Power management system, display device, power management method, and program

Abstract

To appropriately display a power amount of self-consignment between grids.MEANS FOR SOLVING THE PROBLEM: A power management system for managing power transmission by means of self-consignment between a plurality of grids via a power system comprises: a management unit for managing a self-consigned power amount being a power amount transmitted from a power transmission-side grid to a power reception-side grid by self-consignment; and a control unit for displaying the self-consigned power amount in a display device. When displaying the self-consigned power amount for the power transmission-side grid, the control unit regards the self-consigned power amount as a power consumption amount of the power transmission-side grid to display it on the display device.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Conventionally, self-dispatch has been known, in which electricity is transmitted from a distributed power source to an electricity demand facility (or, from another perspective, an electricity load) that belongs to the same entity as the distributed power source via a power system managed by a power transmission and distribution company or the like (see, for example, Patent Document 1).

[0003] Also known is a microgrid that is connected to a power grid and has distributed power sources and power loads that consume the output power of the distributed power sources (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-87278 [Patent Document 2] Japanese Patent Publication No. 2022-13180 Summary of the Invention [Problem to be solved by the invention]

[0005] In order for users to understand data related to electricity, it is important to "visualize electricity," and it is preferable to display graphs showing the amount of electricity generated by distributed power sources and graphs showing the amount of electricity consumed by power loads on a display device. However, when self-consignment is performed between grids such as microgrids, the amount of self-consignment electricity may be perceived differently on the power transmitting side and the power receiving side, which means that there is a problem in that a unique method for displaying the amount of self-consignment electricity cannot be determined.

[0006] An object of the present invention is to provide a power management system, a display device, a power management method, and a program that can appropriately display the amount of power self-consignment between grids. [Means for solving the problem]

[0007] A power management system according to a first aspect is a system for managing power transmission performed by self-dispatch between multiple grids via a power system. The power management system includes a management unit that manages a self-dispatch power amount, which is the amount of power transmitted from a power transmitting grid to a power receiving grid by the self-dispatch, and a control unit that displays the self-dispatch power amount on a display device. When displaying the self-dispatch power amount for the power transmitting grid, the control unit displays the self-dispatch power amount on the display device, regarding the self-dispatch power amount as the amount of power consumed by the power transmitting grid.

[0008] A power management system according to a second aspect is a system for managing power transmission performed by self-consignment between multiple grids via a power system. The power management system includes a management unit that manages a self-consignment power amount, which is the amount of power transmitted from a power transmitting grid to a power receiving grid by the self-consignment, and a control unit that displays the self-consignment power amount on a display device. When displaying the self-consignment power amount for the power receiving grid, the control unit displays the self-consignment power amount on the display device, regarding it as the amount of power generated by the power receiving grid.

[0009] A display device according to a third aspect is a device used in a power management system that manages power transmission between multiple grids through a power system by self-dispatching. The display device includes a display unit that displays a self-dispatched power amount, which is the amount of power transmitted from a power transmitting grid to a power receiving grid by the self-dispatched power. When displaying the self-dispatched power amount for the power transmitting grid, the display unit displays the self-dispatched power amount as the amount of power consumed by the power transmitting grid.

[0010] A display device according to a fourth aspect is a device used in a power management system that manages power transmission between multiple grids through a power system by self-consignment. The display device includes a display unit that displays a self-consignment power amount, which is the amount of power transmitted from a power transmitting grid to a power receiving grid by the self-consignment. When displaying the self-consignment power amount for the power receiving grid, the display unit displays the self-consignment power amount as the amount of power generated by the power receiving grid.

[0011] A power management method according to a fifth aspect is a method used in a power management system that manages power transmission performed by self-dispatching between multiple grids via a power system. The power management method includes a step of displaying a self-dispatched power amount, which is the amount of power transmitted from a transmitting grid to a receiving grid by the self-dispatched power. When displaying the self-dispatched power amount for the transmitting grid, the displaying step includes a step of displaying the self-dispatched power amount as the amount of power consumed by the transmitting grid.

[0012] A sixth aspect of the present invention relates to a power management method for use in a power management system that manages power transmission between multiple grids via a power system by self-dispatching. The power management method includes a step of displaying a self-dispatched power amount, which is the amount of power transmitted from a power transmitting grid to a power receiving grid by the self-dispatched power. When displaying the self-dispatched power amount for the power receiving grid, the displaying step includes a step of displaying the self-dispatched power amount as the amount of power generated by the power receiving grid.

[0013] A program according to a seventh aspect causes a display device used in an energy management system that manages energy transmission between a plurality of grids through a power system to execute a step of displaying a self-consigned energy amount, which is an amount of energy transmitted from a transmitting grid to a receiving grid through the self-consigned energy amount. When the self-consigned energy amount is displayed for the transmitting grid, the display device is caused to regard the self-consigned energy amount as an amount of power consumed by the transmitting grid.

[0014] A program according to an eighth aspect causes a display device used in an energy management system that manages energy transmission between a plurality of grids through a power system to execute a step of displaying a self-consigned energy amount, which is an amount of energy transmitted from a transmitting grid to a receiving grid through the self-consigned energy. When the self-consigned energy amount is displayed for the receiving grid, the display device is caused to regard the self-consigned energy amount as an amount of energy generated by the receiving grid. [Effects of the Invention]

[0015] According to one aspect of the present invention, it is possible to provide a power management system, a display device, a power management method, and a program that are capable of appropriately displaying the amount of power self-consignment between grids. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram illustrating an example of the overall configuration of a power management system according to an embodiment; [Figure 2] FIG. 1 illustrates an example of the configuration of a power management device according to an embodiment. [Figure 3] 1 is a diagram illustrating an example of the configuration of a display device according to an embodiment. [Figure 4] FIG. 2 is a diagram illustrating an operation flow of the power management system according to the embodiment. [Figure 5] FIG. 2 is a diagram illustrating an example of the operation of the power management system according to the first embodiment. [Figure 6] FIG. 10 is a diagram showing an example of display of power transmission side power data during a time period when power transmission is performed by self-consignment. [Figure 7] FIG. 10 is a diagram showing an example of display of power receiving side power data during a time period when power is received by self-consignment. [Figure 8] FIG. 10 is a diagram illustrating a first operation example of the power management system according to the second embodiment. [Figure 9] FIG. 10 is a diagram illustrating a second operation example of the power management system according to the second embodiment. [Figure 10]FIG. 10 is a diagram showing an example of display of power transmission-side power data in a time period when power is transmitted to two power receiving-side microgrids (other grids 1 and 2) by self-consignment. [Figure 11] FIG. 10 is a diagram showing an example of display of power receiving-side power data in a time period when power is received from two power transmitting-side microgrids (other grids 1 and 2) by self-consignment. [Figure 12] FIG. 10 is a diagram for explaining a third embodiment. [Figure 13] FIG. 11 is a diagram illustrating an example of the operation of a power management system according to a third embodiment. [Figure 14] FIG. 10 is a diagram illustrating an example of the operation of a power management system according to a fourth embodiment. [Figure 15] FIG. 13 is a diagram illustrating an example of the operation of a power management system according to a modification of the fourth embodiment. [Figure 16] FIG. 10 illustrates a modified example of the configuration of the power management system. DETAILED DESCRIPTION OF THE INVENTION

[0017] A power management system according to an embodiment will be described with reference to the drawings. In the drawings, identical or similar parts are denoted by identical or similar reference numerals. In the description of the embodiment, the "grid" is assumed to be a "microgrid," but the "grid" is not limited to a "microgrid" and may be, for example, a "large-scale grid."

[0018] (1) First embodiment (1.1) Configuration of the power management system First, a description will be given of the configuration of a power management system according to the first embodiment. Fig. 1 is a diagram showing an example of the overall configuration of a power management system 1 according to the first embodiment.

[0019] The power management system 1 shown in FIG. 1 includes a plurality of microgrids 100 (100a, 100b, 100c, etc.) connected to a power system 10, a plurality of display devices 200 (200a, 200b, 200c, etc.), and a power management device 300. Although three microgrids 100 (100a, 100b, 100c) are illustrated in FIG. 1, the number of microgrids 100 may be two, or four or more. The microgrids 100 and the power management devices 300 are connected to each other so as to be able to communicate with each other via a communication network 20. The communication network 20 includes at least one of a local area network (LAN), a wide area network (WAN), and the Internet.

[0020] Each microgrid 100 is located at a location geographically separated from other microgrids 100. That is, multiple microgrids 100 are located geographically dispersed. Each microgrid 100 may be a "facility" having distributed power sources 110 and / or power loads 120. Each microgrid 100 may be an "area (geographical range)" having distributed power sources 110 and / or power loads 120.

[0021] Each microgrid 100 belongs to the same entity. Here, "the same entity" is not limited to the case where the entities to which each microgrid 100 belongs are completely the same (for example, the cases where each microgrid 100 belongs to the same business operator or the same local government, etc.). For example, the case where the entity to which one microgrid 100 belongs and the entity to which another microgrid 100 belongs have such a close relationship that they can be considered to be the same entity (for example, a company and its group companies) is also included in "the same entity."

[0022] Each microgrid 100 is connected to a power system 10. The power system 10 is managed by an entity different from the entity to which each microgrid 100 belongs. The entity managing the power system 10 may be a power company, a power generation company, a power transmission and distribution company, or an electricity retailer that manages the power system 10.

[0023] In the first embodiment, each microgrid 100 has at least one distributed power source 110 and at least one power load 120. While the example in FIG. 1 shows an example in which each microgrid 100 has both the distributed power source 110 and the power load 120, any microgrid 100 may have only one of the distributed power source 110 and the power load 120. The distributed power source 110 includes a power generation facility such as a solar power generation facility and / or a fuel cell facility. The power generation facility may be a wind power generation facility, a geothermal power generation facility, and / or a biomass power generation facility. The distributed power source 110 may further include a storage battery facility. The power load 120 is a device that consumes (uses) power.

[0024] Here, it is assumed that each microgrid 100 has the same configuration, and the microgrid 100a will be described as an example. The microgrid 100a has a distributed power source 110a and a power load 120a connected to a power line 101a. The power line 101a may be a power line (e.g., a private line) managed by an entity to which the microgrid 100a belongs, or may be part of the power system 10. The power line 101a is connected to the power system 10 at a power receiving point 102a. The power load 120a consumes power supplied via the power line 101a, specifically, power supplied from the distributed power source 110a and / or power supplied from the power system 10. Similarly, the microgrid 100b has a distributed power source 110b and a power load 120b connected to the power line 101b (and the power receiving point 102b). The microgrid 100c includes a distributed power source 110c and a power load 120c connected to a power line 101c (and a power receiving point 102c).

[0025] In the power management system 1 shown in Fig. 1, each microgrid 100 has a display device 200 that displays power data related to the microgrid 100. For example, the microgrid 100a has a display device 200a that displays power data related to the microgrid 100a. Similarly, the microgrid 100b has a display device 200b that displays power data related to the microgrid 100b. The microgrid 100c has a display device 200c that displays power data related to the microgrid 100c.

[0026] Each display device 200 communicates with the power management device 300 via the communication network 20 and displays power data received from the power management device 300. The display device 200 may be, for example, a mobile terminal such as a smartphone, a tablet terminal, a notebook PC (PC), or a wearable terminal. The display device 200 may also be a stationary terminal such as a desktop PC or an electronic signboard.

[0027] In the power management system 1, power is transmitted from one microgrid 100 to another microgrid 100 via the power system 10 by self-wheeling. This makes it possible, for example, to efficiently consume surplus power, remaining after subtracting the power consumption of the power load 120 from the power output (generated) by the distributed power source 110 within one microgrid 100, in another microgrid 100. Furthermore, by performing self-wheeling from a power generation facility located in a remote location, it is possible to increase self-consumption across multiple bases. Furthermore, the ability to share generated power between bases can increase the proportion of renewable energy, contributing to the reduction of carbon dioxide emissions across a company and / or the entire group.

[0028] However, self-wheeling uses a power system 10 managed by an entity other than the entity to which each microgrid 100 belongs, such as a power company or a power transmission and distribution business operator, for power transmission. Therefore, when self-wheeling is used, a "planned value balancing" may be imposed. For example, if a difference (so-called "imbalance") of a threshold or more occurs between the planned value and the actual value per unit time of power output from a certain microgrid 100a (here, synonymous with power transmitted by self-wheeling), a penalty may be imposed on the entity to which the microgrid 100 belongs. The unit time may be, for example, 30 minutes. The imbalances for which a penalty is imposed may include a power transmission imbalance on the power transmitting side (i.e., the difference between the planned power transmission value and the actual power transmission value) and a power reception imbalance on the power receiving side (i.e., the difference between the planned power reception value and the actual power reception value).

[0029] The power management device 300 is a device that manages power data of each microgrid 100. The power management device 300 may manage the power data by collecting measurement data from smart meters and / or sensors provided in each microgrid 100. The sensors may be sensors provided in the distributed power sources 110 and / or the power loads 120. For each microgrid 100, the power management device 300 manages, for example, the amount of power generated by the distributed power sources 110, the amount of power consumed by the power loads 120, the amount of power purchased from the power grid 10 (flow power amount), and the amount of power self-dispatched (hereinafter referred to as "self-dispatched power amount"). Here, "power amount" is not limited to the accumulated power amount (kWh) for a certain period (e.g., 30 minutes) and may also be instantaneous power (kW). In the following, it is mainly assumed that the "power amount" is the accumulated power amount (kWh). Furthermore, the "power amount" is not limited to a measured value and may be a predicted value. In the following, it is mainly assumed that the "power amount" is a measured value.

[0030] The power management device 300 performs display control for "visualizing power" within each microgrid 100 based on the power data it manages. For example, the power management device 300 controls the display device 200a to display power data related to the microgrid 100a. The power management device 300 causes the display device 200a to display a graph showing the amount of power generated by the distributed power source 110a, a graph showing the amount of power consumed by the power load 120a, and / or a graph showing the amount of power purchased from the power system 10. Similarly, the power management device 300 controls the display device 200b to display power data related to the microgrid 100b. The power management device 300 controls the display device 200c to display power data related to the microgrid 100c.

[0031] In such display control, the self-consigned power amount may be perceived differently on the power transmitting side and the power receiving side, so there is no unique method for displaying the self-consigned power amount. Furthermore, since users of each microgrid 100 may have little knowledge about power management, it is desirable to be able to display the self-consigned power amount in a manner that is easy for users to understand.

[0032] (1.2) Power management device configuration Next, a description will be given of the configuration of the power management apparatus 300 according to the first embodiment.

[0033] 2 includes a communication unit 310, a management unit 320, and a control unit 330. The communication unit 310, the management unit 320, and the control unit 330 are connected by a bus 301.

[0034] The communication unit 310 performs data communication via the communication network 20 under the control of the control unit 330. The communication unit 310 has a transmitter for transmitting data and a receiver for receiving data. The communication unit 310 communicates with each microgrid 100 via the communication network 20. For example, the communication unit 310 receives measurement data from a smart meter and / or a sensor provided in each microgrid 100. The communication unit 310 also transmits power data to be displayed on the display device 200 to the display device 200.

[0035] The management unit 320 includes a memory unit 321 that stores data and manages power data of each microgrid 100. The memory unit 321 may be configured with various memories such as a read-only memory (ROM), a random access memory (RAM), and an auxiliary storage device. The memory unit 321 may store a program executed by the control unit 330.

[0036] The management unit 320 manages, as power data, a self-consignment power amount, which is the amount of power transmitted from the transmitting-side microgrid to the receiving-side microgrid by self-consignment. Hereinafter, the transmitting-side microgrid will be referred to as the "transmitting-side microgrid 100T," and the receiving-side microgrid will be referred to as the "receiving-side microgrid 100R." For example, when surplus power in the transmitting-side microgrid 100T is output from the transmitting-side microgrid 100T to the power grid 10 according to a power transmission plan, the management unit 320 may manage the amount of power output from the transmitting-side microgrid 100T to the power grid 10 as the transmitting-side self-consignment power amount. When the receiving-side microgrid 100R receives power from the power grid 10 according to a power receiving plan (procurement plan), the management unit 320 may manage the amount of power received by the receiving-side microgrid 100R from the power grid 10 as the receiving-side self-consignment power amount.

[0037] The management unit 320 may further manage, for each microgrid 100, the amount of power generated by the distributed power sources 110, the amount of power consumed by the power loads 120, and / or the amount of power purchased from the power grid 10 as power data. The management unit 320 may manage the self-consignment power and other power data (the amount of power generated, the amount of power consumed, and / or the amount of power purchased) for each unit time. The unit time may be 30 minutes. Here, the management unit 320 manages the self-consignment power amount in a manner that makes it possible to distinguish whether it is the self-consignment power amount of the power transmitting side or the self-consignment power amount of the power receiving side.

[0038] The control unit 330 includes at least one processor, and controls the communication unit 310 and the management unit 320 by executing a program stored in the storage unit 311. The at least one processor may be configured by a single integrated circuit (IC), or may be configured by multiple circuits (integrated circuits and / or discrete circuits, etc.) connected to each other so as to be able to communicate with each other.

[0039] The control unit 330 controls the communication unit 310 to transmit the power data managed by the management unit 320 to the display device 200 so as to display the power data managed by the management unit 320 on the display device 200. For example, the control unit 330 performs display control to display the self-transmitted power amount on the display device 200. The control unit 330 changes the display mode of the self-transmitted power amount when displaying the self-transmitted power amount for the power transmitting side microgrid 100T and when displaying the self-transmitted power amount for the power receiving side microgrid 100R. "Changing the display mode of the self-transmitted power amount" includes not only a method of changing the power type when displaying the self-transmitted power amount, as described in the first embodiment below, but also a method of changing the display of the allocation of the self-transmitted power amount, as described in the second embodiment below.

[0040] In this way, by displaying the self-consigned power amount for the power transmitting side microgrid 100T and the self-consigned power amount for the power receiving side microgrid 100R in different formats, it becomes possible to display the self-consigned power amount in a format appropriate for each of the power transmitting side and the power receiving side. Therefore, under the premise that the power transmitting side and the power receiving side may have different ways of understanding the self-consigned power amount, it is possible to display the self-consigned power amount appropriate for each of the power transmitting side and the power receiving side.

[0041] In the first embodiment, when displaying the self-consigned power amount for the power transmitting side microgrid 100T, the control unit 330 performs display control to display the self-consigned power amount as "power consumption amount" on the display device 200. For example, when outputting surplus power amount in the power transmitting side microgrid 100T to the power system 10, the control unit 330 controls the display device 200 to display the output power amount as power consumption amount.

[0042] As a result, even if a user of the power transmitting side microgrid 100T does not have knowledge about self-dispatch, the user can easily understand the amount of self-dispatch power on the power transmitting side as the amount of power consumption based on the display content of the display device 200. Furthermore, the user can understand that the surplus power in the power transmitting side microgrid 100T is being consumed in the power receiving side microgrid 100R, and the advantage of self-dispatch can be promoted to the user.

[0043] In the first embodiment, when displaying the self-consigned power amount for the power receiving-side microgrid 100R, the control unit 330 performs display control to display the self-consigned power amount as the "generated power amount" on the display device 200. For example, when the power receiving-side microgrid 100R receives power from the power system 10 separately from purchased power, the control unit 330 controls the display device 200 to display the received power amount as the generated power amount.

[0044] As a result, even if a user of the power receiving side microgrid 100R does not have knowledge about self-consignment, the user can easily understand the amount of self-consignment power on the power receiving side as the amount of generated power based on the display content of the display device 200. Furthermore, the user can understand that surplus power (generated power) in the power transmitting side microgrid 100T is being consumed, and the merits of self-consignment can be promoted to the user.

[0045] (1.3) Display device configuration Next, a description will be given of the configuration of the display device 200 according to the first embodiment.

[0046] 3 includes a communication unit 210, a display unit 220, an operation unit 230, a control unit 240, and a storage unit 250. The communication unit 210, the display unit 220, the operation unit 230, the control unit 240, and the storage unit 250 are connected by a bus 201.

[0047] The communication unit 210 performs data communication via the communication network 20 under the control of the control unit 240. The communication unit 210 has a transmitter for transmitting data and a receiver for receiving data. The communication unit 210 communicates with the power management apparatus 300 via the communication network 20. Such communication includes wireless communication and / or wired communication. For example, the communication unit 210 receives power data to be displayed on the display unit 220 from the power management apparatus 300.

[0048] The display unit 220 displays an image. The display unit 220 may be configured with a liquid crystal display, an organic EL (Electro Luminescence) display, or the like. These displays have a relatively large number of regularly arranged pixels and can display images including any shape based on image data. The display unit 220 may be capable of displaying color images, or may be capable of displaying only grayscale images (and monochrome images), or may be capable of displaying only monochrome images (binary images).

[0049] The operation unit 230 accepts user operations (user inputs). At least a part of the operation unit 230 may be integrated with the display unit 220 to form a touch panel display. At least a part of the operation unit 230 may be configured as one or more physical buttons.

[0050] The control unit 240 includes at least one processor and controls the entire display device 200. The at least one processor may be configured as a single integrated circuit (IC), or may be configured as multiple circuits (integrated circuits and / or discrete circuits, etc.) connected to each other in a communicative manner. The control unit 240 controls the communication unit 210, the display unit 220, and the memory unit 250 by executing a program stored in the memory unit 250. For example, the control unit 240 controls the display unit 220 so that the communication unit 210 displays power data received from the power management device 300.

[0051] In the first embodiment, the "control unit" that controls the display of power data may be constituted only by the control unit 330 of the power management device 300, may be constituted only by the control unit 240 of the display device 200, or may be constituted by both the control unit 330 and the control unit 240.

[0052] The storage unit 250 includes various memories such as a ROM, a RAM, an auxiliary storage device, etc. The programs executed by the control unit 240 are stored in the ROM and / or the auxiliary storage device of the storage unit 250, for example.

[0053] (1.4) Operation of the power management system Next, the operation of the power management system 1 according to the first embodiment will be described.

[0054] (1.4.1) Operational flow FIG. 4 is a diagram showing an operation flow of the power management system 1 according to the first embodiment.

[0055] In step S1, the management unit 320 of the power management device 300 manages the self-consignment power amount, which is the amount of power transmitted from the power transmitting side microgrid 100T to the power receiving side microgrid 100R by self-consignment. Here, the management unit 320 manages the self-consignment power amount in a manner that allows identification of whether it is the power transmitting side or the power receiving side.

[0056] In step S2, the control unit 330 of the power management device 300 determines whether the self-consigned power amount to be displayed on the display device 200 is the self-consigned power amount on the power transmitting side or the self-consigned power amount on the power receiving side.

[0057] If it is the self-consigned energy amount of the power transmission side (step S2: YES), in step S3, the control unit 330 of the power management device 300 controls the display device 200 to display the self-consigned energy amount in a first manner. In the first embodiment, the control unit 330 performs display control to cause the display device 200 to display the self-consigned energy amount as "power consumption amount."

[0058] On the other hand, if it is the self-consigned amount of power on the power receiving side (step S2: NO), in step S4, the control unit 330 of the power management device 300 controls the display device 200 to display the self-consigned amount of power in a second manner. In the first embodiment, the control unit 330 performs display control to cause the display device 200 to display the self-consigned amount of power as "amount of generated power."

[0059] (1.4.2) Example of operation FIG. 5 is a diagram showing an example of the operation of the power management system 1 according to the first embodiment.

[0060] 5, it is assumed that X [kWh] of power is transmitted from the power transmitting side microgrid 100T to the power receiving side microgrid 100R in a certain unit time (target unit time). The display device 200 that displays the power data in the power transmitting side microgrid 100T is referred to as the "power transmitting side display device 200T," and the display device 200 that displays the power data in the power receiving side microgrid 100R is referred to as the "power receiving side display device 200R."

[0061] 5, the power management apparatus 300 causes the power transmitting-side display device 200T to display the power data of the power transmitting-side microgrid 100T in a stacked bar graph for the target unit time. The power management apparatus 300 also causes the power receiving-side display device 200R to display the power data of the power receiving-side microgrid 100R in a stacked bar graph for the target unit time.

[0062] The power transmitting side display device 200T displays a bar graph showing the amount of power generated by the distributed power sources 110 of the power transmitting side microgrid 100T and a bar graph showing the amount of power consumed by the power loads 120 of the power transmitting side microgrid 100T side by side. The amount of surplus power obtained by subtracting the amount of power consumed from the amount of power generated is X [kWh], and this surplus power is transmitted by self-dispatching. The power transmitting side display device 200T displays this surplus power (i.e., the amount of self-dispatched power) as the amount of power consumed in the power data of the power transmitting side microgrid 100T. Here, even though this surplus power is not consumed in the power transmitting side microgrid 100T, the power transmitting side display device 200T may display this surplus power as the amount of power consumed by the power transmitting side microgrid 100T. The power transmission side display device 200T may display the power consumption of the power transmission side microgrid 100T in a manner that allows the power consumption of the power load 120 of the power transmission side microgrid 100T to be distinguished from the power consumption corresponding to the self-transferred power amount.

[0063] The power receiving-side display device 200R displays a bar graph indicating the amount of power consumed by the power load 120 of the power receiving-side microgrid 100R and a bar graph indicating the amount of power purchased by the power receiving-side microgrid 100R side by side. The amount of power received from the power grid 10 separately from the purchased power is X [kWh], and this amount of received power is the amount of self-consigned power received by self-consignment. The power receiving-side display device 200R displays the amount of self-consigned power as the amount of generated power in the power data of the power receiving-side microgrid 100R. Here, even though this self-consigned power is not generated by the power receiving-side microgrid 100R, the power receiving-side display device 200R may display the amount of self-consigned power as the amount of generated power of the power receiving-side microgrid 100R. The receiving-side display device 200R may display the amount of power generated by the receiving-side microgrid 100R in a manner that allows the amount of power generated by the distributed power sources 110 of the receiving-side microgrid 100R to be distinguished from the amount of power generated corresponding to the self-transferred power amount.

[0064] The example in FIG. 5 is a display example of power data for a certain unit time, but power data for multiple consecutive unit times may be displayed in chronological order as shown in FIGS. 6 and 7 . FIG. 6 is a diagram showing a display example of power transmission-side power data for a time period in which power is transmitted by self-forwarding in a certain microgrid 100. In the example shown in FIG. 6, the display device 200 displays the power data of the power transmitting-side microgrid 100T for each 30-minute unit time in chronological order. FIG. 7 is a diagram showing a display example of power receiving-side power data for a time period in which power is received by self-forwarding in a certain microgrid 100. In the example shown in FIG. 7, the display device 200 displays the power data of the power receiving-side microgrid 100R for each 30-minute unit time in chronological order. By displaying the amount of self-forwarded power for each unit time in chronological order in this way, the user can understand that self-forwarding is being performed appropriately when surplus power occurs.

[0065] In this operation example, an example has been described in which a stacked bar graph is used as a graph representing power data, but the graph is not limited to a stacked bar graph, and a stacked line graph, stacked area graph, pie chart, or the like may also be used.

[0066] (2) Second embodiment Next, the second embodiment will be described, focusing on the differences from the first embodiment. The configurations of the power management system 1, display device 200, and power management device 300 according to the second embodiment are the same as those of the first embodiment. The second embodiment assumes that the correspondence between the power transmitting side microgrid 100T and the power receiving side microgrid 100R is not one-to-one but one-to-many.

[0067] In the second embodiment, when power is transmitted from one power transmitting microgrid 100T to two or more power receiving microgrids 100R by self-dispatch, the control unit 330 of the power management device 300 causes the display device 200 to display the self-dispatch power amount in a manner that makes it possible to identify the allocation of the self-dispatch power amount to the two or more power receiving microgrids 100R. Here, the "manner in which the allocation of the self-dispatch power amount is possible to be identified" may be a manner in which text (e.g., numerical values) and / or a graph indicating the self-dispatch power amount transmitted by the power transmitting microgrid 100T and text and / or a graph indicating the self-dispatch power amount received by each of the two or more power receiving microgrids 100R are simultaneously displayed. Alternatively, the "manner in which the allocation of the self-dispatch power amount is possible to be identified" may be a manner in which the proportion (allocation) of the self-dispatch power amount received by each of the two or more power receiving microgrids 100R is calculated from the self-dispatch power amount transmitted by the power transmitting microgrid 100T and the calculated proportion is displayed. In the following, we will mainly explain an example in which a bar graph showing the amount of self-transferred power transmitted by the transmitting side microgrid 100T and a stacked bar graph showing the amount of self-transferred power received by each of two or more receiving side microgrids 100R are displayed side by side.

[0068] This allows the user of the power transmitting side microgrid 100T to easily understand the allocation of the consignment destinations that are the power transmission destinations in the self-consignment based on the display contents of the display device 200.

[0069] In addition, in the second embodiment, when power is transmitted from two or more transmitting side microgrids 100T to one receiving side microgrid 100R by self-dispatch, the control unit 330 of the power management device 300 displays the self-dispatched power amount on the display device 200 in a manner that makes it possible to identify the allocation of the self-dispatched power amount from the two or more transmitting side microgrids 100T.

[0070] This allows the user of the power receiving side microgrid 100R to easily understand the allocation of the consignment source, which is the power transmission source in the self-consignment, based on the display content of the display device 200.

[0071] 8 is a diagram showing a first operation example of the power management system 1 according to the second embodiment. Here, it is assumed that one power transmitting side microgrid 100T transmits power to two power receiving side microgrids 100R1 and 100R2 by self-wheeling.

[0072] 8, in a certain unit time (target unit time), the transmitting-side microgrid 100T outputs surplus power X [kWh] in the transmitting-side microgrid 100T to the power system 10 according to the power transmission plan. The management unit 320 of the power management device 300 manages the transmitting-side power data indicating X [kWh] as the self-transmitted power amount of the transmitting-side microgrid 100T in the target unit time.

[0073] During the target unit time, the receiving-side microgrid 100R1 receives A [kWh] of power from the power system 10 in addition to the purchased power. The management unit 320 of the power management device 300 manages the receiving-side power data indicating A [kWh] as the self-consignment power amount of the receiving-side microgrid 100R1 during the target unit time. Here, the management unit 320 of the power management device 300 manages the receiving-side power data indicating A [kWh] in association with the transmitting-side power data indicating X [kWh].

[0074] During the target unit time, the power receiving microgrid 100R2 receives B [kWh] of power from the power system 10 in addition to the purchased power. The management unit 320 of the power management device 300 manages the power receiving power data indicating B [kWh] as the self-consignment power amount of the power receiving microgrid 100R2 during the target unit time. Here, the management unit 320 of the power management device 300 manages the power receiving power data indicating B [kWh] in association with the power transmitting power data indicating X [kWh].

[0075] The control unit 330 of the power management device 300 then causes the power transmitting-side display device 200T to display the self-consigned amount of power in a manner that enables identification of the distribution of the self-consigned amount of power from the power transmitting-side microgrid 100T to the two power receiving-side microgrids 100R1 and 100R2. For example, the power transmitting-side display device 200T displays a bar graph showing the self-consigned amount of power (X [kWh]) of the power transmitting-side microgrid 100T and a bar graph stacking the self-consigned amount of power (A [kWh] and B [kWh]) of each of the two power receiving-side microgrids 100R1 and 100R2 side by side. That is, the power transmitting-side display device 200T displays a graph indicating that, of the self-consigned amount of power X [kWh] of the power transmitting-side microgrid 100T, A [kWh] has been transmitted to the power receiving-side microgrid 100R1 and B [kWh] has been transmitted to the power receiving-side microgrid 100R2. Here, the control unit 330 of the power management apparatus 300 may display the identifier of the power receiving side microgrid 100R1 in association with A [kWh], and the identifier of the power receiving side microgrid 100R2 in association with B [kWh].

[0076] Such display control allows the user of the power transmitting side microgrid 100T to easily understand the allocation of the self-consignment power amount to the two power receiving side microgrids 100R1 and 100R2 based on the display contents of the power transmitting side display device 200T.

[0077] 9 is a diagram showing a second operation example of the power management system 1 according to the second embodiment. Here, it is assumed that power is transmitted from two power transmitting side microgrids 100T1 and 100T2 to one power receiving side microgrid 100R by self-wheeling.

[0078] 9, in a certain unit time (target unit time), the transmitting-side microgrid 100T1 outputs surplus power C [kWh] in the transmitting-side microgrid 100T1 to the power system 10 according to the power transmission plan. The management unit 320 of the power management device 300 manages the transmitting-side power data indicating C [kWh] as the self-transmitted power amount of the transmitting-side microgrid 100T1 in the target unit time.

[0079] In the target unit time, the transmitting-side microgrid 100T2 outputs surplus power D [kWh] in the transmitting-side microgrid 100T2 to the power system 10 according to the power transmission plan. The management unit 320 of the power management device 300 manages the transmitting-side power data indicating D [kWh] as the self-transmitted power amount of the transmitting-side microgrid 100T2 in the target unit time.

[0080] During the target unit time, the receiving-side microgrid 100R receives Y [kWh] of power from the power system 10 in addition to the purchased power. The management unit 320 of the power management device 300 manages the receiving-side power data indicating Y [kWh] as the self-consignment power amount of the receiving-side microgrid 100R during the target unit time. Here, the management unit 320 of the power management device 300 manages the receiving-side power data indicating Y [kWh] in association with the transmitting-side power data indicating C [kWh] and the transmitting-side power data indicating D [kWh].

[0081] The control unit 330 of the power management apparatus 300 then causes the power receiving-side display device 200R to display the self-consigned amount of power in a manner that allows the allocation of the self-consigned amount of power from the two power transmitting-side microgrids 100T1 and 100T2 to be identified. For example, the power receiving-side display device 200R displays a bar graph showing the self-consigned amount of power (Y [kWh]) of the power receiving-side microgrid 100R and a bar graph stacking the self-consigned amount of power (C [kWh] and D [kWh]) of the two power transmitting-side microgrids 100T1 and 100T2 side by side. That is, the power receiving-side display device 200R displays a graph indicating that, of the self-consigned amount of power Y [kWh] of the power receiving-side microgrid 100R, C [kWh] has been transmitted from the power transmitting-side microgrid 100T1 and D [kWh] has been transmitted from the power transmitting-side microgrid 100T2. Here, the control unit 330 of the power management apparatus 300 may display the identifier of the power transmitting side microgrid 100T1 in association with C [kWh], and the identifier of the power transmitting side microgrid 100T2 in association with D [kWh].

[0082] Such display control allows the user of the power receiving side microgrid 100R to easily understand the allocation of the self-consignment power amount from the two power transmitting side microgrids 100T1 and 100T2 based on the display contents of the power receiving side display device 200R.

[0083] The examples of FIGS. 8 and 9 are examples of displaying power data for a certain unit time, but as shown in FIGS. 10 and 11, power data for a plurality of temporally consecutive unit times may be displayed in chronological order.

[0084] FIG. 10 is a diagram showing an example of displaying power data on the power transmitting side during a time period when a certain microgrid 100 (local microgrid) transmits power to two power receiving microgrids 100R (other grids 1 and 2) by self-dispatch. In the example shown in FIG. 10, the display device 200 displays the power data of the power transmitting microgrid 100T in chronological order for each unit time of 30 minutes. Here, as in the first embodiment, an example is shown in which the amount of self-dispatched power on the power transmitting side is displayed as "power consumption amount." Specifically, the amount of self-dispatched power on the power transmitting side is displayed separately as "power consumption amount of other grid 1" and "power consumption amount of other grid 2."

[0085] FIG. 11 is a diagram showing an example of displaying receiving-side power data during a time period when a certain microgrid 100 (local microgrid) receives power from two transmitting-side microgrids 100T (other grids 1 and 2) by self-consignment. In the example shown in FIG. 11, the display device 200 displays the power data of the receiving-side microgrid 100R in chronological order for each unit time of 30 minutes. Here, as in the first embodiment, an example is shown in which the self-consignment amount of power on the receiving side is displayed as "amount of power generated." Specifically, the self-consignment amount of power on the receiving side is displayed separately as "amount of power generated by other grid 1" and "amount of power generated by other grid 2."

[0086] In this operation example, an example has been described in which a stacked bar graph is used as a graph representing power data, but the graph is not limited to a stacked bar graph, and a stacked line graph, stacked area graph, pie chart, or the like may also be used.

[0087] (3) Third embodiment Next, the third embodiment will be described, focusing on the differences from the first and second embodiments. The configurations of the power management system 1, the display device 200, and the power management device 300 according to the third embodiment are the same as those of the first embodiment.

[0088] In the third embodiment, it is assumed that one microgrid 100 can be both the power transmitting side and the power receiving side in self-dispatch. For example, as shown in Fig. 12, among multiple microgrids with different surplus power generation timings, the relationship between the power transmitting side and the power receiving side in self-dispatch may be reversed depending on the time period. In the example of Fig. 12, the microgrid 100a has a baseload power source (e.g., a hydroelectric power generation facility or a geothermal power generation facility) as the distributed power source 110a, and the microgrid 100b has a variable environment power source (e.g., a solar cell facility) as the distributed power source 110b.

[0089] In the microgrid 100a, surplus power is generated during a first time period (here, "nighttime") when the amount of power consumed by the power load 120a is low, while in the microgrid 100b, the amount of power generated by the distributed power source 110b is low during the nighttime, resulting in a power shortage. Therefore, during the nighttime, power is transmitted from the microgrid 100a to the microgrid 100b by self-wheeling. In this case, the microgrid 100a becomes the transmitting-side microgrid 100T, and the microgrid 100b becomes the receiving-side microgrid 100R.

[0090] In the microgrid 100b, surplus power is generated during a second time slot (here, "daytime") when the amount of power generated by the distributed power source 110b is large, while in the microgrid 100a, the amount of power consumed by the power load 120a during the daytime is large, resulting in a power shortage. Therefore, during the daytime, power is transmitted from the microgrid 100b to the microgrid 100a by self-wheeling. In this case, the microgrid 100a becomes the power-receiving microgrid 100R, and the microgrid 100b becomes the power-transmitting microgrid 100T.

[0091] Under such an assumption, the control unit 330 of the power management device 300 performs a power transmission enable / disable setting for each of the multiple microgrids 100, ie, whether or not it is possible for the microgrid 100 to operate as a power transmitting side microgrid 100T, and a power receiving enable / disable setting for whether or not it is possible for the microgrid 100 to operate as a power receiving side microgrid 100R. This allows appropriate management of self-dispatch under the assumption that each microgrid 100 can be both the power transmitting side and the power receiving side in self-dispatch. Alternatively, only the power transmission enable / disable setting may be performed, or only the power receiving enable / disable setting may be performed.

[0092] The control unit 330 of the power management apparatus 300 may set the power transmission availability and the power reception availability for each time period for each of the multiple microgrids 100. The time period may have a time length that is an integral multiple of a unit time (e.g., 30 minutes).

[0093] The control unit 330 of the power management device 300 controls the display device 200 (power transmission side display device 200T) to display power transmission side power data for a microgrid 100 that has been set as a power transmission side microgrid 100T by the power transmission enable / disable setting. Here, the control unit 330 of the power management device 300 may perform display control to display the self-consigned power amount of the microgrid 100 (power transmission side microgrid 100T) as the "power consumption amount," as in the first embodiment. When power is transmitted from the microgrid 100 (power transmission side microgrid 100T) to two or more power receiving side microgrids 100R by self-consignment, the control unit 330 of the power management device 300 may perform display control to display the self-consigned power amount in a manner that makes it possible to identify the allocation of the self-consigned power amount to the two or more power receiving side microgrids 100R, as in the second embodiment. On the other hand, the control unit 330 of the power management device 300 controls the display device 200 not to display the power transmission side power data for the microgrid 100 that is not set as the power transmission side microgrid 100T by the power transmission permission setting.

[0094] Furthermore, for a microgrid 100 that has been set as the power receiving microgrid 100R by the power reception enable / disable setting, the control unit 330 of the power management device 300 controls the display device 200 (power receiving-side display device 200R) to display power receiving-side power data. Here, the control unit 330 of the power management device 300 may perform display control to display the self-consigned power amount of the microgrid 100 (power receiving-side microgrid 100R) as the "amount of generated power," as in the first embodiment. When the microgrid 100 (power receiving-side microgrid 100R) receives power from two or more power transmitting-side microgrids 100T by self-consignment, the control unit 330 of the power management device 300 may perform display control to display the self-consigned power amount in a manner that makes it possible to identify the allocation of the self-consigned power amount from the two or more power transmitting-side microgrids 100T, as in the second embodiment. On the other hand, the control unit 330 of the power management apparatus 300 controls the display device 200 not to display the power receiving side power data for the microgrid 100 that is not set as the power receiving side microgrid 100R by the power receiving permission setting.

[0095] 13 is a diagram showing an example of the operation of the power management system 1 according to the third embodiment. Here, an example is shown in which the power management device 300 manages self-dispatch in a self-dispatch group consisting of three microgrids 100.

[0096] The management unit 320 of the power management apparatus 300 manages a self-dispatch group setting including a power transmission permission setting and a power reception permission setting for each of the microgrids 100a to 100c. The control unit 330 of the power management apparatus 300 sets a power transmission permission setting and a power reception permission setting for each of the microgrids 100a to 100c based on the self-dispatch group setting.

[0097] 13, the microgrid 100a is set to enable both power transmission and power reception (ON) in self-consignment. The control unit 330 of the power management device 300 controls the display device 200a to display both the power transmission-side power data and the power receiving-side power data for the microgrid 100a.

[0098] The microgrid 100b is set to enable power transmission (ON) in self-consignment and disable power reception (OFF) in self-consignment. The control unit 330 of the power management device 300 controls the display device 200b to display only the power transmission side power data for the microgrid 100b.

[0099] The microgrid 100c is set to disable (OFF) power transmission in self-consignment and set to enable (ON) power reception in self-consignment. The control unit 330 of the power management device 300 controls the display device 200c to display only the power receiving side power data for the microgrid 100b.

[0100] As described above, according to the third embodiment, it is possible to set the power transmission and power reception in self-consignment for each microgrid 100, and therefore it is possible to appropriately display only the power data required for each microgrid 100.

[0101] (4) Fourth embodiment Next, the fourth embodiment will be described, focusing on the differences from the first to third embodiments. The configurations of the power management system 1, the display device 200, and the power management device 300 according to the fourth embodiment are the same as those of the first embodiment.

[0102] As described above, when one transmitting side microgrid 100T can transmit power to two or more receiving side microgrids 100R through self-dispatching, the question arises as to how to determine the allocation of the self-dispatched power amount to the two or more receiving side microgrids 100R.

[0103] In the fourth embodiment, the control unit 330 of the power management device 300 sets a power transmission priority for when power is transmitted from one microgrid 100 to another microgrid 100 by self-dispatch for each of the other microgrids 100. That is, when transmitting power to two or more power receiving-side microgrids 100R by self-dispatch, a priority is set in the dispatch setting for each power receiving-side microgrid 100R.

[0104] This makes it possible to plan self-wheeling that is most economically advantageous for the entity (microgrid manager) to which each microgrid 100 belongs.

[0105] The control unit 330 of the power management apparatus 300 may set the power transmission priority for each of the two or more power receiving-side microgrids 100R for each time period. The time period may have a time length that is an integral multiple of a unit time (e.g., 30 minutes).

[0106] 14 is a diagram showing an example of the operation of the power management system 1 according to the fourth embodiment. Here, it is assumed that power can be transmitted from the power transmitting side microgrid 100T to two power receiving side microgrids 100R1 and 100R2 by self-wheeling.

[0107] First, the management unit 320 of the power management apparatus 300 manages the power transmission priority for each of the power receiving microgrids 100R1 and 100R2 when transmitting power from the power transmitting microgrid 100T to the power receiving microgrids 100R1 and 100R2 by self-consignment. In the example of Fig. 14, the power receiving microgrid 100R1 is managed as having a "high" power transmission priority, and the power receiving microgrid 100R1 is managed as having a "low" power transmission priority. Such power transmission priorities may be determined by a microgrid manager.

[0108] Second, the control unit 330 of the power management apparatus 300 sets the power transmission priority for each of the power receiving microgrids 100R1 and 100R2 when transmitting power from the power transmitting microgrid 100T to the power receiving microgrids 100R1 and 100R2 through self-dispatch. For example, the control unit 330 of the power management apparatus 300 sets the power receiving microgrid 100R1 to have a "high" power transmission priority and the power receiving microgrid 100R1 to have a "low" power transmission priority. In this case, the power receiving microgrid 100R1 may receive more power than the power receiving microgrid 100R2 when receiving power from the power transmitting microgrid 100T through self-dispatch. Alternatively, the power receiving microgrid 100R2 may not receive power from the power transmitting microgrid 100T by self-wheeling, but only the power receiving microgrid 100R2 may receive power from the power transmitting microgrid 100T by self-wheeling.

[0109] (4.1) Modification of the Fourth Embodiment Next, a modified example of the fourth embodiment will be described, focusing on differences from the fourth embodiment. In the fourth embodiment, it is assumed that the power transmission priority is set in a fixed manner in advance, but in this modified example, the power transmission priority can be set more flexibly.

[0110] In this modified example, the control unit 330 of the power management apparatus 300 determines the power transmission priority for each of the other microgrids 100 when transmitting power from one microgrid 100 to the other microgrids 100 by self-dispatch. Specifically, the control unit 330 of the power management apparatus 300 determines the power transmission priority using a determination method selected from a plurality of determination methods having different determination criteria for determining the power transmission priority. As a result, when transmitting power to multiple power receiving microgrids 100R by self-dispatch, it is possible to determine the priority of each power receiving microgrid 100R even if the priority is not set in the dispatch setting for each power receiving microgrid 100R. Note that the control unit 330 of the power management apparatus 300 may switch the determination method for determining the power transmission priority for each time period. The time period may have a length that is an integer multiple of a unit time (e.g., 30 minutes).

[0111] Here, the following determination methods a to d are examples of the multiple determination methods using different criteria for determining the power transmission priority.

[0112] "Determination method a" is a method in which, if there is a microgrid among the candidate receiving-side microgrids that can cut peak power by wheeling power, priority is given to transmitting power to that microgrid. "Determination method a" may also be a determination method in which priority is given to the microgrid 100 that can cut peak power by self-wheeling power at least during the time period in which self-wheeling is performed.

[0113] "Determination method b" is a method in which, if there is a microgrid that has a chargeable energy storage facility among the candidate receiving-side microgrids, priority is given to transmitting power to that microgrid. Here, charging is planned for the energy storage facility in the receiving-side microgrid at the relevant time. "Determination method b" may also be a determination method in which priority is given to a microgrid 100 that has a storage battery that can be charged with self-dispatched power at least during the time period in which self-dispatched power is performed.

[0114] "Determination method c" is a method of prioritizing the transmission of power to a microgrid 100 whose supply-demand plan value reliability is low (i.e., whose prediction confidence interval is wide) among the candidate power-receiving microgrids. "Determination method c" can reduce shortage imbalance in the power-receiving microgrid. "Determination method c" may be a determination method of prioritizing a microgrid 100 whose value indicating the reliability of the supply-demand plan value at least during the time period in which self-dispatching is performed is less than a predetermined value.

[0115] "Determination method d" is a method of grasping the electricity rate plans of candidate receiving microgrids and giving priority to transmitting power to the microgrid with the highest electricity unit price during the wheeling time period. "Determination method d" may also be a determination method of giving priority to the microgrid 100 with the highest electricity unit price (purchased power) from the power system 10 at least during the time period in which self-wheeling is performed.

[0116] 15 is a diagram illustrating an example of the operation of the power management system 1 according to the modified example of the fourth embodiment. Here, it is assumed that power can be transmitted from the power transmitting side microgrid 100T to two power receiving side microgrids 100R1 and 100R2 by self-wheeling.

[0117] First, the management unit 320 of the power management apparatus 300 manages the determination methods for determining the power transmission priority when transmitting power from the power transmitting side microgrid 100T to the power receiving side microgrids 100R1 and 100R2 by self-dispatching, in association with the determination order. In the example of Fig. 15, the determination method used first is "Determination Method 1," and the determination method used second is "Determination Method 2." The determination methods may be set by the microgrid administrator.

[0118] Second, the control unit 330 of the power management apparatus 300 first determines the power transmission priorities for the power receiving microgrids 100R1 and 100R2 using "Determination Method 1." If the power transmission priorities cannot be determined using "Determination Method 1," the control unit 330 of the power management apparatus 300 then determines the power transmission priorities for the power receiving microgrids 100R1 and 100R2 using "Determination Method 2." Once the power transmission priorities have been determined in this manner, the control unit 330 of the power management apparatus 300 sets the determined power transmission priorities for each of the power receiving microgrids 100R1 and 100R2.

[0119] (5) Other embodiments In the above-described fourth embodiment and its modifications, an example has been described in which priorities are set for multiple power receiving microgrids 100R in a case where the power receiving microgrid 100R requires power. However, the power management device 300 may set one of the multiple power transmitting microgrids 100T to transmit power preferentially over the other power transmitting microgrids 100T. For example, assuming that one power transmitting microgrid 100T and another power transmitting microgrid 100T exist, the power management device 300 may set one of the power transmitting microgrids 100T to transmit power preferentially based on the type of power generation equipment included in the power transmitting microgrid 100T.

[0120] In the above-described embodiment, an example has been described in which the display device 200 is located inside the microgrid 100, but the present invention is not limited to such a configuration. As shown in FIG. 16 , the display device 200 may be located outside the microgrid 100 as long as it is accessible to the power management device 300. When the display device 200 authenticates (logs in to) the power management device 300, the power management device 300 may determine which microgrid 100's power data should be displayed on the display device 200. For example, the power management device 300 may store a correspondence between authentication information and microgrids 100, identify the corresponding microgrid 100 based on the authentication information received from the display device 200, and display the power data of the identified microgrid 100 on the display device 200.

[0121] A program may be provided that causes a computer to execute the operations according to the above-described embodiments. The program may be recorded on a computer-readable medium. The computer-readable medium can be used to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM. Furthermore, circuits that execute the operations according to the above-described embodiments may be integrated to form a semiconductor integrated circuit (chip set, SoC).

[0122] As used in this disclosure, the terms "include," "comprise," and variations thereof do not mean including only the listed items, but may include only the listed items, or may include additional items in addition to the listed items. Furthermore, as used in this disclosure, the term "or" is not intended to mean an exclusive or. As used in this disclosure, the terms "based on" and "dependent on" do not mean "based only on" or "dependent only on," unless expressly stated otherwise. The term "based on" means both "based only on" and "based at least in part on." Similarly, the term "dependent on" means both "based only on" and "based at least in part on." Furthermore, any reference to elements using designations such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein, or that the first element must precede the second element in some way. In this disclosure, where articles are added by translation, such as a, an, and the in English, these articles are intended to include the plural unless the context clearly indicates otherwise.

[0123] The above describes the embodiments in detail with reference to the drawings, but the specific configuration is not limited to that described above, and various design changes can be made within the scope that does not deviate from the gist of the invention. [Explanation of symbols]

[0124] 1: Power management system 10: Power system 20: Communication Network 100: Microgrid 100T: Power transmission side microgrid 100R: Receiving microgrid 101: Power lines 102: Power receiving point 110: Distributed power supply 120: Power load 200:Display device 200T: Power transmission side display device 200R: Power receiving side display device 201: Bus 210: Communications Department 220: Display section 230:Operation unit 240: Control unit 250: Storage section 300: Power management device 301: Bus 310: Communications Department 311: Storage section 320: Management Department 321: Storage section 330: Control unit

Claims

1. A power management system that manages power transmission by self-consignment between multiple grids via a power system, a management unit that manages a self-consignment power amount, which is the amount of power transmitted from the power transmitting side grid to the power receiving side grid by the self-consignment; A control unit that displays the self-transmitted power amount on a display device, When the control unit causes the display device to display the self-consigned power amount for the power transmission side grid, the control unit causes the display device to display the self-consigned power amount as the power consumption amount of the power transmission side grid. Power management system.

2. A power management system that manages power transmission by self-consignment between multiple grids via a power system, a management unit that manages a self-consignment power amount, which is the amount of power transmitted from the power transmitting side grid to the power receiving side grid by the self-consignment; A control unit that displays the self-transmitted power amount on a display device, When the control unit causes the display device to display the self-consigned power amount for the power receiving grid, the control unit causes the display device to display the self-consigned power amount as the amount of power generated by the power receiving grid. Power management system.

3. When the amount of surplus power in the power transmission-side grid is transmitted to the power receiving-side grid by the self-consignment, the control unit causes the display device to display the amount of surplus power as the amount of power consumption. The power management system of claim 1 .

4. The control unit performs a power transmission setting for each of the plurality of grids, which determines whether the grid is capable of operating as the power transmitting grid, and a power reception setting for each of the plurality of grids, which determines whether the grid is capable of operating as the power receiving grid. The power management system according to any one of claims 1 to 3.

5. The control unit sets a power transmission priority for each of the other grids when transmitting power from one grid to another grid by the self-consignment. The power management system according to any one of claims 1 to 4.

6. The control unit determines, for each of the other grids, a power transmission priority when transmitting power from one grid to another grid by the self-consignment, using a determination method selected from a plurality of determination methods having different determination criteria for determining the power transmission priority. The power management system according to any one of claims 1 to 5.

7. A display device used in a power management system that manages power transmission by self-consignment between multiple grids via a power system, a display unit that displays a self-consignment power amount, which is the amount of power transmitted from the power transmitting side grid to the power receiving side grid by the self-consignment; When displaying the self-consigned power amount for the power transmission side grid, the display unit displays the self-consigned power amount as a power consumption amount of the power transmission side grid. Display device.

8. A display device used in a power management system that manages power transmission by self-consignment between multiple grids via a power system, a display unit that displays a self-consignment power amount, which is the amount of power transmitted from the power transmitting side grid to the power receiving side grid by the self-consignment; When displaying the self-consigned power amount for the power receiving side grid, the display unit displays the self-consigned power amount as the amount of power generated by the power receiving side grid. Display device.

9. A power management method used in a power management system that manages power transmission by self-consignment between multiple grids via a power system, a step of displaying a self-consignment power amount, which is the amount of power transmitted from the power transmitting side grid to the power receiving side grid by the self-consignment; The displaying step includes, when displaying the self-consigned power amount for the power transmission side grid, displaying the self-consigned power amount as the power consumption amount of the power transmission side grid. Power management methods.

10. A power management method used in a power management system that manages power transmission by self-consignment between multiple grids via a power system, a step of displaying a self-consignment power amount, which is the amount of power transmitted from the power transmitting side grid to the power receiving side grid by the self-consignment; The displaying step includes, when displaying the self-consigned power amount for the power receiving side grid, displaying the self-consigned power amount as the amount of power generated by the power receiving side grid. Power management methods.

11. A display device used in a power management system that manages power transmission by self-consignment between multiple grids via a power system, a step of displaying a self-consignment power amount, which is the amount of power transmitted from the power transmission side grid to the power receiving side grid by the self-consignment; When the self-consigned power amount is displayed for the power transmission side grid, the displaying step includes a step of displaying the self-consigned power amount on the display device as the power consumption amount of the power transmission side grid. program.

12. A display device used in a power management system that manages power transmission by self-consignment between multiple grids via a power system, a step of displaying a self-consignment power amount, which is the amount of power transmitted from the power transmission side grid to the power receiving side grid by the self-consignment; When the self-consigned power amount is displayed for the power receiving side grid, the displaying step includes a step of displaying the self-consigned power amount on the display device as the amount of power generated by the power receiving side grid. program.

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