JP7754766B2 - Power management system, display device, power management method, and program - Google Patents

Description

The present invention relates to a power management system, a display device, a power management method, and a program.

Conventionally, self-dispatch transmission is 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 grid managed by a power transmission and distribution company or the like (see, for example, Patent Document 1).

Microgrids are also known that are connected to a power grid and have distributed power sources and power loads that consume the output power of the distributed power sources (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 2021-87278 JP 2022-13180 A

In order for users to understand data related to electricity, it is important to "visualize electricity," and it is preferable for a display device to display graphs showing the amount of electricity generated by distributed power sources and graphs showing the amount of electricity consumed by power loads. However, when self-consignment is performed between grids such as microgrids, the amount of self-consignment electricity can be perceived differently on the transmitting and receiving sides, which creates the problem that there is no unique method for displaying the amount of self-consignment electricity.

The present invention aims to provide a power management system, display device, power management method, and program that can appropriately display the amount of power self-consignment between grids.

The power management system according to the first aspect is a system that manages 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 amount of power, which is the amount of power transmitted from the transmitting grid to the receiving grid by the self-consignment, and a control unit that displays the self-consignment amount of power on a display device. The control unit displays the self-consignment amount of power differently depending on whether the control unit displays the self-consignment amount for the transmitting grid or the receiving grid.

The display device according to the second aspect is a device used in an energy management system that manages power transmission between multiple grids via a power system by self-consignment. The display device includes a display unit that displays the self-consigned power amount, which is the amount of power transmitted from the transmitting grid to the receiving grid by the self-consignment. The display unit displays the self-consigned power amount in different ways when displaying the self-consigned power amount for the transmitting grid and when displaying the self-consigned power amount for the receiving grid.

A power management method according to a third aspect is a method used in a power management system that manages power transmission between multiple grids via a power system by self-consignment. The power management method includes a step of displaying a self-consignment power amount, which is the amount of power transmitted from the transmitting grid to the receiving grid by the self-consignment. The display step includes a step of displaying the self-consignment power amount in different ways when displaying the self-consignment power amount for the transmitting grid and when displaying the self-consignment power amount for the receiving grid.

A program according to a fourth aspect causes a display device used in a power management system that manages power transmission between multiple grids via a power system to execute a step of displaying a self-consigned power amount, which is the amount of power transmitted from the transmitting grid to the receiving grid via the self-consigned power transmission. The display step includes a step of displaying the self-consigned power amount in different ways when displaying the self-consigned power amount for the transmitting grid and when displaying the self-consigned power amount for the receiving grid.

One aspect of the present invention provides a power management system, display device, power management method, and program that can appropriately display the amount of power self-consignment between grids.

1 is a diagram illustrating an example of the overall configuration of a power management system according to an embodiment; FIG. 1 illustrates an example of the configuration of a power management device according to an embodiment. 1 is a diagram illustrating an example of the configuration of a display device according to an embodiment. FIG. 2 is a diagram illustrating an operation flow of the power management system according to the embodiment. FIG. 2 is a diagram illustrating an example of operation of the power management system according to the first embodiment. 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. 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. FIG. 10 is a diagram illustrating a first operation example of the power management system according to the second embodiment. FIG. 10 is a diagram illustrating a second operation example of the power management system according to the second embodiment. FIG. 10 is a diagram showing an example of display of power transmission-side power data during a time period when power is transmitted to two power receiving-side microgrids (other grids 1 and 2) by self-consignment. FIG. 10 is a diagram showing an example of display of receiving-side power data during a time period when power is received from two transmitting-side microgrids (other grids 1 and 2) by self-consignment. FIG. 10 is a diagram for explaining a third embodiment. FIG. 11 is a diagram illustrating an example of the operation of a power management system according to a third embodiment. FIG. 11 is a diagram illustrating an example of the operation of a power management system according to a fourth embodiment. FIG. 13 is a diagram illustrating an example of the operation of a power management system according to a modification of the fourth embodiment. FIG. 10 illustrates a modified example of the configuration of the power management system.

The power management system according to the embodiment will be described with reference to the drawings. In the drawings, identical or similar parts are designated 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."

(1) First Embodiment (1.1) Configuration of 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.

The power management system 1 shown in FIG. 1 includes multiple microgrids 100 (100a, 100b, 100c, etc.) connected to a power system 10, multiple display devices 200 (200a, 200b, 200c, etc.), and a power management device 300. While 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 device 300 are connected to each other so that they can communicate with each other via a communication network 20. The communication network 20 includes at least one of a LAN (Local Area Network), a WAN (Wide Area Network), and the Internet.

Each microgrid 100 is located geographically separate from the 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 (geographic range)" having distributed power sources 110 and/or power loads 120.

Each microgrid 100 belongs to the same entity. Here, "the same entity" is not limited to cases where the entities to which each microgrid 100 belongs are completely identical (for example, cases where 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 such a close relationship that they can be considered to be the same entity (for example, cases where they are a company and its group companies) are also included in the "same entity."

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 that manages 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.

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 a distributed power source 110 and a power load 120, any microgrid 100 may have only one of a distributed power source 110 and a power load 120. The distributed power source 110 includes power generation equipment such as a solar power generation equipment and/or a fuel cell equipment. The power generation equipment may be a wind power generation equipment, a geothermal power generation equipment, and/or a biomass power generation equipment. The distributed power source 110 may further include a storage battery equipment. The power load 120 is a device that consumes (uses) power.

Here, we will assume that each microgrid 100 is configured similarly, and will use microgrid 100a as an example for explanation. Microgrid 100a has a distributed power source 110a and a power load 120a connected to a power line 101a. Power line 101a may be a power line (e.g., a private line) managed by the entity to which microgrid 100a belongs, or may be part of the power system 10. Power line 101a is connected to the power system 10 at a power receiving point 102a. Power load 120a consumes power supplied via power line 101a, specifically, power supplied from distributed power source 110a and/or power supplied from the power system 10. Similarly, microgrid 100b has a distributed power source 110b and a power load 120b connected to power line 101b (and power receiving point 102b). The microgrid 100c has a distributed power source 110c and a power load 120c connected to a power line 101c (and a power receiving point 102c).

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, 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.

Each display device 200 communicates with the power management device 300 via the communication network 20 and displays the power data received from the power management device 300. The display device 200 may be, for example, a mobile terminal such as a smartphone, tablet terminal, laptop computer (PC), or wearable terminal. The display device 200 may also be a fixed terminal such as a desktop PC or electronic signage.

In the power management system 1, power is transmitted from one microgrid 100 to another microgrid 100 via the power system 10 by self-consignment. This makes it possible, for example, for surplus power within one microgrid 100, output (generated) by a distributed power source 110, minus power consumed by the power load 120, to be efficiently consumed in another microgrid 100. Furthermore, self-consignment from power generation equipment located in remote locations can increase self-consumption across multiple bases. Furthermore, the ability to share generated power between bases can increase the proportion of renewable energy, contributing to reducing carbon dioxide emissions across a company and/or the entire group.

However, self-dispatch uses a power grid 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-dispatch 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 the power output from a certain microgrid 100a (here, synonymous with the power transmitted by self-dispatch), 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).

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 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 (power flow amount), and the amount of power self-transferred (hereinafter referred to as "self-transferred power amount"). Here, "power amount" is not limited to the accumulated amount of power (kWh) over a certain period (e.g., 30 minutes) and may also be instantaneous power (kW). Below, we will mainly assume that "power amount" is the accumulated amount of power (kWh). Furthermore, "power amount" is not limited to a measured value and may also be a predicted value. In the following, we will mainly assume that "electric energy" is a measured value.

The power management device 300 controls the display to "visualize 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 graphs showing the amount of power generated by the distributed power source 110a, graphs showing the amount of power consumed by the power load 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 the microgrid 100b. The power management device 300 controls the display device 200c to display power data related to the microgrid 100c.

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

(1.2) Configuration of the Power Management Apparatus Next, a description will be given of the configuration of the power management apparatus 300 according to the first embodiment. FIG.

The power management device 300 shown in FIG. 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.

Under the control of the control unit 330, the communication unit 310 performs data communication via the communication network 20. 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 smart meters and/or sensors installed in each microgrid 100. The communication unit 310 also transmits power data to the display device 200 to be displayed on the display device 200.

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

The management unit 320 manages, as power data, the self-consignment power amount, which is the amount of power transmitted from the transmitting-side microgrid to the receiving-side microgrid through 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 in accordance with 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 in accordance with 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.

For each microgrid 100, the management unit 320 may further manage 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 (amount of power generated, amount of power consumed, and/or 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.

The control unit 330 includes at least one processor and controls the communication unit 310 and management unit 320 by executing programs stored in the memory unit 311. 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 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 self-transmitted power amount on the display device 200. The control unit 330 changes the display format 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 format 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.

In this way, by displaying the self-consigned power amount for the transmitting side microgrid 100T and the self-consigned power amount for the 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 transmitting side and the receiving side. Therefore, under the premise that the transmitting side and the receiving side may perceive the self-consigned power amount differently, it is possible to display the amount appropriate for each of the transmitting side and the receiving side.

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

As a result, even if a user of the power transmitting microgrid 100T does not have knowledge about self-consignment, they can easily understand the amount of self-consignment power on the power transmitting side as the amount of power consumed based on the content displayed on the display device 200. Furthermore, users can understand that surplus power on the power transmitting microgrid 100T is being consumed on the power receiving microgrid 100R, which makes it possible to appeal to users the benefits of self-consignment.

In the first embodiment, when displaying the self-consigned power amount for the power receiving microgrid 100R, the control unit 330 performs display control to cause the display device 200 to display the self-consigned power amount as the "power generation amount." For example, when the power receiving microgrid 100R receives power from the power grid 10 separately from purchased power, the control unit 330 controls the display device 200 to display the received power amount as the power generation amount.

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

(1.3) Configuration of the Display Device Next, a description will be given of the configuration of the display device 200 according to the first embodiment. FIG.

The display device 200 shown in FIG. 3 has a communication unit 210, a display unit 220, an operation unit 230, a control unit 240, and a memory unit 250. The communication unit 210, the display unit 220, the operation unit 230, the control unit 240, and the memory unit 250 are connected by a bus 201.

Under the control of the control unit 240, the communication unit 210 performs data communication via the communication network 20. 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 device 300 via the communication network 20. Such communication includes wireless communication 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.

The display unit 220 displays an image. The display unit 220 may be configured as 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).

The operation unit 230 accepts user operations (user inputs). 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.

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 (such as integrated circuits and/or discrete circuits) connected to enable communication. The control unit 240 controls the communication unit 210, display unit 220, and memory unit 250 by executing a program stored in the memory 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.

In the first embodiment, the "control unit" that controls the display of power data may be configured solely by the control unit 330 of the power management device 300, or solely by the control unit 240 of the display device 200, or may be configured solely by both the control unit 330 and the control unit 240.

The storage unit 250 is configured to include various types of memory, such as ROM, RAM, and auxiliary storage devices. The programs executed by the control unit 240 are stored, for example, in the ROM and/or auxiliary storage devices of the storage unit 250.

(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.

(1.4.1) Operation Flow FIG. 4 is a diagram showing the operation flow of the power management system 1 according to the first embodiment.

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 makes it possible to identify whether it is the power transmitting side or the power receiving side.

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 of the power transmitting side or the self-consigned power amount of the power receiving side.

If the self-consigned energy amount on the power transmission side is determined (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 format. In the first embodiment, the control unit 330 controls the display device 200 to display the self-consigned energy amount as "power consumption amount."

On the other hand, if the self-consigned amount of power on the power receiving side is determined (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 format. In the first embodiment, the control unit 330 controls the display device 200 to display the self-consigned amount of power as "generated power amount."

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

In the example of Figure 5, assume 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."

In the example of Figure 5, the power management device 300 displays the power data of the power transmitting side microgrid 100T for the target unit time in the form of a stacked bar graph on the power transmitting side display device 200T. The power management device 300 also displays the power data of the power receiving side microgrid 100R for the target unit time in the form of a stacked bar graph on the power receiving side display device 200R.

The power transmission side display device 200T displays a bar graph showing the amount of power generated by the distributed power sources 110 of the power transmission side microgrid 100T and a bar graph showing the amount of power consumed by the power loads 120 of the power transmission 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 transmission 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 transmission side microgrid 100T. Here, even though this surplus power is not consumed by the power transmission side microgrid 100T, the power transmission side display device 200T may display this surplus power as the amount of power consumed by the power 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 makes it possible to distinguish between the power consumption of the power loads 120 of the power transmission side microgrid 100T and the power consumption corresponding to the self-consignment power amount.

The power receiving side display device 200R displays a bar graph showing the amount of power consumed by the power load 120 of the power receiving side microgrid 100R and a bar graph showing 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-consignment power received by self-consignment. The power receiving side display device 200R displays the amount of self-consignment power as the amount of power generated in the power data of the power receiving side microgrid 100R. Here, even though this self-consignment power is not generated by the power receiving side microgrid 100R, the power receiving side display device 200R may display this amount of self-consignment power as the amount of power generated by the power 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 makes it possible to distinguish between 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 self-consignment power amount.

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

In this operation example, an example was described in which a stacked bar graph was used as a graph representing power data, but this is not limited to a stacked bar graph, and stacked line graphs, stacked area graphs, pie charts, etc. may also be used.

(2) Second Embodiment Next, a second embodiment will be described, focusing on differences from the first embodiment. The configurations of the power management system 1, the display device 200, and the 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 relationship between the power transmitting side microgrid 100T and the power receiving side microgrid 100R is not one-to-one but one-to-many.

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 identifiable" 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 identifiable" 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. The following mainly describes an example in which a bar graph showing the amount of self-consignment power transmitted by the power transmitting side microgrid 100T and a stacked bar graph showing the amount of self-consignment power received by each of two or more power receiving side microgrids 100R are displayed side by side.

This allows users of the power transmitting microgrid 100T to easily understand the allocation of power to the transmission destinations in the self-transmission based on the display contents of the display device 200.

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

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

Figure 8 is a diagram showing a first operation example of the power management system 1 according to the second embodiment. Here, power is transmitted from one power transmitting microgrid 100T to two power receiving microgrids 100R1 and 100R2 by self-consignment.

In the example of Figure 8, during 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 during the target unit time.

During the target unit time, the receiving side microgrid 100R1 receives A [kWh] of power from the power grid 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].

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

The control unit 330 of the power management device 300 then causes the power transmitting side display device 200T to display the self-transmitted power amount in a manner that allows the distribution of the self-transmitted power amount from the power transmitting side microgrid 100T to the two power receiving side microgrids 100R1 and R2 to be identified. For example, the power transmitting side display device 200T displays a bar graph showing the self-transmitted power amount (X [kWh]) of the power transmitting side microgrid 100T alongside a bar graph stacking the self-transmitted power amounts (A [kWh] and B [kWh]) of the two power receiving side microgrids 100R1 and R2, respectively. In other words, the power transmitting side display device 200T displays a graph indicating that, of the self-transmitted power amount 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 device 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].

This display control allows users of the power transmitting microgrid 100T to easily understand the allocation of self-consignment power to the two power receiving microgrids 100R1 and R2 based on the display content of the power transmitting display device 200T.

Figure 9 is a diagram showing a second operation example of the power management system 1 according to the second embodiment. Here, power is transmitted from two power transmitting microgrids 100T1 and 100T2 to one power receiving microgrid 100R by self-consignment.

In the example of Figure 9, during 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 during the target unit time.

During 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 in accordance with 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 during the target unit time.

During the target unit time, the receiving side microgrid 100R receives Y [kWh] of power from the power grid 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].

The control unit 330 of the power management device 300 then causes the power receiving-side display device 200R to display the self-consigned power amount in a manner that allows the distribution of the self-consigned power amount 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 power amount (Y [kWh]) of the power receiving-side microgrid 100R alongside a bar graph stacking the self-consigned power amounts (C [kWh] and D [kWh]) of the two power transmitting-side microgrids 100T1 and 100T2. That is, the power receiving-side display device 200R displays a graph indicating that, of the self-consigned power amount 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 device 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].

This display control allows users on the power receiving side microgrid 100R to easily understand the allocation of self-transmitted power from the two power transmitting side microgrids 100T1 and T2 based on the display content of the power receiving side display device 200R.

The examples in Figures 8 and 9 are examples of displaying power data for a certain unit time, but as shown in Figures 10 and 11, power data for multiple consecutive unit times may also be displayed in chronological order.

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

Figure 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) through self-consignment. In the example shown in Figure 11, the display device 200 displays the power data of the receiving-side microgrid 100R in chronological order for each 30-minute unit time. Here, as in the first embodiment, an example is shown in which the receiving-side self-consignment power amount is displayed as "power generation amount." Specifically, the receiving-side self-consignment power amount is displayed separately as "power generation amount for other grid 1" and "power generation amount for other grid 2."

In this operation example, an example was described in which a stacked bar graph was used as a graph representing power data, but this is not limited to a stacked bar graph, and stacked line graphs, stacked area graphs, pie charts, etc. may also be used.

(3) Third Embodiment Next, a third embodiment will be described, focusing on 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.

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

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

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

Under such assumptions, the control unit 330 of the power management device 300 performs a power transmission enable/disable setting for each of the multiple microgrids 100, determining whether or not it is capable of operating as a power transmitting microgrid 100T, and a power receiving enable/disable setting for whether or not it is capable of operating as a power receiving microgrid 100R. This allows for 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.

The control unit 330 of the power management device 300 may set the power transmission and power reception availability for each of the multiple microgrids 100 for each time period. The time period may be an integer multiple of a unit time (e.g., 30 minutes).

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 "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 of 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 microgrids 100 that are not set as power transmission side microgrids 100T due to the power transmission enable/disable setting.

Furthermore, for a microgrid 100 that has been set as a power receiving microgrid 100R through the power receiving availability setting, the control unit 330 of the power management device 300 controls the display device 200 (power receiving display device 200R) to display power receiving 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 microgrid 100R) as "power generation amount," as in the first embodiment. When the microgrid 100 (power receiving microgrid 100R) receives power from two or more power transmitting microgrids 100T through 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 enables identification of the allocation of self-consigned power amounts from the two or more power transmitting microgrids 100T, 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 receiving side power data for microgrids 100 that are not set as the power receiving side microgrid 100R due to the power receiving availability setting.

Figure 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.

The management unit 320 of the power management device 300 manages the self-consignment group settings, including the power transmission availability settings and power reception availability settings for each of the microgrids 100a to 100c. The control unit 330 of the power management device 300 sets the power transmission availability and power reception availability for each of the microgrids 100a to 100c based on the self-consignment group settings.

In the example of Figure 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 power transmission side power data and power receiving side power data for the microgrid 100a.

Microgrid 100b is set to enable power transmission (ON) in self-consignment mode and disable power reception (OFF) in self-consignment mode. 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 microgrid 100b.

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 receiving-side power data for microgrid 100b.

In this way, according to the third embodiment, it is possible to set the power transmission and reception for self-consignment for each microgrid 100, making it possible to appropriately display only the power data required for each microgrid 100.

(4) Fourth Embodiment Next, a fourth embodiment will be described, focusing on 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.

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

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

This makes it possible to plan self-transfers that are most economically beneficial for the entity (microgrid administrator) to which each microgrid 100 belongs.

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

Figure 14 is a diagram showing an example of the operation of the power management system 1 according to the fourth embodiment. Here, we consider a case in which power can be transmitted from the power transmitting microgrid 100T to two power receiving microgrids 100R1 and 100R2 by self-consignment.

First, the management unit 320 of the power management device 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 Figure 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 the microgrid administrator.

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

(4.1) Modification of Fourth Embodiment Next, a modification 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. However, in this modification, the power transmission priority can be set more flexibly.

In this modified example, the control unit 330 of the power management device 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-dispatching. Specifically, the control unit 330 of the power management device 300 determines the power transmission priority using a determination method selected from multiple determination methods with different determination criteria for determining the power transmission priority. As a result, when transmitting power to multiple power receiving microgrids 100R by self-dispatching, it is possible to determine the priority of each power receiving microgrid 100R even if no priority is set in the dispatch settings for each power receiving microgrid 100R. Note that the control unit 330 of the power management device 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).

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

"Determination method a" is a method in which, if there is a microgrid among the candidate receiving microgrids that can cut peak power through wheeled 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 microgrids 100 that can cut peak power through self-wheeled power at least during the time period in which self-wheeling is performed.

"Determination method b" is a method in which, if there is a microgrid with chargeable storage equipment among the candidate receiving microgrids, priority is given to transmitting power to that microgrid. Here, charging is planned for the storage equipment in the receiving microgrid at the relevant time. "Determination method b" may also be a determination method in which priority is given to microgrids 100 that have storage batteries that can be charged with self-transferred power at least during the time period in which self-transfer is performed.

"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 receiving microgrids. "Determination method c" can reduce shortage imbalances in the receiving microgrid. "Determination method c" may also be a determination method of prioritizing a microgrid 100 whose supply-demand plan value reliability during at least the time period in which self-dispatching is performed is less than a predetermined value.

"Determination method d" is a method in which the electricity rate plans of candidate receiving microgrids are understood, and priority is given to transmitting electricity to the microgrid with the highest electricity unit price during the consignment time period. "Determination method d" may also be a determination method in which priority is given to the microgrid 100 with the highest electricity unit price (purchased electricity) from the power grid 10 at least during the time period in which self-consignment is performed.

Figure 15 is a diagram showing an example of the operation of the power management system 1 according to a modified example of the fourth embodiment. Here, we consider a case in which power can be transmitted from the power transmitting microgrid 100T to two power receiving microgrids 100R1 and 100R2 by self-consignment.

First, the management unit 320 of the power management device 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-consignment, in association with the determination order. In the example of Figure 15, the first determination method used is "Determination Method 1," and the second determination method used is "Determination Method 2." The settings of such determination methods may be determined by the microgrid administrator.

Second, the control unit 330 of the power management device 300 first determines the power transmission priority for the power receiving microgrids 100R1 and 100R2 using "Determination Method 1." If the power transmission priority cannot be determined using "Determination Method 1," the control unit 330 of the power management device 300 then determines the power transmission priority for the power receiving microgrids 100R1 and 100R2 using "Determination Method 2." Once the power transmission priority is determined in this manner, the control unit 330 of the power management device 300 sets the determined power transmission priority for each of the power receiving microgrids 100R1 and 100R2.

(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 terms of power transmission priority when 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.

In the above-described embodiment, an example configuration in which the display device 200 is located within the microgrid 100 has been described, 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.

A program may be provided that causes a computer to perform 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, but may be, for example, a CD-ROM or DVD-ROM. Furthermore, circuits that perform the operations according to the above-described embodiments may be integrated to form a semiconductor integrated circuit (chipset, SoC).

As used in this disclosure, the terms "include," "comprise," and variations thereof do not mean the inclusion of only the listed items, but may mean the inclusion of 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., 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 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 shall include the plural unless the context clearly indicates otherwise.

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 without departing from the spirit of the invention.

1: Power management system 10: Power system 20: Communication network 100: Microgrid 100T: Power transmitting side microgrid 100R: Power receiving side microgrid 101: Power line 102: Power receiving point 110: Distributed power source 120: Power load 200: Display device 200T: Power transmitting side display device 200R: Power receiving side display device 201: Bus 210: Communication unit 220: Display unit 230: Operation unit 240: Control unit 250: Memory unit 300: Power management device 301: Bus 310: Communication unit 311: Memory unit 320: Management unit 321: Memory unit 330: Control unit

Claims (10)

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,
When the control unit causes the display device to display the self-consigned amount of power for the power receiving grid, the control unit causes the display device to display the self-consigned amount of power as an amount of power generated by the power receiving grid. The power management system according to claim 1 , wherein, when an 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. 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 power is transmitted from one power transmitting grid to two or more power receiving grids through the self-consignment, the control unit displays the amount of self-consigned power on a display device in a manner that enables identification of allocation of the amount of self-consigned power to the two or more power receiving grids. 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 power is transmitted from two or more power transmitting grids to one power receiving grid through the self-transmission, the control unit displays the self-transmission amount of power on the display device in a manner that enables identification of distribution of the self-transmission amount of power from the two or more power transmitting grids. 5. The power management system according to claim 1, wherein the control unit performs a power transmission enable/disable setting for each of the plurality of grids, which determines whether the grid is enabled to operate as the power transmitting grid, and a power reception enable/disable setting for each of the plurality of grids, which determines whether the grid is enabled to operate as the power receiving grid. The power management system according to claim 1 , wherein 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. 5. The power management system according to claim 1, wherein the control unit determines, for each of the other grids, a power transmission priority when transmitting power from one grid to another grid through the self-dispatching, using a determination method selected from a plurality of determination methods having different determination criteria for determining the power transmission priority. 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,
When displaying the self-consigned power amount for the power receiving side grid, the display unit displays the self-consigned power amount as a generated power amount of the power receiving side grid. 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-consignment power amount for the power transmission side grid, displaying the self-consignment power amount as the power consumption amount of the power transmission side grid;
When the self-consigned power amount is displayed for the power receiving side grid, the self-consigned power amount is displayed as a power generation amount of the power receiving side grid. 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 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, the self-consigned power amount is regarded as a power consumption amount of the power transmission side grid and displayed on the display device;
When the self-consigned power amount is displayed for the power receiving side grid, the self-consigned power amount is regarded as the amount of power generated by the power receiving side grid and displayed on the display device.