Energy management device, energy management system, energy management method and energy management program

Abstract

To provide an energy management device capable of providing a stable supply of electricity even when fluctuations occur in the supply of electricity of a distributed energy resource in a power transmission and distribution network.SOLUTION: An energy management device includes: a communication unit which performs communications with a trunk energy resource management device that manages a trunk energy resource including a synchronous generator and communications with a plurality of distributed energy resources; and a control unit which, when power supplied to the power transmission and distribution network by the plurality of distributed energy resources is an output different from an operation plan, corrects the operation plan for supply power to the power transmission and distribution network of the trunk energy resource and each of the plurality of distributed energy resources based on synchronous generator information regarding the capacity of the synchronous generator in operation. The control unit performs notification regarding the corrected operation plan to the trunk energy resource management device and the plurality of distributed energy resources.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an energy management device, an energy management system, an energy management method, and an energy management program. [Background technology]

[0002] In recent years, a power supply system called a microgrid has been attracting attention (see Patent Document 1, etc.). A microgrid has distributed power sources, including renewable energy power generation, and can be configured to be energy self-sufficient within an area even when disconnected from the power transmission and distribution network. Therefore, it can be a power supply system that is resilient to disasters and other emergencies by efficiently utilizing renewable energy during normal times and operating independently from the power transmission and distribution network in emergencies. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-136757 Summary of the Invention [Problem to be solved by the invention]

[0004] The amount of power generated by distributed power sources connected to a power transmission and distribution network may differ from the amount of power generated in the operation plan, for example, if the weather does not turn out as forecasted for solar power generation or wind power generation.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide an energy management device, an energy management system, an energy management method, and an energy management program that can provide a stable power supply even when fluctuations occur in the power supply from distributed power sources in a power transmission and distribution network. [Means for solving the problem]

[0006] The energy management device of the present disclosure includes a communication unit that communicates with a core power source management device that manages a core power source having a synchronous generator and communicates with a plurality of distributed power sources, and a control unit that, when the power supplied by the plurality of distributed power sources to the power transmission and distribution network is an output that differs from the operation plan, modifies the operation plan for the power supply to the power transmission and distribution network of the core power source and each of the plurality of distributed power sources based on synchronous generator information regarding the capacity of the synchronous generator in operation, and the control unit is an energy management device that notifies the core power source management device and the plurality of distributed power sources of the modified operation plan.

[0007] The energy management system of the present disclosure includes a core power supply management device that manages a core power supply having a synchronous generator, a plurality of distributed power sources, and an energy management device that has a control unit that, when the power supplied by the plurality of distributed power sources to the power transmission and distribution network is an output that differs from the operation plan, corrects the operation plan for the power supplied to the power transmission and distribution network by the core power supply and each of the plurality of distributed power sources based on synchronous generator information regarding the capacity of the synchronous generators in operation, and the control unit of the energy management device notifies the core power supply management device and the plurality of distributed power sources of the corrected operation plan.

[0008] The energy management method disclosed herein is an energy management method in which, when the power supplied by multiple distributed power sources to a power transmission and distribution network is an output that differs from an operation plan, the operation plan for the power supply to the power transmission and distribution network of a main power source having a synchronous generator and each of the multiple distributed power sources is modified based on synchronous generator information regarding the capacity of the synchronous generator in operation, and the modified operation plan is notified to a main power source management device that manages the main power source and the multiple distributed power sources.

[0009] The energy management program disclosed herein is an energy management program that causes a computer to execute the following steps when the power that multiple distributed power sources supply to the power transmission and distribution network is an output that differs from the operation plan: modifying the operation plan for the power supply to the power transmission and distribution network of each of a main power source having a synchronous generator and the multiple distributed power sources based on synchronous generator information regarding the capacity of the synchronous generators in operation; and notifying a main power source management device that manages the main power source and the multiple distributed power sources of the modified operation plan. [Effects of the Invention]

[0010] According to the energy management device, energy management system, energy management method, and energy management program of the present disclosure, stable power supply can be achieved even when fluctuations occur in the power supply from distributed power sources in a power transmission and distribution network. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating a configuration example of an energy management system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram illustrating an example of a hardware configuration of an energy management device. [Figure 3] FIG. 1 is a diagram schematically illustrating an example of the configuration of a GFM power supply device. [Figure 4] FIG. 1 is a diagram illustrating a configuration example of a GFL power supply device. [Figure 5] FIG. 10 is a sequence diagram for explaining processing performed in an energy management system when it is detected that a distributed power source will produce an output different from that in an operation plan. [Figure 6] 10 is a flowchart illustrating an operation plan correction process. [Figure 7] 10 is a table showing processing when the amount of power generation is insufficient and the synchronous power generation rate is high. [Figure 8] 10 is a table showing processing when the amount of power generation is insufficient and the synchronous power generation rate is not high. [Figure 9]10 is a table showing processing when the amount of power generation is excessive and the synchronous power generation rate is high. [Figure 10] 10 is a table showing processing when the amount of power generation is excessive and the synchronous power generation rate is not high. [Figure 11] FIG. 10 is a diagram for explaining another example of the configuration of the energy management system. DETAILED DESCRIPTION OF THE INVENTION

[0012] An energy management device, an energy management system, an energy management method, and an energy management program according to embodiments of the present disclosure will be described with reference to the drawings. In the description, like elements are designated by like reference numerals, and duplicated descriptions will be omitted as appropriate.

[0013] 1 is a diagram illustrating an example configuration of an energy management system 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the energy management system 1 includes an energy management device 2, a main power source 3, a group of distributed power sources 4, a power transmission and distribution network 6, and a communication network 7.

[0014] FIG. 2 is a diagram illustrating an example of a hardware configuration of the energy management device 2. As illustrated in this diagram, the energy management device 2 includes a control unit 21 and a communication unit 22. The energy management device 2 may be a so-called information processing device configured mainly with electronic circuits using semiconductor circuit elements. For example, the control unit 21 may include a central processing unit (CPU) 211, a volatile storage unit 212 such as a random access memory (RAM), and a non-volatile storage unit 213 such as a flash memory or a hard disk. The communication unit 22 connects to a communication network 7 to perform communication. The energy management device 2 may be configured with multiple server devices or may have a similar configuration as a virtual server. The information processing performed by the control unit 21 and the communication performed by the communication unit 22 may be realized by the hardware illustrated in FIG. 2 operating in conjunction with programs and data stored in the volatile storage unit 212 and the non-volatile storage unit 213.

[0015] Here, the communication unit 22 can communicate with a trunk power management device 31 that manages the trunk power source 3, and with a plurality of distributed power sources including a GFM (Grid Forming) power supply device 41 and a GFL (Grid Following) power supply device 42. The control unit 21 can control the power supply to the power transmission and distribution network 6 of the trunk power source 3 and each of the plurality of distributed power sources via the communication unit 22. When the power output supplied by the plurality of distributed power sources to the power transmission and distribution network 6 differs from the operation plan, the control unit 21 may control the output ratio of the GFM power supply device 41 and the GFL power supply device 42 in accordance with the power generation ratio of the trunk power source 3 in the power transmission and distribution network 6. This makes it possible to suppress a decrease in inertia force and ensure a stable power supply even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6.

[0016] As described below, when the power output from the multiple distributed power sources to the power transmission and distribution network 6 differs from the operation plan, the control unit 21 can issue a notification to reduce the output rate of the GFM power supply unit 41 in the multiple distributed power sources when the power generation rate of the synchronous generator 32 in the power transmission and distribution network 6 is high. Furthermore, when the power generation rate of the synchronous generator 32 in the power transmission and distribution network 6 is not high, the control unit 21 can issue a notification to maintain or increase the output rate of the GFM power supply unit 41 in the multiple distributed power sources. The notification here can include information that will become the content of the updated operation plan. By taking such measures, when the power generation rate of the synchronous generator 32 is high, the power supply by the GFM power supply unit 41 can be maintained for a longer period. When the power generation rate of the synchronous generator 32 is low, the power supply amount of the GFM power supply unit 41 can be maintained or increased. Therefore, even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6, a decrease in inertia force can be suppressed, and a stable power supply can be achieved.

[0017] The communication unit 22 may also communicate with a power supply management device 31 that manages a power supply 3 having a synchronous generator 32, and with multiple distributed power sources. When the power output supplied by the multiple distributed power sources to the power transmission and distribution network 6 differs from the operation plan, the control unit 21 can modify the operation plans for the power supply to the power transmission and distribution network 6 of the power supply 3 and each of the multiple distributed power sources based on synchronous generator information related to the capacity of the synchronous generator 32 currently in operation. The control unit 21 can also notify the power supply management device 31 and the multiple distributed power sources of the modified operation plans. As a result, even when the power generated by the distributed power sources differs from the operation plan, the energy management device 2 can calculate the modified power generation amounts of the distributed power sources and the power supply 3 based on the operating status of the synchronous generator 32, and operate each power source appropriately. Therefore, a stable power supply can be achieved even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6. In the following description, for ease of reading, the processing, transmission / reception, and notification performed using the communication unit 22 of the control unit 21 may be simply referred to as transmission / reception or notification by the energy management device 2. In this disclosure, "a case where the output differs from the operation plan" includes a case where the output is predicted or estimated based on prior information or measurement values, or a case where the output differs based on information or measurement values ​​during operation. Here, the operation plan may be a plan for the amount of power generated by each power generation device so that there is no excess or shortage in power supply and demand, based on power demand forecasts, renewable energy power generation forecasts, the charge state of the power storage device, the capacity of each power generation device, etc. Furthermore, the operation plan may be changed as appropriate based on changes in the demand and supply situation.

[0018] Returning to FIG. 1 , the bulk power source 3 is composed of power supply devices that supply power to the power transmission and distribution network 6. In the sense that the output power can be adjusted, it is assumed that the bulk power source 3 mainly includes a power generation device that generates power using a synchronous generator 32, such as an internal combustion engine (thermal power). However, the synchronous generator 32 may include a generator that generates power by rotating a turbine using hydroelectric power, thermal power, nuclear power, or the like, in addition to an internal combustion engine. It may also include a power generation device that constitutes a distributed power source, as described below. In the present disclosure, the bulk power source 3 includes one or more synchronous generators 32 and a bulk power management device 31. The bulk power management device 31 can control the start and stop of each synchronous generator 32, as well as the increase and decrease of its output, via a communication line 34. It may also manage the overall power supplied to the power transmission and distribution network 6 and an operation plan related to the power supplied to the power transmission and distribution network 6. The bulk power management device 31 can control the synchronous generators 32 and the like based on the operation plan. The bulk power management device 31 may be configured as part of a so-called power distribution system. The hardware configuration of the core power supply management device 31 can be the same as that of the energy management device 2 described in Fig. 2, and a duplicated description will be omitted. Note that the core power supply 3 is not limited to this configuration, and may be configured to supply power to the power transmission and distribution network 6. Note that in the following description, instructions and notifications to the core power supply management device 31 may be expressed as instructions and notifications to the synchronous generator 32 to improve readability.

[0019] The distributed power generation group 4 includes distributed energy resources (DERs). The distributed power sources may be classified into either a GFM (Grid Forming) power supply device 41, which is a grid-forming type power supply device, or a GFL (Grid Following) power supply device 42, which is a grid-following type power supply device.

[0020] In this disclosure, the GFM power supply device 41 refers to a distributed power source inverter that supplies power and is a grid-forming inverter. A grid-forming inverter is an inverter that operates using a new inverter control method while providing inertial force like a synchronous generator. Therefore, the GFM power supply device 41 is a power source that can supply power while providing inertial force in a direction that maintains the grid frequency (for example, the frequency of the power transmission and distribution network 6), and therefore contributes to stabilizing the grid frequency. Note that the power transmission and distribution network 6 may or may not be a grid, but the GFM power supply device 41 may be able to provide inertial force to the frequency of the power transmission and distribution network 6.

[0021] In this disclosure, the GFL power supply device 42 refers to a distributed power source inverter that supplies power and is a grid-following inverter. A grid-following inverter operates by following the voltage on the grid side using a conventional inverter control method. Therefore, the GFL power supply device 42 can supply power at the grid frequency (e.g., the frequency of the power transmission and distribution network 6) when the grid frequency is stable. However, because the GFL power supply device 42 does not provide inertial force, it is a power source that does not contribute to stabilizing the grid frequency.

[0022] A load 45 is also connected to the power transmission and distribution network 6. The load 45 is a load that consumes power supplied from the main power source 3 and power supplied from the GFM power supply device 41 and the GFL power supply device 42, and may be, for example, a home or a business establishment.

[0023] 3 is a diagram schematically illustrating an example configuration of a GFM power supply device 41. As shown in this diagram, the GFM power supply device 41 can have a GFM control device 411, a power generation device 412, a GFM inverter 413, and a GFM switch 414.

[0024] The power generation device 412 may be a power generation device classified as a distributed power source. Distributed power sources are typically relatively small-scale power generation devices compared to power generation devices that constitute core power sources, and may include renewable energy power generation devices, fuel-power generation devices, and power storage devices (BT: Battery), etc. Here, renewable energy power generation devices may include power generation devices such as photovoltaic (PV) power generation, wind power generation, small hydroelectric power generation, biomass power generation, and geothermal power generation. Fuel-power generation devices may include power generation devices such as diesel engines (DG: Diesel Generators), gas engines, and gas turbines. Power storage devices may include household storage batteries, industrial storage batteries, and electric vehicle storage batteries. Furthermore, distributed power sources may include fuel cells and engines that use hydrogen. In the present disclosure, the power generation device 412 may include a renewable energy power generation device 4121 such as solar power generation, wind power generation, or small hydroelectric power generation, and a power storage device 4122.

[0025] The GFM inverter 413 can, for example, convert DC power generated by the power generation device 412 into AC power and output it. It also provides inertial force, contributing to stabilizing the frequency of the power transmission and distribution network 6. The GFM control device 411 controls the power output by the GFM inverter 413 and controls the connection between the output power line of the GFM inverter 413 and the power transmission and distribution network 6 using the GFM switch 414. The GFM control device 411 communicates with the energy management device 2 via the communication network 7. Through this communication, the GFM control device 411 can notify the energy management device 2 of the power generation status of the power generation device 412. Through this communication, the GFM control device 411 may also control the output of the GFM inverter 413 and the connection between the GFM inverter 413 and the power transmission and distribution network 6 using the GFM switch 414 based on the notification from the energy management device 2. The energy management device 2 may notify the GFM inverter 413 directly or via an information processing device other than the GFM control device 411. The hardware configuration of the GFM control device 411 can be the same as that of the energy management device 2 described in FIG. 2, and a duplicated description will be omitted.

[0026] 4 is a diagram schematically illustrating an example of the configuration of the GFL power supply device 42. As shown in this diagram, the GFL power supply device 42 can include a GFL control device 421, a power generation device 422, a GFL inverter 423, and a GFL switch 424.

[0027] As with the power generation device 412, the power generation device 422 may be a power generation device classified as a distributed power source. Specific examples of the distributed power source are as described above, and redundant explanations will be omitted. The power generation device 422 may also include a renewable energy power generation device 4221, such as a solar power generation device, a wind power generation device, or a small hydroelectric power generation device, and a power storage device 4222.

[0028] The GFL inverter 423 can, for example, convert DC power generated by the power generation device 422 into AC power and output it. However, because it does not provide inertial force, it does not contribute to stabilizing the frequency of the power transmission and distribution network 6. The GFL control device 421 controls the output power of the GFL inverter 423 and also controls the connection between the output power line of the GFL inverter 423 and the power transmission and distribution network 6 via the GFL switch 424. The GFL control device 421 communicates with the energy management device 2 via the communication network 7. Through this communication, the GFL control device 421 can notify the energy management device 2 of the power generation status of the power generation device 422. Furthermore, through this communication, the GFL control device 421 may control the output of the GFL inverter 423 and control the connection between the GFL inverter 423 and the power transmission and distribution network 6 via the GFL switch 424 based on the notification from the energy management device 2. Note that the energy management device 2 may notify the GFL inverter 423 directly or via an information processing device other than the GFL control device 421. The hardware configuration of the GFL control device 421 can be the same as that of the energy management device 2 described in FIG. 2, and a duplicated description will be omitted.

[0029] FIG. 5 is a sequence diagram illustrating processing S100 performed when the energy management system 1 according to the present disclosure detects that a distributed power source will produce an output different from that specified in the operation plan. As shown in this sequence diagram, the energy management device 2 detects in step S101 that the output will differ from that specified in the operation plan. The output may differ from that specified in the operation plan, for example, if the amount of solar radiation irradiating a solar power generation panel constituting the distributed power source differs from the amount of solar radiation assumed based on a weather forecast or the like at the time the operation plan was created. Also, for example, the wind speed blowing on the wind turbine of a wind power generation device constituting the distributed power source differs from the wind speed assumed in a weather forecast or the like at the time the operation plan was created. Also, for example, a small hydroelectric power generation device constituting the distributed power source may produce an output different from that specified in the operation plan based on the water volume of a dam and a weather forecast. The energy management device 2 may detect this by receiving a notification from the distributed power source group 4 that the output will differ from that specified in the operation plan. The energy management device 2 may also detect this by acquiring information such as the latest weather forecast and determining that the output will differ from that specified in the operation plan based on the acquired information, or by other methods.

[0030] Next, in step S102, the energy management device 2 inquires about synchronous generator information from the core power management device 31, and in step S103, acquires the synchronous generator information from the core power management device 31. Here, the synchronous generator information may include synchronous generator information related to the capacity of the synchronous generator 32 currently in operation. Examples of the information related to capacity include the upper and lower limits of the supplied power, the current output power, and the output variable slew rate (upper and lower limits of the output change rate). Upon receiving the synchronous generator information, the energy management device 2 performs an operation plan correction process S200.

[0031] FIG. 6 is a flowchart showing the operation plan correction process S200. As shown in this flowchart, in the operation plan correction process S200, first, in step S201, it is determined whether the output of the distributed power sources will be smaller or larger than the operation plan. If the output will be smaller than the operation plan (step S201: smaller), it is determined in step S202 whether the proportion of synchronous generators 32 with respect to the total power generation amount in the power transmission and distribution network 6 is high. Here, a high proportion of synchronous generators 32 can be defined as a predetermined value of 60 to 90%, for example. The predetermined value may be determined in advance taking into account the number of operating synchronous generators 32, the type and number of distributed power sources, etc. Furthermore, the proportion of synchronous generators 32 may be determined based on the amount of power generation after the amount of power generation deviates from the operation plan, or based on the amount of power generation before the amount of power generation deviates from the operation plan.

[0032] If it is determined that the proportion of the synchronous generator 32 relative to the total power generation amount is high (step S202: Yes), processing for the case where the power generation amount is insufficient and the synchronous generation rate is high is performed in step S203. Processing for the case where the power generation amount is insufficient and the synchronous generation rate is high will be described later using the table of FIG. 7. If it is not determined that the proportion of the synchronous generator 32 relative to the total power generation amount is high (step S202: No), processing for the case where the power generation amount is insufficient and the synchronous generation rate is medium or low is performed in step S204. Processing for the case where the power generation amount is insufficient and the synchronous generation rate is medium or low will be described later using the table of FIG. 8. In the present disclosure, the synchronous generation rate means the proportion of the power or amount of power supplied by the synchronous generator to the power transmission and distribution network 6. However, it may also be the proportion of the power or amount of power supplied by the synchronous generator and the GFM power supply device 41 combined to the power or amount of power supplied to the power transmission and distribution network 6. Alternatively, it may be the proportion obtained by subtracting the proportion of the power or amount of power provided by the GFL power supply device 42 from the power or amount of power supplied to the power transmission and distribution network 6. Alternatively, the synchronous generation rate may be the rate obtained by subtracting the rate of the power or amount of power provided by the distributed power sources (GFM power supply devices 41 and GFL power supply devices 42) from the power or amount of power supplied to the power transmission and distribution network 6. Alternatively, the synchronous generation rate may be a value that serves as an index representing the magnitude of the inertial force of the AC power frequency in the power transmission and distribution network 6. In this disclosure, the "synchronous generation rate" may also be expressed as the "power generation rate of the synchronous generator," which has the same meaning. A high synchronous generation rate may be, for example, a rate of 40% or more, 50% or more, or 60% or more. A low synchronous generation rate may be, for example, a rate of 60% or less, 50% or less, or 40% or less.

[0033] FIG. 7 is a table showing the processing when power generation is insufficient and the synchronous power generation rate is high. The table in FIG. 7 shows the content of notifications to the synchronous generator 32 (core power management device 31), the GFM power supply unit 41, and the GFL power supply unit 42 when modifying the operation plan. This notification can be used as a modified operation plan. Specifically, the table shows the content set (notified) in the notification to the synchronous generator 32, the notification to the GFM power supply unit 41, and the notification to the GFL power supply unit 42 for each of three cases: when the output of the synchronous generator 32 is near its upper output limit, when the output of the synchronous generator 32 is medium, and when the output of the synchronous generator 32 is near its lower output limit. In addition, the rightmost column shows a comparison of the period until the distributed power sources (GFM power supply unit 41 and GFL power supply unit 42) that shut down due to insufficient power generation shut down.

[0034] When the synchronous generator output is near its upper limit (the top row in the table in Figure 7), the output of the synchronous generator 32 cannot be increased immediately, so the number of operating synchronous generators 32 is increased. Furthermore, since the output of the synchronous generator 32 cannot be increased immediately, it is necessary to maintain the output of the distributed power sources. In this case, however, the amount of discharge from the battery devices 4122 and 4222 increases, shortening the time until the distributed power sources (GFM power supply units 41 and GFL power supply units 42) are shut down, and a short-term shutdown (e.g., one hour after shutdown) is set. On the other hand, since the synchronous generation rate is high and the inertial force is high, the output of the GFM power supply units 41, which provide the inertial force, is reduced so that the GFM power supply units 41 can be used for a longer period. Furthermore, the output of the GFL power supply units 42 is increased by the amount that the output of the GFM power supply units 41 is reduced. This allows the output of the GFM power supply units 41, which provide the inertial force, to be maintained for a longer period while maintaining the output of the distributed power sources. When the number of operating synchronous generators 32 increases, the output of the GFM power supply units 41 and GFL power supply units 42 can be stopped.

[0035] In this way, when the energy management device 2 cannot increase the power generation capacity of the operating synchronous generators 32 to a level equal to or greater than the power generation capacity in the operation plan for the multiple distributed power sources, it can issue a notification to reduce the output of the GFM power supply unit 41, and then issue a notification to stop the multiple distributed power sources and increase the number of operating synchronous generators 32. This makes it possible to suppress a decrease in inertia in the power supply and ensure a stable power supply, even when the power generation output of the multiple distributed power sources is smaller than the operation plan and cannot be covered by increasing the power generation output of the operating synchronous generators 32. In the present disclosure, "when the power generation capacity of the multiple distributed power sources cannot be increased to a level equal to or greater than the power generation capacity in the operation plan" includes cases where it is predicted / estimated that this will not be possible.

[0036] When the synchronous generator output is at a moderate level with room for both increase and decrease (the second row in the table in Figure 7), the output of the synchronous generator 32 can be increased. At this time, if the increase in the output of the synchronous generator 32 cannot exceed the power generation amount specified in the operation plan of the GFM power supply unit 41 and the GFL power supply unit 42, the number of operating synchronous generators 32 is increased. The output of the distributed power source can be reduced by the amount of increase in the output of the synchronous generator 32. In this case, the discharge amount of the battery storage devices 4122 and 4222 can be reduced compared to when the synchronous generator output is near its upper limit. Therefore, the period until the shutdown of the distributed power source (GFM power supply unit 41 and GFL power supply unit 42) can be set longer (for example, two hours). On the other hand, because the synchronous generation rate is high and the inertia force is strong, the output of the GFM power supply unit 41, which provides the inertia force, can be used for a longer period. When the number of operating synchronous generators 32 increases, the output of the GFM power supply unit 41 and the GFL power supply unit 42 can be stopped.

[0037] In this way, when the amount of power generated by the operating synchronous generators 32 cannot be increased to be equal to or greater than the amount of power generated in the operation plan for the multiple distributed power sources, the energy management device 2 can issue a notification to reduce the output of the GFM power supply device 41 and a notification to increase the number of operating synchronous generators 32. As a result, even when the power generation output of the multiple distributed power sources becomes smaller than the operation plan and cannot be covered by increasing the power generation output of the operating synchronous generators 32, it is possible to suppress a decrease in inertia in the power supply and provide a stable power supply.

[0038] When the synchronous generator output is near its lower limit (the bottom row in the table in Figure 7), the output of the synchronous generator 32 can be increased sufficiently. Here, the output of the distributed power source can be reduced by the amount that the output of the synchronous generator 32 can be increased, so the discharge amount of the power storage devices 4122 and 4222 can be reduced compared to when the synchronous generator output is medium as described above. For this reason, the period until the distributed power source is stopped can be set longer (for example, three hours later). On the other hand, because the synchronous power generation rate is high and the inertial force is large, the output of the GFM power supply device 41, which provides the inertial force, is set to be reduced so that the GFM power supply device 41, which provides the inertial force, can be used for a longer period.

[0039] In this way, when the amount of power generated by the operating synchronous generator 32 can be increased to or above the amount of power generated in the operation plan for the multiple distributed power sources, the energy management device 2 can notify the user to reduce the output of the GFM power supply unit 41 and notify the user to increase the amount of power generated by the synchronous generator 32. This makes it possible to suppress a decrease in inertial force in the power supply and provide a stable power supply even when the power generation output of the multiple distributed power sources is lower than the operation plan. In the present disclosure, "when the amount of power generated by the multiple distributed power sources can be increased to or above the amount of power generated in the operation plan" includes cases where it is predicted / estimated that this is possible.

[0040] As shown in the table of FIG. 7 , when the output is lower than the operation plan and the power generation rate of the synchronous generator 32 is high, a notification to reduce the output of the GFM power supply unit 41 can be issued as a notification to lower the output rate of the GFM power supply unit 41. Examples of output that is lower than the operation plan include cases where the amount of power generated by renewable energy power generation is lower than the operation plan, such as when the amount of solar radiation is lower than the weather forecast for the previous day and the amount of power generated by solar power generation is lower. By taking such measures, when the power generation rate of the synchronous generator 32 is high, the power supply by the GFM power supply unit 41 can be maintained for a longer period of time. Therefore, even when fluctuations occur in the power supply from distributed power sources in the power transmission and distribution network 6, a decrease in inertia force can be suppressed, and a stable power supply can be achieved.

[0041] FIG. 8 is a table showing the processing when the synchronous generation rate is not high due to insufficient power generation (medium-low synchronous generation rate). The table configuration is the same as that shown in FIG. 7. In this case, when the synchronous generator output is near its upper limit (the top row of the table in FIG. 8), the output of the synchronous generator 32 cannot be increased immediately, so the number of operating synchronous generators 32 is increased. Furthermore, since the output of the synchronous generator 32 cannot be increased immediately, the output of the distributed power sources must be maintained. In this case, however, the amount of discharge from the battery storage devices 4122 and 4222 increases, shortening the period until the distributed power sources are shut down, and a short shutdown time (e.g., one hour after shutdown) is set. On the other hand, since the synchronous generation rate is not high, the output of the GFM power supply unit 41, which provides inertial force, is increased to maintain the inertial force, and the output of the GFL power supply unit 42 is reduced accordingly. This allows the GFM power supply unit 41, which provides inertial force, to output power while maintaining the output of the distributed power sources. When the number of operating synchronous generators 32 increases, the output of the GFM power supply unit 41 and the GFL power supply unit 42 can be stopped.

[0042] In this way, when the energy management device 2 cannot increase the power generation amount of the operating synchronous generators 32 to be equal to or greater than the power generation amount in the operation plan for the multiple distributed power sources, it notifies the GFL power supply device 42 to decrease the output and also notifies the GFL power supply device 42 to increase the number of operating synchronous generators 32. As a result, even when the power generation output of the multiple distributed power sources is smaller than the operation plan and cannot be covered by increasing the power generation output of the operating synchronous generators 32, it is possible to suppress a decrease in inertia in the power supply and ensure a stable power supply.

[0043] When the synchronous generator output is at a moderate level (the second row in the table in Figure 8), with room for both increase and decrease, the output of the synchronous generator 32 can be increased. In this case, if the increase in the output of the synchronous generator 32 cannot exceed the power generation capacity of the GFM power supply unit 41 and the GFL power supply unit 42 in the operation plan, the number of operating synchronous generators 32 is increased. The output of the distributed power sources can be reduced by the amount of increase in the output of the synchronous generator 32. In this case, the discharge amount of the battery storage devices 4122 and 4222 can be reduced compared to when the synchronous generator output is near its upper limit, so the period until the distributed power sources are shut down can be set longer (for example, two hours). On the other hand, because the synchronous power generation rate is not high, the output of the GFM power supply unit 41, which provides inertial force, can be maintained, and the output of the GFL power supply unit 42 can be reduced, thereby lowering the output of the distributed power sources. This allows output without reducing the proportion of the output of the GFM power supply unit 41, which provides inertial force. When the number of operating synchronous generators increases, the output of the GFM power supply unit 41 and the GFL power supply unit 42 can be shut down.

[0044] In this way, when the energy management device 2 cannot increase the power generation amount of the operating synchronous generators 32 to be equal to or greater than the power generation amount in the operation plan for the multiple distributed power sources, it notifies the GFL power supply device 42 to decrease the output and also notifies the GFL power supply device 42 to increase the number of operating synchronous generators 32. As a result, even when the power generation output of the multiple distributed power sources is smaller than the operation plan and cannot be covered by increasing the power generation output of the operating synchronous generators 32, it is possible to suppress a decrease in inertia in the power supply and ensure a stable power supply.

[0045] When the synchronous generator output is near its lower limit (the bottom row in the table in Figure 8), the output of the synchronous generator 32 can be increased sufficiently. Here, the output of the distributed power sources can be reduced by the amount of the increased output of the synchronous generator 32. Therefore, the discharge amount of the battery devices 4122 and 4222 can be reduced compared to when the synchronous generator output is moderate. Therefore, the period until the distributed power sources are shut down can be set longer (for example, three hours). On the other hand, because the synchronous power generation rate is not high, the output of the GFM power supply 41, which provides inertial force, can be maintained, and the output of the GFL power supply 42 can be reduced, thereby lowering the output of the distributed power sources. This allows output without reducing the proportion of the output of the GFM power supply 41, which provides inertial force. As the output of the synchronous generator 32 increases, the output of the GFM power supply 41 and the GFL power supply 42 can be stopped.

[0046] In this way, when the energy management device 2 can increase the power generation amount of the operating synchronous generator 32 to or above the power generation amount in the operation plan of the multiple distributed power sources, it can notify the user to reduce the output of the GFL power supply device 42 and also notify the user to increase the power generation amount of the synchronous generator 32. This makes it possible to suppress a decrease in inertial force in the power supply and provide a stable power supply even if the power generation output of the multiple distributed power sources is lower than the operation plan.

[0047] As shown in the table in FIG. 8 , when the output is lower than the operation plan and the power generation rate of the synchronous generator 32 is not high, a notification to maintain or increase the output rate of the GFM power supply unit 41, i.e., a notification to decrease the output of the GFL power supply unit 42, can be issued. Here, the output rate of the GFM power supply unit 41 refers to the output rate of the GFM power supply unit 41 relative to the total output of the GFM power supply unit 41 and the GFL power supply unit 42. Examples of output that is lower than the operation plan include cases where the amount of solar radiation is lower than the weather forecast for the previous day, resulting in less power generation from solar power generation and thus less power generation from renewable energy sources than the operation plan. By taking such measures, the power supply rate of the GFM power supply unit 41 can be maintained when the power generation rate of the synchronous generator 32 is low. Therefore, even when fluctuations occur in the power supply from distributed power sources in the power transmission and distribution network 6, a decrease in inertia force can be suppressed, ensuring a stable power supply.

[0048] As described above, when the output of the multiple distributed power sources becomes lower than the operation plan (notification to reduce output), the energy management device 2 can change the output of the multiple distributed power sources and then set the multiple distributed power sources to be shut down. Here, the period until the shutdown of the multiple distributed power sources, i.e., the GFM power supply unit 41 and the GFL power supply unit 42, can be determined based on the amount of remaining power generation from the current power generation amount of the synchronous generator 32 up to the upper limit of the power generation amount of the synchronous generator 32 currently in operation. Specifically, for example, in FIGS. 7 and 8 , when the synchronous generator output is near the upper limit, the amount of remaining power generation may be determined to be small, and when the synchronous generator output is near the lower limit, the amount of remaining power generation may be determined to be large. When the amount of remaining power generation is large, the energy management device 2 can reduce the dependency on the power generation amount of the dispersed power source to be shut down, and can therefore notify the user to extend the period until the shutdown. In other words, the energy management device 2 may determine the amount of power generation until the shutdown of the dispersed power sources and the amount of power generation until the shutdown of each of the GFM power supply unit 41 and the GFM power supply unit 42 based on the amount of remaining power generation. In this case, if there is excess power generation capacity, the power generation capacity of the distributed power source can be reduced and the power generation capacity of the distributed power source can be used for a longer period of time, so that the power supply source can be switched from the distributed power source to the synchronous generator 32 while maintaining a stable power supply.

[0049] Returning to FIG. 6 , if the output of the distributed power sources is greater than the operation plan in step S201 of the operation plan correction process S200 (step S201: greater), it is determined in step 205 whether the proportion of synchronous generators 32 relative to the total power generation amount in the power transmission and distribution network 6 is high. Here, a high proportion of synchronous generators 32 can be defined as a predetermined value of, for example, 60 to 90%, as in the case where the proportion is small in step S201 described above. The predetermined value may be determined in advance taking into consideration the number of operating synchronous generators 32, the type and number of distributed power sources, etc. Furthermore, the proportion of synchronous generators 32 may be determined based on the amount of power generation after the amount of power generation deviates from the operation plan, or may be determined based on the amount of power generation before the amount of power generation deviates from the operation plan.

[0050] If it is determined that the proportion of the synchronous generators 32 relative to the total power generation amount is high (step S205: Yes), then in step S206, processing is performed for the case where power generation is excessive and the synchronous power generation rate is high. Processing for the case where power generation is excessive and the synchronous power generation rate is high will be explained later using the table in FIG. 9. If it is not determined that the proportion of the synchronous generators 32 relative to the total power generation amount is high (step S205: No), then in step S207, processing is performed for the case where power generation is excessive and the synchronous power generation rate is medium or low. Processing for the case where power generation is insufficient and the synchronous power generation rate is medium or low will be explained later using the table in FIG. 10.

[0051] FIG. 9 is a table showing the processing when power generation is excessive and the synchronous generation rate is high. The table is structured similarly to FIG. 7, but because the distributed power sources are not shut down, there is no column corresponding to the rightmost column in FIG. 7. When the synchronous generator output is near its upper limit (top row in the table in FIG. 9), the output of the synchronous generator 32 can be sufficiently reduced, allowing the distributed power source with excessive power generation to increase its output. Here, because the synchronous generation rate is high and the inertia is high, the output of the GFM power supply unit 41, which provides inertia, is maintained, and the output of the GFL power supply unit 42, which does not have inertia, is increased, thereby ensuring the output of the GFM power supply unit 41, which has high inertia. Here, when the synchronous generator output is at a moderate level with room to both increase and decrease (second row in the table in FIG. 9), the operation is similar to the operation when the synchronous generator output is near its upper limit, so a redundant explanation will be omitted.

[0052] In this way, when the output that differs from the operation plan is greater than the operation plan and the power generation rate of the synchronous generator 32 in the power transmission and distribution network 6 is high, a notification to increase the output of the GFL power supply 42 can be sent as a notification to decrease the output rate of the GFM power supply 41. Examples of output that is greater than the operation plan include cases where the amount of power generated by renewable energy power generation is greater than the operation plan, such as when the amount of solar radiation is greater than the weather forecast for the previous day and the amount of power generated by solar power generation is higher. By taking such measures, when the power generation rate of the synchronous generator 32 is high, the proportion of power supplied by the GFM power supply 41 can be ensured. When the power generation rate of the synchronous generator 32 is low, the amount of power supplied by the GFM power supply 41 can be increased. Therefore, even when fluctuations occur in the power supply from distributed power sources in the power transmission and distribution network 6, a decrease in inertia force can be suppressed and a stable power supply can be achieved.

[0053] In this way, when the energy management device 2 can reduce the power generation amount of the operating synchronous generator 32 to an amount exceeding the power generation amount in the operation plan of the GFM power supply device 41 and the GFL power supply device 42, the energy management device 2 can notify the reduction in the power generation amount of the synchronous generator 32. As a result, even if the power generation output of a plurality of distributed power sources becomes greater than the operation plan, the inertial force in the power supply can be maintained, and a stable power supply can be achieved.

[0054] When the synchronous generator output is near the lower limit (the bottom row of the table in FIG. 9), it is not possible to immediately reduce the output of the synchronous generator 32. For this reason, if the power storage devices 4122 and 4222 of the distributed power sources can be charged, they are charged to reduce the output, or if the charge state is close to full charge, the output of some of the distributed power sources is stopped.

[0055] In this way, the energy management device 2 can issue a notification to reduce the power generation amounts of the multiple distributed power sources when it is not possible to reduce the power generation amount of the operating synchronous generator 32 by an amount that exceeds the power generation amounts in the operation plan of the GFM power supply device 41 and the GFL power supply device 42. This makes it possible to maintain the inertial force in the power supply and ensure a stable power supply, even when the power generation output of the multiple distributed power sources exceeds the operation plan.

[0056] FIG. 10 is a table showing the processing when power generation is excessive and the synchronous generation rate is not high (medium-low synchronous generation rate). The table configuration is the same as that shown in FIG. 7. When the synchronous generator output is near its upper limit (top row of the table in FIG. 10), the output of the synchronous generator 32 can be sufficiently reduced, allowing the distributed power source with excessive power generation to increase its output. Here, the synchronous generation rate is not high and the inertial force is low, so the inertial force can be kept high by increasing the output of the GFM power supply unit 41, which provides the inertial force. Here, the operation when the synchronous generator output is at a medium level with room to both increase and decrease (second row of the table in FIG. 10) is similar to the operation when the synchronous generator output is near its upper limit, so a redundant explanation will be omitted.

[0057] In this way, when the output that differs from the operation plan is greater than the operation plan and the power generation rate of the synchronous generator 32 in the power transmission and distribution network 6 is not high, a notification to increase the output of the GFM power supply unit 41 can be sent to maintain or increase the output rate of the GFM power supply unit 41. Examples of output that is greater than the operation plan include cases where the amount of power generated by renewable energy power generation is greater than the operation plan, such as when the amount of solar radiation is greater than the weather forecast for the previous day and the amount of power generated by solar power generation is higher. By taking such measures, the power supply amount of the GFM power supply unit 41 can be increased when the power generation rate of the synchronous generator 32 is low. Therefore, even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6, a decrease in inertia force can be suppressed and a stable power supply can be achieved.

[0058] When the energy management device 2 can reduce the power generation amount of the operating synchronous generator 32 to an amount exceeding the power generation amount in the operation plan of the GFM power supply device 41 and the GFL power supply device 42 or more, it can notify the reduction in the power generation amount of the synchronous generator 32. As a result, even if the power generation output of a plurality of distributed power sources becomes larger than the operation plan, it is possible to maintain the inertial force in the power supply and to provide a stable power supply.

[0059] When the synchronous generator output is near the lower limit (the bottom row of the table in FIG. 10), it is not possible to immediately reduce the output of the synchronous generator 32. For this reason, if the power storage devices 4122 and 4222 of the distributed power sources can be charged, they are charged to reduce the output, or if the charge state is close to full charge, the output of some of the distributed power sources is stopped.

[0060] The energy management device 2 issues a notification to reduce the power generation amounts of the multiple distributed power sources when it is unable to reduce the power generation amount of the operating synchronous generator 32 by an amount exceeding the power generation amounts in the operation plan of the GFM power supply device 41 and the GFL power supply device 42. This makes it possible to maintain the inertial force in the power supply and ensure a stable power supply even when the power generation output of the multiple distributed power sources exceeds the operation plan.

[0061] In this way, for example, as shown in the tables of Figures 7 and 9, when the power supplied by multiple distributed power sources to the power transmission and distribution network 6 is an output that differs from the operation plan, and when the power generation rate of the synchronous generator 32 in the power transmission and distribution network 6 is high, a notification can be issued to reduce the output rate of the GFM power supply unit 41 in the multiple distributed power sources. Here, the output rate of the GFM power supply unit 41 means the output rate of the GFM power supply unit 41 relative to the total output of the GFM power supply unit 41 and the GFL power supply unit 42. By taking such measures, the power supply by the GFM power supply unit 41 can be maintained for a longer period of time.

[0062] Furthermore, as shown in the tables of Figures 8 and 10, for example, when the power supplied from multiple distributed power sources to the power transmission and distribution network 6 differs from the operation plan, and when the power generation ratio of the synchronous generator 32 in the power transmission and distribution network 6 is not high, a notification can be issued to maintain or increase the output ratio of the GFM power supply unit 41 in the multiple distributed power sources. Here, the output ratio of the GFM power supply unit 41 means the output ratio of the GFM power supply unit 41 to the total output of the GFM power supply unit 41 and the GFL power supply unit 42. By taking such measures, the amount of power supply from the GFM power supply unit 41 can be maintained or increased. Therefore, even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6, a decrease in inertia force can be suppressed, and a stable power supply can be achieved.

[0063] Returning to FIG. 5 , when the operation plan correction process S200 is completed, the energy management device 2 notifies the core power supply management device 31 of the corrected operation plan in step S105. Here, the contents of the operation plan to be notified can include at least one of information about the number of operating synchronous generators 32, information about the operation start time of a new synchronous generator 32 that will start operation, information about the output change time of an operating synchronous generator 32 that will have its output changed, the output of the distributed power source after the output change, the output ratio of the GFM power supply unit 41 / GFL power supply unit 42, the slew rate of the distributed power source, and the capabilities of the GFM power supply unit 41 (inertia force, synchronizing force, frequency adjustment capability). This allows the energy management device 2 to notify the management device of the core power supply 3 of the corrected operation plan, thereby enabling a stable power supply in cooperation with the synchronous generators 32.

[0064] The energy management device 2 that has notified the modified operation plan can control the distributed power sources based on the modified operation plan in step S108. Furthermore, the core power management device 31 that has notified the modified operation plan can control the distributed power sources based on the modified operation plan in step S107.

[0065] Furthermore, when the core power management device 31 determines whether to implement the modified operation plan notified by the energy management device 2 in accordance with the plan, it may issue a notification of confirmation of implementation of the operation plan regarding whether to implement the modified operation plan in step S106. When there is a notification of confirmation of implementation of the operation plan, the energy management device 2 can issue a notification of a change in output power for the multiple distributed power sources based on the notification of confirmation of implementation of the operation plan from the core power management device 31 (step S106) after issuing a notification regarding the modified operation plan in step S105. As a result, even when the core power management device 31 manages the operation plan of the power transmission and distribution network 6, it can operate the distributed power sources and the core power source 3 connected to the power transmission and distribution network 6 based on the operation plan modified by the energy management device 2.

[0066] 5 , before notifying the energy management device 2 of the revised operation plan, the energy management device 2 receives synchronous generator information related to the capacity of the synchronous generators 32 in operation from the management device of the main power source 3. This allows the energy management device 2 to calculate revised power generation amounts in the distributed power sources connected to the power transmission and distribution network 6 and the main power source 3 based on the latest operational status of the synchronous generators 32.

[0067] In the above description, the energy management device 2 communicates directly with the GFM power supply devices 41 and the GFL power supply devices 42. However, as shown in FIG. 11 , the energy management device 2 may be configured to indirectly control the GFM power supply devices 41 and the GFL power supply devices 42 by communicating with other distributed power management devices 43A and 43B that control the GFM power supply devices 41 and the GFL power supply devices 42. The communication networks 46A and 46B that connect the distributed power management devices 43A and 43B to the GFM power supply devices 41 and the GFL power supply devices 42 that they manage may be networks using dedicated lines or public networks such as the Internet. The distributed power management devices 43A and 43B may be server devices such as cloud servers connected to the Internet as long as they can communicate with the respective GFM control devices 411 and GFL control devices 421. The distributed power management devices 43A and 43B may be configured as devices referred to as distributed energy resource management systems (DERMS). The group of distributed power sources 4 may be an area having one or more power systems that integrate power supply and power consumption within the area. The group of distributed power sources 4 may also be a microgrid or a regional independent system. However, the group of distributed power sources 4 is not limited to this configuration, and may be configured to have at least one distributed power source that can be connected to the power transmission and distribution network 6 and a control device that controls the distributed power source directly or indirectly connected to the communication network 7.

[0068] As described above, when the power output supplied from the multiple distributed power sources to the power transmission and distribution network 6 differs from the operation plan, the energy management device 2 may control the output ratio of the GFM power supply device 41 and the GFL power supply device 42 according to the power generation ratio of the bulk power source 3 in the power transmission and distribution network 6. This makes it possible to suppress a decrease in inertia force and provide a stable power supply even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6. Furthermore, when the power output supplied from the multiple distributed power sources to the power transmission and distribution network 6 differs from the operation plan, the energy management device 2 can issue a notification to reduce the output ratio of the GFM power supply device 41 in the multiple distributed power sources when the power generation ratio of the synchronous generator 32 in the power transmission and distribution network 6 is high. Furthermore, when the power generation ratio of the synchronous generator 32 in the power transmission and distribution network 6 is not high, the energy management device 2 can issue a notification to maintain or increase the output ratio of the GFM power supply device 41 in the multiple distributed power sources. By taking such measures, the power supply by the GFM power supply device 41 can be maintained for a longer period when the power generation ratio of the synchronous generator 32 is high. When the power generation rate of the synchronous generator 32 is low, the amount of power supplied by the GFM power supply device 41 can be maintained or increased. Therefore, even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6, a decrease in inertial force can be suppressed, and stable power supply can be achieved.

[0069] Furthermore, as described above, when the power supplied from the multiple distributed power sources to the power transmission and distribution network 6 differs from the output in the operation plan, the energy management device 2 can modify the operation plans for the power supply to the power grid 3 and each of the multiple distributed power sources based on synchronous generator information related to the capacity of the synchronous generators 32 in operation. Furthermore, the energy management device 2 can notify the multiple distributed power sources of the modified operation plans. As a result, even when the power generated by the distributed power sources differs from the operation plan, the energy management device 2 can calculate the modified power generation amounts of the distributed power sources and the power grid 3 based on the operating status of the synchronous generators 32, and operate each power source appropriately. As a result, a stable power supply can be achieved even when fluctuations occur in the power supply from the distributed power sources in the power transmission and distribution network 6.

[0070] The operational flows and operational examples in the above-described embodiments do not necessarily have to be executed in chronological order according to the order depicted in the flow diagrams or sequence diagrams. For example, steps in the operations may be executed in an order different from that depicted in the flow diagrams or sequence diagrams, or may be executed in parallel. Some steps in the operations may be deleted, or additional steps may be added to the processing. The operational flows and operational examples in the above-described embodiments may be executed independently, or two or more operational flows and operational examples may be combined and executed. For example, some steps in one operational flow may be added to another operational flow, or some steps in one operational flow may be replaced with some steps in another operational flow.

[0071] A program may be provided that causes a computer to execute the operations according to the above-described embodiments. The program may be recorded on a computer-readable medium. The computer-readable medium can be used to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

[0072] As used in this disclosure, the terms "based on" and "depending on" do not mean "based only on" or "depending 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 "depending on" means both "depending only on" and "depending at least in part on." Furthermore, the terms "include," "comprise," and variations thereof do not mean including only the listed items, but may include only the listed items, or may include additional items in addition to the listed items. Furthermore, the term "or" as used in this disclosure is not intended to mean an exclusive or. In this disclosure, when articles are added by translation, such as a, an, and the in English, these articles are intended to include the plural unless the context clearly indicates otherwise.

[0073] The above describes the embodiments in detail with reference to the drawings, but the specific configuration is not limited to that described above, and various design changes can be made within the scope that does not deviate from the gist of the invention.

[0074] The following additional notes are about the features of the above-described embodiment.

[0075] (Appendix 1) a communication unit that communicates with a main power supply management device that manages a main power supply having a synchronous generator and with a plurality of distributed power sources; a control unit that, when the power supplied from the plurality of distributed power sources to the power transmission and distribution network is an output different from that of an operation plan, corrects the operation plan related to the power supply to the power transmission and distribution network of the core power source and each of the plurality of distributed power sources based on synchronous generator information related to the capacity of the synchronous generator in operation; The control unit notifies the core power management device and the plurality of distributed power sources of the modified operation plan.

[0076] (Appendix 2) 2. The energy management device according to claim 1, wherein the notification regarding the operation plan to the core power management device includes at least one of information regarding the number of operating synchronous generators, information regarding the start time of the synchronous generator that will newly start operation, information regarding the output change time of the operating synchronous generator that will undergo an output change, the output of the distributed power source after the output change, the output ratio of GFM (Grid Forming) power source / GFL (Grid Following) power source, the slew rate of the distributed power source, and the capacity of the grid forming power source.

[0077] (Appendix 3) An energy management device as described in Appendix 1 or 2, wherein the control unit notifies the core power management device of the revised operation plan, and then notifies the core power management device to change the output power of the multiple distributed power sources based on a notification of implementation confirmation from the core power management device.

[0078] (Appendix 4) the plurality of distributed power sources are either GFM (Grid Forming) power supply devices or GFL (Grid Following) power supply devices, An energy management device as described in any one of appendix 1 to 3, wherein the control unit controls the output ratio of the GFM power supply device and the GFL power supply device in accordance with the power generation ratio of the core power source in the power transmission and distribution network when the power supplied by the multiple distributed power sources to the power transmission and distribution network is an output different from the operation plan.

[0079] (Appendix 5) When the power generation rate of the synchronous generator in the power transmission and distribution network is high, a notification is given to the plurality of distributed power sources to reduce the output rate of the GFM power supply device; An energy management device as described in Appendix 4, which, when the power generation rate of the synchronous generator in the power transmission and distribution network is not high, notifies the plurality of distributed power sources to maintain or increase the output rate of the GFM power supply device.

[0080] (Appendix 6) The output different from the operation plan is an output that is smaller than the output of the operation plan, the notification to reduce the output rate of the GFM power supply device is a notification to reduce the output of the GFM power supply device, 6. The energy management device of claim 5, wherein the notification to maintain or increase the output ratio of the GFM power supply device is a notification to decrease the output of the GFL power supply device.

[0081] (Appendix 7) 7. The energy management device according to claim 6, wherein, when the power generation amount of the synchronous generator in operation can be increased to be equal to or greater than the power generation amount in the operation plan of the plurality of distributed power sources, the control unit notifies the user of an increase in the power generation amount of the synchronous generator along with a notification to reduce the output.

[0082] (Appendix 8) 7. The energy management device according to claim 5, wherein, when the control unit cannot increase the amount of power generated by the synchronous generators in operation to be equal to or greater than the amount of power generated in the operation plan of the plurality of distributed power sources, the control unit issues a notification to reduce the output and a notification to increase the number of operating synchronous generators.

[0083] (Appendix 9) 9. The energy management device according to any one of appendix 6 to 8, wherein the notification to reduce the output includes stopping the plurality of distributed power sources after changing the outputs of the plurality of distributed power sources, and the period until the stopping is determined based on the amount of remaining power generation from the current amount of power generation of the synchronous generator up to an upper limit of the amount of power generation of the synchronous generator in operation, and the notification to extend the period until the stopping is given when the amount of remaining power generation is greater.

[0084] (Appendix 10) The output different from the operation plan is an output that is greater than the output of the operation plan, the notification to reduce the output ratio of the GFM power supply device is a notification to increase the output of the GFL power supply device, 6. The energy management device of claim 5, wherein the notification to maintain or increase the output ratio of the GFM power supply is a notification to increase the output of the GFM power supply.

[0085] (Appendix 11) The energy management device according to claim 10, wherein the control unit notifies a reduction in the amount of power generation of the synchronous generator when the amount of power generation of the synchronous generator in operation can be reduced to or above the amount of power generation that exceeds the amount of power generation in the operation plan of the plurality of distributed power sources.

[0086] (Appendix 12) 11. The energy management device according to claim 9, wherein the control unit issues a notification to reduce the power generation amounts of the plurality of distributed power sources when it is not possible to reduce the power generation amount of the synchronous generator in operation to an amount that exceeds the power generation amounts of the plurality of distributed power sources in the operation plan.

[0087] (Appendix 13) a main power supply management device that manages a main power supply having a synchronous generator; Multiple distributed power sources, an energy management device having a control unit that, when the power supplied from the plurality of distributed power sources to the power transmission and distribution network is an output different from that in an operation plan, corrects the operation plan related to the power supply to the power transmission and distribution network of the main power source and each of the plurality of distributed power sources based on synchronous generator information related to the capacity of the synchronous generator in operation; The control unit of the energy management device notifies the core power management device and the plurality of distributed power sources of the modified operation plan.

[0088] (Appendix 14) When the power supplied from a plurality of distributed power sources to the power transmission and distribution network is an output different from that of the operation plan, the operation plan related to the power supply to the power transmission and distribution network from the trunk power source having the synchronous generator and each of the plurality of distributed power sources is corrected based on synchronous generator information related to the capacity of the synchronous generator in operation; An energy management method, comprising notifying a core power supply management device that manages the core power supply and the plurality of distributed power sources of the revised operation plan.

[0089] (Appendix 15) When the power supplied from a plurality of distributed power sources to the power transmission and distribution network is an output different from that in the operation plan, correcting the operation plan related to the power supply to the power transmission and distribution network from a main power source having a synchronous generator and each of the plurality of distributed power sources based on synchronous generator information related to the capacity of the synchronous generator in operation; and notifying a core power supply management device that manages the core power supply and the plurality of distributed power sources of the revised operation plan. [Explanation of symbols]

[0090] 1 Energy Management System 2 Energy management device 21 Control Unit 211 CPU 212 Volatile memory unit 213 Non-volatile memory unit 22 Communications Department 3. Main power source 31 Core power management device 32 Synchronous generator 34 Communication lines 4 Distributed power generation group 41 GFM power supply (distributed power supply) 411 GFM control device 412 Power generating equipment 4121 Renewable energy power generation equipment 4122 Electricity storage devices 413 GFM inverter 42 GFL power supply (distributed power supply) 421 GFL control device 422 Power generating equipment 4221 Renewable energy power generation equipment 4222 Energy storage devices 423 GFL inverter 45 Load 6. Power transmission and distribution network 7. Communication Networks

Claims

1. a communication unit that communicates with a main power supply management device that manages a main power supply having a synchronous generator and with a plurality of distributed power sources; a control unit that, when the power supplied from the plurality of distributed power sources to the power transmission and distribution network is an output different from that of an operation plan, corrects the operation plan related to the power supply to the power transmission and distribution network of the core power source and each of the plurality of distributed power sources based on synchronous generator information related to the capacity of the synchronous generator in operation; The control unit notifies the core power management device and the plurality of distributed power sources of the modified operation plan.

2. 2. The energy management device according to claim 1, wherein the notification regarding the operation plan to the core power management device includes at least one of information regarding the number of operating synchronous generators, information regarding the operation start time of the synchronous generator that is to newly start operation, information regarding the output change time of the operating synchronous generator that is to undergo an output change, the output of the distributed power source after the output change, the output ratio of GFM (Grid Forming) power source / GFL (Grid Following) power source, the slew rate of the distributed power source, and the capacity of the grid forming power source.

3. 2. The energy management device according to claim 1, wherein the control unit notifies the core power management device of the revised operation plan, and then notifies the core power management device to change the output power of the plurality of distributed power sources based on a notification of implementation confirmation from the core power management device.

4. the plurality of distributed power sources are either GFM (Grid Forming) power supply devices or GFL (Grid Following) power supply devices, 2. The energy management device of claim 1, wherein the control unit controls the output ratio of the GFM power supply device and the GFL power supply device in accordance with the power generation ratio of the core power source in the power transmission and distribution network when the power supplied by the plurality of distributed power sources to the power transmission and distribution network is an output different from the operation plan.

5. When the power generation rate of the synchronous generator in the power transmission and distribution network is high, a notification is given to the plurality of distributed power sources to reduce the output rate of the GFM power supply device; The energy management device according to claim 4 , wherein when the power generation rate of the synchronous generator in the power transmission and distribution network is not high, the plurality of distributed power sources are notified to maintain or increase the output rate of the GFM power supply device.

6. The output different from the operation plan is an output that is smaller than the output of the operation plan, the notification to reduce the output rate of the GFM power supply device is a notification to reduce the output of the GFM power supply device, The energy management device according to claim 5 , wherein the notification to maintain or increase the output rate of the GFM power supply device is a notification to decrease the output of the GFL power supply device.

7. 7. The energy management device according to claim 6, wherein, when the amount of power generated by the synchronous generator in operation can be increased to be equal to or greater than the amount of power generated in the operation plan of the plurality of distributed power sources, the control unit issues a notification to reduce the output and a notification to increase the amount of power generated by the synchronous generator.

8. 7. The energy management device according to claim 6, wherein, when the amount of power generated by the synchronous generators in operation cannot be increased to be equal to or greater than the amount of power generated in the operation plan of the plurality of distributed power sources, the control unit issues a notification to reduce the output and a notification to increase the number of operating synchronous generators.

9. 9. The energy management device according to claim 6, wherein the notification to reduce the output includes stopping the plurality of distributed power sources after changing the outputs of the plurality of distributed power sources, and the period until the stopping is determined based on the amount of remaining power generation from the current amount of power generation of the synchronous generator up to an upper limit of the amount of power generation of the synchronous generator currently in operation, and the notification to extend the period until the stopping is given when the amount of remaining power generation is greater.

10. The output different from the operation plan is an output that is greater than the output of the operation plan, the notification to reduce the output rate of the GFM power supply device is a notification to increase the output rate of the GFL power supply device, The energy management device of claim 5 , wherein the notification to maintain or increase the output rate of the GFM power supply device is a notification to increase the output of the GFM power supply device.

11. 11. The energy management device according to claim 10, wherein the control unit issues a notification of a reduction in the amount of power generation of the synchronous generator when the amount of power generation of the synchronous generator in operation can be reduced to or greater than the amount of power generation that exceeds the amount of power generation in the operation plan of the plurality of distributed power sources.

12. 11. The energy management device according to claim 10, wherein the control unit issues a notification to reduce the power generation amounts of the plurality of distributed power sources when the power generation amount of the synchronous generator in operation cannot be reduced to or above the power generation amount that exceeds the power generation amounts in the operation plan of the plurality of distributed power sources.

13. a main power supply management device that manages a main power supply having a synchronous generator; Multiple distributed power sources, an energy management device having a control unit that, when the power supplied from the plurality of distributed power sources to the power transmission and distribution network is an output different from that in an operation plan, corrects the operation plan related to the power supply to the power transmission and distribution network of the main power source and each of the plurality of distributed power sources based on synchronous generator information related to the capacity of the synchronous generator in operation; The control unit of the energy management device notifies the core power management device and the plurality of distributed power sources of the modified operation plan.

14. When the power supplied from a plurality of distributed power sources to the power transmission and distribution network is an output different from that of the operation plan, the operation plan related to the power supply to the power transmission and distribution network from the trunk power source having the synchronous generator and each of the plurality of distributed power sources is corrected based on synchronous generator information related to the capacity of the synchronous generator in operation; An energy management method, comprising notifying a core power supply management device that manages the core power supply and the plurality of distributed power sources of the revised operation plan.

15. When the power supplied from a plurality of distributed power sources to the power transmission and distribution network is an output different from that in the operation plan, correcting the operation plan related to the power supply to the power transmission and distribution network from a main power source having a synchronous generator and each of the plurality of distributed power sources based on synchronous generator information related to the capacity of the synchronous generator in operation; and notifying a core power supply management device that manages the core power supply and the plurality of distributed power sources of the revised operation plan.

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