Power management system, power management method and program

Abstract

To provide a power management system, a method for managing power, and a program.SOLUTION: In a method for managing power of a power management system 10, when a power management server 200 extracts power selling facilities 100A to 100F and facilities 300A to 300C other than a power buying facility 100P from at least two facilities 100, 300 connected to a power system, the server properly realizes matching between power buying facilities and power selling facilities by ruling out facilities not connected to a low-pressure power line 421 to which a power selling facility is connected as a candidate of a power selling facility.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power management system, a power management method, and a program. [Background technology]

[0002] In recent years, a technology that utilizes distributed power sources installed in facilities in order to maintain the balance between power supply and demand in a power grid (for example, Virtual Power Plant (VPP) is known (for example, Patent Document 1)) has been known. Furthermore, as a method of utilizing distributed power sources installed in facilities, an electricity trading market that realizes the buying and selling of electricity has also been attracting attention. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-182399 A Summary of the Invention

[0004] A power management system according to a first feature is a power management system that provides a mechanism for buying and selling power between two or more facilities connected to a power grid. The power management system extracts power selling facilities other than power purchasing facilities from the two or more facilities, and when extracting the power selling facilities from the two or more facilities, excludes facilities that are not connected to a low-voltage power line to which the power purchasing facility is connected from candidates for the power selling facilities.

[0005] A power management system according to a second feature is a power management system that provides a mechanism for buying and selling power between two or more facilities connected to a power grid. The power management system extracts power selling facilities other than power purchasing facilities from the two or more facilities, and when extracting the power selling facilities from the two or more facilities, excludes facilities whose output capacity is smaller than the amount of power purchased from candidates for the power selling facilities.

[0006] A power management method according to a third feature is a method for providing a mechanism for buying and selling power between two or more facilities connected to a power grid. The power management method includes a step of extracting a power selling facility other than a power purchasing facility from the two or more facilities by a power management system, and a step of excluding a facility that is not connected to a low-voltage power line to which the power purchasing facility is connected from candidates for the power selling facility by the power management system.

[0007] A fourth feature of the power management method is a method for providing a mechanism for buying and selling power between two or more facilities connected to a power grid. The power management method includes a step of extracting a power selling facility other than a power purchasing facility from among the two or more facilities by a power management system, and a step of excluding a facility whose output capacity is smaller than the amount of power purchased by the power management system from candidates for the power selling facility.

[0008] A program according to a fifth feature is a program that provides a mechanism for buying and selling electricity between two or more facilities connected to an electric power grid. The program causes a computer to execute the steps of extracting electricity selling facilities other than electricity purchasing facilities from among the two or more facilities, and excluding facilities that are not connected to a low-voltage power line to which the electricity purchasing facility is connected from candidates for the electricity selling facilities.

[0009] A sixth feature of the present invention is a program for providing a mechanism for buying and selling electricity between two or more facilities connected to an electric power grid, the program causing a computer to execute the steps of: extracting electricity selling facilities other than electricity purchasing facilities from among the two or more facilities; and excluding facilities whose available output amount is smaller than the amount of electricity purchased from candidates for the electricity selling facilities. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a power management system 10 according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing a power management server 200 according to the embodiment. [Diagram 3]FIG. 3 is a diagram for explaining the evaluation value according to the embodiment. [Figure 4] FIG. 4 is a diagram for explaining the score value according to the embodiment. [Diagram 5] FIG. 5 is a diagram illustrating a power management method according to the embodiment. [Figure 6] FIG. 6 is a diagram showing a power management system 10 according to a modified example. [Figure 7] FIG. 7 is a diagram for explaining the score value according to the modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In the above-mentioned electricity trading market, electricity buying and selling is realized by matching electricity selling bids and electricity buying bids. In general, since the power consumption of a facility can be covered by a base power source connected to a high-voltage power grid or the like, the above-mentioned matching does not require real-time performance and can be performed virtually.

[0012] However, when considering a case where electricity is traded in real time between facilities whose power path distance to the base power source is equal to or greater than a threshold (for example, facilities connected to a low-voltage power grid), the base power source may not be able to quickly cover the power consumption of the facilities. Therefore, if the timing of the reverse power flow from the facility to the power grid (power selling bid) and the timing of the power flow from the power grid to the facility (power buying bid) are not synchronized, the power supply and demand balance of the power grid in the area where the facility is located may be disrupted.

[0013] Therefore, the present disclosure has been made to solve the above-mentioned problems, and provides a power management system and a power management method that enable appropriate matching between power purchasing facilities and power selling facilities.

[0014] Hereinafter, embodiments will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[0015] However, it should be noted that the drawings are schematic and the ratios of the dimensions may differ from the actual ones. Therefore, the specific dimensions should be determined with reference to the following explanation. In addition, the drawings may of course include parts with different dimensional relationships or ratios.

[0016] [Embodiment] The power management system according to the embodiment will be described below. The power management system 10 includes a facility 100, a power management server 200, a facility 300, a network 410, a substation facility 420, and a user terminal 500.

[0017] The facility 100 is connected to a low-voltage power line. The low-voltage power line is an example of a power system, and is a power line corresponding to a voltage lower than that of a high-voltage power line. Although not particularly limited, the facility 100 is a relatively small-scale facility. For example, the facility 100 has load equipment such as air conditioners, lighting equipment, and AV (Audio Visual) equipment. The facility 100 may also have distributed power sources such as solar cell devices, storage battery devices, and fuel cell devices.

[0018] For example, facility 100P does not have a distributed power source. Facility 100A has a solar cell device. Facility 100B has a solar cell device and a storage battery device. Facility 100C has a solar cell device. Facility 100D has a solar cell device, a storage battery device and a fuel cell device. Facility 100E has a solar cell device and a storage battery device. Facility 100F does not have a distributed power source.

[0019] Here, facility 100P, facility 100A, facility 100B, and facility 100C are connected to the same low-voltage power line 421. Facility 100D, facility 100E, and facility 100F are connected to the same low-voltage power line 422. The low-voltage power line 421 and the low-voltage power line 422 branch off at a substation 420, and may be considered as different low-voltage power lines.

[0020] Hereinafter, the flow of power from the low-voltage power line to the facility 100 may be referred to as a power flow. The flow of power from the facility 100 to the low-voltage power line may be referred to as a reverse power flow.

[0021] The power management server 200 is a server that provides a mechanism for buying and selling power between two or more facilities. Specifically, the power management server 200 performs matching between a power buying facility that wishes to purchase power and a power selling facility that wishes to sell power. In the embodiment, the facility 100P is an example of a power buying facility. The facilities 100A to 100F are candidates for power selling facilities. The facilities 300A to 300C described below may also be candidates for power selling facilities.

[0022] The power management server 200 may be a server managed by a power company such as a power generation company, a power transmission and distribution company, a retail company, or a resource aggregator. The resource aggregator is a power company that provides reverse flow power to a power generation company, a power transmission and distribution company, a retail company, and the like in a VPP (Virtual Power Plant). The resource aggregator may be a power company that generates surplus power (negawatts) by reducing the power consumption of a facility managed by the resource aggregator. Such surplus power may be regarded as generated power. The resource aggregator may be a power company that absorbs excess power due to an increase in power consumption of a facility managed by the resource aggregator (for example, an increase in the amount of charge of a storage battery device).

[0023] The power management server 200 transmits a control message to the facility 100 instructing the facility 100 to control the distributed power sources installed in the facility 100. For example, the power management server 200 may transmit a power flow control message (e.g., DR; Demand Response) requesting control of a power flow. The power management server 200 may transmit a reverse flow control message requesting control of a reverse flow. Furthermore, the power management server 200 may transmit a power source control message to control the operating state of the distributed power source. The degree of control of the power flow or reverse flow may be expressed as an absolute value (e.g., XX kW) or a relative value (e.g., XX%). Or The degree of control of the power flow or reverse flow may be expressed by two or more levels. The degree of control of the power flow or reverse flow may be expressed by the power rate (RTP; Real Time Pricing) determined by the current power supply and demand balance. The degree of control of the power flow or reverse flow may be expressed by the power rate (TOU; Time Of Use) determined by the past power supply and demand balance.

[0024] The facility 300 is connected to a high-voltage power line. The high-voltage power line is an example of a power system, and is a power line corresponding to a voltage higher than that of a low-voltage power line. Although not particularly limited, the facility 300 is a relatively large facility.

[0025] For example, facility 300A is a thermal power plant. Facility 300B is a nuclear power plant. Facility 300C is a wind power plant. However, facility 300 may be a facility having a large number of solar cell devices. Facility 300 may be a facility having a large number of storage battery devices. Facility 300A to facility 300C are examples of base power sources.

[0026] The network 410 is a network that connects the facility 100, the power management server 200, and the facility 300. Although not particularly limited, the network 410 may be a dedicated line such as a VPN (Virtual Private Network).

[0027] The substation equipment 420 is equipment that converts the voltage of a high-voltage power line into the voltage of a low-voltage power line. A plurality of low-voltage power lines may be connected to the substation equipment 420. A plurality of high-voltage power lines may be connected to the substation equipment 420.

[0028] The user terminal 500 is a terminal that belongs to a user of the facility 100P. The user terminal 500 may be a terminal such as a personal computer, a smartphone, or a tablet PC.

[0029] In the embodiment, communication between the power management server 200 and the facility 100 may be performed according to a first protocol. Meanwhile, communication between the facility 100 and the distributed power source may be performed according to a second protocol different from the first protocol. Furthermore, communication between the power management server 200 and the distributed power source may be performed according to the first protocol. For example, the first protocol may be a protocol conforming to Open ADR (Automated Demand Response) or a unique dedicated protocol. For example, the second protocol may be a protocol conforming to ECHONET Lite (registered trademark), SEP (Smart Energy Profile) 2.0, KNX, or a unique dedicated protocol.

[0030] (Power Management Server) The power management server according to the embodiment will be described below. As shown in FIG.

[0031] The management unit 210 is configured with a storage medium such as a non-volatile memory and / or a HDD, and manages data related to two or more facilities 100 managed by the power management server 200. The two or more facilities 100 managed by the power management server 200 may be facilities 100 that have a contract with an entity that manages the power management server 200. For example, the data related to the facilities 100 may be the demand power supplied to the facilities 100 from the power system. The data related to the facilities 100 may be the amount of power reduced in each facility 100 in response to a demand response (DR) for reducing the demand power of the entire power system. The data related to the facilities 100 may be the type of distributed power source provided in the facilities 100, the specifications of the distributed power source provided in the facilities 100, and the like. The specifications may be the rated power generation (W) of the solar cell device, the maximum output power (W) of the storage battery device, and the maximum output power (W) of the fuel cell device. Furthermore, the data related to the facility 100 may be the amount of output power instructed to the distributed power source in the past. For example, when the distributed power source is a storage battery device, the data on the facility 100 may be the amount of discharged power instructed to the storage battery device. The data on the facility 100 may be the degree of deterioration of the distributed power source. For example, when the distributed power source is a storage battery device, the data on the facility 100 may be the SOH (State Of Health) of the storage battery device.

[0032] In an embodiment, the management unit 210 manages evaluation values ​​associated with power sources that supply power to the power purchasing facility, as shown in Fig. 3. The power sources are solar cell devices, storage battery devices, fuel cell devices, thermal power plants, nuclear power plants, wind power plants, etc. The management unit 210 may manage index values ​​used in calculating the evaluation values. The index values ​​are stability, expected value, CO2 emissions, distributed power sources, operation costs, damage risk, etc.

[0033] Stability is an index value related to the degree to which the supply of electricity can be continued stably. Battery storage devices, whose remaining charge can fluctuate, solar cell devices, whose power generation can fluctuate with the amount of solar radiation, and wind power plants, whose power generation can fluctuate with the amount of wind, are considered to have relatively low stability index values.

[0034] The expected value is an index value relating to the degree to which power supply can be expected. The expected value index value is considered to be relatively low for solar cell devices, storage battery devices, and fuel cell devices, which are affected by the power consumption, remaining charge, amount of solar radiation, etc. of the facility 100. The expected value index value is considered to be relatively low for wind power plants, where the amount of power generation can vary depending on the wind speed.

[0035] The CO2 emissions are index values ​​related to the amount of CO2 emitted by the power source. Since fuel cell devices and thermal power plants are considered to emit a large amount of CO2, their index values ​​for CO2 emissions are considered to be relatively low.

[0036] Distributed power source is an index value that indicates whether the power source is a distributed power source. If the power source is a distributed power source, it is expected that the power source will be locally produced and locally consumed, and therefore the index value of the distributed power source is considered to be high.

[0037] The operating cost is an index value related to the operating cost of the power source. For solar cell devices and wind power plants, the index value of the operating cost is considered to be high because they use natural energy.

[0038] Damage risk is an index value related to the risk of damage from disasters. For thermal power plants and nuclear power plants, the index value of damage risk is considered to be low because the damage from disasters is large-scale.

[0039] In Fig. 3, the evaluation value associated with the power source used for selling power is determined based on the stability, the expected value, the amount of CO2 emissions, the operating cost, and the risk of damage. However, the embodiment is not limited to this. The evaluation value associated with the power source used for selling power may be determined based on at least one of the stability, the expected value, the amount of CO2 emissions, the operating cost, and the risk of damage.

[0040] The communication unit 220 is configured by a communication module, and communicates with the relocation facility 100 via the network 400. As described above, the communication unit 220 communicates according to the first protocol. For example, the communication unit 220 transmits a first message to the facility 100 according to the first protocol. The communication unit 220 receives a first message response from the facility 100 according to the first protocol.

[0041] In the embodiment, the communication unit 220 communicates with the user terminal 500. The communication unit 220 receives a message (score value request) requesting a score value of a power source provided in the power selling facility from the user terminal 500. The communication unit 220 transmits a message (score value response) including the score value of the power source provided in the power selling facility to the user terminal 500. In other words, the communication unit 220 constitutes a notification unit that notifies the user terminal 500 of the score value.

[0042] The control unit 230 is configured with a memory, a CPU, etc., and controls each component provided in the power management server 200. For example, the control unit 230 instructs the facility 100 to control the distributed power sources provided in the facility 100 by transmitting a control message. As described above, the control message may be a power flow control message, a reverse power flow control message, or a power source control message.

[0043] In an embodiment, the control unit 230 extracts a power selling facility other than the power buying facility from among two or more facilities based on an input from a user terminal 500 corresponding to the power buying facility (e.g., facility 100P). The control unit 230 calculates a score value indicating the value of buying and selling electricity based on a communication time in a communication path between the power selling facility and the power buying facility.

[0044] For example, the input from the user terminal 500 is the score value request described above. The score value request may include information elements that specify all or part of the power selling facilities that can supply power to the power purchasing facility. The information elements that specify the part of the power selling facilities may include information elements that indicate a condition that the distance of the power path to the base power source is equal to or greater than a threshold. Such information elements may include information elements that indicate a condition that the facility is connected to a low-voltage power line. The information elements that specify the part of the power selling facilities may include information elements that indicate a condition that the facility is connected to a low-voltage power line to which the power purchasing facility is connected. The information elements that specify the part of the power selling facilities may include information elements that indicate conditions such as high stability, high expected value, low CO2 emissions, a power source that is a distributed power source, low operating costs, and low risk of damage.

[0045] For example, the communication time in the communication path may be expressed as an RTT (Round Trip Time) between the power selling facility and the power buying facility. In the embodiment, since the communication path between the power selling facility and the power buying facility passes through the power management server 200, the RTT between the power selling facility and the power buying facility is the sum of the RTT between the power selling facility and the power management server 200 and the RTT between the power buying facility and the power management server 200.

[0046] For example, consider a case where the facility 100P is a power buying facility, and the facilities 100A to 100F and the facilities 300A to 300C are candidates for power selling facilities.

[0047] As shown in Fig. 4, the control unit 230 calculates a score value indicating the value of buying and selling electricity by correcting the evaluation value shown in Fig. 3 with the communication time (RTT) in the communication path. Specifically, the control unit 230 corrects the evaluation value so that the score value becomes higher as the RTT becomes shorter.

[0048] In the embodiment, the evaluation values ​​shown in Fig. 3 differ depending on the type of power source, and therefore, the control unit 230 calculates the score value based on the type of power source.

[0049] In the embodiment, the evaluation value shown in Fig. 3 is determined based on at least one of the stability, the expected value, the amount of CO2 emissions, the operating cost, and the risk of damage. Therefore, the control unit 230 calculates the score value based on at least one of the stability, the expected value, the amount of CO2 emissions, the operating cost, and the risk of damage.

[0050] The control unit 230 may exclude facilities whose electric power path distance to the base power source is less than a threshold value from candidates for the electric power selling facility. For example, the control unit 230 may exclude the facilities 300A to 300C from the candidates for the electric power selling facility. The exclusion may be a process of calculating the score value as zero, or may be a process of not extracting the facilities as electric power selling facilities.

[0051] The control unit 230 may exclude facilities that are not connected to the low-voltage power line to which the power buying facility is connected from candidates for the power selling facility. That is, in this case, the power selling facility is a facility that is connected to the low-voltage power line to which the power buying facility is connected. For example, the control unit 230 may exclude the facilities 100D to 100F from the candidates for the power selling facility. The exclusion may be a process of calculating the score value as zero, or may be a process of not extracting them as power selling facilities.

[0052] The control unit 230 may calculate the score value based on the amount of power that can be output from the power source (hereinafter, the available output amount). When the power source is a distributed power source, the available output amount may be the amount of power that the distributed power source can provide a reverse power flow. For example, the control unit 230 calculates the score value so that the score value becomes lower as the available output amount is smaller than the amount of purchased power requested by the user of the power buying facility. The control unit 230 may exclude facilities whose available output amount is smaller than the amount of purchased power from candidates for power selling facilities.

[0053] (Power management method) A power management method according to an embodiment will be described below.

[0054] 5, in step S10, the user terminal 500 transmits a message (score value request) requesting score values ​​of power sources provided in the power selling facility to the power management server 200. As described above, the score value request may include information elements specifying all or some of the power selling facilities that can supply power to the power buying facility.

[0055] In step S20, the power management server 200 extracts power selling facilities other than the power buying facility from among two or more facilities based on an input from the user terminal 500 corresponding to the power buying facility.

[0056] In step S30, the power management server 200 calculates a score value indicating the value of buying and selling electricity based on the communication time in the communication path between the power selling facility and the power buying facility. For example, the power management server 200 calculates the score value shown in Fig. 4. The method of calculating the score value is as described above, and the details thereof will be omitted.

[0057] In step S40, the power management server 200 transmits to the user terminal 500 a message (score value response) including the score value of the power source provided in the power selling facility.

[0058] In step S50, the user terminal 500 transmits a message (power purchase request) including an information element indicating the power selling facility selected by the user to the power management server 200. Here, in response to receiving the score value response, the user terminal 500 may display a list of score values ​​shown in FIG. 4 to allow the user to select a power selling facility.

[0059] In step S60, when matching between the power buying facility and the power selling facility is established, the power management server 200 transmits a message (power purchase response) including an information element indicating that matching has been established to the user terminal 500. When matching between the power buying facility and the power selling facility is not established, the power management server 200 may transmit a message (power purchase response) including an information element indicating that matching has not been established to the user terminal 500. In the following description, it is assumed that matching has been established.

[0060] In step S70, the power management server 200 transmits, to the power selling facility, a message (output instruction) instructing the power selling facility selected by the user to output power from the power selling facility.

[0061] In step S80, the power selling facility outputs power to the power grid. In Fig. 5, for clarity of explanation, a diagram is shown in which power is supplied from the power selling facility to the power buying facility, but this is not intended to directly supply power from the power selling facility to the power buying facility via a dedicated power line. The operation of outputting power from the power selling facility to the power grid and the operation of supplying power from the power grid to the power buying facility may be performed separately, and in the case of buying and selling power in real time, these operations may be performed at approximately the same timing when matching is established.

[0062] (Action and Effects) In the embodiment, the power management server 200 calculates a score value indicating the value of buying and selling power based on the communication time in the communication path between the power selling facility and the power buying facility. With such a configuration, in the case of buying and selling power in real time, matching between the power buying facility and the power selling facility can be appropriately realized.

[0063] For example, in the case of providing a system for buying and selling electricity between two or more facilities whose power route distance to a base power source is equal to or greater than a threshold, it is possible to suppress imbalances in power supply and demand caused by discrepancies between the timing of reverse flow and the timing of power flow.

[0064] [Example of change] Modifications to the embodiment will be described below, with differences from the embodiment being mainly described below.

[0065] In the embodiment, the case where the RTT is used as the communication time in the communication path has been described, whereas in the modified example, the case where the number of hops is used as the communication time in the communication path will be described.

[0066] As shown in Fig. 6, in the power management system 10, the facility 100 constitutes an ad-hoc network constituted by a wireless communication network. The ad-hoc network may be constituted by a wired communication network instead of a wireless communication network. In such a case, the communication path between the power buying facility and the power selling facility does not need to go through the power management server 200.

[0067] In such a case, the power management server 200 manages the number of hops between the facilities 100. The number of hops is represented by the number of facilities 100 provided on the communication path. The number of hops may be notified from the facilities 100.

[0068] Specifically, as shown in Fig. 7, power management server 200 calculates a score value indicating the value of buying and selling electricity by correcting the evaluation value shown in Fig. 3 by the communication time (number of hops) in the communication path. Specifically, control unit 230 corrects the evaluation value so that the score value is higher as the number of hops is smaller. In other words, power management server 200 may generate a list of score values ​​shown in Fig. 7 instead of the list of score values ​​shown in Fig. 4.

[0069] [Other embodiments] Although the present disclosure has been described by the above-mentioned embodiments, the descriptions and drawings forming a part of this disclosure should not be understood as limiting the present invention. Various alternative embodiments, examples and operating techniques will become apparent to those skilled in the art from this disclosure.

[0070] In the embodiment, the power purchase request includes an information element indicating the power selling facility selected by the user. However, the embodiment is not limited thereto. The power purchase request may include an information element indicating the power source selected by the user in addition to the information element indicating the power selling facility selected by the user. That is, when the power selling facility has two or more types of power sources, the score values ​​of the two or more types of power sources are different, so that the user may be able to select the power source provided in the power selling facility.

[0071] Although not specifically mentioned in the embodiment, the user terminal 500 may be considered to be synonymous with the power buying facility. In such a case, the user terminal 500 may be a terminal provided in the power buying facility. The communication time in the communication path may be the communication time in the communication path between the user terminal 500 and the power selling facility.

[0072] Although not specifically mentioned in the embodiment, the user terminal 500 may be a terminal staying or planning to stay at the power buying facility. For example, such a usage scene may be a usage scene in which the user of the user terminal 500 charges an electric vehicle at a friend's house when the power buying facility is a friend's house, or a usage scene in which the user of the user terminal 500 charges a smartphone at a restaurant when the power buying facility is a restaurant.

[0073] In the embodiment, the evaluation value is determined based on at least one of the stability, the expected value, the CO2 emission amount, the operation cost, and the damage risk. However, the embodiment is not limited thereto. The evaluation value may be set by a user of the power purchasing facility. The evaluation value may be determined in advance.

[0074] In the embodiment, the extraction of the power selling facility and the calculation of the score value are performed by the power management server 200. However, the embodiment is not limited to this. The extraction of the power selling facility and the calculation of the score value may be performed by any device connected to the network 410. The extraction of the power selling facility and the calculation of the score value may be performed by cooperation between two or more devices. The extraction of the power selling facility and the calculation of the score value may be performed by the user terminal 500, by a terminal belonging to one or more users of the power selling facility, or by a cloud server accessible to two or more user terminals.

[0075] The entire contents of Japanese Patent Application No. 2018-156876 (filed on August 24, 2018) are incorporated by reference into this application.

Claims

1. An electric power management system that provides a mechanism for matching electric power buying and selling between two or more facilities connected to an electric power grid, comprising: Extracting electricity selling facilities other than electricity purchasing facilities from the two or more facilities; When extracting the power selling facility from the two or more facilities, a facility that is not connected to the low-voltage power line to which the power purchasing facility is connected is excluded from the candidates for the power selling facility even if the facility is connected to a low-voltage power line. Power management system.

2. Receiving a message including a predetermined condition regarding the power selling facility from the power purchasing facility; extracting the power selling facility in response to the message; The power management system of claim 1 .

3. An electric power management system that provides a mechanism for buying and selling electric power between two or more facilities connected to an electric power grid, comprising: Extracting electricity selling facilities other than electricity purchasing facilities from the two or more facilities; When extracting the power selling facility from the two or more facilities, a facility that is not connected to a low-voltage power line to which the power purchasing facility is connected is excluded from candidates for the power selling facility; The exclusion is a process of calculating a score value indicating the value of the electricity trading as zero. Power management system.

4. The exclusion is a process of not extracting the facility as a power selling facility. The power management system of claim 1 .

5. A power management method for providing a mechanism for matching power buying and selling between two or more facilities connected to a power grid, comprising: A step in which the power management system extracts a power selling facility other than the power purchasing facility from the two or more facilities; The power management system excludes a facility that is not connected to the low-voltage power line to which the power purchasing facility is connected from candidates for the power selling facility, even if the facility is connected to a low-voltage power line. Power management methods.

6. A power management method for providing a mechanism for buying and selling power between two or more facilities connected to a power grid, comprising: A step in which the power management system extracts a power selling facility other than the power purchasing facility from the two or more facilities; The power management system excludes facilities that are not connected to a low-voltage power line to which the power purchasing facility is connected from candidates for the power selling facility, The exclusion is a process of calculating a score value indicating the value of the electricity trading as zero. Power management methods.

7. A program that provides a mechanism for matching the buying and selling of electricity between two or more facilities connected to an electric power grid, On the computer, A step of extracting an electricity selling facility other than an electricity purchasing facility from the two or more facilities; a procedure for excluding a facility that is not connected to the low-voltage power line to which the power purchasing facility is connected from candidates for the power selling facility, even if the facility is connected to a low-voltage power line; program.

8. A program for providing a mechanism for buying and selling electricity between two or more facilities connected to an electric power grid, comprising: On the computer, A step of extracting an electricity selling facility other than an electricity purchasing facility from the two or more facilities; and excluding, from candidates for the power selling facility, facilities that are not connected to a low-voltage power line to which the power purchasing facility is connected; The exclusion is a process of calculating a score value indicating the value of the electricity trading as zero. program.

Images