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

Abstract

To provide an energy management device that can stably supply power even when cooperation with a device that manages distributed power sources is lost.SOLUTION: An energy management device includes a communication unit that communicates with a core power source management device that manages a core power source and communicates with a distributed power source management device that manages distributed power sources, and a control unit that acquires core power source information, which is information about the core power source, through communication with the core power source management device, and changes an output change rate at stopping time, which is the standard for an output change rate when stopping the operation of the distributed power source when communication between the communication unit and the distributed power source management device is impossible, based on the core power source information and transmits the changed rate to the distributed power source management device.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] In a distributed power supply area that has distributed power sources such as so-called microgrids, not only do they receive power from a main power source (forward power flow), but they also sometimes supply power to a power transmission and distribution network (for example, a power grid) that the main power source supplies power to (reverse power flow). In particular, when there is a possibility of reverse power flow occurring, the device that manages the distributed power supply area needs to control the power supply, etc. in cooperation with the device that manages the main power source.

[0005] However, if for some reason communication with the device that manages the distributed power source area is lost, there is a risk that reverse power flow that is not recognized by the main power source side or power generation stoppage of the distributed power source will have a significant impact on the frequency and voltage of the power transmission and distribution network. In this case, there is a risk that it will lead to a system accident such as a power outage of the entire power transmission and distribution network.

[0006] 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 supply power stably even when communication with a device that manages distributed power sources is lost. [Means for solving the problem]

[0007] The energy management device of the present disclosure is an energy management device that includes a communication unit that communicates with a core power management device that manages a core power source and with a distributed power management device that manages a distributed power source, and a control unit that acquires core power source information, which is information about the core power source, through communication with the core power management device, and changes the shutdown output change rate, which is a standard for the output change rate when stopping operation of the distributed power source when communication between the communication unit and the distributed power management device is impossible, based on the core power source information and transmits the changed rate to the distributed power management device.

[0008] The energy management system of the present disclosure includes an energy management device, a core power source, and a distributed power source management device that manages distributed power sources, and the energy management device has a communication unit that communicates with the core power source management device that manages the core power source and with the distributed power source management device, and a control unit that acquires core power source information, which is information about the core power source, by communicating with the core power source management device, and changes the shutdown output change rate, which is a standard for the output change rate when stopping operation of the distributed power source when communication between the communication unit and the distributed power source management device is impossible, based on the core power source information and sends the changed rate to the distributed power source management device.

[0009] The energy management method disclosed herein is an energy management method that acquires core power source information, which is information about a core power source, by communicating with a core power source management device that manages the core power source, and modifies the shutdown output change rate, which is the standard for the output change rate when stopping operation of a distributed power source when communication with a distributed power source management device that manages a distributed power source is unavailable, based on the core power source information and transmits the modified rate to the distributed power source management device.

[0010] The energy management program disclosed herein is an energy management program that causes a computer to execute the following steps: obtain core power source information, which is information about a core power source, by communicating with a core power source management device that manages the core power source; and change the shutdown output change rate, which is the standard for the output change rate when stopping operation of a distributed power source when communication with a distributed power source management device that manages a distributed power source is impossible, based on the core power source information and send the change rate to the distributed power source management device. [Effects of the Invention]

[0011] According to the energy management device, energy management system, energy management method, and energy management program disclosed herein, it is possible to supply power stably even when communication with the device that manages the distributed power source is lost. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of an energy management system. [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 a configuration example of a solar power generation device. [Figure 4] FIG. 1 is a diagram schematically illustrating a configuration example of a power storage device. [Figure 5] 10 is a sequence diagram for explaining a process when cooperation between an energy management apparatus and a distributed power management apparatus becomes impossible. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] 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 duplicate descriptions will be omitted as appropriate.

[0014] 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 distributed power source area 4, a power transmission and distribution network 6, and a communication network 7.

[0015] 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 can connect 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.

[0016] The communication unit 22 of the energy management device 2 can communicate with the core power management device 31 that manages the core power source 3 and with the distributed power management device 41 that manages the distributed power sources. The control unit 21 acquires core power source information, which is information about the core power source, through communication with the core power management device 31, and can change the shutdown output change rate, which is the standard for the output change rate when stopping the operation of a distributed power source when communication between the communication unit 22 and the distributed power source management device 41 is unavailable, based on the core power source information and transmit the changed rate to the distributed power source management device 41. As a result, even if cooperation with the distributed power sources is unavailable due to, for example, an inability to communicate with the distributed power source management device 41, the distributed power source management device 41 can stop power generation of each distributed power source taking into account the shutdown output change rate, thereby enabling a stable power supply across the entire power transmission and distribution network 6. In the following description, the processing of the energy management device 2 can be described as processing performed in conjunction with the control unit 21 and the communication unit 22.

[0017] 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 power generation devices that generate power using synchronous generators 32, such as internal combustion engines (thermal power). However, the synchronous generators 32 may include generators that generate power by rotating turbines using hydroelectric power, thermal power, nuclear power, etc., in addition to internal combustion engines. It may also include power generation devices that constitute distributed power sources, as described below. In the present disclosure, the bulk power source 3 includes one or more synchronous generators 32, synchronous generator switchgears 33 that control the connection of each synchronous generator 32 to the power transmission and distribution network 6, and a bulk power management device 31. The bulk power management device 31 can control the start and stop of each synchronous generator 32, the increase and decrease of output, and the synchronous generator switchgears 33, etc., via a communication line 34. It may also manage the overall power supplied to the power transmission and distribution network 6 and the operation plans related to the power supplied to the power transmission and distribution network 6. The main power supply management device 31 can control the synchronous generator 32, the synchronous generator switchgear 33, etc. based on an operation plan. The main power supply management device 31 may be configured as part of a so-called power distribution system. The hardware configuration of the main power supply management device 31 can be the same as that of the energy management device 2 described in FIG. 2, and redundant description will be omitted. Note that the main power supply 3 is not limited to this configuration, and may be configured to supply power to the power transmission and distribution network 6.

[0018] The distributed power supply area 4 includes distributed energy resources (DERs) managed by a distributed power supply management device 41. The distributed power supplies may include renewable energy power generation devices, fuel-power generation devices, battery storage devices (BTs), etc. Here, the 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. The fuel-power generation devices may include power generation devices such as diesel engines (DGs), gas engines, and gas turbines. The battery storage devices may include household storage batteries, industrial storage batteries, and electric vehicle storage batteries. The distributed power supplies may also include fuel cells and engines that use hydrogen. In the present disclosure, the distributed power supply area 4 includes, as distributed power supplies, a plurality of photovoltaic power generation devices ("DER(PV)" in FIG. 1) 42 and a battery storage device ("DER(BT)" in FIG. 1) 43. However, the distributed power supplies may be other distributed power supplies instead of or in addition to these. Furthermore, there may be one or more distributed power sources.

[0019] The distributed power supply area 4 may further include a load 44, a distributed power supply power line 49, and a distributed power supply area switch 47. The distributed power supply power line 49 can be connected to the power transmission and distribution network 6 via the distributed power supply area switch 47. The load 44 is a load that consumes power supplied from the distributed power sources 42 and 43 or the power transmission and distribution network 6, and may be a home or a business. The distributed power supply management device 41 may communicate with control devices 422 and 432 of the photovoltaic power generation device 42 and the power storage device 43, respectively, described below, via a communication network 48. This communication allows the status of the photovoltaic power generation device 42 and the power storage device 43 to be acquired and the operation of each to be controlled. The distributed power supply management device 41 may also control a load switch 441 that controls the connection between the load 44 and the distributed power supply power line 49, and the distributed power supply area switch 47.

[0020] The communication network 48 may be a network using a dedicated line or a public network such as the Internet. The distributed power management apparatus 41 may be a server apparatus such as a cloud server connected to the Internet as long as it can communicate with each of the control devices 422 and 432. The core power management apparatus 31 may be configured as part of a so-called power distribution system. The hardware configuration of the distributed power management apparatus 41 may be the same as that of the energy management apparatus 2 described in FIG. 2, and redundant description will be omitted. The distributed power management apparatus 41 may be configured as an apparatus referred to as a so-called distributed energy resource management system (DERMS).

[0021] The distributed power supply area 4 may include a distributed power supply managed by the distributed power supply management device 41, and may be a so-called microgrid, an independent regional system, or may include multiple microgrids or multiple independent regional systems. Note that the distributed power supply area 4 is not limited to this configuration, and may be configured to include at least one distributed power supply that can be connected to the power transmission and distribution network 6, and a control device that is connected to the communication network 7 and controls the distributed power supply.

[0022] FIG. 3 is a diagram schematically illustrating an example configuration of a solar power generation system 42. As shown in this diagram, the solar power generation system 42 may include a PV control device 422, a solar power generation panel 423, a PV inverter 424, and a PV switch 421. The solar power generation panel 423 receives light such as sunlight and generates power. The PV inverter 424 converts DC power generated by the solar power generation panel 423 into AC power and outputs the AC power. The PV control device 422 controls the output power of the PV inverter 424 and controls the connection between the output power line of the PV inverter 424 and the distributed power source power line 49 via the PV switch 421. The PV control device 422 communicates with the distributed power source management apparatus 41 via a communication network 48. Through this communication, the PV control device 422 can notify the distributed power source management apparatus 41 of the power generation status of the solar power generation panel 423. Furthermore, through this communication, the PV control device 422 may control the output of the PV inverter 424 and control the connection between the PV inverter 424 and the distributed power supply power line 49 by the PV switch 421 based on instructions from the distributed power supply management device 41. The distributed power supply management device 41 may issue instructions directly to the PV inverter 424, or may issue instructions via an information processing device other than the PV control device 422. The hardware configuration of the PV control device 422 may be the same as that of the energy management device 2 described in FIG. 2, and therefore a duplicated description will be omitted.

[0023] FIG. 4 is a diagram schematically illustrating an example configuration of the power storage device 43. As shown in this diagram, the power storage device 43 may include a BT control device 432, a storage battery 433, a BT inverter 434, and a BT switch 431. The storage battery 433 can be in any one of the following states: charging (storing supplied power), discharging (supplying power), or neither charging nor discharging. The BT inverter 434 can convert DC power discharged by the storage battery 433 into AC power and output the converted AC power. The BT inverter 434 can also convert AC power into DC power to charge the storage battery 433. The BT control device 432 may control the output power of the BT inverter 434 and the BT switch 431 to control the connection between the input / output power line of the BT inverter 434 and the distributed power source power line 49, thereby controlling switching between charging and discharging the storage battery 433. The BT control device 432 communicates with the distributed power source management device 41 via a communication network 48. Through this communication, the BT control device 432 can notify the distributed power supply management device 41 of the state of charge (SOC: State Of Charge) of the storage battery 433. Furthermore, through this communication, the BT control device 432 may control the input / output of the BT inverter 434, switch the charge / discharge state, and control the connection between the BT inverter 434 and the distributed power supply power line 49 by the BT switch 431, based on instructions from the distributed power supply management device 41. Note that the distributed power supply management device 41 may issue instructions directly to the BT inverter 434, or may issue instructions via an information processing device other than the BT control device 432. Note that the hardware configuration of the BT control device 432 can be the same as that of the energy management device 2 described in FIG. 2, and therefore a duplicated description will be omitted.

[0024] FIG. 5 is a sequence diagram illustrating processing S100 when cooperation between the energy management device 2 and the distributed power source management device 41 becomes unavailable in the energy management system 1 according to the present disclosure. As shown in this sequence diagram, in step S121, the energy management device 2 (controller 21) receives and acquires utility power source information, which is information about the utility power source 3, and in step S122, calculates the shutdown output change rate. In calculating the shutdown output change rate, an upper limit for the output increase rate is calculated based on the acquired utility power source information, and then the shutdown output change rate is calculated based on the upper limit for the output increase rate. This makes it possible to change the shutdown output change rate. As a result, when power generation by each distributed power source is stopped, the utility power source 3 can increase its output at an output increase rate that it can output, thereby enabling a stable power supply across the entire power transmission and distribution network 6.

[0025] Here, the main power supply information may be the number and type of operating synchronous generators 32 that constitute the main power supply 3. Here, the type of synchronous generator 32 may refer to a key consisting of a character string or the like that can acquire the capacity, such as the range of the output increase rate, from a pre-stored database or the like. For example, it may be a model number or an identification number. The capacity of the synchronous generator 32 may also be acquired directly as the main power supply information. By acquiring the main power supply information, it is possible to calculate a more accurate upper limit of the output increase rate, and further, it is possible to make the shutdown output change rate calculated based on the output increase rate a more accurate value. In addition, the unit of output that can be used may be watts (W) for electric power, watt-hours (Wh) for electric energy, joules (J) for mechanical output of the synchronous generator, or the like.

[0026] For example, when a distributed power source in the distributed power source area 4 that has been supplying power (reverse power flow) to the power transmission and distribution network 6 stops, the synchronous generator 32 increases its output to compensate for the lost power. In this case, if the output power of the distributed power source area 4 decreases at a rate that exceeds the upper limit of the output increase rate of the synchronous generator 32, it will cause a disruption to the power supply to the power transmission and distribution network 6. The output change rate at stoppage is the lower limit of the change rate of the output power when power generation by the distributed power source in the distributed power source area 4 stops, and its absolute value is calculated so as not to exceed the upper limit of the output increase rate of the synchronous generator 32 that provides the supplementary power. When the distributed power source area 4 stops power generation by a distributed power source that it manages, it is required that the change rate of the output power does not fall below the output change rate at stoppage.

[0027] When the main power source 3 includes a plurality of operating synchronous generators 32, the upper limit of the output increase rate can be the sum of the output increase rates of the respective synchronous generators 32. Here, if it is considered that the range in which the output should be increased exceeds the upper limit of the synchronous generators 32 currently in operation, it is necessary to newly increase the number of operating synchronous generators 32, and the output increase rate can be calculated taking into account the time required for operating the new synchronous generators 32. Therefore, the upper limit of the output increase rate can be calculated for each range of required output increase. The output change rate during shutdown may be a value obtained by multiplying the upper limit of the output increase rate by -1, or may be a value obtained by multiplying the upper limit of the output increase rate by a ratio such as -0.7 to -0.9 so as not to become the upper limit of the output increase rate.

[0028] In step S123, the calculated shutdown output change rate is notified to the distributed power source management device 41. Steps S121 to S123 (S120) may be performed periodically, for example, every 30 minutes, independently of other processes. Furthermore, the acquisition of the utility power source information in step S121 and the process S120 may be performed each time the utility power source information is changed, such as when the number of operating synchronous generators 32 of the utility power source is changed, or each time the operation plan is updated. By keeping the utility power source information up to date in this way, a more accurate shutdown output change rate can be calculated and changed. The operation plan can be configured to plan the amount of power generated by each power generation unit so that the power supply and demand are neither excessive nor insufficient, based on the power demand forecast, the renewable energy power generation forecast, the charge state of the power storage device, the capacity of each power generation unit, and the like. Furthermore, the operation plan may be modified as needed based on changes in the demand and supply situation.

[0029] In step S110, the energy management device 2 and the distributed power management device 41 transmit and receive a life / death signal to each other. The life / death signal is a signal that confirms whether the devices are stopped or unable to communicate with each other. If a predetermined response is not received in response to a predetermined transmission multiple times, it can be determined that cooperation is impossible due to a communication failure or the like. Note that in the present disclosure, the life / death signal is used to confirm whether the devices can cooperate with each other, but communication used for other purposes may also be used as the life / death signal. Furthermore, even if communication of the life / death signal fails, if communication of the life / death signal is confirmed after a predetermined period of time, it may be determined that cooperation is established.

[0030] If the distributed power supply management apparatus 41 determines that the communication of the alive or dead signal is normal (step S111: Yes), it can periodically repeat the process of sending and receiving the alive or dead signal. If the distributed power supply management apparatus 41 does not determine that the communication of the alive or dead signal is normal (step S111: No), it performs the distributed power supply shutdown process S112.

[0031] In the distributed power source shutdown process S112, the distributed power source management device 41 instructs each distributed power source to stop power generation at a rate of change that is not lower than the most recent shutdown output change rate notified. For example, the distributed power source management device 41 controls the output of each PV inverter 424 so that it does not fall below its respective shutdown output change rate, thereby stopping the power generation output. The shutdown output change rate can be set as the lower limit of the output change rate of each distributed power source (e.g., each photovoltaic power generation device 42) managed by the distributed power source management device 41 when communication with the distributed power source management device 41 becomes unavailable. This allows the distributed power source management device 41 to reduce the output at an output change rate that does not fall below the lower limit of the output change rate of each distributed power source when stopping power generation in the distributed power source area 4. This allows the bulk power source 3 to increase its output power while avoiding a power supply shortage throughout the entire power transmission and distribution network 6. Here, each distributed power source (e.g., each photovoltaic power generation device 42) may have a dischargeable power storage device so that the output change rate can be controlled.

[0032] Furthermore, the output change rate at shutdown may be set as a lower limit value for the output change rate of the entire distributed power source area 4 managed by the distributed power source management device 41 when cooperation with the distributed power source management device 41 becomes impossible. In this case, for example, the distributed power source management device 41 can control the output change rate of each PV inverter 424 and the output of the BT inverter 434 so that it does not fall below the output change rate at shutdown. As a result, when stopping power generation in the distributed power source area 4, the distributed power source management device 41 can reduce the output so that the output change rate of the entire distributed power source area 4 does not fall below the output change rate at shutdown. This allows the bulk power source 3 to increase its output power while avoiding a power supply shortage in the entire power transmission and distribution network 6. The distributed power source management device 41 may calculate the output change rate of each distributed power source from the output change rate at shutdown of the entire distributed power source area 4 and issue instructions to the inverters of each distributed power source.

[0033] In this case, even if it is difficult for the photovoltaic power generation device 42 to gradually reduce the output in its PV inverter 424, the power storage device 43 or the like can reduce the output so that the output does not fall below the output change rate at the time of shutdown. Specifically, when the output of the photovoltaic power generation device 42 is stopped by the PV inverter 424, the power storage device 43 outputs power that is equal to the power that the photovoltaic power generation device 42 was outputting, plus the power. Then, the power storage device 43 gradually reduces the added power at a rate that does not fall below the output change rate at the time of shutdown, thereby making it possible to reduce the output so that the output does not fall below the output change rate at the time of shutdown. Each photovoltaic power generation device 42 may be configured to include a power storage device that gradually reduces its output to stop power generation.

[0034] If the energy management device 2 determines that communication of the alive / dead signal is normal (step S113: Yes), it can periodically repeat the process of sending and receiving the alive / dead signal. If it does not determine that communication of the alive / dead signal is normal (step S113: No), it determines that cooperation with the distributed power source management device 41 has been lost, and in step S114, it notifies the core power source management device 31 of a distributed power source shutdown notification. Here, the distributed power source shutdown notification is not limited to a notification that means that the distributed power source will be shut down, but may be a notification that informs the core power source management device 31 that an output increase is required. The distributed power source shutdown notification may also include the output change rate at shutdown notified to the distributed power source management device 41.

[0035] In this way, the control unit 21 of the energy management device 2 communicates with the distributed power source management device 41 to communicate with the distributed power source management device 41, and if the communication fails, transmits a distributed power source shutdown notification. As a result, even if the distributed power source management device 41 stops power generation in the distributed power source area 4 due to a failure of the communication, the energy management device 2 allows the bulk power source 3 to increase its output power while avoiding an output shortage in the entire power supply area. In this case, the control unit 21 may update the operation plan of the bulk power source 3 to an operation plan for when power generation of each distributed power source is stopped, and notify the bulk power source management device 31 that manages the bulk power source 3 of the updated operation plan in the distributed power source shutdown notification. This allows the bulk power source 3 to increase its output using the operation plan updated by the energy management device 2, which has information on the output change rate at shutdown, thereby enabling a stable power supply across the entire power transmission and distribution network 6. Furthermore, when notifying the bulk power source 3 of the distributed power source shutdown notification, the control unit 21 may also notify the distributed power source management device 41 of the most recent output change rate at shutdown that it has notified. This allows the main power source 3 to increase its output by using information on the rate of change of output during outage, thereby enabling the power transmission and distribution network 6 as a whole to provide a stable power supply.

[0036] Upon receiving the notification that the distributed power source has been stopped, the core power source management device 31 performs output increase processing S115. In output increase processing S115, the core power source management device 31 issues an instruction to increase output in response to a decrease in output in the distributed power source area 4. In this case, the core power source 3 can increase output in response to the decrease in output power in the distributed power source area 4. The core power source 3 may also increase output based on an updated operation plan. The core power source 3 may also increase output based on the received output change rate at the time of stoppage.

[0037] Therefore, even if the energy management device 2 or the distributed power source management device 41 stops power generation in the distributed power source area 4, the core power source 3 can increase the output power while avoiding an output shortage in the entire transmission and distribution network 6.

[0038] As described above, the energy management device 2, energy management system 1, energy management method, and energy management program disclosed herein can stably supply power even when cooperation between the energy management device 2 and the distributed power source management device 41 that manages the distributed power source is lost.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The following additional notes are about the features of the above-described embodiment.

[0044] (Appendix 1) a communication unit that communicates with a core power management device that manages the core power source and with a distributed power management device that manages the distributed power sources; a control unit that acquires core power supply information, which is information about the core power supply, by communication with the core power supply management device, and changes a shutdown output change rate, which is a standard for the output change rate when stopping operation of the distributed power supply when communication between the communication unit and the distributed power supply management device is disabled, based on the core power supply information and transmits the changed rate to the distributed power supply management device. Energy management devices.

[0045] (Appendix 2) the control unit derives an upper limit of an output increase rate of a synchronous generator constituting the main power supply based on the main power supply information, and derives the shutdown output change rate based on the upper limit of the output increase rate. 10. The energy management device of claim 1.

[0046] (Appendix 3) The main power supply information is the number and type of operating synchronous generators that constitute the main power supply. 3. The energy management device according to claim 1 or 2.

[0047] (Appendix 4) the control unit acquires the main power supply information when there is a change in the number of operating synchronous generators that constitute the main power supply. 4. An energy management device according to any one of claims 1 to 3.

[0048] (Appendix 5) the shutdown output change rate is a lower limit of the output change rate of each distributed power source managed by the distributed power source management device when cooperation with the distributed power source management device becomes impossible; 5. An energy management device according to any one of claims 1 to 4.

[0049] (Appendix 6) the shutdown output change rate is a lower limit of the output change rate of the entire distributed power source area managed by the distributed power source management device when cooperation with the distributed power source management device becomes impossible; 6. An energy management device according to any one of claims 1 to 5.

[0050] (Appendix 7) The control unit periodically communicating with the distributed power management device; If the alive / dead signal communication fails, a distributed power supply stop notification is sent to the core power supply management device that manages the core power supply. 7. An energy management device according to any one of claims 1 to 6.

[0051] (Appendix 8) The control unit An energy management device as described in Appendix 7, which, if the alive signal communication fails, updates the operation plan of the core power source to the operation plan for when power generation of each distributed power source managed by the distributed power source management device stops, and notifies the updated operation plan in the distributed power source stop notification.

[0052] (Appendix 9) The energy management device according to claim 7, wherein the control unit notifies the distributed power source management device of the latest output change rate at the time of suspension when notifying the main power source of the distributed power source suspension notification.

[0053] (Appendix 10) an energy management device; The main power source and a distributed power supply management device that manages the distributed power supplies, The energy management device a communication unit that communicates with a core power management device that manages the core power source and with the distributed power management device; a control unit that acquires core power supply information, which is information about the core power supply, by communication with the core power supply management device, and changes a shutdown output change rate, which is a standard for the output change rate when stopping operation of the distributed power supply when communication between the communication unit and the distributed power supply management device is disabled, based on the core power supply information and transmits the changed rate to the distributed power supply management device. Energy management system.

[0054] (Appendix 11) The energy management device further performs alive / dead signal communication with the distributed power source management device, and if the alive / dead signal communication fails, notifies the main power source of a distributed power source stop notification; An energy management system as described in Appendix 10, wherein, when the alive signal communication fails, the distributed power source management device instructs each distributed power source managed by the distributed power source management device to stop power generation at a rate of change that does not fall below the lower limit value of the output change rate at the time of shutdown.

[0055] (Appendix 12) Acquire trunk power supply information, which is information about the trunk power supply, by communicating with a trunk power supply management device that manages the trunk power supply; An energy management method in which a shutdown output change rate, which is a standard for the output change rate when stopping the operation of a distributed power source when communication with a distributed power source management device that manages the distributed power source is unavailable, is changed based on the core power source information and transmitted to the distributed power source management device.

[0056] (Appendix 13) Acquiring main power supply information, which is information about a main power supply, by communication with a main power supply management device that manages the main power supply; An energy management program that causes a computer to execute the following: changing the shutdown output change rate, which is the standard for the output change rate when stopping the operation of a distributed power source when communication with a distributed power source management device that manages the distributed power source is impossible, based on the core power source information and transmitting the changed rate to the distributed power source management device. [Explanation of symbols]

[0057] 1 Energy Management System 2 Energy management device 21 Control section 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 33 Synchronous generator switch 4. Distributed power supply area 41 Distributed power management device 42 Photovoltaic power generation equipment (distributed power source) 421 PV switch 422 PV control device 423 Solar Panels 424 PV inverter 43 Energy storage device (distributed power source) 431 BT Switch 432 BT control device 433 Storage Battery 434 BT inverter 44 Load 441 Load switch 47 Distributed power supply area switch 48 Communication Networks 49 Distributed power power line 6. Power transmission and distribution network 7. Communication Networks

Claims

1. a communication unit that communicates with a core power management device that manages the core power source and with a distributed power management device that manages the distributed power sources; a control unit that acquires core power supply information, which is information about the core power supply, by communication with the core power supply management device, and changes a shutdown output change rate, which is a standard for the output change rate when stopping operation of the distributed power supply when communication between the communication unit and the distributed power supply management device is disabled, based on the core power supply information and transmits the changed rate to the distributed power supply management device. Energy management devices.

2. the control unit derives an upper limit of an output increase rate of a synchronous generator constituting the main power supply based on the main power supply information, and derives the shutdown output change rate based on the upper limit of the output increase rate. The energy management device of claim 1 .

3. The main power supply information is the number and type of operating synchronous generators that constitute the main power supply. The energy management device of claim 1 .

4. the control unit acquires the main power supply information when there is a change in the number of operating synchronous generators that constitute the main power supply. The energy management device of claim 1 .

5. the shutdown output change rate is a lower limit of the output change rate of each distributed power source managed by the distributed power source management device when cooperation with the distributed power source management device becomes impossible; The energy management device of claim 1 .

6. the shutdown output change rate is a lower limit of the output change rate of the entire distributed power source area managed by the distributed power source management device when cooperation with the distributed power source management device becomes impossible; The energy management device of claim 1 .

7. The control unit periodically communicating with the distributed power management device; If the alive / dead signal communication fails, a distributed power supply stop notification is sent to the core power supply management device that manages the core power supply. The energy management device of claim 1 .

8. The control unit 8. The energy management device of claim 7, wherein, when the alive signal communication fails, the operation plan of the core power source is updated to the operation plan for when power generation of each distributed power source managed by the distributed power source management device stops, and the updated operation plan is notified in the distributed power source stop notification.

9. The energy management device according to claim 7 , wherein the control unit notifies the distributed power source management device of the latest output change rate at the time of suspension when notifying the main power source of the notification of suspension of the distributed power source.

10. an energy management device; The main power source and a distributed power supply management device that manages the distributed power supplies, The energy management device a communication unit that communicates with a core power management device that manages the core power source and with the distributed power management device; a control unit that acquires core power supply information, which is information about the core power supply, by communication with the core power supply management device, and changes a shutdown output change rate, which is a standard for the output change rate when stopping operation of the distributed power supply when communication between the communication unit and the distributed power supply management device is disabled, based on the core power supply information and transmits the changed rate to the distributed power supply management device. Energy management system.

11. The energy management device further performs alive / dead signal communication with the distributed power source management device, and if the alive / dead signal communication fails, notifies the main power source of a distributed power source stop notification; 11. The energy management system of claim 10, wherein the distributed power source management device instructs each distributed power source managed by the distributed power source management device to stop power generation at a rate of change that does not fall below a lower limit value of the output change rate at the time of shutdown when the alive or dead signal communication fails.

12. Acquire trunk power supply information, which is information about the trunk power supply, by communicating with a trunk power supply management device that manages the trunk power supply; An energy management method in which a shutdown output change rate, which is a standard for the output change rate when stopping the operation of a distributed power source when communication with a distributed power source management device that manages the distributed power source is unavailable, is changed based on the core power source information and transmitted to the distributed power source management device.

13. Acquiring main power supply information, which is information about a main power supply, by communication with a main power supply management device that manages the main power supply; An energy management program that causes a computer to execute the following: changing the shutdown output change rate, which is the standard for the output change rate when stopping the operation of a distributed power source when communication with a distributed power source management device that manages the distributed power source is impossible, based on the core power source information and transmitting the changed rate to the distributed power source management device.

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