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 Art】 【0002】 Conventionally, self-delivery in which power is transmitted from a distributed power source to a power demand facility (from another perspective, a power load) belonging to the same entity as the distributed power source through a power grid managed by a power transmission and distribution company or the like is known (see, for example, Patent Document 1). 【0003】 Also, a microgrid that is connected to a power grid and has a distributed power source and a power load that consumes the output power of the distributed power source is known (see, for example, Patent Document 2). 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2021-87278 【Patent Document 2】 Japanese Patent Application Laid-Open No. 2022-13180 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 In order for a user to grasp data related to power, "visualization of power" is important, and it is preferable to display on a display device a graph showing the amount of power generated by a distributed power source and a graph showing the amount of power consumed by a power load. However, when performing self-delivery between grids such as a microgrid, there is a problem that the display method of the amount of self-delivery power may not be uniquely determined because the way of grasping the amount of self-delivery power may differ between the power transmission side and the power reception side. 【0006】 The present invention aims to provide a power management system, a display device, a power management method, and a program capable of appropriately displaying the amount of self-transmissioned power between grids. [Means for solving the problem] 【0007】 The power management system according to the first embodiment is a system for managing power transmission performed by self-consignment between multiple grids via a power system. The power management system comprises a management unit for managing the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment, and a control unit for displaying the amount of self-consigned power on a display device. When the control unit displays the amount of self-consigned power for the transmitting grid, it considers the amount of self-consigned power as the amount of power consumed by the transmitting grid and displays it on the display device. 【0008】 The power management system according to the second embodiment is a system for managing power transmission performed by self-consignment between multiple grids via a power system. The power management system comprises a management unit for managing the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment, and a control unit for displaying the amount of self-consigned power on a display device. When the control unit displays the amount of self-consigned power for the receiving grid, it considers the amount of self-consigned power as the amount of power generated by the receiving grid and displays it on the display device. 【0009】 The third embodiment of the display device is a device used in a power management system that manages power transmission performed by self-consignment between multiple grids via a power system. The display device includes a display unit that displays the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment. When the display unit displays the amount of self-consigned power for the transmitting grid, it displays the amount of self-consigned power as the power consumption of the transmitting grid. 【0010】 The display device according to the fourth embodiment is a device used in a power management system that manages power transmission performed by self-consignment between multiple grids via a power system. The display device includes a display unit that displays the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment. When the display unit displays the amount of self-consigned power for the receiving grid, it displays the amount of self-consigned power as the amount of power generated by the receiving grid. 【0011】 A power management method according to a fifth aspect is a method used in a power management system for managing power transmission performed by self-consignment between multiple grids via a power system. The power management method includes a step of displaying the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment. When displaying the amount of self-consigned power for the transmitting grid, the display step includes a step of displaying the amount of self-consigned power as the amount of power consumed by the transmitting grid. 【0012】 The sixth aspect of the power management method is a method used in a power management system for managing power transmission performed by self-consignment between multiple grids via a power system. The power management method includes a step of displaying the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment. When displaying the amount of self-consigned power for the receiving grid, the display step includes a step of displaying the amount of self-consigned power as the amount of power generated by the receiving grid. 【0013】 The program according to the seventh aspect causes a display device used in a power management system that manages power transmission by self-consignment between multiple grids via a power system to execute the step of displaying the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment. When the step of displaying the amount of self-consigned power is to be displayed for the transmitting grid, the step of treating the amount of self-consigned power as the amount of power consumed by the transmitting grid and displaying it on the display device is included. 【0014】 The program according to the eighth aspect causes a display device used in a power management system that manages power transmission by self-consignment between multiple grids via a power system to execute a step of displaying the amount of self-consigned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by self-consignment. When the step of displaying the amount of self-consigned power for the receiving grid, the step of treating the amount of self-consigned power as the amount of power generated by the receiving grid and displaying it on the display device is included. [Effects of the Invention] 【0015】 According to one aspect of the present invention, a power management system, a display device, a power management method, and a program capable of appropriately displaying the amount of self-transmissioned power between grids can be provided. [Brief explanation of the drawing] 【0016】 [Figure 1] This figure shows an example of the overall configuration of the power management system according to the embodiment. [Figure 2] This figure shows an example configuration of a power management device according to an embodiment. [Figure 3] This figure shows an example configuration of a display device according to the embodiment. [Figure 4] This diagram shows the operation flow of the power management system according to the embodiment. [Figure 5] This figure shows an example of the operation of a power management system according to the first embodiment. [Figure 6] This figure shows an example of displaying power transmission data on the transmission side during the time period when power is transmitted by self-consignment. [Figure 7] This figure shows an example of displaying power data on the receiving side during the time period when power is received via self-transmission. [Figure 8] This figure shows a first example of operation of the power management system according to the second embodiment. [Figure 9] This figure shows a second example of operation of the power management system according to the second embodiment. [Figure 10]FIG. 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 reception side microgrids (other grids 1 and 2) by self-delivery. [Figure 11] FIG. is a diagram showing an example of display of power reception side power data in a time period when power is received from two power transmission side microgrids (other grids 1 and 2) by self-delivery. [Figure 12] FIG. is a diagram for explaining the third embodiment. [Figure 13] FIG. is a diagram showing an operation example of the power management system according to the third embodiment. [Figure 14] FIG. is a diagram showing an operation example of the power management system according to the fourth embodiment. [Figure 15] FIG. is a diagram showing an operation example of the power management system according to a modification example of the fourth embodiment. [Figure 16] FIG. is a diagram showing a modification example of the configuration of the power management system. 【MODE FOR CARRYING OUT THE INVENTION】 【0017】 The power management system according to the embodiment will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. In the description of the embodiment, it is assumed that the "grid" is a "microgrid", but the "grid" is not limited to the "microgrid" and may be, for example, a "large-scale grid". 【0018】 (1) First Embodiment (1.1) Configuration of Power Management System First, the configuration of the power management system according to the first embodiment will be described. FIG. 1 is a diagram showing an overall configuration example of the power management system 1 according to the first embodiment. 【0019】 The power management system 1 shown in Figure 1 comprises a plurality of microgrids 100 (100a, 100b, 100c, etc.) connected to a power grid 10, a plurality of display devices 200 (200a, 200b, 200c, etc.), and a power management device 300. Although Figure 1 illustrates three microgrids 100 (100a, 100b, 100c), the number of microgrids 100 may be two or more. Each microgrid 100 and power management device 300 are connected to each other via a communication network 20 so as to be able to communicate with each other. The communication network 20 includes at least one of a LAN (Local Area Network), a WAN (Wide Area Network), and the Internet. 【0020】 Each microgrid 100 is located in a geographically separate location from other microgrids 100. That is, multiple microgrids 100 are 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, "same entity" is not limited to cases where the entities to which each microgrid 100 belongs are exactly the same (for example, each microgrid 100 belongs to the same business operator or the same local government, etc.). For example, cases where the entity to which one microgrid 100 belongs and the entity to which another microgrid 100 belongs have a close relationship to the extent that they can be considered the same entity (for example, a company and its group companies) are also included in "same entity". 【0022】 Each microgrid 100 is connected to the power grid 10. The power grid 10 is managed by an entity different from the entity to which each microgrid 100 belongs. The entity managing the power grid 10 may be a power company, power generator, transmission and distribution company, or electricity retailer that manages the power grid 10. 【0023】 In the first embodiment, each microgrid 100 has at least one distributed power source 110 and at least one power load 120. In the example in Figure 1, an example is shown in which each microgrid 100 has both a distributed power source 110 and a power load 120, but any microgrid 100 may have only one of the distributed power source 110 or the power load 120. The distributed power source 110 includes power generation equipment such as a photovoltaic power generation facility and / or a fuel cell facility. The power generation equipment may also 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 battery storage facility. The power load 120 is a device that consumes (uses) electricity. 【0024】 Here, we assume that each microgrid 100 is configured similarly, and we will use microgrid 100a as an example. Microgrid 100a has distributed power sources 110a and power loads 120a connected to power line 101a. Power line 101a may be a power line managed by the entity to which microgrid 100a belongs (e.g., a private line), or it may be part of the power system 10. Power line 101a is connected to the power system 10 at the point of power reception 102a. Power load 120a consumes power supplied via power line 101a, specifically power supplied from distributed power sources 110a and / or power supplied from the power system 10. Similarly, microgrid 100b has distributed power sources 110b and power loads 120b connected to power line 101b (and point of power reception 102b). The microgrid 100c has distributed power sources 110c and power loads 120c connected to power lines 101c (and power receiving point 102c). 【0025】 In the power management system 1 shown in Figure 1, each microgrid 100 has a display device 200 that displays power data related to its own microgrid 100. For example, microgrid 100a has a display device 200a that displays power data related to microgrid 100a. Similarly, microgrid 100b has a display device 200b that displays power data related to microgrid 100b. Microgrid 100c has a display device 200c that displays power data related to 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 a mobile device such as a smartphone, tablet, laptop computer (PC), or wearable device. The display device 200 may also be a stationary device 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 self-transmission through the power grid 10. This makes it possible, for example, for one microgrid 100 to efficiently consume surplus power, which is the amount of power output (generated) by the distributed power source 110 minus the power consumed by the power load 120, in another microgrid 100. Furthermore, by self-transmission from power generation facilities located at different locations, it is possible to increase self-consumption across multiple locations. In addition, by being able to share generated power between locations, the proportion of renewable energy can be increased, contributing to the reduction of carbon dioxide emissions for the company and / or the entire group. 【0028】 However, self-consignment involves using a power system 10 managed by an entity different from the entity to which each microgrid 100 belongs, such as a power company or a transmission and distribution operator, for power transmission. Therefore, when using self-consignment, the requirement of "simultaneous and equal planned values" may be imposed. For example, if a difference (so-called "imbalance") exceeding a threshold 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-consignment), the entity to which the microgrid 100 belongs may be penalized. The unit time may be, for example, 30 minutes. The imbalance to which a penalty is imposed may include transmission imbalance on the transmission side (i.e., the difference between the planned transmission value and the actual transmission value) and reception imbalance on the reception side (i.e., the difference between the planned reception value and the actual reception value). 【0029】 The power management device 300 is a device that manages power data for each microgrid 100. The power management device 300 may manage power data by collecting measurement data from smart meters and / or sensors installed in each microgrid 100. The sensors may be sensors installed in the distributed power sources 110 and / or power loads 120. For example, the power management device 300 manages 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 system 10 (power flow), and the amount of power transmitted by the power system itself (hereinafter referred to as "self-transmitted power"). Here, "power" is not limited to the cumulative power (kWh) over a certain period (e.g., 30 minutes), but may also be instantaneous power (kW). In the following, we will mainly assume that "power" is the cumulative power (kWh). Also, "power" is not limited to measured values, but may also be predicted values. In the following, we will mainly assume that "power" is a measured value. 【0030】 The power management device 300 controls the display for "visualization of 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 microgrid 100a. The power management device 300 causes the display device 200a to display graphs showing the amount of power generated by distributed power sources 110a, graphs showing the amount of power consumed by power loads 120a, and / or graphs 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 microgrid 100b. The power management device 300 controls the display device 200c to display power data related to microgrid 100c. 【0031】 In such display control systems, the way self-transmitted power is perceived can differ between the transmitting and receiving sides, making it difficult to determine a unique method for displaying self-transmitted power. Furthermore, users in each microgrid 100 may lack knowledge of power management, so it is desirable to display self-transmitted power in a way that is easy for users to understand. 【0032】 (1.2) Configuration of the power management device Next, the configuration of the power management device 300 according to the first embodiment will be described. Figure 2 is a diagram showing an example of the configuration of the power management device 300. 【0033】 The power management device 300 shown in Figure 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 sending 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 smart meters and / or sensors installed in each microgrid 100. The communication unit 310 also transmits power data to be displayed on the display device 200. 【0035】 The management unit 320 includes a storage unit 321 for storing data and manages the power data of each microgrid 100. The storage unit 321 may be composed of various types of memory, such as ROM (Read Only Memory), RAM (Random Access Memory), and auxiliary storage devices. The storage unit 321 may also store programs executed by the control unit 330. 【0036】 The management unit 320 manages the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting microgrid to the receiving microgrid through self-transmission, as power data. In the following, the transmitting microgrid will be referred to as "transmitting microgrid 100T" and the receiving microgrid as "receiving microgrid 100R". For example, if the management unit 320 outputs surplus power from the transmitting microgrid 100T to the power system 10 according to the transmission plan, the amount of power output from the transmitting microgrid 100T to the power system 10 may be managed as the transmitting self-transmissioned power. If the receiving microgrid 100R receives power supply from the power system 10 according to the power receiving plan (procurement plan), the management unit 320 may manage this as the receiving self-transmissioned power received by the receiving microgrid 100R from the power system 10. 【0037】 The management unit 320 may further manage the amount of electricity generated by the distributed power sources 110, the amount of electricity consumed by the power loads 120, and / or the amount of electricity purchased from the power system 10 as power data for each microgrid 100. The management unit 320 may also manage self-transmitted power and other power data (amount of electricity generated, amount of electricity consumed, and / or amount of electricity purchased) on a unit time basis. The unit time may be 30 minutes. Here, the management unit 320 manages the amount of self-transmitted power in a manner that allows identification of whether it is the amount of self-transmitted power on the transmitting side or the amount of self-transmitted power on the 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 consist of a single integrated circuit (IC) or a plurality of communicatively connected circuits (integrated circuits and / or discrete circuits, etc.). 【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 that the power data managed by the management unit 320 is displayed on the display device 200. For example, the control unit 330 performs display control to display the amount of self-transmitted power on the display device 200. The control unit 330 makes the display method of the amount of self-transmitted power different when displaying the amount of self-transmitted power for the transmitting microgrid 100T and when displaying the amount of self-transmitted power for the receiving microgrid 100R. "Making the display method of the amount of self-transmitted power different" includes not only the method of differentiating the power type when displaying the amount of self-transmitted power, as described in the first embodiment below, but also the method of differentiating the display of the distribution of the amount of self-transmitted power, as described in the second embodiment below. 【0040】 In this way, by displaying the amount of self-transmitted power for the transmitting microgrid 100T and the amount of self-transmitted power for the receiving microgrid 100R in different ways, it becomes possible to display the amount of self-transmitted power in a manner appropriate to both the transmitting and receiving sides. Therefore, under the premise that the perception of self-transmitted power may differ between the transmitting and receiving sides, it is possible to display it appropriately for both the transmitting and receiving sides. 【0041】 In the first embodiment, when the control unit 330 displays the amount of self-transmitted power for the power transmission side microgrid 100T, it performs display control to display the amount of self-transmitted power as "power consumption" on the display device 200. For example, when the control unit 330 outputs surplus power from the power transmission side microgrid 100T to the power system 10, it controls the display device 200 to display the output power as power consumption. 【0042】 As a result, even if users in the transmission-side microgrid 100T do not have knowledge of self-transmission, they can easily understand the amount of self-transmissioned power on the transmission side as power consumption based on the display information of the display device 200. In addition, users can understand that surplus power in the transmission-side microgrid 100T is being consumed in the receiving-side microgrid 100R, and the benefits of self-transmission can be appealed to users. 【0043】 In the first embodiment, when the control unit 330 displays the amount of self-transmitted power for the receiving microgrid 100R, it performs display control to display the amount of self-transmitted power as "generated power" on the display device 200. For example, when the receiving microgrid 100R receives power from the power system 10 in addition to purchased power, the control unit 330 controls the display device 200 to display the amount of received power as generated power. 【0044】 As a result, even if users in the receiving microgrid 100R do not have knowledge of self-transmission, they can easily understand the amount of self-transmissioned power on the receiving side as the amount of generated power based on the display information of the display device 200. In addition, users can understand that they are consuming surplus power (generated power) in the transmitting microgrid 100T, and the benefits of self-transmission can be appealed to users. 【0045】 (1.3) Display device configuration Next, the configuration of the display device 200 according to the first embodiment will be described. Figure 3 is a diagram showing an example of the configuration of the display device 200. 【0046】 The display device 200 shown in Figure 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, display unit 220, operation unit 230, control unit 240, and 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 and a receiver for receiving. The communication unit 210 communicates with the power management device 300 via the communication network 20. Such communication includes wireless and / or wired communication. For example, the communication unit 210 receives power data from the power management device 300 to be displayed on the display unit 220. 【0048】 The display unit 220 displays an image. The display unit 220 may be composed of a liquid crystal display or an organic EL (Electro-Luminescence) display, etc. These displays have a relatively large number of pixels arranged regularly and can display an image containing any shape based on image data. The display unit 220 may be capable of displaying a color image, or it may be capable of displaying only a grayscale image (and a monochrome image), or it may be capable of displaying only a monochrome image (a binary image). 【0049】 The operation unit 230 accepts user operations (user input). At least a portion of the operation unit 230 may be integrated with the display unit 220 to form a touch panel display. At least a portion 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 consist of a single integrated circuit (IC) or a plurality of communicatively connected circuits (such as integrated circuits and / or discrete circuits). The control unit 240 controls the communication unit 210, the display unit 220, and the storage unit 250 by executing a program stored in the storage unit 250. For example, the control unit 240 controls the display unit 220 to display power data received by the communication unit 210 from the power management device 300. 【0051】 In the first embodiment, the "control unit" that controls the display of power data may consist only of the control unit 330 of the power management device 300, or only of the control unit 240 of the display device 200, or may consist of both the control unit 330 and the control unit 240. 【0052】 The storage unit 250 is configured to include various types of memory, such as ROM, RAM, and auxiliary storage devices. The program executed by the control unit 240 is stored, for example, in the ROM and / or auxiliary storage devices of the storage unit 250. 【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) Operation Flow Figure 4 shows the 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 amount of self-transmissioned power, which is the amount of power transmitted from the transmitting microgrid 100T to the receiving microgrid 100R by self-transmission. Here, the management unit 320 manages the amount of self-transmissioned power in a manner that allows identification of whether it is the transmitting side or the receiving side. 【0056】 In step S2, the control unit 330 of the power management device 300 determines whether the amount of self-transmitted power to be displayed on the display device 200 is the amount of self-transmitted power on the transmitting side or the amount of self-transmitted power on the receiving side. 【0057】 If the amount of power transmitted by the power transmission side is self-transmitted power (step S2: YES), in step S3, the control unit 330 of the power management device 300 controls the display device 200 to display the amount of self-transmitted power in the first manner. In the first embodiment, the control unit 330 performs display control to display the amount of self-transmitted power as "power consumption" on the display device 200. 【0058】 On the other hand, if the amount of power transmitted by the receiving side is self-transmitted power (step S2: NO), in step S4, the control unit 330 of the power management device 300 controls the display device 200 to display the amount of self-transmitted power in the second manner. In the first embodiment, the control unit 330 performs display control to display the amount of self-transmitted power as "power generated" on the display device 200. 【0059】 (1.4.2) Example of operation Figure 5 shows an example of the operation of the power management system 1 according to the first embodiment. 【0060】 In the example shown in Figure 5, it is assumed that X [kWh] of power is transmitted from the transmitting microgrid 100T to the receiving microgrid 100R in a certain unit time (target unit time). The display device 200 that displays power data in the transmitting microgrid 100T is referred to as the "transmitting display device 200T," and the display device 200 that displays power data in the receiving microgrid 100R is referred to as the "receiving display device 200R." 【0061】 In the example shown in Figure 5, the power management device 300 displays the power data of the transmission-side microgrid 100T as a stacked bar graph on the transmission-side display device 200T for the target unit time. The power management device 300 also displays the power data of the receiving-side microgrid 100R as a stacked bar graph on the receiving-side display device 200R for the target unit time. 【0062】 The transmission-side display device 200T displays side-by-side a bar graph showing the amount of electricity generated by the distributed power sources 110 of the transmission-side microgrid 100T and a bar graph showing the amount of electricity consumed by the power load 120 of the transmission-side microgrid 100T. The surplus electricity obtained by subtracting the amount of electricity consumed from the amount of electricity generated is X [kWh], and this surplus electricity is transmitted by self-transmission. In the power data of the transmission-side microgrid 100T, the transmission-side display device 200T displays this surplus electricity (i.e., the amount of self-transmissioned electricity) as the amount of electricity consumed. Here, even if this surplus electricity is not consumed by the transmission-side microgrid 100T, the transmission-side display device 200T may display this surplus electricity as the amount of electricity consumed by the transmission-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 for the identification of the power consumption of the power load 120 of the power transmission-side microgrid 100T and the power consumption corresponding to the amount of self-transmitted power. 【0063】 The receiving-side display device 200R displays side-by-side a bar graph showing the power consumption of the power load 120 of the receiving-side microgrid 100R and a bar graph showing the amount of electricity purchased by the receiving-side microgrid 100R. The amount of electricity received from the power system 10 separately from purchased electricity is X [kWh], and this received electricity is the amount of electricity transmitted by self-transmission. In the power data of the receiving-side microgrid 100R, the receiving-side display device 200R displays the amount of electricity transmitted by self-transmission as the amount of electricity generated. Here, even if the amount of electricity transmitted by self-transmission is not generated by the receiving-side microgrid 100R, the receiving-side display device 200R may display this amount of electricity transmitted by self-transmission as the amount of electricity generated by the receiving-side microgrid 100R. The power receiving side display device 200R may display the amount of power generated by the power receiving side microgrid 100R in a manner that allows for the identification of the amount of power generated by the distributed power sources 110 of the power receiving side microgrid 100R and the amount of power generated corresponding to the amount of power transmitted by the power receiving side microgrid 100R. 【0064】 Figure 5 shows an example of displaying power data for a given unit of time, but as shown in Figures 6 and 7, power data for multiple temporally consecutive unit times may be displayed in chronological order. Figure 6 shows an example of displaying transmission-side power data during a period when a certain microgrid 100 transmits power by self-consignment. In the example shown in Figure 6, the display device 200 displays the power data of the transmission-side microgrid 100T in chronological order for each 30-minute unit of time. Figure 7 shows an example of displaying receiving-side power data during a period when a certain microgrid 100 receives power by self-consignment. In the example shown in Figure 7, the display device 200 displays the power data of the receiving-side microgrid 100R in chronological order for each 30-minute unit of time. By displaying the amount of self-consigned power in chronological order for each unit of time in this way, the user can understand that self-consignment is being carried out appropriately when surplus power is generated. 【0065】 This example demonstrates the use of a stacked bar graph to represent power data, but it is not limited to stacked bar graphs; stacked line graphs, stacked area graphs, or pie charts may also be used. 【0066】 (2) Second Embodiment Next, the differences between the second embodiment and the first embodiment described above will be explained. 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 described above. In the second embodiment, it is assumed that the correspondence between the power transmission side microgrid 100T and the power receiving side microgrid 100R is not one-to-one, but rather one-to-many. 【0067】 In the second embodiment, when the control unit 330 of the power management device 300 transmits power from one transmitting microgrid 100T to two or more receiving microgrids 100R by self-transmission, it displays the amount of self-transmissioned power on the display device 200 in a manner that allows for the identification of the distribution of the amount of self-transmissioned power to the two or more receiving microgrids 100R. Here, "a manner that allows for the identification of the distribution of the amount of self-transmissioned power" may mean simultaneously displaying text (numerical values, etc.) and / or a graph showing the amount of self-transmissioned power transmitted by the transmitting microgrid 100T, and text and / or a graph showing the amount of self-transmissioned power received by each of the two or more receiving microgrids 100R. Alternatively, "a manner that allows for the identification of the distribution of the amount of self-transmissioned power" may mean calculating the proportion (distribution) of the amount of self-transmissioned power received by each of the two or more receiving microgrids 100R out of the amount of self-transmissioned power transmitted by the transmitting microgrid 100T, and displaying the calculated proportions for each. The following explanation will primarily focus on an example where a bar graph showing the amount of self-transmitted power transmitted by the transmitting microgrid 100T and stacked bar graphs showing the amount of self-transmitted power received by each of the two or more receiving microgrids 100R are displayed side by side. 【0068】 This allows users in the transmission-side microgrid 100T to easily understand the allocation of power to their transmission destinations in self-transmission based on the information displayed on the display device 200. 【0069】 Furthermore, in the second embodiment, when the control unit 330 of the power management device 300 transmits power from two or more transmitting microgrids 100T to one receiving microgrid 100R by self-transmission, it displays the amount of self-transmissioned power on the display device 200 in a manner that allows identification of the distribution of the amount of self-transmissioned power from the two or more transmitting microgrids 100T. 【0070】 This allows users in the receiving microgrid 100R to easily understand the allocation of the transmission source in self-transmission based on the display content of the display device 200. 【0071】 Figure 8 shows a first example of operation of the power management system 1 according to the second embodiment. In this example, power is transmitted from one transmitting microgrid 100T to two receiving microgrids 100R1 and 100R2 by self-consignment. 【0072】 In the example shown in Figure 8, during a certain unit of time (target unit of time), the transmission-side microgrid 100T outputs surplus power X [kWh] from the transmission-side microgrid 100T to the power system 10 according to the transmission plan. The management unit 320 of the power management device 300 manages the transmission-side power data showing X [kWh] as the amount of self-transmissioned power of the transmission-side microgrid 100T during the target unit of time. 【0073】 During the target unit time, the receiving 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 power data, which represents A [kWh], as the amount of self-transmitted power of the receiving microgrid 100R1 during the target unit time. Here, the management unit 320 of the power management device 300 manages the receiving power data, which represents A [kWh], in association with the transmitting power data, which represents X [kWh]. 【0074】 During the target unit time, the 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 receiving power data showing B[kWh] as the amount of self-transmitted power of the receiving microgrid 100R2 during the target unit time. Here, the management unit 320 of the power management device 300 manages the receiving power data showing B[kWh] in association with the transmitting power data showing X[kWh]. 【0075】 The control unit 330 of the power management device 300 then displays the amount of self-transmitted power on the transmission-side display device 200T in a manner that allows for the identification of the distribution of self-transmitted power from the transmission-side microgrid 100T to the two receiving-side microgrids 100R1 and R2. For example, the transmission-side display device 200T displays side by side a bar graph showing the amount of self-transmitted power (X[kWh]) of the transmission-side microgrid 100T and a bar graph showing the stacked amounts of self-transmitted power (A[kWh] and B[kWh]) of the two receiving-side microgrids 100R1 and R2, respectively. That is, the transmission-side display device 200T displays a graph showing that of the amount of self-transmitted power X[kWh] of the transmission-side microgrid 100T, A[kWh] was transmitted to the receiving-side microgrid 100R1 and B[kWh] was transmitted to the receiving-side microgrid 100R2. Here, the control unit 330 of the power management device 300 may display the identifier of the receiving side microgrid 100R1 in association with A[kWh], and the identifier of the receiving side microgrid 100R2 in association with B[kWh]. 【0076】 This type of display control allows users in the transmitting microgrid 100T to easily understand the distribution of self-transmitted power to the two receiving microgrids 100R1 and R2 based on the display content of the transmitting display device 200T. 【0077】 Figure 9 shows a second example of operation of the power management system 1 according to the second embodiment. In this example, power is transmitted from two transmitting microgrids 100T1 and 100T2 to one receiving microgrid 100R by self-consignment. 【0078】 In the example shown in Figure 9, during a certain unit of time (target unit of time), the transmission-side microgrid 100T1 outputs surplus power C [kWh] from the transmission-side microgrid 100T1 to the power system 10 according to the transmission plan. The management unit 320 of the power management device 300 manages the transmission-side power data showing C [kWh] as the amount of self-transmissioned power of the transmission-side microgrid 100T1 during the target unit of time. 【0079】 During the target unit time, the transmission-side microgrid 100T2 outputs surplus power D [kWh] from the transmission-side microgrid 100T2 to the power system 10 according to the transmission plan. The management unit 320 of the power management device 300 manages the transmission-side power data showing D [kWh] as the amount of self-transmissioned power of the transmission-side microgrid 100T2 during the target unit time. 【0080】 During the target unit time, the receiving 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 power data, which represents Y [kWh], as the amount of self-transmitted power of the receiving microgrid 100R during the target unit time. Here, the management unit 320 of the power management device 300 manages the receiving power data, which represents Y [kWh], in association with the transmitting power data, which represents C [kWh], and the transmitting power data, which represents D [kWh]. 【0081】 The control unit 330 of the power management device 300 then displays the amount of self-transmitted power on the receiving-side display device 200R in a manner that allows for the identification of the distribution of self-transmitted power from the two transmitting-side microgrids 100T1 and 100T2. For example, the receiving-side display device 200R displays side by side a bar graph showing the amount of self-transmitted power (Y[kWh]) of the receiving-side microgrid 100R and a bar graph showing the stacked amounts of self-transmitted power (C[kWh] and D[kWh]) of the two transmitting-side microgrids 100T1 and T2, respectively. That is, the receiving-side display device 200R displays a graph showing that of the amount of self-transmitted power Y[kWh] of the receiving-side microgrid 100R, C[kWh] was transmitted from the transmitting-side microgrid 100T1 and D[kWh] was transmitted from the transmitting-side microgrid 100T2. Here, the control unit 330 of the power management device 300 may display the identifier of the transmission-side microgrid 100T1 in association with C[kWh], and the identifier of the transmission-side microgrid 100T2 in association with D[kWh]. 【0082】 This type of display control allows users in the receiving microgrid 100R to easily understand the distribution of self-transmitted power from the two transmitting microgrids 100T1 and T2 based on the display content of the receiving display device 200R. 【0083】 The examples in Figures 8 and 9 show power data for a given unit of time, but as shown in Figures 10 and 11, power data for multiple consecutive unit times may also be displayed in chronological order. 【0084】 Figure 10 shows an example of displaying transmission-side power data during a period when a certain microgrid 100 (self-microgrid) transmits power to two receiving-side microgrids 100R (other grids 1 and 2) through self-transmission. In the example shown in Figure 10, the display device 200 displays the power data of the transmission-side microgrid 100T in chronological order for each 30-minute unit time. Here, similar to the first embodiment, an example is shown in which the amount of self-transmission power on the transmission side is displayed as "power consumption". Specifically, the amount of self-transmission power on the transmission side is displayed separately as "power consumption of other grid 1" and "power consumption of other grid 2". 【0085】 Figure 11 shows an example of displaying power data on the receiving side during a period when a certain microgrid 100 (self-microgrid) receives power from two transmitting microgrids 100T (other grids 1 and 2) through self-transmission. In the example shown in Figure 11, the display device 200 displays the power data of the receiving microgrid 100R in chronological order for each 30-minute unit time. Here, similar to the first embodiment, an example is shown in which the amount of self-transmitted power on the receiving side is displayed as "power generated." Specifically, the amount of self-transmitted power on the receiving side is displayed separately as "power generated by other grid 1" and "power generated by other grid 2." 【0086】 This example demonstrates the use of a stacked bar graph to represent power data, but it is not limited to stacked bar graphs; stacked line graphs, stacked area graphs, or pie charts may also be used. 【0087】 (3) Third Embodiment Next, the differences between the third embodiment and the first and second embodiments described above will be explained. The configurations of the power management system 1, display device 200, and power management device 300 according to the third embodiment are the same as those of the first embodiment described above. 【0088】 In the third embodiment, we consider a case where one microgrid 100 can be either the transmitting or receiving side in a self-transmission system. For example, as shown in Figure 12, among multiple microgrids with different timings for generating surplus power, the relationship between the transmitting and receiving sides in a self-transmission system may be reversed depending on the time of day. In the example in Figure 12, microgrid 100a has a base-load power source (e.g., a hydroelectric power plant or a geothermal power plant) as a distributed power source 110a, and microgrid 100b has an environmentally variable power source (e.g., a solar cell plant) as a distributed power source 110b. 【0089】 In microgrid 100a, surplus power is generated during the first time period (referred to here as "nighttime") when the power consumption of the power load 120a is low. On the other hand, in microgrid 100b, the amount of power generated by distributed power source 110b is low during nighttime, resulting in a power shortage. Therefore, during nighttime hours, power is transmitted from microgrid 100a to microgrid 100b via self-transmission. In this case, microgrid 100a becomes the transmitting microgrid 100T, and microgrid 100b becomes the receiving microgrid 100R. 【0090】 In microgrid 100b, surplus power is generated during the second time period (referred to here as "daytime") when the distributed power source 110b generates a large amount of electricity. On the other hand, in microgrid 100a, the power consumption of the power load 120a is high during the daytime, resulting in a power shortage. Therefore, during the daytime, power is transmitted from microgrid 100b to microgrid 100a via self-transmission. In this case, microgrid 100a becomes the receiving microgrid 100R, and microgrid 100b becomes the transmitting microgrid 100T. 【0091】 Under these assumptions, the control unit 330 of the power management device 300 sets a power transmission capability setting for each of the multiple microgrids 100, indicating whether or not it can operate as a power transmission-side microgrid 100T, and a power reception capability setting indicating whether or not it can operate as a power reception-side microgrid 100R. This allows for appropriate management of self-transmission under the assumption that each microgrid 100 can be either a power transmission-side or a power reception-side microgrid. Alternatively, only the power transmission capability setting may be performed, or only the power reception capability setting may be performed. 【0092】 The control unit 330 of the power management device 300 may set whether or not to transmit power and whether or not to receive power for each of the multiple microgrids 100 on a time-by-time basis. The time-by-time period may be an integer multiple of a unit time (for example, 30 minutes). 【0093】 The control unit 330 of the power management device 300 controls the display device 200 (transmission-side display device 200T) to display transmission-side power data for the microgrid 100 that has been set as the transmission-side microgrid 100T by the power transmission feasibility setting. Here, the control unit 330 of the power management device 300 may also perform display control to display the amount of self-transmitted power of the microgrid 100 (transmission-side microgrid 100T) as "power consumption," similar to the first embodiment. When the microgrid 100 (transmission-side microgrid 100T) transmits power to two or more receiving-side microgrids 100R by self-transmission, the control unit 330 of the power management device 300 may also perform display control to display the amount of self-transmitted power in a manner that allows identification of the distribution of the amount of self-transmitted power to the two or more receiving-side microgrids 100R, similar to the second embodiment. On the other hand, the control unit 330 of the power management device 300 controls the display device 200 so as not to display power transmission data for microgrids 100 that are not set as transmission-side microgrids 100T according to the power transmission availability setting. 【0094】 Furthermore, the control unit 330 of the power management device 300 controls the display device 200 (receiving-side display device 200R) to display receiving-side power data for the microgrid 100 that has been set as the receiving-side microgrid 100R by the power reception availability setting. Here, the control unit 330 of the power management device 300 may also perform display control to display the amount of self-transmitted power of the microgrid 100 (receiving-side microgrid 100R) as "power generated power," similar to the first embodiment. When the microgrid 100 (receiving-side microgrid 100R) receives power from two or more transmitting-side microgrids 100T by self-transmission, the control unit 330 of the power management device 300 may also perform display control to display the amount of self-transmitted power in a manner that allows identification of the distribution of the amount of self-transmitted power from the two or more transmitting-side microgrids 100T, similar to the second embodiment. On the other hand, the control unit 330 of the power management device 300 controls the display device 200 so as not to display power data for microgrids 100 that are not set as power-receiving microgrids 100R according to the power reception availability setting. 【0095】 Figure 13 shows an example of the operation of the power management system 1 according to the third embodiment. Here, we show an example in which the power management device 300 manages self-transmission in a self-transmission group consisting of three microgrids 100. 【0096】 The management unit 320 of the power management device 300 manages the self-transmission group settings, including the settings for whether to transmit power and whether to receive power for each of the microgrids 100a to 100c. The control unit 330 of the power management device 300 sets the settings for whether to transmit power and whether to receive power for each of the microgrids 100a to 100c based on the self-transmission group settings. 【0097】 In the example shown in Figure 13, the microgrid 100a is set to enable both power transmission and power reception in self-consignment (ON). 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 reception side power data for the microgrid 100a. 【0098】 The microgrid 100b is set to enable power transmission in self-transmission (ON) and to disable power reception in self-transmission (OFF). 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 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 reception data for the microgrid 100b. 【0100】 Thus, according to the third embodiment, it becomes possible to set the power transmission and reception settings for self-consignment for each microgrid 100, making it possible to appropriately display only the power data necessary for each microgrid 100. 【0101】 (4) Fourth Embodiment Next, the differences between the fourth embodiment and the first to third embodiments described above will be explained. The configurations of the power management system 1, display device 200, and power management device 300 according to the fourth embodiment are the same as those of the first embodiment described above. 【0102】 As described above, when it is possible to transmit power from one transmitting microgrid 100T to two or more receiving microgrids 100R through self-transmission, the question arises as to how to determine the allocation of the self-transmissioned power to those two or more receiving microgrids 100R. 【0103】 In the fourth embodiment, the control unit 330 of the power management device 300 sets a transmission priority for each of the other microgrids 100 when transmitting power from one microgrid 100 to another microgrid 100 by self-transmission. That is, when transmitting power to two or more receiving microgrids 100R by self-transmission, a priority is set in the transmission settings for each receiving microgrid 100R. 【0104】 This makes it possible for each microgrid 100 to plan a self-consignment system that offers the most economic benefits to the entity (microgrid administrator) to which it belongs. 【0105】 The control unit 330 of the power management device 300 may set a power transmission priority for each of the two or more receiving microgrids 100R for each time period. The time period may be an integer multiple of a unit time (for example, 30 minutes). 【0106】 Figure 14 shows an example of operation of the power management system 1 according to the fourth embodiment. Here, we assume a case where power can be transmitted from the transmitting microgrid 100T to two receiving microgrids 100R1 and 100R2 by self-transmission. 【0107】 Firstly, the management unit 320 of the power management device 300 manages the transmission priority for each of the receiving microgrids 100R1 and 100R2 when transmitting power from the transmitting microgrid 100T to the receiving microgrids 100R1 and 100R2 by self-transmission. In the example in Figure 14, the receiving microgrid 100R1 is managed as having a "high" transmission priority, and the receiving microgrid 100R1 is managed as having a "low" transmission priority. Such transmission priorities may be determined by the microgrid manager. 【0108】 Secondly, the control unit 330 of the power management device 300 sets the transmission priority for each of the receiving microgrids 100R1 and 100R2 when transmitting power from the transmitting microgrid 100T to the receiving microgrids 100R1 and 100R2 by self-transmission. For example, the control unit 330 of the power management device 300 sets the receiving microgrid 100R1 to have a "high" transmission priority and the receiving microgrid 100R2 to have a "low" transmission priority. In this case, when the receiving microgrid 100R1 receives power from the transmitting microgrid 100T by self-transmission, it may receive more power than the receiving microgrid 100R2. Alternatively, the receiving microgrid 100R2 may not receive power from the transmitting microgrid 100T through self-transmission, while the receiving microgrid 100R2 alone may receive power from the transmitting microgrid 100T through self-transmission. 【0109】 (4.1) Example of modification of the fourth embodiment Next, we will explain the differences between the modified version of the fourth embodiment described above and the modified version. In the fourth embodiment described above, it was assumed that the power transmission priority was fixed in advance, but in this modified version, the power transmission priority can be set more flexibly. 【0110】 In this modified example, the control unit 330 of the power management device 300 determines the transmission priority for each of the other microgrids 100 when transmitting power from one microgrid 100 to another microgrid 100 by self-transmission. Specifically, the control unit 330 of the power management device 300 determines the transmission priority using a determination method selected from among multiple determination methods with different determination criteria for determining the transmission priority. This makes it possible to determine the priority of each receiving microgrid 100R even if there is no priority setting in the transmission settings for each receiving microgrid 100R when transmitting power to multiple receiving microgrids 100R by self-transmission. The control unit 330 of the power management device 300 may also switch the determination method for determining the transmission priority depending on the time period. The time period may be an integer multiple of a unit time (for example, 30 minutes). 【0111】 Here, examples of multiple determination methods with different criteria for determining power transmission priority include the following determination methods a to d. 【0112】 "Determination method a" is a method that prioritizes transmitting power to a microgrid if there is a microgrid among the candidate receiving microgrids that can achieve peak reduction through transmitted power. "Determination method a" may also be a determination method that prioritizes microgrid 100 that can achieve peak reduction through self-transmission power, at least during the time period when self-transmission is performed. 【0113】 "Determination method b" is a method that prioritizes transmitting power to a microgrid if there is a microgrid within the candidate receiving microgrid that has a rechargeable energy storage facility. Here, charging is planned for the energy storage facility within the receiving microgrid during that time. "Determination method b" may also be a determination method that prioritizes microgrid 100 that has a battery that can be charged by self-transmissioned power at least during the time when self-transmission is performed. 【0114】 "Determination method c" is a method that prioritizes transmitting power to a microgrid if there is a microgrid among the candidate receiving microgrids that has low reliability of supply and demand plan values ​​(i.e., a wide confidence interval for the forecast). According to "Determination method c," it is possible to suppress the shortage imbalance in the receiving microgrid. "Determination method c" may also be a determination method that prioritizes microgrid 100 in which the value indicating the reliability of supply and demand plan values ​​during the time period in which self-transmission is performed is below a predetermined value. 【0115】 "Determination method d" is a method of prioritizing the transmission of power to the microgrid with the highest electricity rate per unit during the transmission period, after understanding the electricity rate plans of the candidate receiving microgrids. "Determination method d" may also be a method of prioritizing the microgrid 100 with the highest electricity rate per unit from the power grid 10 (purchased power) during the period when self-transmission is performed. 【0116】 Figure 15 shows an example of the operation of the power management system 1 according to a modified example of the fourth embodiment. Here, we assume a case where power can be transmitted from the transmitting microgrid 100T to two receiving microgrids 100R1 and 100R2 by self-transmission. 【0117】 Firstly, the management unit 320 of the power management device 300 manages the determination method for determining the transmission priority when transmitting power from the transmitting microgrid 100T to the receiving microgrids 100R1 and 100R2 by self-transmission, in correspondence with the determination order. In the example in Figure 15, the first determination method used is "Determination Method 1," and the second determination method used is "Determination Method 2." Such determination method settings may be determined by the microgrid manager. 【0118】 Secondly, the control unit 330 of the power management device 300 first uses "Determination Method 1" to determine the power transmission priority for the receiving microgrids 100R1 and 100R2. If the power transmission priority cannot be determined using "Determination Method 1", the control unit 330 of the power management device 300 then uses "Determination Method 2" to determine the power transmission priority for the receiving microgrids 100R1 and 100R2. Once the power transmission priority is determined in this way, the control unit 330 of the power management device 300 sets the determined power transmission priority for each of the receiving microgrids 100R1 and 100R2. 【0119】 (5) Other embodiments In the fourth embodiment and its modifications described above, an example of setting a priority for multiple receiving microgrids 100R in a case where the receiving microgrid 100R requires power was mainly explained regarding the power transmission priority. However, the power management device 300 may also set a transmitting microgrid 100T that will transmit power with priority over other transmitting microgrids 100T among the multiple transmitting microgrids 100T. For example, under the premise that there is one transmitting microgrid 100T and another transmitting microgrid 100T, the power management device 300 may set one of the transmitting microgrids 100T to transmit power preferentially based on the type of power generation equipment that the transmitting microgrid 100T has. 【0120】 In the above embodiment, a configuration in which the display device 200 is located within the microgrid 100 was used as an example, but the configuration is not limited to this. As shown in Figure 16, the display device 200 only needs to be able to access the power management device 300, and the display device 200 may be located outside the microgrid 100. The power management device 300 may decide which microgrid 100's power data to display on the display device 200 when the display device 200 authenticates (logs in) to the power management device 300. For example, the power management device 300 may maintain 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 perform the operations according to the above embodiment. The program may be recorded on a computer-readable medium. Using a computer-readable medium, it is possible to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or DVD-ROM. Furthermore, the circuits that perform the operations performed in the above embodiment may be integrated to form a semiconductor integrated circuit (chipset, SoC). 【0122】 The terms “include,” “comprise,” and their variations as used in this disclosure do not mean that only the listed items are included, but that the listed items may be included, or that additional items may be included in addition to the listed items. Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR. The terms “based on” and “according to” as used in this disclosure do not mean “based only on” or “according only to” unless otherwise specified. “Based on” means both “based only on” and “based at least partially on.” Similarly, “according to” means both “based only on” and “according at least partially to.” Moreover, any reference to elements using designations such as “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way to distinguish between two or more elements. Therefore, references to first and second elements do not mean that only two elements may be employed therein, or that the first element must precede the second element in any way. In this disclosure, if articles are added by translation, such as a, an, and the in English, these articles shall be plural unless it is clearly indicated otherwise from the context. 【0123】 Although the embodiments have been described in detail above with reference to the drawings, the specific configuration is not limited to those described above, and various design changes can be made without departing from the gist of the invention. [Explanation of Symbols] 【0124】 1: Power Management System 10: Power system 20: Communication Network 100: Microgrids 100T: Transmission-side microgrid 100R: Receiving side 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

[Claim 1] A power management system for managing power transmission performed by self-consignment between multiple grids via the power system, A management unit that manages the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission, The system includes a control unit that causes the amount of self-transmitted power to be displayed on a display device, When the control unit displays the amount of self-transmissioned power for the power transmission grid, it considers the amount of self-transmissioned power as the power consumption of the power transmission grid and displays it on the display device. Power management system. [Claim 2] A power management system for managing power transmission performed by self-consignment between multiple grids via the power system, A management unit that manages the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission, The system includes a control unit that causes the amount of self-transmitted power to be displayed on a display device, When the control unit displays the amount of self-transmitted power for the receiving grid, it considers the amount of self-transmitted power as the amount of power generated by the receiving grid and displays it on the display device. Power management system. [Claim 3] When the control unit transmits the surplus power amount from the transmitting grid to the receiving grid via self-transmission, it causes the control unit to display the surplus power amount as the amount of power consumed on the display device. The power management system according to claim 1. [Claim 4] The control unit performs a power transmission setting for each of the plurality of grids, determining whether or not it can operate as the power transmission grid, and a power reception setting for whether or not it can operate as the power reception grid. The power management system according to any one of claims 1 to 3. [Claim 5] The control unit sets the power transmission priority for each of the other grids when transmitting power from one grid to another grid by self-transmission. The power management system according to any one of claims 1 to 4. [Claim 6] The control unit determines the transmission priority when transmitting power from one grid to another grid by self-transmission, using a determination method selected from a plurality of determination methods with different determination criteria for determining the transmission priority, for each of the other grids. The power management system according to any one of claims 1 to 5. [Claim 7] A display device used in a power management system that manages power transmission performed by self-consignment between multiple grids via the power system, The system includes a display unit that displays the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission. When the display unit displays the amount of self-transmissioned power for the transmission grid, it displays the amount of self-transmissioned power as the amount of power consumed by the transmission grid. Display device. [Claim 8] A display device used in a power management system that manages power transmission performed by self-consignment between multiple grids via the power system, The system includes a display unit that displays the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission. When the display unit displays the amount of self-transmitted power for the receiving grid, it displays the amount of self-transmitted power as the amount of power generated by the receiving grid. Display device. [Claim 9] A power management method used in a power management system that manages power transmission performed by self-consignment between multiple grids via a power system, The system includes a step of displaying the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission. The display step includes, when displaying the amount of self-consigned power for the transmission grid, the step of displaying the amount of self-consigned power as the amount of power consumed by the transmission grid. Power management methods. [Claim 10] A power management method used in a power management system that manages power transmission performed by self-consignment between multiple grids via a power system, The system includes a step of displaying the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission. The display step includes, when displaying the amount of self-transmitted power for the receiving grid, the step of treating the amount of self-transmitted power as the amount of power generated by the receiving grid and displaying it accordingly. Power management methods. [Claim 11] A display device used in a power management system that manages power transmission between multiple grids via self-consignment over the power grid, The step of displaying the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission, is performed. The step of displaying the information includes, when displaying the amount of self-transmissioned power for the transmission grid, the step of treating the amount of self-transmissioned power as the amount of power consumed by the transmission grid and displaying it on the display device. program. [Claim 12] A display device used in a power management system that manages power transmission between multiple grids via self-consignment over the power grid, The step of displaying the amount of self-transmissioned power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the aforementioned self-transmission, is performed. The step of displaying the above includes, when displaying the amount of self-transmitted power for the receiving grid, the step of treating the amount of self-transmitted power as the amount of power generated by the receiving grid and displaying it on the display device. program.

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