Power management device and power management method

Abstract

To provide a power management device and a power management method that can prove derivation of a power source using renewable energy and can distribute renewable energy in accordance with a target renewable energy rate.SOLUTION: Provided is a power management device including: a plurality of supplier facilities; a block chain platform having a plurality of nodes; and a plurality of consumer facilities, in which a power management device 331 of a consumer facility includes a distribution coefficient calculation unit 3331 that, based on a difference between a target renewable energy rate of each of the consumer facilities and a cumulative renewable energy rate, obtains a distribution coefficient of each of the consumer facilities that receive supply of power, a distribution unit 3332 that, in accordance with the distribution coefficient of each of the consumer facilities, distributes power from renewable energy to consumer facilities which are distribution targets, and a registration unit 3333 that requests registration of power transaction data concerning distributed power in a distributed ledger.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a power management device and a power management method.

Background Art

[0002] Amidst the demand for a significant reduction in greenhouse gas emissions that cause climate change, major companies have been actively strengthening their environmental management initiatives for the sustainable development of society and their own companies. For example, the number of companies participating in the international corporate alliance "RE100," which aims to convert all electricity used in business activities to renewable energy, has been increasing annually. As of February 2021, 288 companies worldwide and 50 companies in Japan are participating. Since participating companies are required to declare plans and goals to power their business operations entirely with renewable energy, there are signs of a sharp increase in the need to improve the renewable energy rate. To improve the renewable energy rate, companies need to procure electricity whose environmental value as being derived from renewable energy has been proven.

[0003] As methods for procuring renewable energy power, (a) installing a renewable energy power generation plant within the company's premises for consumption, (b) installing a renewable energy power generation plant off-site by the company itself for self-delivery, and (c) procurement from a retail electricity provider are assumed. Also, as a method for proving the environmental value of renewable energy power, for example, power source tracking using blockchain can be considered. Patent Document 1 describes a method for supporting power procurement considering multiple procurement sources.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By recording the transaction history on the blockchain, it is possible to track the electricity generated from renewable energy. As a result, for example, when an electricity retailer supplies electricity from a large-scale solar power plant in the suburbs to customers, the origin of the power source such as renewable energy can be proven, and electricity with high added value can be sold.

[0006] In addition, RE100 has set a target of 100% renewable energy rate by 2050. To achieve this, values such as the target renewable energy rate for each year are set at intermediate stages. By recording the transaction history on the blockchain, it is possible to confirm the achievement status of the renewable energy rate. However, in order to correspond to the target renewable energy rate that changes annually, it is necessary to adjust the transaction volume from the energy site that provides renewable energy to the consumers. The technology described in Patent Document 1 distributes renewable energy to consumers considering multiple procurement sources, but does not consider power distribution according to the target renewable energy rate that changes annually.

[0007] In view of the above problems, an object of the present invention is to provide a power management device and a power management method that can prove the origin of the power source using renewable energy and can distribute renewable energy according to the target renewable energy rate.

Means for Solving the Problems

[0008] A power management system according to an aspect of the present invention includes a distribution coefficient calculation unit that obtains a distribution coefficient for each consumer facility that receives power supply based on the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility, a distribution unit that distributes power generated by renewable energy to the consumer facilities to be distributed according to the distribution coefficient of each consumer facility, and a registration unit that requests registration of power transaction data related to the distributed power in a distributed ledger.

[0009] A power management method according to an aspect of the present invention is a power management method executed by a computer. Based on the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility, a distribution coefficient of each consumer facility receiving power supply is obtained. According to the distribution coefficient of each consumer facility, power generated by renewable energy is distributed to the consumer facilities to be distributed, and a registration request for power transaction data related to the distributed power is made to a distributed ledger.

Advantages of the Invention

[0010] According to the present invention, by storing the power usage status in a blockchain, the origin of the power using renewable energy can be proven, and power distribution to consumers can be performed so that the renewable energy rate of each building approaches the target renewable energy rate.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7

Embodiment for Carrying Out the Invention

[0012] Hereinafter, the power management device 1 according to an embodiment of the present invention will be described with reference to the drawings.

[0013] <Overview of the Device> FIG. 1 is a schematic block diagram showing the configuration of a power management device 1 according to an embodiment of the present invention. As shown in FIG. 1, the power management device 1 according to an embodiment of the present invention includes a blockchain platform 10, a supplier facility 20, and a consumer facility 30.

[0014] The blockchain platform 10 has a plurality of nodes N1 to N6 communicably connected. The plurality of nodes N1 to N6 are each constituted by a computer. Each of the nodes N1 to N6 obtains the hash value of the data indicating the power usage status every time it receives the data at regular intervals and has a form of a distributed ledger shared with other nodes. The number of nodes N1 to N6 is arbitrary. By using such blockchain technology, each of the nodes N1 to N6 can save the power usage status in each consumer facility 30 without being tampered with by electronically storing it in the distributed ledger.

[0015] The supplier facility 20 is a facility of a retail electricity provider. Examples of the supplier facility 20 include the grid power provider S1, the biomass power generation provider S2, the megasolar power generation provider S3, etc. The biomass power generation provider S2 and the megasolar power generation provider S3 generate electricity using renewable energy. The grid power provider S1 generates part of its electricity using renewable energy. The supplier facility 20 is not limited to the above configuration, and the number of providers constituting the supplier facility 20 is arbitrary.

[0016] The consumer facility 30 is a facility that receives and consumes power supply. Examples of the consumer facility 30 include Building A1, Building A2, Building A3, and Building A4. Buildings A1 to A4 include various types of facilities such as office buildings, condominiums, factories, commercial facilities, and ordinary residences. The number of buildings constituting the consumer facility 30 is arbitrary. Each of the buildings A1 to A4 constituting the consumer facility 30 is equipped with a measuring device for measuring the power usage situation and a computer (for example, the power management device 331 described later) that sends the power usage situation to the blockchain platform 10. Also, in this embodiment, a target renewable energy rate is set for Buildings A1 to A4. The renewable energy rate is a value represented by ((renewable energy power / generated power) × 100), and from the perspective of reducing greenhouse gas emissions, it is desired to approach 100% for the renewable energy rate. The target renewable energy rate is set step by step to reach 100% for the renewable energy rate.

[0017] Among the buildings of the consumer facility 30, there may be cases where power generation facilities and energy storage facilities are provided. In this example, Building A1 is equipped with a solar power generation facility PV1 and a storage battery BAT1. Building A2 is equipped with a solar power generation facility PV2. The consumer facility 30 having the solar power generation facilities PV1 and PV2, such as Buildings A1 and A2, can transmit the surplus power to other consumer facilities.

[0018] FIG. 2 shows an example of the consumer facility 30 in the power management device 1 according to an embodiment of the present invention. This example is one with power generation facilities and energy storage facilities such as Building A1.

[0019] As shown in FIG. 2, the consumer facility 30 has a power meter 301, a load 302, measurement devices 303a to 303c, a PV (Photovoltaic) panel 311, a PCS (Power Conditioning Subsystem) 312, a storage battery 321, and a power management device 331 connected via a cable 341. The cable 341 may include a power line and a communication line.

[0020] The power meter 301 measures the power purchased from the external utility power source 40 by the consumer facility 30 or sold from the consumer facility 30 to the utility power source 40, and transmits the measurement result to the power management device 331 via the cable 341.

[0021] The load 302 consists of devices that consume power in the consumer facility 30, such as lighting fixtures and air conditioners.

[0022] The measurement device 303a measures the power supplied to the load 302 and outputs the measurement result to the power management device 331. The measurement device 303b measures the generated power of the PV panel 311 and outputs the measurement result to the power management device 331. The measurement device 303c measures the power charged and discharged in the storage battery 321 and outputs the measurement result to the power management device 331.

[0023] The PV panel 311 converts sunlight into electric power using solar cells. The generated power of the PV panel 311 can be consumed by the load 302 for self - use. Also, the generated power of the PV panel 311 can be used for charging the storage battery 321. Further, when there is an excess of generated power in the PV panel 311, the generated power can be distributed to other consumer facilities 30. The PV panel 311 corresponds to the solar power generation facility PV1 in FIG. 1.

[0024] The PCS 312 converts the DC power (renewable energy) supplied from the PV panel 311 into AC power and supplies it to the load 302 and the storage battery 321.

[0025] The storage battery 321 stores electric power supplied from at least one of the electric power generated by the PV panel 311 and the electric power supplied from the grid power supply. The storage battery 321 corresponds to the storage battery BAT1 in FIG. 1.

[0026] FIG. 3 is a schematic block diagram for explaining the functions of the power management device 331. FIG. 3 realizes the process when distributing the generated power of the PV panel 311 to other consumer facilities.

[0027] As shown in FIG. 3, the power management device 331 includes a distribution coefficient calculation unit 3331, a distribution unit 3332, and a registration unit 3333. The distribution coefficient calculation unit 3331 obtains the distribution coefficient of each consumer facility receiving power supply based on the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility.

[0028] The distribution unit 3332 distributes the power generated by renewable energy to a plurality of consumer facilities according to the distribution coefficient of each consumer facility.

[0029] The registration unit 3333 transmits information on power transactions (power transaction data) regarding the distributed power to the blockchain platform 10, so that it can be stored in a traceable manner by the blockchain. Thereby, it becomes possible to prove the environmental value of renewable energy by referring to the data stored in the blockchain platform 10.

[0030] These distribution coefficient calculation unit 3331, distribution unit 3332, and registration unit 3333 may be composed of a processing device such as a CPU (Central Processing Unit) or a dedicated electronic circuit.

[0031] <Regarding Power Distribution> Next, the power distribution in the first embodiment of the present invention will be described. In this embodiment, each identifier shall have the following meanings. Also, the photovoltaic power generation facility PV1 corresponds to the PV panel 311 in FIG. 2, the storage battery BAT1 corresponds to the storage battery 321, and the load L1 corresponds to the load 302. Hereinafter, the calculations related to power distribution are performed by the power management device 331. Also, the variables are described as follows.

[0032]

Number

[0033] Also, the function min() shall return the minimum value among a series of arguments. The function max() shall return the maximum value among a series of arguments. The function sum() shall return the sum of a series of arguments.

[0034] <When consuming the generated power by oneself> When there is a power generation facility or a power storage facility as the consumer facility 30, power can be supplied from these power generation facilities and power storage facilities to the building load, and the generated and stored power can be consumed by oneself. Building A1 in FIG. 1 is equipped with the photovoltaic power generation facility PV1 and the storage battery BAT1, and building A2 is equipped with the photovoltaic power generation facility PV2.

[0035] FIGS. 4A and 4B are explanatory diagrams of power distribution when consuming the generated power by oneself in the power management device 1 according to an embodiment of the present invention. As shown in FIG. 4A, if the generated power of the photovoltaic power generation facility PV1 is surplus with respect to the load power, the generated power of the photovoltaic power generation facility PV1 is sent to the load L1 of building A1, and the remainder is distributed to other buildings. Therefore, the distributed power from the photovoltaic power generation facility PV1 to the load L1 of building A1 (transaction_PV1_to_A1) is equal to the load power (load_power_A1) of the load L1 of building A1, and the remaining distributed power of the photovoltaic power generation facility PV1 is generated.

[0036] As shown in FIG. 4B, if the generated power of the solar power generation facility PV1 is smaller than the load power of the load L1, the generated power of the solar power generation facility PV1 is sent to the load L1 of the building A1, and the shortage is supplemented from the outside. Therefore, the distributed power (transaction_PV1_to_A1) from the solar power generation facility PV1 to the load L1 of the building A1 is equal to the generated power (production_power_PV1) of the solar power generation facility PV1, and the remaining distributed power to the load power of the building A1 is generated.

[0037] From the above, the distributed power (transaction_PV1_to_A1) from the solar power generation facility PV1 to the load L1 of the building A1 is the smaller power of the generated power (production_power_PV1) of the solar power generation facility PV1 and the load power (load_power_A1) of the load L1 of the building A1. This relationship can be expressed by the following relational expression (1).

[0038]

Equation

[0039] The remaining distributed power (remainder_PV1) of the solar power generation facility PV1 is obtained by subtracting the distributed power (transaction_PV1_to_A1) from the solar power generation facility PV1 to the load L1 of the building A1 from the generated power (production_power_PV1) of the solar power generation facility PV1. Also, the remaining distributed power (remainder_A1) of the load power of the building A1 is obtained by subtracting the distributed power (transaction_PV1_to_A1) from the solar power generation facility PV1 to the load L1 of the building A1 from the load power (load_power_A1) of the building A1. This relationship can be expressed by the following relational expression (2).

[0040]

Equation

[0041] Information on power transactions such as the distributed power from the solar power generation facility PV1 to the load L1 of building A1 (transaction_PV1_to_A1), the remaining distributed power of the solar power generation facility PV1 (remainder_PV1), and the remaining distributed power of the load power of building A1 (remainder_A1) is obtained as the hash value with the previous block, connected to form a blockchain, and shared in a distributed ledger, and is stored in the blockchain platform 10 in the blockchain.

[0042] <When consuming the stored power by oneself> FIGS. 5A and 5B are explanatory diagrams of power distribution when consuming the stored power by oneself in the power management device 1 according to an embodiment of the present invention. Here, the distribution of the battery BAT1 of building A1 will be described.

[0043] As shown in FIG. 5A, if the generated power of the battery BAT1 is surplus with respect to the load power, the battery BAT1 will be in a discharging state, and the battery output of the battery BAT1 will be sent to the load L1 of building A1. At this time, the distributed power from the battery BAT1 to the load L1 of building A1 (transaction_BAT1_to_A1) is equal to the remaining distributed power (remainder_A1) of the load L1 of building A1 so far, and the remaining distributed power of the battery output of the battery BAT1 occurs.

[0044] As shown in FIG. 5B, if the battery output of the battery BAT1 is smaller than the load power of the load L1, the battery output of the battery BAT1 will be sent to the load L1 of building A1, and the shortage will be replenished from the outside. At this time, the distributed power from the battery BAT1 to the load L1 of building A1 (transaction_BAT_to_A1) is equal to the battery output (strage_power_BAT1) of the battery BAT1, and the remaining distributed power to the load power of building A1 occurs.

[0045] From the above, the distributed power (transaction_BAT1_to_A1) from the storage battery BAT1 to the load L1 of the building A1 is the smaller of the storage battery output (strage_power_BAT1) of the storage battery BAT1 and the remaining distributable power (remainder_A1) of the load L1 of the building A1. This relationship can be expressed by the following relational expression (3).

[0046]

Number

[0047] Also, the remaining distributable power (remainder_BAT1) of the storage power output of the storage battery BAT1 and the remaining distributable power (remainder_A1) of the load power of the building A1 are as follows. This relationship can be expressed by the following relational expression (4).

[0048]

Number

[0049] Power transaction information such as the distributed power (transaction_PV1_to_A1) from the storage battery BAT1 to the load L1 of the building A1, the remaining distributable power (remainder_BAT1) of the storage battery BAT1, and the remaining distributable power (remainder_A1) of the load power of the building A1 is stored in the blockchain platform 10 in the blockchain, such that the hash value with the previous block is obtained, the blockchain is connected, and it is shared in the distributed ledger.

[0050] <When storing the generated power> Figures 6A and 6B are explanatory diagrams of power distribution when storing the power generated by the power management device 1 according to an embodiment of the present invention. As shown in Figure 6A, when the generated power of the solar power generation facility PV1 is surplus with respect to the battery output of the battery BAT1 (remainder_PV1 > 0 until then), and the battery BAT1 is being charged, the battery BAT1 is charged by the generated power of the solar power generation facility PV1. At this time, when the remaining power of the distribution of the generated power of the solar power generation facility PV1 is large with respect to the battery output of the battery BAT1, the power distributed from the solar power generation facility PV1 to the battery BAT1 (transaction_PV1_to_BAT1) is equal to the battery output (strage_power_BAT1) of the battery BAT1, and the remaining power of the distribution of the generated power occurs.

[0051] As shown in Figure 6B, when the generated power of the solar power generation facility PV1 is small with respect to the battery output of the battery BAT1, the power distributed from the solar power generation facility PV1 to the battery BAT1 (transaction_PV1_to_BAT) is equal to the remaining power of the distribution of the solar power generation facility PV1 (remainder_PV1) until then.

[0052] From the above, the power distributed from the solar power generation facility PV1 to the battery BAT1 (transaction_PV1_to_BAT1) is the smaller of the remaining power of the distribution of the solar power generation facility PV1 (remainder_PV1) and the battery output (strage_power_BAT1) of the battery BAT1. Note that the battery output (strage_power_BAT1) of the battery BAT1 is determined with discharge being positive and charge being negative. This relationship can be represented by the following relational expression (5).

[0053]

Equation

[0054] Also, the remaining power for power distribution of the solar power generation facility PV1 is obtained by subtracting the power distributed from the solar power generation facility PV1 to the battery BAT1 (transaction_PV1_to_BAT1) from the previous remaining power for power distribution of the solar power generation facility PV1 (remainder_PV1). Further, the remaining power for power distribution of the battery output of the battery BAT1 (remainder_BAT1) is obtained by adding the power distributed from the solar power generation facility PV1 to the battery BAT1 (transaction_PV1_to_BAT1) to the stored power of the battery BAT1 (strage_power_BAT1). This relationship can be represented by the following relational expression (6).

[0055] [Number]

[0056] Information on power transactions such as the power distributed from the solar power generation facility PV1 to the battery BAT1 (transaction_PV1_to_BAT1), the remaining power for distribution of the solar power generation facility PV1 (remainder_PV1), and the remaining power for distribution of the battery BAT1 (remainder_BAT1) is obtained by calculating the hash value with the previous block, connecting the blockchain, and sharing it in a distributed ledger. It is stored in the blockchain platform 10 in the blockchain.

[0057] [Case of consuming surplus renewable power in the neighborhood] When there is a surplus in the renewable power in the neighborhood, the surplus power can be transmitted to other buildings. For example, when there is a surplus in the solar power generation facility PV1 of building A1 in Fig. 1 (where the previous remainder_PV1 > 0), the power of the solar power generation facility PV1 can be transmitted to the neighboring buildings A2 - A4. Here, since the distribution to building A1 from the solar power generation facility PV1 has been consumed until now, it is set to "0".

[0058] FIG. 7 is an explanatory diagram of power distribution when consuming excess renewable power in the vicinity in the power management device 1 according to an embodiment of the present invention. As shown in FIG. 7, when there is an excess in the remaining power (remainder_PV1) of the power generated by the solar power generation facility PV1 of building A1, the remaining power (remainder_PV1) of the power generated by the solar power generation facility PV1 of building A1 is distributed to buildings A2 to A4 and transmitted. At this time, in this embodiment, as shown in the following formula, distribution is performed by multiplying the remaining power (remainder_PV1) of the power generated by the solar power generation facility PV1 by the distribution coefficients k_12 to k_14 for each of the buildings A1 to A4. Further, when the remaining power (remainder_A2, remainder_A3, remainder_A4) of the load power of each of the buildings A2 to A4 is smaller than the value obtained by multiplying the remaining power (remainder_PV1) of the power generated by the solar power generation facility PV1 by the distribution coefficients k_12 to k_14, power transmission is performed only for the remaining power (remainder_A2, remainder_A3, remainder_A4) of the load power of each of the buildings A2 to A4. This relationship can be represented by the following relational expression (7).

[0059] [Number]

[0060] The distribution coefficients k_12 to k_14 are obtained as follows using the differences (target_rate_A2 - accumulated_rate_A2, target_rate_A3 - accumulated_rate_A3, target_rate_A4 - accumulated_rate_A4) between the target renewable energy rates (target_rate_A2, target_rate_A3, target_rate_A4) and the cumulative renewable energy rates (accumulated_rate_A2, accumulated_rate_A3, accumulated_rate_A4) of each of the buildings A2 to A4.

[0061] [Number]

[0062] Note that the target renewable energy rates (target_rate_A2, target_rate_A3, target_rate_A4) of Buildings A1 to A4 are predetermined. Also, the cumulative renewable energy rates (accumulated_rate_A2, accumulated_rate_A3, accumulated_rate_A4) are obtained by ((cumulative value of renewable energy consumed in the building during the target period / cumulative value of building load power during the target period) × 100).

[0063] The distribution coefficients k_12 to k_14 are coefficients such that the greater the difference between the target renewable energy rate and the cumulative renewable energy rate, the greater the power to be distributed. As a result, each of Buildings A1 to A4 can be brought closer to the target renewable energy rate.

[0064] The remaining power for distribution of the power generated by the solar power generation facility PV1 (remainder_PV1) is obtained by subtracting the power distributed from the solar power generation facility PV1 to the loads L2 to L4 of Buildings A2 to A4 (transaction_PV1_to_A2, transaction_PV1_to_A3, transaction_PV1_to_A4) from the remaining power for distribution of the power generated by the solar power generation facility PV1 (remainder_PV1) up to that point. This relationship can be represented by the following relational expression (8).

[0065]

Equation

[0066] Also, the remaining power of the distributed load power of Buildings A2 to A4 (remainder_A2, remainder_A3, remainder_A4) is obtained by subtracting the distributed power from the solar power generation facility PV1 to the loads L2 to L4 of Buildings A2 to A4 (transaction_PV1_to_A2, transaction_PV1_to_A3, transaction_PV1_to_A4) from the remaining power of the distributed load power of Buildings A2 to A4 (remainder_A2, remainder_A3, remainder_A4) up to now. This relationship can be expressed by the following relational expression (9).

[0067]

Number

[0068] The distribution from the solar power generation facility PV1 to Buildings A2 to A4 can be performed until the remaining power of the generated power of the solar power generation facility PV1 (remainder_PV1) becomes "0".

[0069] Information on power transactions such as the distributed power from the solar power generation facility PV1 to Buildings A2, A3, and A4 (transaction_PV1_to_A2, transaction_PV1_to_A3, transaction_PV1_to_A4), the remaining power of the generated power of the solar power generation facility PV1 (remainder_PV1), and the remaining power of the distributed load power of Buildings A2 to A4 (remainder_A2, remainder_A3, remainder_A4) is obtained by calculating the hash value with the previous block, connecting the blockchain, and sharing it in a distributed ledger. It is stored in the blockchain platform 10 in the blockchain.

[0070] In the above description, the case where the remaining power of the power generation facility using renewable energy in the consumer facility is distributed to neighboring consumer facilities has been described. However, the present invention can be similarly applied to the case where the power of the supplier facility that generates power using renewable energy is distributed to the consumer facility. That is, in the above example, the case where the remaining power of the generated power of the solar power generation facility PV1 in Building A1 is distributed to other consumer buildings A2 to A4 has been described. However, the same power distribution can be performed when transmitting renewable energy power from the facilities of the supplier facility 20 (grid power utility S1, biomass power generation company S2, megasolar power generation company S3) to the buildings (Buildings A1 to A3) of the consumer facility 30.

[0071] All or part of the power management device 1 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize it. Here, the "computer system" shall include hardware such as an OS and peripheral devices. Also, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, magneto-optical disk, ROM, CD-ROM, etc., and a storage device such as a hard disk built into the computer system. Furthermore, the "computer-readable recording medium" refers to something that dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and may also include something that holds a program for a certain period of time, like the volatile memory inside the computer systems that become the server and client in that case. Also, the above program may be for realizing a part of the above-described functions, and may further be realized in combination with a program already recorded in the computer system for the above-described functions, and may also be realized using a programmable logic device such as an FPGA.

[0072] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and designs and the like within the scope not departing from the gist of the present invention are also included.

Description of Reference Numerals

[0073] 10…Blockchain platform, 20…Supplier facility, 30…Demander facility

Claims

1. A distribution coefficient calculation unit that obtains a distribution coefficient for each consumer facility receiving power supply based on the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility; A distribution unit that distributes power generated by renewable energy to the consumer facilities to be distributed according to the distribution coefficients of the respective consumer facilities; A registration unit that requests registration of power transaction data related to the distributed power in a distributed ledger and comprising: The distribution coefficient is set such that the greater the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility receiving the power supply, the greater the coefficient. Power management device.

2. The power management device according to claim 1, wherein the power to be distributed is the remaining distributed power of a consumer having power generation equipment using renewable energy.

3. The power management device according to claim 1, wherein the power to be distributed is the power of a supplier facility that generates power using renewable energy.

4. A power management method executed by a computer, comprising: Obtaining a distribution coefficient for each consumer facility receiving power supply based on the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility; Distributing power generated by renewable energy to the consumer facilities to be distributed according to the distribution coefficients of the respective consumer facilities; Requesting registration of power transaction data related to the distributed power in a distributed ledger including: The distribution coefficient is set such that the greater the difference between the target renewable energy rate and the cumulative renewable energy rate of each consumer facility receiving the power supply, the greater the coefficient. Power management method.

Images