 40 receives the contracted electricity. The charging / discharging system 40 also measures the amount of electricity supplied or received and notifies the power supply management device 50. The specifications for supply and demand bidding will be described later.

[0018] The power supply and demand management device 50 backs up the contents of the received power demand bids and supply bids to the distributed ledger system 60 via the communication network 110. The power supply and demand management device 50 also performs matching processing between the received power demand bids and supply bids. If the conditions match between the power supply bid and demand bid, the power supply and demand management device 50 concludes the supply and demand contract and notifies the system that submitted the power supply and demand bid of the conclusion of the contract. Furthermore, the power supply and demand management device 50 backs up the contents of the concluded supply and demand contract to the distributed ledger system 60 via the communication network 110. In addition, the power supply and demand management device 50 receives notifications of the amount of power supplied or consumed and records them to the distributed ledger system 60 via the communication network 110. In the supply and demand of renewable energy power, if the amount of supply and demand match the contracted amount, a certificate of renewable energy power use is issued to the system that consumed the power. Furthermore, when renewable energy is used for charging, a certificate of renewable energy use that can be modified (time-segmented power certificate 500 (see Figure 7A)) is issued, and when it is consumed, a certificate of renewable energy use that cannot be modified (time-segmented power certificate 550 (see Figure 7B)) is issued. In addition, the issued renewable energy use certificate data is backed up and recorded in the distributed ledger system 60.

[0019] The distributed ledger system 60 records and maintains received data such as electricity supply and demand bidding data, contract matching data, notification data regarding the amount of electricity supplied and demanded, and issued certification data for the use of renewable energy electricity.

[0020] Next, we will explain the system configuration of the power supply and demand management system 1 and the detailed operation of the system centered around the power supply and demand management system 1. Figure 2 is a block diagram showing the hardware configuration of the power supply and demand management device 50. As shown in Figure 2, the power supply and demand management device 50 includes a processor 51, a communication interface 52, a main memory 53, an auxiliary memory 54, an input / output interface 55, and a bus 56 that connects the above-mentioned modules in a communicative manner. The power supply and demand management device 50 may be a single computer such as a server, or multiple computers such as servers may work together to provide various functions.

[0021] The processor 51 is a central processing unit that controls the operation of each part of the power supply and demand management device 50. The processor 51 is, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or an ASIC (Application Specific Integrated Circuit). The processor 51 deploys the program 57 stored in the auxiliary storage device 54 into the working area of ​​the main memory device 53 in an executable format. The main memory device 53 stores the program executed by the processor 51, the data processed by the processor, etc. The main memory device 53 is, for example, flash memory, RAM (Random Access Memory), ROM (Read Only Memory), etc. The auxiliary storage device 54 stores various programs and various data. The auxiliary storage device 54 stores, for example, the OS (Operating System), various programs including program 57, various tables, etc. The auxiliary storage device 54 is a silicon disk containing non-volatile semiconductor memory (flash memory, EPROM (Erasable Programmable ROM)), a solid-state drive, a hard disk drive (HDD), etc. The program 57 may be downloaded from a predetermined location via the communication network 110 and set up in the auxiliary storage device 54, or the program 57 may be read from a predetermined storage medium that stores the program 57 and set up in the auxiliary storage device 54.

[0022] The communication interface 52 is an interface for enabling communication between each of the aforementioned systems and the power supply and demand management device 50 via the communication network 110. The input / output interface 55 receives operation instructions from an administrator who operates an input device connected to the input / output interface 55. Input devices include, for example, a keyboard, touch panel, mouse, and microphone. In addition, display devices such as LCDs, EL (Electroluminescence) panels, and organic EL panels, as well as output devices such as printers and speakers, can be connected to the input / output interface 55. The input / output interface 55 outputs data and information processed by the processor 51, and data and information stored in the main memory 53 and auxiliary memory 54, to the output devices.

[0023] The hardware configuration of the distributed ledger system 60 is the same as that of the power supply and demand management device 50, so it is omitted from the illustration and explanation here. Incidentally, the aforementioned Patent Documents 1 and 2 disclose a system for trading electricity. In the system of this embodiment 1, the power supply and demand management device 50 matches supply bids from the supply side, namely the renewable power supply system 10 and the non-renewable power supply system 20, with demand bids from the demand side, namely the electricity demand system 30, and concludes a power purchase and sale contract.

[0024] However, the technologies described in Patent Documents 1 and 2 have room for improvement from the standpoint of promoting the trading of renewable energy. Specifically, the generation of renewable energy electricity by the renewable power supply system 10 is dependent on natural conditions. For example, solar power generators cannot generate electricity at night, and the amount of electricity generated is also reduced on cloudy days. Similarly, wind power generators cannot generate electricity when there is no wind, and the amount of electricity generated is also reduced on light breezes. Thus, the renewable energy electricity generated by the renewable power supply system 10 is dependent on natural conditions. Therefore, if the renewable energy electricity supply system 10 is able to generate sufficient electricity, the charging and discharging system 40 is charged with renewable energy electricity (in this case, the charging and discharging system 40 is on the demand side), and if it is not able to generate electricity or the amount of electricity generated is low, the electricity is supplied from the charging and discharging system 40 to the electricity demand system 30 (in this case, the charging and discharging system 40 is on the supply side), the use of renewable energy electricity can be promoted.

[0025] However, if the electricity being charged in the charging / discharging system 40 is simply being charged, it is not clear whether it is renewable energy or non-renewable energy. Furthermore, even if the electricity being charged in the charging / discharging system 40 is renewable energy, measures are needed to facilitate its trading. The following describes in detail the processing performed by the power supply and demand management system 1, which facilitates the trading of renewable energy electricity stored in the charging and discharging system 40.

[0026] Figure 3 is a functional block diagram illustrating the functions performed by the power supply and demand management device 50. Based on the program 57 described above, the power supply and demand management device 50 executes the following functional units: reception unit 71, matching unit 72, issuance unit 73, storage unit 74, update unit 75, and evaluation unit 76. These functional units execute the following processes 1 to 4 (1) to (4).

[0027] (1) Process 1 The reception unit 71 receives supply bids for renewable energy electricity from the supply side (renewable energy supply system 10, charging / discharging system 40) and demand bids for renewable energy electricity from the demand side (electricity demand system 30, charging / discharging system 40) via communication on the communication network 110 (reception process). The matching unit 72 matches supply bids and demand bids received by the reception unit 71 (matching process). The issuing unit 73, as a result of this matching, issues a modifiable certificate (time-segmented power certificate 500 (Figure 7A)) indicating that the renewable energy power received is derived from renewable energy when the charge / discharge system 40, which is capable of charging and discharging power, receives renewable energy power as a demand side (issuance process). The storage unit 74 stores the certificates issued by the issuing unit 73 (such as the time-segmented power certificate 500) (storage step). The issuing unit 73 then records the power usage time classification 507, which indicates the date and time and time period during which renewable energy power was received, on the certificate (time classification power certificate 500) (issuance process).

[0028] (2) Process 2 The update unit 75, based on the matching results in the matching unit 72, updates the certificate (time-segmented power certificate 500) corresponding to the renewable energy power being supplied to the demand side when the charge / discharge system 40 supplies the renewable energy power being charged to the demand side as the supply side, making it impossible to modify (update process).

[0029] (3) Process 3 When the reception unit 71 receives supply bids from the charging / discharging system 40, it receives a certificate (time-segmented power certificate 500) or a certificate identification mark (certificate ID 503) from the charging / discharging system 40 (reception process). Then, the evaluation unit 76 evaluates whether the charging / discharging system 40 is capable of supplying renewable energy power based on the certificate (time-segmented power certificate 500) or identification mark (certification ID 503) received by the reception unit 71 (evaluation step). Furthermore, if the evaluation unit 76 determines that the charging / discharging system 40 is capable of supplying renewable energy power, the reception unit 71 accepts a supply bid from the charging / discharging system 40 (reception process). In this case, the evaluation unit 76 performs the evaluation based on the amount of power that is naturally discharged according to the time difference between the time when the charging / discharging system 40 receives renewable energy power and the time when it supplies renewable energy power, by subtracting this amount from the amount of power that can be supplied (evaluation step).

[0030] (4) Process 4 The issuing unit 73, based on the matching results in the matching unit 72, records the available power supply amount 512, which indicates the amount of renewable energy power that can be supplied from the charging / discharging system 40, on a certificate (time-segmented power certificate 500) when the charging / discharging system 40 receives renewable energy power as a demand side (issuance process). In this case, the issuing unit 73 sets the available power supply amount 512 to a value calculated based on the charge-discharge efficiency with respect to the amount of electricity received by the charge-discharge system 40 from renewable energy (issuance process). Furthermore, the available power supply of 512 is less than the amount of electricity received from renewable energy sources.

[0031] The following sections will provide a detailed explanation of the specific implementation processes for Processes 1 through 4. Figure 4 shows an example of power supply and demand bidding data in Example 1. Figure 4A shows an example of power supply bidding data, and Figure 4B shows an example of power demand bidding data. Power suppliers submit supply bids by presenting power supply bidding data, and power demanders submit demand bids by presenting power demand bidding data. This data is stored in the power supply and demand management device 50.

[0032] In Figure 4A, the power supply bidding data 210 consists of the following fields: Management ID (Identifier) ​​201, which is an identification mark that identifies each application; Date 202, on which power supply is possible; Time slot 203, which is the time period during which power supply is possible; Supply side ID 204, which is an identification mark that identifies the supply side system; Renewable energy degree (205), which indicates the percentage of electricity generated by renewable energy out of the total amount of electricity that can be supplied; Power source type 206; Electricity price 207, which is the lower limit; Amount of electricity to be supplied 208; and Certification ID 209, which is an identification mark that indicates ownership of renewable energy electricity.

[0033] The power supply bid S1 shown in line 211 indicates that the power supply date is February 1, 2022, the supply time slot is 15 minutes from 10:00 to 10:14, the ID of the power supplying system is 10, the renewable energy content of the supplied power is 100%, the power source type is photovoltaic (PV), the minimum power price is 20 yen / kWh, the amount of power supplied is 100kWh, and there is no certification ID indicating ownership of renewable energy power. It also indicates that for renewable energy power supplied from a system capable of generating renewable energy power, such as renewable energy power supply system 10, a certification ID indicating ownership of renewable energy power is not required and bidding is possible.

[0034] The power supply bid S2 shown in line 212 indicates that the power supply date is February 1, 2022, the supply time slot is 15 minutes from 19:00 to 19:14, the ID of the power supply system is 40, the renewable energy content is 100%, the power source type is photovoltaic (PV), the minimum electricity price is 25 yen / kWh, the amount of electricity to be supplied is 50kWh, and the certification ID indicating ownership of renewable energy is SPC-1. It also indicates that if the power supply system is a system that is not capable of generating renewable energy, for example, in the case of renewable energy supply from a charging / discharging system 40, a certification ID indicating ownership of renewable energy relative to the amount of electricity to be supplied is required for the bid.

[0035] The power supply bid S3 shown in line 213 has a similar configuration. If the supplying system is a renewable power supply system 10, the renewable energy content of the supplied power will be 100%. On the other hand, if the supplying system is a non-renewable power supply system 20, the renewable energy content of the supplied power will be 0%. Furthermore, if the supplying system is a charge / discharge system 40, it can charge both renewable and non-renewable energy power, and the renewable energy content of the supplied power can be set from 0% to 100%.

[0036] In Figure 4B, the electricity demand bidding data 260 consists of the following fields: management ID 251, which is an identification mark for each application; date 252, on which electricity consumption is possible; time slot 253, on which electricity consumption is possible; demand-side ID 254, which is an identification mark for the demand-side system; renewable energy percentage 255, which indicates the percentage of electricity generated by renewable energy in the amount of electricity consumed; power source type 256; electricity price 257, which is an upper limit; and amount of electricity consumed 258.

[0037] The electricity demand bid D1 shown in row 261 indicates that the electricity demand date is February 1, 2022, the supply time slot is 15 minutes from 10:00 to 10:14, the ID of the system using the electricity is 40, the desired renewable energy level is 100%, the power source type is solar power (PV), the upper limit electricity price is 20 yen / kWh, and the amount of electricity to be consumed (charged) is 100kWh. Electricity demand bids D2 and D3, shown in lines 262 and 263, have a similar structure.

[0038] In this embodiment 1, the time slots 203 and 253 for power supply and demand were explained using 15 minutes as an example, but other values, such as 5 minutes or other time units, may be specified. Also, the power price 257 was explained as the price per kWh, but other price specifications, such as the price per Wh, may be used. Furthermore, the system consuming the power can set the renewable energy percentage from 0% to 100% in the power demand bidding.

[0039] Figure 5 shows an example of power supply contract data in Embodiment 1. When the matching unit 72 matches the demand bid and supply bid and a power supply contract is concluded, the power supply contract data 310 is recorded in the power supply management device 50. The power supply and demand contract data 310 consists of the following fields: a management ID 301 which is an identification marker for each contract; a date 302 on which power supply and demand is possible; a time slot 303 which is the time period during which power supply and demand is possible; a supply-side ID 304 for the supply-side system; a demand-side ID 305 for the demand-side system; a renewable energy degree 306; a power source type 307; a contracted power price 308; and a contracted amount of electricity 309.

[0040] Contract C1, shown in line 311, indicates that the date of electricity supply and demand is February 1, 2022, the time slot is 15 minutes from 10:00 to 10:14, the supply-side ID of the supplying system is 10, the demand-side ID of the demanding system is 40, the renewable energy percentage is 100%, the power source type is solar power (PV), the contracted electricity price is 20 yen / kWh, and the electricity amount is 100kWh. Contracts C2 and C3, shown in lines 312 and 313, have similar configurations.

[0041] Figure 6 shows an example of notification data for the amount of electricity supplied and consumed in Example 1. Figure 6A is an example of electricity supply data, and Figure 6B is an example of electricity demand data. When electricity is exchanged between the demand side and the supply side based on the electricity supply contract data 310, electricity supply data is transmitted from the supply side and electricity demand data is transmitted from the demand side to the electricity supply management device 50, and the electricity supply management device 50 stores this data.

[0042] In Figure 6A, the power supply data 410 consists of the following fields: management ID 401, which is an identification mark for each contract; date 402, when power was supplied; time slot 403, which indicates the time when power was supplied; supplier ID 404, which is an identification mark for the supplying system; renewable energy level 405; power source (type) 406; power price 407; and amount of power supplied 408. The power supply data RS1 shown in row 411 indicates that the power supply date was February 1, 2022, the time slot was 15 minutes from 10:00 to 10:14, the supplying system ID was 10, the renewable energy percentage was 100%, the power source type was photovoltaic (PV), the electricity price was 20 yen / kWh, and the amount of electricity supplied was 100kWh. The power supply data RS2 and RS3 shown in rows 412 and 413 have a similar structure.

[0043] In Figure 6B, the electricity demand data 460 consists of the following fields: management ID 451, which is an identification mark that identifies individual contracts; date 452, when electricity was supplied; time slot 453, which indicates the time when electricity was supplied; identification mark ID 454, which identifies the demand-side system; renewable energy content of the consumed electricity 455; power source (type) 456; electricity price 457; and amount of electricity consumed (or charged) 458. The electricity demand data RD1 shown in row 461 indicates that the date of electricity demand is February 1, 2022, the time slot is 15 minutes from 10:00 to 10:14, the demand-side system ID is 40, the renewable energy percentage is 100%, the power source type is solar power (PV), the electricity price is 20 yen / kWh, and the amount of electricity consumed (charged) is 100kWh. The electricity supply data RS2 and RS3 shown in rows 462 and 463 have a similar structure.

[0044] Figure 7 shows an example of a time-segmented power certificate issued during power consumption (charging) in Example 1. Time-segmented power certificates 500 and 550 are issued as certificates of use of renewable energy power, according to the amount of electricity supplied, when the time slot on the supply side and the time slot on the demand side are the same. Figure 7A shows an example of a time-segmented power certificate issued during power charging (receiving) in the charge / discharge system 40, and Figure 7B shows an example of a time-segmented power certificate issued when power supplied from the charge / discharge system 40 is consumed on the demand side.

[0045] The time-segmented power certificate 500 shown in Figure 7A includes the fields for the date and time of issuance of the certificate 501, the owner of the certificate 502 (identification marks such as name and ID), and the certificate ID 503, which is the identification mark of the certificate. The time-segmented power certificate 500 also includes the reference certificate ID 504, which is the certificate ID 503, etc., of the original time-segmented power certificate 500 from which the certificate is inherited (when renewable energy power indicated by a time-segmented power certificate 500 is divided and supplied, a new time-segmented power certificate 500 is issued for the divided power, and the certificate ID 503, etc., of the original time-segmented power certificate 500 is recorded). The time-segmented power certificate 500 also includes the supply-side system ID 505, which is the identification mark of the power supply-side system, and the demand-side system ID 506, which is the identification mark of the power demand-side system.

[0046] Furthermore, the time-segmented power certificate 500 also includes a field for power usage time segment 507, which is the date and time (time slot) when renewable energy power was supplied (power supplied to the charging / discharging system 40). In addition, the time-segmented power certificate 500 also includes fields for reference time segment 508, which is the date and time (time slot) when the original renewable energy power supply and demand indicated by reference certificate ID 504 took place, and renewable energy degree 509 in the supplied power.

[0047] Furthermore, the time-segmented power certificate 500 also includes fields for power source type 510 (differences in power source, such as solar power generation or wind power generation), power consumption amount 511 (amount of power used), and available power supply amount 512 (amount of power that the charge / discharge system 40 can supply when it is charging). The available power supply amount 512 is a value set based on the charge / discharge efficiency when the charge / discharge system 40 receives and discharges renewable energy power. The available power supply amount 512 limits the amount of renewable energy power that can be supplied from the charge / discharge system 40 to that amount.

[0048] Furthermore, the time-segment power certificate 500 also includes fields for renewal eligibility 513 (yes or no) indicating whether the certificate can be renewed, and certification status 514 (valid or invalid) indicating whether the certificate is valid or not.

[0049] In the time-segmented power certificate 500 shown in Figure 7A, the issuance date and time 501 is 10:20 on February 1, 2022, the owner of the power in question 502 is Batter-1, and the certificate ID 503 is SPC-1. Furthermore, there is no reference certificate ID 504, indicating that the power in question was obtained through the supply and demand of directly generated renewable energy power. The supply-side system ID 505 is 10, the demand-side system ID 506 is 40, the power usage time segment 507 using renewable energy power is from 10:00 to 10:14 on February 1, 2022, and there is no reference time segment 508. It also indicates that the renewable energy content of the power used is 100%, the power source type is solar power generation (PV), the amount of power used (charged) 511 is 100kWh, and the amount of power that can be supplied by discharge 512 is 90kWh. Here, the amount of electricity used 511 is 100kWh, but because the charge / discharge efficiency of this charge / discharge system 40 is 90%, the amount of electricity that can be supplied by discharge 512 is limited to 90kWh. Furthermore, when supplying power by discharge from the charge / discharge system 40 using the time-segment power certificate 500, if there is a difference in time between the time slot in which the power was charged and the time slot in which the power is supplied by discharge, it is possible to supply power up to a value that takes into account natural discharge at a predetermined ratio, for example, 5% over 30 days. The renewal status 513 of the time-segment power certificate 500 is set to "Yes," indicating that the charge / discharge system 40 is capable of supplying power by discharge to the demand side. In addition, the certification status 514 is set to "Valid," indicating that the time-segment power certificate 500 is valid.

[0050] The time-segmented power certificate 550 shown in Figure 7B is created in the update unit 75 by updating the time-segmented power certificate 500 corresponding to the renewable energy power being supplied when the charge / discharge system 40 supplies renewable energy power that it is charging as the supply side to the demand side, based on the matching results in the matching unit 72.

[0051] In the Time-Segmented Power Certificate 550, the issuance date and time 501 is 19:20 on February 1, 2022, the owner of the power in question 502 is Demand-1, and the main certificate ID 503 is SPC-1-1. Furthermore, the reference certificate ID 504 is SPC-1, indicating that renewable energy power was supplied and demanded by discharge from the charge / discharge system 40. In this example, the renewable energy power indicated by SPC-1 in the reference certificate ID 504 is the original power, which is then divided and a portion of it is supplied, and the Time-Segmented Power Certificate 550 is issued for the consumption of the divided renewable energy power, with the number SPC-1-1 assigned as the main certificate ID 503 for that power. Therefore, the sub-number "-1" is assigned to SPC-1 in the reference certificate ID 504 indicating the original power, and the main certificate ID 503 for the divided power is SPC-1-1. Furthermore, the supply-side system ID 505 is 40, the demand-side system ID 506 is 30, the time period 507 for electricity usage using renewable energy is February 1, 2022, from 19:00 to 19:14, and the reference time period 508 is February 1, 2022, from 10:00 to 10:14. The renewable energy percentage 509 of the electricity used is 100%, the power source type 510 is solar power generation (PV), the amount of electricity used (consumed) 511 is 50kWh, and the amount of electricity that can be supplied by discharge is 0kWh (no more electricity can be supplied). Furthermore, the renewal feasibility 513 is set to "not possible", indicating that electricity supply by discharge is not possible. In addition, the certification status 514 is set to "valid", indicating that the time period electricity certificate 550 is valid.

[0052] In this embodiment 1, we described the case where the renewable energy percentage of 509 is 100%. However, when other values ​​are used, such as 70%, if 100kWh of electricity is used, 70kWh will be the amount of renewable energy used.

[0053] Figure 8 is a block diagram showing the data stored in the auxiliary storage device 54 (Figure 2) of the power supply and demand management device 50. The auxiliary storage device 54 holds power supply bid data 210 (Figure 4A), power demand bid data 260 (Figure 4B), power supply contract data 310 (Figure 5), power supply amount data 410 (Figure 6A), power demand amount data 460 (Figure 6B), and time-segmented power certificate data 156 (data for time-segmented power certificates 500 (Figure 7A) and time-segmented power certificates 550 (Figure 7B)), which are necessary for the execution of program 57. Power supply bid data 210 is a list of power supply bids. Power demand bid data 152 is a list of power demand bids. Yes. Power supply contract data 310 is a list of data on established power supply contracts. Power supply amount data 410 is a list of data on measured power supply amounts. Power demand amount data 460 is a list of data on measured power demand amounts. Time-segment power certificate data 156 is a list of data that proves that renewable energy power was used for a specific time segment (time slot) on a specific date. Deposit and withdrawal data 157 is a list of data on withdrawals and deposits when settlement processing is performed in power supply and demand.

[0054] Figure 9 shows an example of a supply and demand contract and supply and demand sequence diagram for generated power in Example 1. Figure 9A is an example of a supply and demand contract sequence diagram for generated power, and Figure 9B is an example of a supply and demand sequence diagram for generated power.

[0055] In Figure 9A, first, the renewable power supply system 10 registers its identification ID and power generation capacity with the power supply and demand management device 50 as a power generation system capable of supplying renewable energy electricity in order to participate in power supply and demand trading (step S601). This registration only needs to be done once. The charge / discharge system 40 also participates in electricity supply and demand trading, and as a charge / discharge system capable of charging and discharging electricity, it registers its identification ID and charge / discharge capacity with the electricity supply and demand management device 50 (step S602). This registration only needs to be done once.

[0056] The renewable power supply system 10 submits a supply bid for renewable energy electricity that is expected to be available to the power supply and demand management device 50 (step S603). For the power supply bid data 210, the data shown in row 211 of Figure 4A is used for the bid. In the power supply and demand management device 50, the evaluation unit 76 determines whether renewable energy power can be supplied based on the contents of the received power supply bid data 210. If there are no problems, the reception unit 71 accepts the supply bid, and the storage unit 74 stores the power supply bid data 210 (Figure 8) (step S604). The storage unit 74 also requests the distributed ledger system 60 to store a backup of the power supply bid data 210 (step S605).

[0057] The distributed ledger system 60 performs backup storage of the received power supply bid data 210 (step S606). The charging and discharging system 40 submits a demand bid for the required renewable energy electricity to the power supply and demand management device 50 (step S607). For the demand bid data, the power demand bid data 260 shown in row 261 of Figure 4B is used to make the bid. In the power supply and demand management device 50, the evaluation unit 76 confirms that the received power demand bidding data 260 is from the charge / discharge system 40. If there are no problems, the reception unit 71 accepts the power demand bidding data 260, and the storage unit 74 stores the power demand bidding data 260 (Figure 8) (step S608). The storage unit 74 also requests the distributed ledger system 60 to store a backup of the power demand bidding data 260 (step S609).

[0058] The distributed ledger system 60 performs backup storage of the received power demand bidding data 260 (step S610). In the power supply and demand management device 50, the matching unit 72 determines whether the conditions match between the power supply bid and the power demand bid. If there are matching supply and demand bids, a power supply and demand contract is concluded (step S611). At this time, the power supply and demand contract data 310 is stored in the power supply and demand management device 50 by the storage unit 74 (Figure 8). The storage unit 74 also requests the distributed ledger system 60 to back up the concluded power supply and demand contract data 310 if a supply and demand contract has been concluded (step S612). For example, the data shown in row 311 of Figure 5 is used as the concluded power supply and demand contract data 310.

[0059] The distributed ledger system 60 performs backup storage of the received power supply contract data 310 (step S613). The power supply and demand management device 50 notifies the renewable power supply system 10 that a contract for power supply bidding has been concluded (step S614). The power supply and demand management device 50 also notifies the charging and discharging system 40 that a contract for power demand bidding has been concluded (step S615).

[0060] Following the conclusion of this power supply contract, in Figure 9B, when the power supply time (step S620) indicated by the concluded contract arrives, the renewable power supply system 10 supplies renewable energy power, and the charging / discharging system 40 charges the supplied power (step S621). The renewable power supply system 10 measures the amount of electricity supplied (step S622). The renewable power supply system 10 also notifies the power supply and demand management device 50 of the data regarding the measured amount of electricity (step S623). For example, the power supply data 410 shown in row 411 of Figure 6A is used to notify the amount of electricity supplied.

[0061] The storage unit 74 stores the received power supply data 410 (Figure 8) and requests the distributed ledger system 60 to store a backup of the received power supply data 410 (step S624). The distributed ledger system 60 performs backup storage of the received power supply data 410 (step S625). The charging and discharging system 40 measures the amount of electricity charged (step S626). The charging and discharging system 40 also notifies the power supply and demand management device 50 of the measured amount of renewable energy electricity (step S627). For example, the power demand data 460 shown in row 461 of Figure 6B is used to notify the amount of electricity charged.

[0062] The storage unit 74 stores the received power demand data 460 and requests the distributed ledger system 60 to store a backup of the received power demand data 460 (step S628). The distributed ledger system 60 performs backup storage of the received power demand data 460 (step S629). The evaluation unit 76 confirms the consistency between the amount of renewable energy electricity supplied and the amount of renewable energy electricity charged (supply and demand) for the established supply and demand contract (step S630). If there are no problems with the consistency of supply and demand for renewable energy electricity, the power supply and demand management device 50 notifies the renewable energy supply system 10 of the settlement decision (step S631). Specifically, it notifies the system of the payment decision for the amount of renewable energy electricity supplied (unit price × supply amount). The power supply and demand management device 50 also notifies the charge / discharge system 40 of the settlement decision (step S632). Specifically, it notifies the system of the payment request for the amount of renewable energy electricity charged (unit price × supply amount).

[0063] The power supply and demand management device 50 performs payment settlement to the renewable power supply system 10 according to the determined settlement amount (step S633). The storage unit 74 also stores the payment settlement data (deposit and withdrawal data 157 (Figure 8)) to the renewable power supply system 10 and requests the distributed ledger system 60 to store a backup of the payment settlement data (deposit and withdrawal data 157) to the renewable power supply system 10 (step S634). The distributed ledger system 60 stores a backup of the payment settlement data (income and expenditure data 157) received for the renewable power supply system 10 (step S635).

[0064] The charging and discharging system 40 makes a payment to the power supply and demand management device 50 according to the determined settlement amount (step S636). The memory unit 74 stores the deposit and settlement data (deposit and withdrawal data 157 (Figure 8)) from the charge and discharge system 40 and requests the distributed ledger system 60 to store a backup of the deposit and settlement data (deposit and withdrawal data 157) from the charge and discharge system 40 (step S637). The distributed ledger system 60 backs up and stores the deposit settlement data (deposit and withdrawal data 157) received from the charge / discharge system 40 (step S638).

[0065] Once the payment settlement from the charge / discharge system 40 is complete, the issuing unit 73 issues a time-segmented power certificate 500 (Figure 7A) for the amount of renewable energy power charged by the charge / discharge system 40. The storage unit 74 stores this certificate and requests backup storage in the distributed ledger system 60 (step S639). This time-segmented power certificate 500 was issued for the charging of renewable energy power by the charge / discharge system 40, and "Yes" is specified as the update feasibility 513 (Figure 7A) to indicate that the charge / discharge system 40 is capable of supplying renewable energy power through discharge. In addition, to indicate that the power that can be supplied by discharge in the charge / discharge system 40 is renewable energy power, fields for renewable energy degree 509 and power source type 510 are provided, where the percentage of renewable energy degree and the type of power source are recorded, respectively. Furthermore, the power usage time segment 507 field shows the date and time (time slot) when the charge / discharge system 40 received renewable energy power. The memory unit 74 stores this time-segmented power certificate 500 (time-segmented power certificate data 156 in Figure 8) and requests the distributed ledger system 60 to store a backup of it (step S639).

[0066] The distributed ledger system 60 backs up and stores the received time-segmented power certificates 500 (step S640). The power supply and demand management device 50 notifies the charging and discharging system 40 of the main certification ID 503 of the issued time-segment power certificate 500 (step S641). The charging / discharging system 40 holds the original certification ID 503 of the received time-segmented power certificate 500 (step S642).

[0067] In this embodiment 1, settlement processing was performed between the renewable power supply system 10 and the charge / discharge system 40 via the power supply and demand management device 50, but these two systems may also perform settlement processing directly. Furthermore, in this embodiment 1, the power supply and demand management device 50 managed the details of the time-segmented power certificate 500 issued to the charge / discharge system 40 and notified the charge / discharge system 40 of the main certification ID 503 of the issued time-segmented power certificate 500. In contrast to this method, the power supply and demand management device 50 may provide the details of the time-segmented power certificate 500 issued to the charge / discharge system 40, and the power supply and demand management device 50 may manage the main certification ID 503 of the issued time-segmented power certificate 500.

[0068] Figure 10 shows an example of a supply and demand contract and supply and demand sequence diagram for discharge power in Example 1. Figure 10A shows an example of a supply and demand contract sequence diagram for discharge power between the charge / discharge system 40 and the power demand system 30. Figure 10B shows an example of a supply and demand sequence diagram for discharge power between the charge / discharge system 40 and the power demand system 30.

[0069] In Figure 10A, first, the power demand system 30 registers its ID and power consumption specifications with the power supply management device 50 as a power consumption system in order to participate in power supply and demand trading (step S701). This registration only needs to be done once. The charging and discharging system 40 submits a supply bid to the power supply and demand management device 50 for renewable energy electricity (100% renewable energy) that it wishes to sell (step S702). For the power supply bid data, the power supply bid data 210 shown in row 212 of Figure 4A is used for the bid. In this supply bid, since the charging and discharging system 40 does not directly generate renewable energy electricity, it is necessary to demonstrate that it is capable of supplying renewable energy electricity (i.e., not non-renewable energy). Specifically, the charging and discharging system 40 must demonstrate that it has charged renewable energy electricity prior to this supply bid and is therefore holding renewable energy electricity. For this reason, the charging and discharging system 40 submits a power supply bid including the main certification ID 503 of the time-segmented power certificate 500, which demonstrates that it is holding renewable energy electricity.

[0070] The evaluation unit 76 determines whether renewable energy power can be supplied based on the contents of the received power supply bid data 210. If there are no problems, the reception unit 71 receives the power supply bid data 210 along with the main certification ID 503 of the time-segmented power certificate 500, and the storage unit 74 stores it (Figure 8) (step S703). In this supply bid, the power supply bid is made including the main certification ID 503 of the time-segmented power certificate 500, which indicates that the charge / discharge system 40 holds renewable energy power, and the evaluation unit 76 has determined that renewable energy power can be supplied. For example, if the amount of power to be supplied is 50kWh, and according to the time-segmented power certificate 500, it is possible to charge 100kWh and supply up to 90kWh, the evaluation unit 76 has determined this based on the amount of power used 511 and the amount of power that can be supplied 512 of the time-segmented power certificate 500. Furthermore, the evaluation unit 76 determines that even if the time difference between the charging time slot and the scheduled supply time slot is, for example, 9 hours, and even after subtracting the amount of natural discharge (e.g., a 5% reduction over 30 days), it is still possible to supply 50 kWh of renewable energy electricity.

[0071] Furthermore, the storage unit 74 requests the distributed ledger system 60 to store a backup of the power supply bidding data 210 (step S704). The distributed ledger system 60 performs backup storage of the received power supply bid data 210 (step S705). The power demand system 30 submits a demand bid for the required renewable energy electricity (100% renewable energy) to the power supply and demand management device 50 (step S706). For the power demand bid data, the power demand bid data 260 shown in row 262 of Figure 4B is used to make the bid.

[0072] In the power supply and demand management device 50, the evaluation unit 76 confirms that the received power demand bid data 260 is for power consumption from the power demand system 30. If there are no problems, the reception unit 71 accepts the power demand bid data 260, and the storage unit 74 stores it (Figure 8) (step S707). The storage unit 74 also requests the distributed ledger system 60 to store a backup of the power demand bid data 260 (step S708). The distributed ledger system 60 performs backup storage of the received power demand bidding data 260 (step S709).

[0073] The matching unit 72 determines whether the conditions match between the electricity supply bid and the electricity demand bid (matching), and if there are matching supply bids and demand bids, it concludes an electricity supply and demand contract (step S710). The storage unit 74 also stores the concluded electricity supply and demand contract data 310 (Figure 5) (Figure 8) if an electricity supply and demand contract has been concluded, and requests the distributed ledger system 60 to store a backup of the electricity supply and demand contract data 310 (step S711).

[0074] The distributed ledger system 60 performs backup storage of the received power supply contract data 310 (step S712). The power supply and demand management device 50 notifies the charging and discharging system 40 that a contract for power supply bidding has been concluded (step S713). The power supply and demand management device 50 also notifies the power demand system 30 that a contract for power demand bidding has been concluded (step S714).

[0075] In Figure 10B, when the time for the power supply and demand contract established in the aforementioned contract (step S720) arrives, the charging and discharging system 40 supplies renewable energy power, and the power demand system 30 consumes the supplied power (step S721). In this case, the amount of renewable energy power supplied from the charging and discharging system 40 cannot exceed the amount of power that can be supplied 512 of the time-segmented power certificate 500. As mentioned above, the amount of power that can be supplied 512 is the amount of power obtained by subtracting the amount of power used 511, which is the amount of power the charging and discharging system 40 receives, taking into account the charging and discharging efficiency.

[0076] The charging and discharging system 40 measures the amount of electricity supplied (step S722). The charging and discharging system 40 also notifies the power supply and demand management device 50 of the data regarding the measured amount of electricity (step S723). For example, the power supply data 410 shown in row 412 of Figure 6A is used to notify the amount of electricity supplied. The storage unit 74 stores the received power supply data 410 (Figure 8) and requests the distributed ledger system 60 to store a backup of the received power supply data 410 (step S724).

[0077] The distributed ledger system 60 records the received power supply data 410 (step S725). The power demand system 30 measures the amount of electricity consumed (step S726). The power demand system 30 also notifies the power supply management device 50 of the power demand data 460 related to the measured amount of electricity (step S727). For example, the power demand data 460 shown in row 462 of Figure 6B is used to notify the amount of electricity consumed.

[0078] The storage unit 74 stores the power demand data 460 (Figure 8) and requests the distributed ledger system 60 to store a backup of the power demand data 460 (step S728). The distributed ledger system 60 performs backup storage of the received power demand data 460 (step S729). The evaluation unit 76 confirms the consistency between the amount of renewable energy electricity supplied and the amount of renewable energy electricity consumed for the established electricity supply and demand contract (step S730). If there are no problems with the consistency of supply and demand for renewable energy electricity, the electricity supply and demand management device 50 notifies the charging and discharging system 40 of the settlement decision (step S731). Specifically, it notifies the payment decision for the amount of renewable energy electricity supplied (unit price × supply amount). The electricity supply and demand management device 50 also notifies the electricity demand system 30 of the settlement decision (step S732). Specifically, it notifies the payment request for the amount of renewable energy electricity consumed (unit price × demand amount).

[0079] The power supply and demand management device 50 performs payment settlement to the charging and discharging system 40 according to the determined settlement amount (step S733). The storage unit 74 also stores the payment settlement data (deposit and withdrawal data 157 (Figure 8)) for the charging and discharging system 40 and requests the distributed ledger system 60 to store a backup of the payment settlement data (deposit and withdrawal data 157) for the charging and discharging system 40 (step S734). The distributed ledger system 60 stores a backup of the payment settlement data (deposit and withdrawal data 157) received from the charging and discharging system 40 (step S735).

[0080] The power demand system 30 makes a payment settlement to the power supply and demand management device 50 according to the determined settlement amount (step S736). The memory unit 74 stores the deposit settlement data (deposit and withdrawal data 157) from the power demand system 30 and requests the distributed ledger system 60 to store a backup of the deposit settlement data (deposit and withdrawal data 157) from the power demand system 30 (step S737). The distributed ledger system 60 stores a backup of the deposit settlement data (deposit and withdrawal data 157) received from the power demand system 30 (step S738).

[0081] Once payment settlement from the power demand system 30 is complete, the update unit 75 updates the time-segmented power certificate 500 (Figure 7A) for the amount of renewable energy power consumed and issues a time-segmented power certificate 550 (Figure 7B). The storage unit 74 stores this (time-segmented power certificate data 156 in Figure 8) and also requests backup storage to the distributed ledger system 60 (step S739). Specifically, the time-segmented power certificate 550 is created to be provided to the power demand system 30 in a format that updates the time-segmented power certificate 500 presented by the charge / discharge system 40. The time-segmented power certificate 550 is issued for the consumption of renewable energy power by the power demand system 30, and to indicate that the supply of renewable energy power based on the time-segmented power certificate 550 is impossible, "impossible" is written as the renewal feasibility 513 (Figure 7B) of this certificate. Therefore, the description in the time-segmented power certificate 550 cannot be rewritten.

[0082] The distributed ledger system 60 performs backup storage to update the time-segment power certificate 500 before the update using the received time-segment power certificate 550 (step S740). The power supply and demand management device 50 notifies the charging and discharging system 40 that the time-segmented power certificate 500 it had been assigned has been updated (step S741). The power supply and demand management device 50 also notifies the power demand system 30 of the main certification ID 503 of the newly issued time-segmented power certificate 550 (step S742).

[0083] The power demand system 30 retains the main certification ID 503 of the received time-segment power certificate 550 (step S743). Alternatively, the system may receive and retain the data of the time-segment power certificate 550 instead of the main certification ID 503.

[0084] Figure 11 is a flowchart illustrating the power supply and demand management procedure of the power supply and demand management device 50. The power supply and demand management device 50 determines whether or not it has received a system registration for participating in power supply and demand trading from a power supply system, etc. (step S1011). In the determination in step S1011, if the power supply and demand management device 50 determines that it has received a system registration for participating in power supply and demand trading (Yes in step S1011), it performs the system registration (step S1012).

[0085] If, in the determination in step S1011, it is determined that no system registration for participating in electricity supply and demand trading has been received (No. in step S1011), or after executing step S1012, the reception unit 71 then determines whether or not it has received a supply or demand bid for electricity trading (step S1013). In the determination in step S1013, if the receiving unit 71 determines that it has received a bid to participate in electricity supply and demand trading, the evaluation unit 76 determines whether the sender is qualified to make the bid based on the received bid information. If there is no problem, the receiving unit 71 accepts the bid, the storage unit 74 stores the bid information, and requests backup storage to the distributed ledger system 60 (step S1014).

[0086] Next, the matching unit 72 determines whether there are any supply and demand bids that match the conditions between the power supply bids and the demand bids (matching) (step S1015). In the determination in step S1015, if it is determined that there is a supply and demand bid that meets the conditions (there is supply and demand matching) (Yes in step S1015), the matching unit 72 creates power supply and demand contract data 310 from the bid data that meets the conditions, stores it in the storage unit 74, and requests backup storage in the distributed ledger system 60 (step S1016). The power supply and demand management device 50 also notifies the systems on the demand and supply sides that have made supply and demand bids that meet the conditions of the result of the contract (step S1017).

[0087] If, in the determination in step S1013, it is determined that no bids for participating in electricity supply and demand trading have been received (Yes in step S1013), or if, in the determination in step S1015, it is determined that there are no supply and demand bids that meet the conditions (there is supply and demand matching) (No in step S1015), or after executing step S1017, the electricity supply and demand management device 50 determines whether or not it has received a notification regarding the measured amount of electricity supplied or the amount of electricity demanded (step S1018).

[0088] In the determination in step S1018, if the power supply and demand management device 50 determines that it has received a notification regarding the measured power supply amount or power demand amount (Yes in step S1018), the storage unit 74 stores the received notification data regarding the power supply amount or power demand amount (power supply amount data 410, power demand amount data 460) and backs it up to the distributed ledger system 60 (step S1019). Next, the power supply and demand management device 50 determines whether there is consistency between the received power supply amount or power demand amount and the power supply amount (step S1020).

[0089] In the determination in step S1020, if the power supply and demand management device 50 determines that there is consistency between the amount of power supplied and demanded (Yes in step S1020), it notifies the supplied power and demanded power of settlement (step S1021). If, in the determination in step S1018, it is determined that no notification regarding the measured amount of power supplied or the amount of power demand has been received (No. of step S1018), or if, in the determination in step S1020, it is determined that there is no consistency between the amount of power supplied and demanded (No. of step S1020), or after executing step S1021, the power supply and demand management device 50 determines whether a payment processing or a deposit processing is necessary as a settlement process (step S1022).

[0090] In the determination in step S1022, if it is determined that a withdrawal process is necessary as part of the settlement process, the withdrawal process is performed. If a deposit process is necessary, the deposit process is performed. The storage unit 74 stores the records of the executed deposits and withdrawals (deposit and withdrawal data 157), and also backs them up in the distributed ledger system 60 (step S1023). In the determination in step S1022, if it is determined that no withdrawal or deposit processing is necessary as part of the settlement process (No. in step S1022), or after executing step S1023, the issuing unit 73 determines whether or not it is necessary to issue a time-segmented power certificate 500 or a time-segmented power certificate 550 (the latter being issued upon renewal of the former) (step S1024).

[0091] In the determination in step S1024, if it is determined that a time-segmented power certificate 500 or time-segmented power certificate 550 needs to be issued, the issuing unit 73 or the updating unit 75 issues the time-segmented power certificate 500 or time-segmented power certificate 550, the storage unit 74 stores it, instructs the distributed ledger system to back it up, and notifies the demand-side system using renewable energy power of the main certification ID 503 of the time-segmented power certificate 500 or time-segmented power certificate 550.

[0092] In the determination in step S1024, if it is determined that it is not necessary to issue a time-segmented power certificate 500 or a time-segmented power certificate 550 (No. in step S1024), or after executing step S1025, the power supply and demand management device 50 determines whether it is the time to end power supply and demand management (the time to end power supply and demand transactions) (step S1026). If, in the determination in step S1026, it is determined that it is time to end the power supply and demand management (Yes in step S1026), the power supply and demand management device 50 terminates the power supply and demand management process (step S1027).

[0093] If, in the determination in step S1026, it is determined that it is not time to end power supply and demand management (No. in step S1026), the power supply and demand management device 50 returns to step S1011 and continues the power supply and demand management process.

[0094] According to the power supply and demand management system 1 of this embodiment 1 described above, the above-mentioned process 1 can be executed. Therefore, even when the charging and discharging system 40 is on the power supply side, it presents the time-segmented power certificate 500 (with its main certificate ID 503) and makes a supply bid. Furthermore, since the time-segmented power certificate 500 includes the date and time (time slot) in which the renewable energy power was received in the power usage time-segmentation 507 column, it is possible to reliably guarantee that the power that the charging and discharging system 40 is selling is derived from renewable energy. Therefore, the power supply and demand management system 1 can facilitate the trading of renewable energy electricity.

[0095] Furthermore, the power supply and demand management system 1 can execute the process 2 described above. Therefore, when renewable energy electricity is consumed on the demand side, the time-segmented power certificate 550 cannot be rewritten, thus preventing the misuse of the time-segmented power certificate 550 to falsely sell non-renewable energy electricity as renewable energy electricity.

[0096] Furthermore, the power supply and demand management system 1 can perform the aforementioned process 3. Therefore, the charging and discharging system 40 can reliably guarantee that the electricity put up for supply bidding is renewable energy, thereby increasing the security of renewable energy electricity trading.

[0097] Furthermore, the power supply and demand management system 1 can perform the aforementioned process 4. Therefore, it is possible to curb the trading of renewable energy electricity that cannot be supplied, and in this respect as well, the safety of trading renewable energy electricity can be enhanced.

[0098] Furthermore, according to the power supply and demand management system 1, the distributed ledger system 60 backs up and stores the time-segmented power certificates 500 and 550. Therefore, it is possible to back up the time-segmented power certificates 500 and 550 and to suppress their tampering. Thus, in this respect as well, the power supply and demand management system 1 can enhance the security of renewable energy electricity trading.

[0099] In this embodiment 1, we have described an example of matching power supply and demand for power supply bids and demand bids, using a time slot of 15 minutes and the case where the amount of power supplied and the amount of power demanded are the same. However, this embodiment 1 may also be applied to other cases where the amount of supply and demand are different, or where the time slots are different. For example, when the amount of power supplied and the amount of power demand are different, if the amount of power supplied is greater than the amount of power demanded, partial matching of supply and demand may be performed on the amount of demanded, and the supply bid for the remaining amount of power supplied may be kept valid. Alternatively, if the amount of power demand is greater than the amount of supply, partial matching of supply and demand may be performed on the amount of power supplied, and the demand bid for the remaining amount of demand may be kept valid. On the other hand, this embodiment 1 may also be applied to cases where the time slots for power supply bids and demand bids are different. For example, if the time width of the time slot for supplying power is wider than the time width of the time slot on the demand side, partial matching of supply and demand may be performed on the time width of the time slot on the demand side, and the remaining supply bid for the time width of the time slot on the supply side may be kept valid. Furthermore, if the time width of the time slot on the demand side of electricity is wider than the time width of the time slot on the supply side, partial supply-demand matching may be performed on the time width of the supply-side time slot, and demand bidding may be effectively continued for the remaining time width of the remaining time slot on the demand side. [Examples]

[0100] Figure 12 is a block diagram of the system according to this embodiment 2. Components with the same reference numerals as those in embodiment 1 are common to embodiment 1, so a detailed explanation is omitted. The difference in the system configuration of this embodiment 2 from embodiment 1 is that one or more replenishment charge / discharge systems 70 are provided. The replenishment charge / discharge system 70 comprises a replenishment charge / discharge device 82, such as a battery, which is connected to the power network 120 and performs charging and discharging of power, and a replenishment charge / discharge control computer 81, which is a computer that is communicatively connected to the power supply and demand management device 50 via the communication network 110. The replenishment charge / discharge control computer 81 communicates with the replenishment charge / discharge device 82 via the communication network 110 and controls the replenishment charge / discharge device 82. Within the power network 120, the replenishment charge / discharge system 70 supplies power when there is a power shortage and consumes power (charges) when there is a power surplus. In other words, the replenishment charge / discharge system 70 can act as both a power demand side and a power supply side. The supplemental charging and discharging system 70 is pre-charged with renewable and non-renewable energy to supplement the power supply. Furthermore, the supplemental charging and discharging system 70 reserves available charging space to charge any surplus power.

[0101] The hardware configuration of the power supply and demand management device 50 in Example 2 is the same as in Example 1. However, in Example 2, in addition to processes 1 to 4 described above, processes 5 and 6 are also executed.

[0102] (5) Process 5 The issuing unit 73, as a result of matching by the matching unit 72, if the charging / discharging system 40 receives renewable energy power as the power demand side and a shortage of renewable energy power occurs on the power supply side, and the second charging / discharging system (supplementary charging / discharging system 70) that supplies the shortage of renewable energy power supplies renewable energy power originating from the same or similar power source as the renewable energy power, will indicate the power source type 510, which is the type of renewable energy power, on the certificate (time-segmented power certificate 500).

[0103] (6) Process 6 When the demand side of electricity experiences a shortage in the demand for renewable energy electricity, and there is a third charging and discharging system (supplementary charging and discharging system 70) that receives renewable energy electricity in excess of that demand, the issuing unit 73 issues certificates (time-segmented power certificates 500) according to the amount of renewable energy electricity consumed by the demand side and the amount of renewable energy electricity received by the third charging and discharging system (supplementary charging and discharging system 70) at the time of receiving the electricity.

[0104] The following section provides a detailed explanation of the specific implementation processes for steps 5 and 6. Figure 13 shows an example of a power supply and demand sequence diagram with power supply compensation in Example 2. Figure 13A shows an example of a sequence diagram for power supply and demand quantity measurement with power supply compensation. Figure 13B shows an example of a sequence diagram for power supply and demand settlement with power supply compensation. In Figures 13A and 13B, the supplemental supply of renewable energy power is provided from the supplemental charging and discharging system 70, but a renewable power supply system 10 for supplemental purposes may also be provided.

[0105] The example in Figure 13 illustrates a case where, for example, a contract for the purchase and sale of renewable energy electricity, where power source type 510 is solar energy (PV), is concluded, and a malfunction occurs in the renewable energy supply system 10, resulting in insufficient supply of the contracted solar energy-derived renewable energy electricity. In this case, the supplementary charging and discharging system 70 compensates for the insufficient power supply. In this case, the power used to compensate for the shortage must be of the same power type, which in the above example is solar energy-derived renewable energy electricity.

[0106] Figure 13A shows the power supply and demand measurement sequence when the supply of renewable energy power from the renewable power supply system 10 is insufficient, assuming that the power supply and demand contract shown in Figure 9A has been concluded. When the power supply and demand contract time (step S620) for which the contract was concluded in Figure 9A arrives, the renewable power supply system 10 supplies renewable energy power, the charge / discharge system 40 charges the supplied power, and the supplemental charge / discharge system 70 supplies the power network 120 with the power that is insufficient (insufficient due to a partial failure of the renewable power supply system 10, etc.) (step S1210).

[0107] The renewable power supply system 10 measures the amount of electricity supplied (step S1211). The renewable power supply system 10 also notifies the power supply management device 50 of the measured power supply data 410 (Figure 6A) (step S1212). In the power supply and demand management device 50, the storage unit 74 stores the received power supply amount data 410 (Figure 8), and requests the distributed ledger system 60 to store a backup of the received power supply amount data 410 (step S1213).

[0108] The distributed ledger system 60 performs backup storage of the received power supply data 410 (step S1214). The supplemental charging / discharging system 70 measures the amount of electricity supplied (step S1215). The supplemental charging / discharging system 70 also notifies the power supply management device 50 of the power supply amount data 410 related to the measured amount of electricity, and the main certification ID 503 (Figure 7A) of the time-segmented power certificate 500 it holds (step S1216). This time-segmented power certificate 500 has its power source type 510 matched with the renewable energy power supplied by the insufficient renewable power supply system 10 (if it is derived from solar power, the power source type 510 is also solar power). In other words, if the supply side is insufficient, for example, renewable energy power derived from solar power, the supplemental charging / discharging system 70 notifies the main certification ID 503 of the time-segmented power certificate 500 which also has solar power (PV) indicated as the power source type 510 (step S1216).

[0109] The storage unit 74 stores the received power supply data 410 (Figure 8) and requests the distributed ledger system 60 to store a backup of the received power supply data 410 (step S1217). The distributed ledger system 60 performs backup storage of the received power supply data 410 (step S1218). The charging and discharging system 40 measures the amount of electricity that has been charged (step S1219). The charging and discharging system 40 also notifies the power supply and demand management device 50 of the power demand data 460 related to the amount of renewable energy electricity that was measured (step S1220).

[0110] The storage unit 74 stores the received power demand data 460 (Figure 8) and requests the distributed ledger system 60 to back up the power demand data 460 (step S1221). The distributed ledger system 60 stores the received power demand data 460 in backup (step S1222).

[0111] In Figure 13B, the evaluation unit 76 confirms the consistency between the amount of renewable energy electricity supplied from the renewable energy supply system 10 and the amount of electricity supplied as supplement from the supplemental charge / discharge system 70, and the amount of renewable energy electricity charged by the charge / discharge system 40, for the established electricity supply and demand contract (step S1223). Furthermore, the power supplemented by the supplemental charge / discharge system 70 based on the established electricity supply and demand contract is confirmed by the time-segmented power certificate 500 indicated by the received certification ID 503 to be of the same power source type 510 as the renewable energy electricity that is insufficient on the demand side (if renewable energy electricity derived from solar power generation is insufficient on the supply side, the power supplemented by the supplemental charge / discharge system 70 must also be derived from solar power generation). In addition, if the evaluation unit 76 confirms that there are no problems with the consistency of supply and demand for renewable energy electricity, the power supply and demand management device 50 notifies the renewable energy supply system 10 of the settlement decision (step S1224). Specifically, it notifies the power supply and demand management device 50 of the decision to pay the price (unit price × supply amount) for the amount of renewable energy electricity supplied. The power supply and demand management device 50 also notifies the supplementary charging and discharging system 70 of the settlement decision (step S1225). Specifically, it notifies the power supply and demand management device 50 of the decision to pay the price for the supplemented renewable energy electricity. Furthermore, the power supply and demand management device 50 notifies the charging and discharging system 40 of the settlement decision (step S1226). Specifically, it notifies the charging and discharging system 40 of the payment request for the price (unit price × supply amount) for the amount of renewable energy electricity charged.

[0112] The power supply and demand management device 50 performs payment settlement to the renewable power supply system 10 according to the determined settlement amount (step S1227). The storage unit 74 also stores the payment settlement data (deposit and withdrawal data 157) to the renewable power supply system 10 (Figure 8) and requests the distributed ledger system 60 to store a backup of the payment settlement data (deposit and withdrawal data 157) (step S1228). The distributed ledger system 60 stores a backup of the payment settlement data (deposit and withdrawal data 157) received for the renewable power supply system 10 (step S1229).

[0113] The power supply and demand management device 50 makes a payment settlement to the replenishment charging and discharging system 70 according to the determined settlement amount (step S1230). The storage unit 74 also stores the payment settlement data (deposit and withdrawal data 157) to the replenishment charging and discharging system 70 and requests the distributed ledger system 60 to store a backup of the same payment settlement data (deposit and withdrawal data 157) (step S1231). The distributed ledger system 60 stores a backup of the payment settlement data (deposit and withdrawal data 157) received for the replenishment charging and discharging system 70 (step S1232).

[0114] The charging and discharging system 40 makes a payment to the power supply and demand management device 50 according to the determined settlement amount (step S1233). The memory unit 74 stores the deposit settlement data (deposit and withdrawal data 157) from the charge / discharge system 40 and requests the distributed ledger system 60 to back up the deposit settlement data (deposit and withdrawal data 157) (step S1234). The distributed ledger system 60 backs up and stores the deposit settlement data (deposit and withdrawal data 157) received from the charge / discharge system 40 (step S1235).

[0115] Once the settlement of payments from the charging / discharging system 40 is complete, the update unit 75 updates the time-segmented power certificate 500 presented by the supplementary charging / discharging system 70 for the amount of renewable energy power consumed and discharged, and issues the updated new time-segmented power certificate 550 to the charging / discharging system 40 and the supplementary charging / discharging system 70 respectively. The storage unit 74 stores this (time-segmented power certificate data 156 in Figure 8) and requests the distributed ledger system 60 to back it up (step S1236).

[0116] The distributed ledger system 60 performs backup storage of the received time-segmented power certificates 550 (step S1237). The power supply and demand management device 50 notifies the charging and discharging system 40 of the main certification ID 503 of the data of the issued time-segment power certificate 550 (step S1238). The charging / discharging system 40 holds the original certification ID 503 of the received time-segmented power certificate 550 data (step S1239).

[0117] The power supply and demand management device 50 notifies the replenishment charging and discharging system 70 that the time-segment power certificate 500 that it had been assigned has been updated, and provides the main certification ID 503 of the updated time-segment power certificate 550 (step S1240). The replenishment charge / discharge system 70 holds the original certification ID 503 of the received time-segment power certificate 550 (step S1241).

[0118] Figure 14 shows an example of a power supply and demand sequence diagram with power demand compensation in Example 2. Figure 14A shows an example of a sequence diagram for power supply and demand measurement with power demand compensation. Figure 14B shows an example of a sequence diagram for power supply and demand settlement with power demand compensation. In Figures 14A and 14B, renewable energy power is supplied from the charging and discharging system 40, but renewable energy power may be supplied from the renewable energy power supply system 10.

[0119] In the example shown in Figure 14, a portion of the demand for renewable energy electricity is insufficient due to a malfunction in some of the equipment on the demand side of the power supply, i.e., the power demand system 30. Within the power network 120, the amount of power supplied and the amount of power demand must match. In particular, when supplying AC power, if the amount of power supplied and the amount of power demand do not match, a frequency shift or voltage shift will occur. Therefore, the manager of the power network 120 monitors whether or not such a frequency shift or voltage shift is occurring, and the power network 120 controls the power supply by stimulating demand when the power supply is high and compensating for the power supply when the power supply is low. The power supply and demand management device 50 can also detect when a portion of the demand for renewable energy electricity is insufficient within the power network 120, and the power supply and demand management device 50 takes countermeasures using the compensatory charging and discharging system 70.

[0120] Figure 14A shows the power supply and demand measurement sequence when the amount of renewable energy electricity demanded by the power demand system 30 is insufficient due to a partial failure of the power demand system 30, in the case where the power supply and demand contract shown in Figure 10A has been concluded. When the power supply and demand time (step S720) for which the contract was concluded in Figure 10A arrives, the charge / discharge system 40 supplies renewable energy electricity, the power demand system 30 consumes renewable energy electricity, and the supplemental charge / discharge system 70 consumes (charges) the surplus electricity in the power network 120 (step S1310).

[0121] The charging and discharging system 40 measures the amount of electricity supplied (step S1311). The charging and discharging system 40 also notifies the power supply data 410 related to the measured amount of renewable energy electricity to the power supply and demand management device 50 (step S1312). The storage unit 74 stores the received power supply data 410 (Figure 8) and requests the distributed ledger system 60 to store a backup of the power supply data 410 (step S1313).

[0122] The distributed ledger system 60 performs backup storage of the received power supply data 410 (step S1314). The replenishment charge / discharge system 70 measures the amount of electricity that has been charged (step S1315). The replenishment charge / discharge system 70 also notifies the power supply and demand management device 50 of the power demand data 460 related to the measured amount of electricity (step S1316). The storage unit 74 stores the received power demand data 460 (Figure 8) and requests the distributed ledger system 60 to back it up (step S1317).

[0123] The distributed ledger system 60 performs backup storage of the received power demand data 460 (step S1318). The charging and discharging system 40 measures the amount of electricity that has been charged (step S1319). The charging and discharging system 40 also notifies the power supply and demand management device 50 of the power demand data 460 related to the measured amount of renewable energy electricity (step S1320). The storage unit 74 stores the received power demand data 460 (Figure 8) and requests the distributed ledger system 60 to back it up (step S1321).

[0124] The distributed ledger system 60 backs up and stores the received power demand data 460 (step S1322). In Figure 14B, the evaluation unit 76 verifies the consistency between the amount of renewable energy electricity supplied and the sum of the amount of electricity charged as compensation and the amount of electricity consumed, for the established electricity supply and demand contract (step S1323). The electricity supply and demand management device 50 also notifies the charge / discharge system 40 of the settlement decision if there are no problems with the consistency of supply and demand for renewable energy electricity (step S1324). Specifically, it notifies the payment decision for the consideration (unit price × supply amount) for the amount of renewable energy electricity supplied. The electricity supply and demand management device 50 also notifies the compensation charge / discharge system 70 of the settlement decision (step S1325). Specifically, it notifies the system 70 of the payment request for the renewable energy electricity charged as compensation using the power source type 510 specified in the established electricity supply and demand contract. Furthermore, the electricity supply and demand management device 50 notifies the electricity demand system 30 of the settlement decision (step S1326). Specifically, it involves notifying the customer of a request for payment (unit price × supply amount) for the amount of renewable energy electricity consumed.

[0125] The power supply and demand management device 50 makes a payment settlement to the charging and discharging system 40 according to the determined settlement amount (step S1327). The storage unit 74 also stores the payment settlement data (income and expenditure data 157) to the renewable power supply system 10 (Figure 8) and requests the distributed ledger system 60 to back up this data (step S1328). The distributed ledger system 60 stores a backup of the payment settlement data (income and expenditure data 157) received for the renewable power supply system 10 (step S1329).

[0126] The replenishment charging / discharging system 70 makes a payment to the power supply and demand management device 50 according to the determined settlement amount (step S1330). The memory unit 74 stores the deposit settlement data (deposit and withdrawal data 157) from the replenishment charging and discharging system 70 (Figure 8) and requests the distributed ledger system 60 to back up this data (step S1331). The distributed ledger system 60 backs up and stores the deposit settlement data (deposit and withdrawal data 157) received from the replenishment charging and discharging system 70 (step S1332).

[0127] The power demand system 30 makes a payment settlement to the power supply and demand management device 50 according to the determined settlement amount (step S1333). The memory unit 74 stores the deposit settlement data (deposit and withdrawal data 157) from the power demand system 30 (Figure 8) and requests the distributed ledger system 60 to back up this data (step S1334). The distributed ledger system 60 records the receipt settlement data (deposit and withdrawal data 157) received from the power demand system 30 (step S1335).

[0128] Once the settlement of payments from the supplemental charge / discharge system 70 and the power demand system 30 is complete, the power supply and demand management device 50 updates the time-segmented power certificate 500 presented by the charge / discharge system 40 for the amount of renewable energy electricity charged and consumed in the power source type 510 specified in the contract, and issues a new time-segmented power certificate 550 to the power demand system 30. Meanwhile, the issuing unit 73 issues a new time-segmented power certificate 500 to the supplemental charge / discharge system 70. The storage unit 74 then stores this (time-segmented power certificate data 156 in Figure 8) and requests the distributed ledger system 60 to also store it as a backup (step S1336).

[0129] The distributed ledger system 60 backs up and stores the received time-segmented power certificates 550 (step S1337). The power supply and demand management device 50 notifies the charging and discharging system 40 that the time-segmented power certificate 500 it had been assigned has been updated (step S1338). The power supply and demand management device 50 notifies the power demand system 30 of the main certification ID 503 of the issued time-segment power certificate 550 (step S1339).

[0130] The power demand system 30 holds the original certification ID 503 of the received time-segment power certificate 550 (step S1340). The power supply and demand management device 50 notifies the replenishment charging and discharging system 70 of the main certification ID 503 of the issued time-segmented power certificate 550 and time-segmented power certificate 500 (step S1341). The replenishment charge / discharge system 70 holds the original certification ID 503 of the received time-segment power certificate 550 and time-segment power certificate 500 (step S1342).

[0131] According to the power supply and demand management system 1 described above, the aforementioned process 5 is executed. Therefore, when there is a power shortage, it is guaranteed that the supplementary charging and discharging system 70 will supply renewable energy power of the same power source type 510 as the shortage. Thus, the use of renewable energy power can be promoted.

[0132] Furthermore, the power supply and demand management system 1 executes the process 6 described above. As a result, the update unit 75 updates the time-segmented power certificate 500 presented by the charge / discharge system 40 and issues a new time-segmented power certificate 550 to the power demand system 30. Meanwhile, the issuing unit 73 issues a new time-segmented power certificate 500 to the supplemental charge / discharge system 70. Therefore, when the power demand is insufficient and the supplemental charge / discharge system 70 charges to supplement the shortfall, it is possible to reliably guarantee that the power being charged is renewable energy power. Thus, the use of renewable energy power can be promoted. [Examples]

[0133] In this embodiment 3, the supply and demand operation of discharge power performed between different charge and discharge systems 40 will be explained using Figure 15. Figure 15A is an example of a supply and demand contract sequence diagram for discharge power between different charge and discharge systems. Figure 15B is an example of a supply and demand sequence diagram for discharge power between different charge and discharge systems. That is, a charge and discharge system 40 that can charge and discharge power can be both the demand side and the supply side of power. In this embodiment 3, the charge and discharge system 40 on the demand side of power is referred to as charge and discharge system 40-2, and the charge and discharge system 40 on the supply side is referred to as charge and discharge system 40-1.

[0134] In Figure 15A, the charging and discharging system 40-1 submits a supply bid to the power supply and demand management device 50 for renewable energy electricity (100% renewable energy) that it wishes to sell (step S1402). In this supply bid, since the supply bid comes from the charging and discharging system 40-1, which does not generate renewable energy electricity, it is necessary to demonstrate that it is able to supply renewable energy electricity. Specifically, the charging and discharging system 40-1 must demonstrate that it has charged renewable energy electricity prior to this supply bid and is holding renewable energy electricity. Therefore, the charging and discharging system 40-1 submits a power supply bid including the main certification ID 503 of the time-segmented power certificate 500, which demonstrates that it is holding renewable energy electricity.

[0135] In the power supply and demand management device 50, the evaluation unit 76 determines whether renewable energy power can be supplied based on the contents of the received power supply bid data 210. If there are no problems, the reception unit 71 accepts the power supply bid data 210, and the storage unit 74 stores the power supply bid data 210 (step S1403). In this power supply bid, the power supply bid is made including the main certification ID 503 of the time-segmented power certificate 500, which indicates that the charge / discharge system 40-1 holds renewable energy power, and the evaluation unit 76 determines that renewable energy power can be supplied.

[0136] Furthermore, the storage unit 74 requests the distributed ledger system 60 to store a backup of the power supply bidding data 210 (step S1404). The distributed ledger system 60 performs backup storage of the received power supply bid data 210 (step S1405). The charging and discharging system 40-2 submits a demand bid for the required renewable energy electricity (100% renewable energy) to the power supply and demand management device 50 (step S1406).

[0137] The evaluation unit 76 confirms that the received power demand bid data 260 is power charging from the charge / discharge system 40-2. If there are no problems, the reception unit 71 accepts the demand bid, and the storage unit 74 stores the power demand bid data 260 (step S1407). The storage unit 74 also requests the distributed ledger system 60 to store a backup of the power demand bid data 260 (step S1408). The distributed ledger system 60 performs backup storage of the received power demand bidding data 260 (step S1409).

[0138] The matching unit 72 determines whether the conditions match between the power supply bid and the demand bid (matching), and if there are supply bids and demand bids that match, it concludes a power supply contract (step S1410). The storage unit 74 also stores the concluded power supply contract data 310 if a power supply contract has been concluded (Figure 8), and requests the distributed ledger system 60 to store a backup of the concluded power supply contract data 310 (step S1411).

[0139] The distributed ledger system 60 performs backup storage of the received power supply contract data 310 (step S1412). The power supply and demand management device 50 notifies the charging and discharging system 40-1 that a contract for power supply bidding has been concluded (step S1413). The power supply and demand management device 50 also notifies the charging and discharging system 40-2 that a contract for power demand bidding has been concluded (step S1414).

[0140] In Figure 15B, when the time for the power supply contract that has been concluded (step S1420) arrives, the charge / discharge system 40-1 supplies renewable energy power, and the charge / discharge system 40-2 charges the supplied power (step S1421). The charging / discharging system 40-1 measures the amount of electricity supplied (step S1422). The charging / discharging system 40-1 also notifies the power supply data 410 related to the measured amount of electricity to the power supply management device 50 (step S1423).

[0141] The storage unit 74 stores the received power supply data 410 and requests the distributed ledger system 60 to store a backup of the power supply data 410 (step S1424). The distributed ledger system 60 performs backup storage of the received power supply data 410 (step S1425). The charging and discharging system 40-2 measures the amount of electricity that has been charged (step S1426). The charging and discharging system 40-2 also notifies the power supply and demand management device 50 of the power demand data 460 related to the measured amount of electricity (step S1427).

[0142] The storage unit 74 stores the received power demand data 460 (Figure 8) and requests the distributed ledger system 60 to back up the power demand data 460 (step S1428). The distributed ledger system 60 backs up and stores the received power demand data 460 (step S1429). The evaluation unit 76 confirms the consistency between the amount of renewable energy electricity supplied and the amount of renewable energy electricity charged for the established electricity supply and demand contract (step S1430). If there are no problems with the consistency of supply and demand for renewable energy electricity, the power supply and demand management device 50 notifies the charge / discharge system 40-1 of the settlement decision (step S1431). Specifically, it notifies the payment decision for the amount of renewable energy electricity supplied (unit price × supply amount). The power supply and demand management device 50 also notifies the charge / discharge system 40-2 of the settlement decision (step S1432). Specifically, it notifies the payment request for the amount of renewable energy electricity charged (unit price × charge amount).

[0143] The power supply and demand management device 50 performs payment settlement to the charge / discharge system 40-1 according to the determined settlement amount (step S1433). The storage unit 74 also stores the payment settlement data (deposit / withdrawal data 157) for the charge / discharge system 40-1 (Figure 8) and requests the distributed ledger system 60 to store a backup of the payment settlement data (deposit / withdrawal data 157) for the charge / discharge system 40-1 (step S1434). The distributed ledger system 60 backs up and stores the payment settlement data (deposit and withdrawal data 157) received for the charge / discharge system 40-1 (step S1435).

[0144] The charging and discharging system 40-2 makes a payment to the power supply and demand management device 50 according to the determined settlement amount (step S1436). The memory unit 74 stores the deposit settlement data (deposit and withdrawal data 157) from the charge / discharge system 40-2 (Figure 8), and requests the distributed ledger system 60 to store a backup of the deposit settlement data (deposit and withdrawal data 157) from the charge / discharge system 40-2 (step S1437).

[0145] The distributed ledger system 60 backs up and stores the deposit settlement data (deposit and withdrawal data 157) received from the charge / discharge system 40-2 (step S1438). When the payment settlement from the charge / discharge system 40-2 is completed, the issuing unit 73 issues a time-segmented power certificate 500 for the amount of renewable energy power that has been charged, and the storage unit 74 stores this and requests the distributed ledger system 60 to store a backup of it (step S1439). Specifically, a time-segmented power certificate 500 to be provided to the charge / discharge system 40-2 is created in the form of an update to the time-segmented power certificate 500 presented by the charge / discharge system 40-1. Therefore, the storage unit 74 stores that the time-segmented power certificate 500 that was attached to the charge / discharge system 40-1 has been updated and requests the distributed ledger system 60 to store a backup of it. The time-segmented power certificate 500 attached to the charge / discharge system 40-2 was issued for the charging of renewable energy power by the charge / discharge system 40-2, and "OK" is specified as the update feasibility 513 to indicate that the supply of renewable energy power based on the time-segmented power certificate 500 is possible.

[0146] The distributed ledger system 60 backs up and stores the received time-segmented power certificates 500 (step S1440). The power supply and demand management device 50 notifies the charge / discharge system 40-1 that the time-segmented power certificate 500 it had been assigned has been updated (step S1441). The power supply and demand management device 50 also notifies the charge / discharge system 40-2 of the main certification ID 503 of the newly issued time-segmented power certificate 500 (step S1442). The charging / discharging system 40-2 holds the main certification ID 503 of the received time-segment power certification 500 (step S1443).

[0147] In this embodiment 3, the same effects and advantages as in embodiment 1 can be achieved, except that the power demand side is changed from the renewable power supply system 10 to the charge / discharge system 40-1.

[0148] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are described in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to replace parts of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add configurations from other embodiments to the configuration of one embodiment. In addition, it is possible to add, delete, or replace parts of the configuration of each embodiment with other configurations.

[0149] Furthermore, each of the above configurations, functions, processing units, and processing means may be implemented in hardware, either partially or entirely, by designing them as integrated circuits, for example. Alternatively, each of the above configurations and functions may be implemented in software by having the processor interpret and execute programs that implement each function. Information such as programs, tables, and files that implement each function can be stored in memory, a recording device such as a hard disk or SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

[0150] Furthermore, the control lines and information lines shown are those deemed necessary for explanatory purposes, and not all control lines and information lines are necessarily shown in the actual product. In reality, it can be assumed that almost all components are interconnected. [Explanation of symbols]

[0151] 1. Power supply and demand management system 10. Renewable power supply system (supply side) 30. Power Demand System (Demand Side) 40. Charging and discharging systems (supply side, demand side) 50 Power supply and demand management device 60. Distributed ledger system (backup device) 70. Replenishment charge / discharge system (supply side, demand side, second charge / discharge system, third charge / discharge system) 71 Reception Department 72 Matching Section 73 Publishing Department 74 Memory section 75 Update section 76 Evaluation Department 500 Time-segmented power certificate (certificate) 503 This Certificate ID (Identification Mark) 507 Electricity usage time classification 510 Power Type 511 Power consumption 512 Amount of power that can be supplied 550 Time-segmented power certificate (certificate)

Claims

1. A receiving unit that receives supply bids for renewable energy electricity from the supply side and demand bids for renewable energy electricity from the demand side via communication, A matching unit that matches the received supply bids with the demand bids, As a result of the matching, when a charge / discharge system capable of charging and discharging electricity receives renewable energy electricity as the demand side, the system includes an issuing unit that issues a modifiable certificate indicating that the received renewable energy electricity is of renewable energy origin, The system comprises a storage unit for storing the certificate issued by the issuing unit, The power supply and demand management system is characterized in that the issuing unit records a power usage time classification indicating the date and time and time period during which the renewable energy power was received on the certificate.

2. The power supply and demand management system according to claim 1, further comprising an update unit that updates and makes irreparable the certificate corresponding to the renewable energy power being supplied when the charging and discharging system supplies the renewable energy power being charged to the charging and discharging system to the demand side as a result of the matching.

3. When the receiving unit receives the supply bid from the charging / discharging system, it receives the certificate or identification mark of the certificate from the charging / discharging system. The system further comprises an evaluation unit that evaluates whether the charging and discharging system is capable of supplying the renewable energy power based on the certificate or identification mark received at the reception unit, The power supply and demand management system according to claim 1, characterized in that the receiving unit accepts the supply bid from the charging and discharging system when the evaluation unit determines that the charging and discharging system is capable of supplying the renewable energy power.

4. The power supply and demand management system according to claim 1, characterized in that, as a result of the matching, when the charging and discharging system receives the renewable energy power as the demand side, the issuing unit includes in the certificate the amount of renewable energy power that can be supplied from the charging and discharging system.

5. The power supply and demand management system according to claim 4, characterized in that the amount of power that can be supplied is less than the amount of power received from renewable energy.

6. The power supply and demand management system according to claim 3, characterized in that the evaluation unit performs the evaluation based on the amount of power that is naturally discharged according to the time difference from the time the charging and discharging system receives the renewable energy power to the time the renewable energy power is supplied, subtracted from the amount of available power that indicates the amount of renewable energy power that can be supplied from the charging and discharging system.

7. The power supply and demand management system according to claim 1, further comprising a backup device for storing the aforementioned certificate as a backup.

8. The power supply and demand management system according to claim 1, characterized in that, as a result of the matching, when the charging and discharging system receives renewable energy power as the demand side and a shortage of renewable energy power occurs on the supply side, the issuing unit indicates in the certificate the type of power source which is the type of renewable energy power when a second charging and discharging system that supplies the shortage of renewable energy power supplies renewable energy power originating from the same or similar power source as the renewable energy power.

9. The power supply and demand management system according to claim 1, characterized in that, when the issuing unit experiences a shortage in the demand for renewable energy electricity on the demand side and there is a third charging and discharging system that receives renewable energy electricity in excess of the demand, it issues certificates according to the amount of renewable energy electricity consumed by the demand side and the amount of renewable energy electricity received by the third charging and discharging system at the time of receiving the electricity.

10. A power supply and demand management method performed by a power supply and demand management device which is an information processing device comprising a reception unit, a matching unit, an issuing unit, and a storage unit, The receiving unit performs a receiving process that receives, via communication, supply bids for renewable energy electricity from the supply side and demand bids for renewable energy electricity from the demand side. A matching process by the matching unit that performs the process of matching the received supply bids with the demand bids, As a result of the matching, when a charge / discharge system capable of charging and discharging electricity receives renewable energy electricity as the demand side, the issuing unit performs an issuance process to issue a modifiable certificate indicating that the received renewable energy electricity is of renewable energy origin. The system comprises a storage step in which the storage unit stores the certificate issued in the issuance step, The issuance process is characterized by including a power usage time classification on the certificate, which indicates the date and time and time period during which the renewable energy power was received.

11. The power supply and demand management device further comprises an update unit, The power supply and demand management method according to claim 10, further comprising an update step by the update unit to update and make irreparable the certificate corresponding to the renewable energy power received that is charged in the charge / discharge system and supplied to the demand side as a result of the matching, when the charge / discharge system supplies the renewable energy power received that is charged in the charge / discharge system as the supply side.

12. The power supply and demand management device further comprises an evaluation unit, The aforementioned acceptance process, when accepting the supply bid from the charging / discharging system, receives the certificate or identification mark of the certificate from the charging / discharging system, Based on the certificate or identification mark received in the reception process, the charging and discharging system is evaluated to determine whether it can supply the renewable energy power. The evaluation step is further performed by the evaluation unit that performs the processing, The power supply and demand management method according to claim 10, characterized in that the reception step accepts the supply bid from the charge / discharge system when the evaluation step determines that the charge / discharge system is capable of supplying the renewable energy power.

13. The power supply and demand management method according to claim 10, characterized in that, as a result of the matching, when the charging and discharging system receives the renewable energy power as the demand side, the amount of power that can be supplied from the charging and discharging system is recorded in the certificate.

14. The power supply and demand management method according to claim 12, characterized in that the evaluation step is performed based on an amount of power obtained by subtracting the amount of power that is naturally discharged according to the time difference from the time when the charging and discharging system receives the renewable energy power to the time when the renewable energy power is supplied, from the amount of power that can be supplied from the charging and discharging system.

15. The power supply and demand management method according to claim 10, further comprising a backup step in which the storage unit stores the aforementioned certificate as a backup.

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