Distributed power source control system, power source control device, and distributed power source control method

Abstract

To provide a distributed power source control system, a power source control device, and a distributed power source control method that make it possible to appropriately start up distributed power sources of regional independent power grids in an area divided by an area switch.SOLUTION: A distributed power source control system 1 includes a micro grid (MG) 100 having two or more distributed power sources and a power source control device. The two or more distributed power sources are connected to one or more regional independent grids that exist in an area divided by an area switch 13 that is controlled by a management server that manages power grids. The power source control device controls the distributed power sources. The power source control device starts up specific distributed power sources selected from two or more distributed power sources using a voltage control method when the area is disconnected by the area switch.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a distributed power supply control system, a power supply control device, and a distributed power supply control method. [Background technology]

[0002] In recent years, the use of distributed power sources such as solar cell devices, power storage devices, and fuel cell devices has been attracting attention. For example, a section (regional independent system) that can be disconnected from the power system by a sectionalizing switch is also known. In a regional independent system disconnected from the power system by a sectionalizing switch, an operation (hereinafter, isolated operation) is known in which power is supplied from a distributed power source to a load (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-70448 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when a fault occurs in the power system, the general electricity transmission and distribution company may disconnect the area including the power system where the fault occurred (hereinafter, the fault area) by controlling an area switch controlled by the general electricity transmission and distribution company in order to identify the fault location in the power system. The area partitioned by the area switch is an area that indicates an area including a region, a facility, etc.

[0005] After careful consideration, the inventors discovered that when a faulty area is disconnected, the distributed power sources of the regional independent grids in the faulty area cannot be started up properly because there is no reference power system for the distributed power sources.

[0006] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a distributed power supply control system, a power supply control device, and a distributed power supply control method that enable the appropriate startup of distributed power supplies in a regional independent system in an area partitioned by an area switch. [Means for solving the problem]

[0007] The disclosed aspect is a distributed power source control system comprising two or more distributed power sources connected to one or more regional independent power systems located in an area partitioned by an area switch controlled by a management server that manages the power system, and a power source control device that controls the distributed power sources, wherein the power source control device starts up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch.

[0008] The disclosed aspect is a power supply control device that controls two or more distributed power sources connected to one or more regional independent power systems in an area partitioned by an area switch controlled by a management server that manages the power system, and that includes a control unit that starts up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch.

[0009] The disclosed aspect is a distributed power source control method, comprising a step of a power source control device that controls two or more distributed power sources connected to one or more regional independent systems in an area partitioned by an area switch controlled by a management server that manages the power system, starting up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch. Effect of the Invention

[0010] According to the present invention, it is possible to provide a distributed power supply control system, a power supply control device, and a distributed power supply control method that enable the appropriate startup of distributed power supplies in a regional independent system in an area partitioned by an area switch. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a distributed power supply control system 1 according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing the MG 100 according to the embodiment. [Diagram 3] FIG. 3 is a diagram showing the MG_EMS 150 according to the embodiment. [Figure 4] FIG. 4 is a diagram showing the MG server 300 according to the embodiment. [Diagram 5] FIG. 5 is a diagram for explaining an operation example according to the embodiment. [Figure 6] FIG. 6 is a diagram for explaining an operation example according to the embodiment. [Figure 7] FIG. 7 is a diagram for explaining an operation example according to the second modification. [Figure 8] FIG. 8 is a diagram for explaining an operation example according to the second modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the embodiments will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic.

[0013] [Embodiment] (Distributed Power Control System) A distributed power supply control system according to an embodiment will be described below.

[0014] 1, the distributed power supply control system 1 has an MG (Micro Grid) 100. The distributed power supply control system 1 may include a substation 10, a management server 200, or an MG server 300. The MG 100 is a section (regional independent power system) that can be disconnected from the power system 12 by a sectional switch 191 described later, and is an area downstream of the sectional switch 191. Downstream means a direction away from the substation 10.

[0015] The substation 10 is connected to an electric power grid 12 and transforms the voltage of the electric power grid 12. The substation 10 may replace a generating station or a baseload power source.

[0016] The MG 100 is connected to the power system 12. The MG 100 can be electrically connected to the substation 10 or the power system 12 by an area switch 13, and can be electrically disconnected from the substation 10 or the power system 12 by the area switch 13. The MG 100 may be referred to as a local independent system. The MG 100 may be a unit (e.g., a village, a town) that utilizes a distributed power source in the area. The MG 100 may be a complex facility including two or more facilities.

[0017] In FIG. 1, MG100A to MG100C are illustrated as examples of MG100. MG100A to MG100C exist in an area partitioned by an area switch 13. An area is an area including a region, a facility, and the like. Hereinafter, the power system 12 upstream of the area switch 13 is referred to as a power system 12A, and the power system 12 downstream of the area switch 13 is referred to as a power system 12B. The power system 12A may be referred to as a first power system, and the power system 12B may be referred to as a second power system. Upstream may be considered to be a term indicating a side closer to the substation 10, and downstream may be considered to be a term indicating a side farther from the substation 10.

[0018] In the embodiment, MG100A is arranged upstream of MG100B and MG100C, and MG100B is arranged upstream of MG100C. Note that "upstream" may be considered as a term indicating the side closer to the substation 10 (area switch 13). Details of MG100 will be described later (see FIG. 2).

[0019] The management server 200 is a server managed by a business operator. The business operator may be a general electricity transmission and distribution business operator or a general electric utility that manages the power grid 12. The management server 200 may be capable of communicating with a device (for example, an MG_EMS 150 described later) installed in the MG 100. The management server 200 controls the area switch 13 to connect the MG 100 to the power grid 12A or to disconnect the MG 100 from the power grid 12A. Hereinafter, the management server 200 may also be referred to as a general electricity transmission and distribution business operator.

[0020] In the embodiment, the management server 200 is an example of a management server that manages the power system 12 connected to the regional independent system (MG100).

[0021] The MG server 300 is a server that comprehensively manages MG 100A to MG 100C. The MG server 300 may be capable of communicating with devices (for example, MG_EMS 150 described later) installed in MG 100. The MG server 300 may be capable of communicating with management server 200. The function of the MG server 300 may be substituted by any one of the devices (for example, MG_EMS 150 described later) installed in MG 100. Details of the MG server 300 will be described later (see FIG. 4).

[0022] (Regional independent system) The following describes a regional grid (MG) according to an embodiment. As shown in Fig. 2, the MG 100 includes a distributed power source 110, a switch 121, a load 130, a switch 131, an MG_EMS (Energy Management System) 150, a section switch 191, and a transfer trip function (hereinafter, TTS) 192.

[0023] The distributed power source 110 is connected to a power line 14 in the MG 100. The power line 14 may be referred to as an area independent system. The distributed power source 110 has a power source 111 and a PCS (Power Conditioning System) 112. The power source 111 may be a solar cell device, a power storage device, or a fuel cell device. The PCS 112 converts the output voltage of the power source 111. When the power source 111 is a power storage device, the PCS 112 converts the input voltage of the power storage device in addition to the output voltage of the power storage device.

[0024] In FIG. 2, the distributed power sources 110 are exemplified by a distributed power source 110A having a power source 111A and a PCS 112A, and a distributed power source 110B having a power source 111B and a PCS 112B.

[0025] The switch 121 is disposed between the distributed power source 110 and the power line 14. The switch 121 connects the distributed power source 110 to the power line 14 or disconnects the distributed power source 110 from the power line 14.

[0026] In FIG. 2, the switch 121 is exemplified by a switch 121A that connects / disconnects the distributed power source 110A and a switch 121B that connects / disconnects the distributed power source 110B.

[0027] In the embodiment, when a power outage is detected in MG100, the distributed power source 110 may transition from an operation in a state where it is connected to MG100 (power line 14) (independent operation of MG100 described below) to an independent operation in a state where it is disconnected from MG100 (power line 14). In other words, when a power outage is detected in MG100, the switch 121 may disconnect the distributed power source 110 from the power line 14. The disconnection of the distributed power source 110 may be executed autonomously by the switch 121 or may be executed by MG_EMS 150.

[0028] The load 130 is a device that consumes power. For example, the load 130 may include an air conditioner, a heat pump water heater, a lighting device, and the like.

[0029] MG_EMS 150 is connected to the distributed power sources 110 and the switches 121, and controls the distributed power sources 110 and the switches 121. MG_EMS 150 is connected to the loads 130 and the switches 131, and controls the loads 130 and the switches 131. Details of MG_EMS 150 will be described later (see FIG. 3).

[0030] In the embodiment, the MG_EMS 150 is an example of a power supply control device that controls the distributed power supplies 110 .

[0031] The section switch 191 is disposed between the power system 12B and the MG 100 (the power line 14). The section switch 191 connects the MG 100 to the power system 12B or disconnects the MG 100 from the power system 12B.

[0032] The TTS 192 may receive a disconnection signal from the MG_EMS 150 to disconnect the MG 100 from the power system 12B. The TTS 192 controls the sectional switch 191 in response to the disconnection signal to disconnect the MG 100 from the power system 12B. The TTS 192 may receive a connection signal from the MG_EMS 150 to connect the MG 100 to the power system 12B. The TTS 192 may control the sectional switch 191 in response to the connection signal to connect the MG 100 to the power system 12B.

[0033] In the embodiment, the operating states of the distributed power source 110 may include the operating states shown below. Specifically, the operating state of the distributed power source 110 may include a grid-connected operation in which the distributed power source 110 is connected to the power line 14. The operating state of the distributed power source 110 may include an independent operation in which the distributed power source 110 is disconnected from the power line 14. The operating state of the distributed power source 110 may include a stopped state in which the distributed power source 110 is stopped.

[0034] Here, the interconnected operation of the distributed power source 110 may include an interconnected operation in a state where the MG 100 is interconnected to the power system 12B by the sectional switch 191 and the distributed power source 110 is interconnected to the power line 14. The interconnected operation of the distributed power source 110 may also include an interconnected operation in a state where the MG 100 is disconnected from the power system 12B by the sectional switch 191 and the distributed power source 110 is interconnected to the power line 14.

[0035] Furthermore, in a state where MG100 is disconnected from power system 12A by area switch 13, the state where dispersed power source 110 operates in the interconnected operation may be referred to as isolated operation of MG100. That is, the isolated operation of MG100 may include a first isolated operation in which MG100 is connected to power system 12B by section switch 191, and a second isolated operation in which MG100 is disconnected from power system 12B by section switch 191.

[0036] The independent operation of the distributed power source 110 may include an operation in a state where the MG 100 is connected to the power system 12B by the sectional switch 191, and the distributed power source 110 is disconnected from the power line 14. The independent operation of the distributed power source 110 may include an operation in a state where the MG 100 is disconnected from the power system 12B by the sectional switch 191, and the distributed power source 110 is disconnected from the power line 14.

[0037] (Power supply control device) The power supply control device (MG_EMS) according to the embodiment will be described below. As shown in FIG.

[0038] The communication unit 151 is configured by a communication module. The communication module may be a wireless communication module conforming to a standard such as IEEE802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, or 6G, or may be a wired communication module conforming to a standard such as IEEE802.3.

[0039] First, the communication unit 151 may execute communication with the management server 200. For example, the communication unit 151 may receive a power outage signal from the management server 200 in response to a malfunction (e.g., a power outage) in the power grid 12. The communication unit 151 may receive a power restoration signal from the management server 200 in response to elimination of the malfunction (e.g., restoration of power) in the power grid 12.

[0040] Secondly, the communication unit 151 may communicate with the distributed power source 110. For example, the communication unit 151 may transmit a control command to the distributed power source 110 to control the distributed power source 110. The communication unit 151 may receive state information indicating the operation state (grid-connected operation or independent operation) of the distributed power source 110 from the distributed power source 110.

[0041] The management unit 152 is configured with a storage medium such as a hard disk drive (HDD), a solid state drive (SSD), or a non-volatile memory.

[0042] For example, the management unit 152 may manage location information that specifies the location of the MG 100. The management unit 152 may manage the specifications of the distributed power sources 110 installed in the MG 100. The specifications may include the rated power generation of the solar cell device, the rated charging power of the power storage device, the rated discharging power of the power storage device, and the rated output power of the fuel cell device. The specifications may include the rated capacity and maximum charging / discharging power of the power storage device.

[0043] The control unit 153 may include at least one processor. The at least one processor may be configured by a single integrated circuit (IC), or may be configured by a plurality of circuits (such as integrated circuits and / or discrete circuits) communicatively connected to each other.

[0044] For example, the control unit 153 may control the communication unit 151 to transmit, in response to a power failure signal, a disconnection signal for disconnecting the MG 100 from the power grid 12B to the TTS 192. The control unit 153 may control, in response to a power restoration signal, the communication unit 151 to transmit, in response to a power restoration signal, a connection signal for connecting the MG 100 to the power grid 12B to the TTS 192.

[0045] In an embodiment, the control unit 153 may perform the following operations.

[0046] First, the control unit 153 may start up a specific distributed power source selected from the distributed power sources 110 connected to one or more regional independent grids (MG100A to MG100C) by a voltage forming method (hereinafter, GFM; Grid Forming) when an area (MG100A to MG100C) is disconnected by the area switch 13. Here, starting up the specific distributed power source may include an operation of transmitting a control command instructing the start up of the specific distributed power source.

[0047] The specific distributed power source is a distributed power source 110 that is set to start up with GFM when an area (MG100A to MG100C) is disconnected by an area switch 13.

[0048] For example, the control unit 153 may select a specific distributed power source for each MG 100 in a state in which each MG 100 is disconnected from the power system 12B by the section switch 191. In such a case, one or more specific distributed power sources may be selected for one MG 100.

[0049] Here, a priority order (hereinafter, startup priority order) may be set for the dispersed power sources 110 connected to each MG 100. The startup priority order may be the order in which the dispersed power sources are started up in the MG 100 in a state in which the MG 100 is disconnected from the power system 12A by the area switch 13 and is also disconnected from the power system 12B by the section switch 191.

[0050] For example, consider a case in which the distributed power sources 110#1, 110#2, and 110#3 are connected to the MG 100A, and the startup priority of the distributed power source 110#1 is higher than the startup priority of the distributed power sources 110#2 and 110#3, and the startup priority of the distributed power source 110#2 is higher than the startup priority of the distributed power source 110#3. In such a case, the distributed power source 110#2 may be started up after the distributed power source 110#1 is started up, and the distributed power source 110#3 may be started up after the distributed power source 110#2 is started up.

[0051] Although not particularly limited, the same startup priority may be set for two or more distributed power sources 110. In other words, two or more distributed power sources 110 may be started up simultaneously.

[0052] In other words, the control unit 153 may start up the two or more distributed power sources 110 in descending order of start-up priority set for the two or more distributed power sources 110 when each of the one or more MGs 100 is disconnected from the power grid 12B.

[0053] As described above, when activation priorities are set for the distributed power sources 110, the specific distributed power source may be considered to be the distributed power source 110 with the highest activation priority. Alternatively, the specific distributed power source may be considered to be the distributed power source 110 with an activation priority that is higher than a predetermined number.

[0054] Secondly, the control unit 153 may start up the specific distributed power sources in the GFM and then start up the distributed power sources other than the specific distributed power sources in the grid following (GFL) mode.

[0055] The dispersed power sources other than the specific dispersed power sources are dispersed power sources 110 that are set to be started up by the GFL when the area (MG100A to MG100C) is disconnected by the area switch 13.

[0056] As described above, when startup priorities are set for the distributed power sources 110, the distributed power sources other than the specific distributed power source may be considered to be the distributed power sources 110 having the second or higher startup priorities. Alternatively, the distributed power sources other than the specific distributed power source may be considered to be the distributed power sources 110 having a startup priority lower than a predetermined number.

[0057] (MG Server) The MG server according to the embodiment will be described below. The MG server 300 may be considered to configure a power supply control device together with the MG_EMS 150. As shown in FIG. 4, the MG server 300 includes a communication unit 310, a management unit 320, and a control unit 330.

[0058] The communication unit 310 is configured by a communication module. The communication module may be a wireless communication module conforming to standards such as IEEE802.11a / b / g / n / ac / ax, ZigBee, Wi-SUN, LTE, 5G, and 6G, or may be a wired communication module conforming to standards such as IEEE802.3.

[0059] First, the communication unit 310 may execute communication with the management server 200. For example, the communication unit 310 may receive a power outage signal from the management server 200 in response to a malfunction (e.g., a power outage) in the power grid 12. The communication unit 310 may receive a power restoration signal from the management server 200 in response to the elimination of the malfunction (e.g., power restoration) in the power grid 12.

[0060] Secondly, the communication unit 310 may execute communication with the distributed power source 110. For example, the communication unit 310 may transmit a control command to the distributed power source 110 to control the distributed power source 110. The communication unit 310 may receive status information indicating the operating status (grid-connected operation or independent operation) of the distributed power source 110 from the distributed power source 110.

[0061] Secondly, the communication unit 310 may communicate with the MG_EMS 150. For example, the communication unit 310 may transmit to the MG_EMS 150 a control command for controlling the distributed power source 110. The communication unit 310 may receive from the MG_EMS 150 status information indicating the operating status (grid-connected operation or independent operation) of the distributed power source 110.

[0062] The management unit 320 is configured with a storage medium such as a hard disk drive (HDD), a solid state drive (SSD), or a non-volatile memory.

[0063] For example, the management unit 320 may manage the state of each MG 100. The state of MG 100 may include whether or not the MG 100 is operating independently. The state of MG 100 may include whether or not the MG 100 is connected to the power system 12B via the section switch 191. The state of MG 100 may include whether or not the MG 100 is connected to the power system 12A via the area switch 13.

[0064] The control unit 330 may include at least one processor. The at least one processor may be configured by a single integrated circuit (IC), or may be configured by a plurality of circuits (such as integrated circuits and / or discrete circuits) communicatively connected to each other.

[0065] In an embodiment, the controller 330 may perform the following operations.

[0066] After starting up the specific distributed power source with the GFM, the control unit 330 may select from one or more MGs 100 and connect a target area independent system that is the target of the MG 100 to be connected to the power system 12B to the power system 12B. Here, the connection of the target area independent system may include an operation of transmitting a connection instruction to connect the target area independent system to the power system 12B by the section switch 191.

[0067] Here, a priority level (hereinafter, connection priority level) may be set for each MG 100. The connection priority level may be considered as the order in which MG 100 is connected to power system 12B by section switch 191 in a state in which MG 100 is disconnected from power system 12A by area switch 13 and MG 100 is disconnected from power system 12B by section switch 191.

[0068] For example, consider a case where MG100A, MG100B, and MG100C are present downstream of the area switch 13, and the connection priority of MG100A is higher than the connection priority of MG100B and MG100C, and the connection priority of MG100B is higher than the connection priority of MG100C. In such a case, after MG100A is connected to power system 12B, MG100B is connected to power system 12B, and after MG100B is connected to power system 12B, MG100C is connected to power system 12B.

[0069] Although not particularly limited, the same connection priority may be set for two or more MGs 100. In other words, two or more MGs 100 may be simultaneously connected to the power system 12B.

[0070] That is, control unit 330 may connect one or more MGs 100 to power system 12B in descending order of the connection priority levels of the one or more MGs 100.

[0071] Although not particularly limited, the control unit 330 may, instead of the control unit 153, execute a process of starting up a specific distributed power source selected from the distributed power sources 110 connected to one or more regional independent systems (MG100A to MG100C) using GFM when an area (MG100A to MG100C) is disconnected by the area switch 13.

[0072] Although not particularly limited, the control unit 330 may execute a process of starting up a specific dispersed power source using the GFM, instead of the control unit 153, and then starting up dispersed power sources other than the specific dispersed power source using the GFL.

[0073] (Example of operation) An operation example according to the embodiment will be described below. In the following, a case is assumed in which two or more MGs 100 exist in an area partitioned by an area switch 13 controlled by a management server 200 that manages the power system 12. A case in which a malfunction occurring in the power system 12 is a power outage will be illustrated.

[0074] As an initial state of the operation example shown below, a state is assumed in which two or more MGs 100 are connected to the power system 12A by the area switch 13, and each MG 100 is connected to the power system 12B by the sectional switch 191.

[0075] 5 and 6, MG 100A and MG 100B are shown as examples, but similar processing may be performed on MG 100 other than MG 100A and MG 100B (for example, MG 100C).

[0076] 5, in step S10, the management server 200 detects a power outage that occurs in the power system 12. The management server 200 controls the area switch 13 to disconnect the areas (MG100A to MG100C) from the power system 12A.

[0077] In step S11, the management server 200 transmits a power failure signal to each MG 100 (MG_EMS 150). The power failure signal may be transmitted to each MG 100 via MG 300, or may be transmitted to each MG 100 without passing through MG 300.

[0078] In step S12A, the MG 100A is disconnected from the power system 12B by the section switch 191. In step S12B, the MG 100B is disconnected from the power system 12B by the section switch 191. The section switch 191 may be controlled by the MG_EMS 150 or may be controlled by the MG server 300.

[0079] In step S13A, the specific distributed power source is started up in the GFM in the MG 100A. In step S13B, the specific distributed power source is started up in the GFM in the MG 100B. The specific distributed power source may be selected based on the start-up priority set for the distributed power source 110. The start-up of the specific distributed power source may be controlled by the MG_EMS 150 or the MG server 300.

[0080] In step S14A, MG_EMS 150 transmits a start-up notification indicating that the specific distributed power source in MG 100A has been started up to MG server 300. In step S14B, MG_EMS 150 transmits a start-up notification indicating that the specific distributed power source in MG 100B has been started up to MG server 300.

[0081] In step S15, the MG server 300 selects a target area independent system to be connected to the power system 12B. The MG server 300 may select the target area independent system based on the connection priority set in the MG 100. Here, a case where the connection priority of the MG 100A is the highest will be illustrated.

[0082] In step S16, the MG server 300 transmits a connection instruction to connect the MG 100A to the power system 12B via the section switch 191.

[0083] In step S17, the section switch 191 connects the MG 100A to the power system 12B.

[0084] In step S18, the MG_EMS 150 transmits to the MG server 300 a connection notification indicating that the MG 100A has been connected to the power system 12B.

[0085] As shown in Fig. 6, in step S20, the MG server 300 selects a target area independent system to be connected to the power system 12B. The MG server 300 may select the target area independent system based on the connection priority set in the MG 100. Here, a case where the connection priority of the MG 100B is the second highest will be illustrated.

[0086] In step S21, the MG server 300 transmits a connection instruction to connect the MG 100B to the power system 12B via the section switch 191.

[0087] In step S22, MG_EMS 150 monitors at least one parameter of the voltage, phase, and frequency of the power system 12B. MG_EMS 150 adjusts a parameter of the power line 14 of MG 100B so as to match the monitored parameter. Adjustment of the parameter of the power line 14 may be realized by adjusting the output power of the specific distributed power source activated by GFM.

[0088] In step S23, the section switch 191 connects the MG 100B to the power system 12B.

[0089] In step S24, the MG_EMS 150 transmits to the MG server 300 a connection notification indicating that the MG 100B has been connected to the power system 12B.

[0090] In step S30, the MG server 300 transmits to each MG 100 (MG_EMS 150) a start-up instruction to instruct start-up of the distributed power sources other than the specific distributed power source.

[0091] In step S31A, the MG 100A starts up the distributed power sources other than the specific distributed power source in the GFL. In step S31B, the MG 100B starts up the distributed power sources other than the specific distributed power source in the GFL. The distributed power sources other than the specific distributed power source may be selected based on the start-up priority set in the distributed power sources 110. The start-up of the distributed power sources other than the specific distributed power source may be controlled by the MG_EMS 150 or the MG server 300.

[0092] In step S32A, MG_EMS 150 transmits a start-up notification indicating that a distributed power source other than the specific distributed power source has been started in MG 100A to MG server 300. In step S32B, MG_EMS 150 transmits a start-up notification indicating that a distributed power source other than the specific distributed power source has been started in MG 100B to MG server 300.

[0093] In the operation example, the operations completed by each MG 100 (e.g., step S12A, step S12B, step S13A, step S13B, step S17, step S22, step S23, step 31A, step S31B, etc.) are illustrated as being executed by MG_EMS 150 without control of MG server 300. However, the above-mentioned operation example is not limited to this. At least a part of the operations completed by each MG 100 may be executed by MG server 300, or may be executed by MG_EMS 150 under the control of MG server 300.

[0094] (Action and Effects) In the embodiment, when an area (MG100A to MG100C) is disconnected by the area switch 13, the MG_EMS 150 (or the MG server 300) may start a specific distributed power source selected from the distributed power sources 110 connected to one or more MG100 (MG100A to MG100C) by GFM. With this configuration, even when an area (MG100A to MG100C) is disconnected by the area switch 13 and a reference power system (voltage, phase, or frequency) does not exist, the specific distributed power source to be started by GFM is selected, so that the distributed power sources 110 of the MG100 can be appropriately started. Furthermore, by starting all the distributed power sources 110 at the same time, problems associated with unevenness in voltage, phase, or frequency of the power system 12B or the power line 14 can be avoided.

[0095] Specifically, by starting a specific distributed power source selected from the distributed power sources 110 in a GFM (voltage control mode), the power output from the specific distributed power source can be used as a reference waveform (voltage, phase, or frequency). In other words, a distributed power source other than the specific distributed power source can be started in a GFL (current control mode) by following the reference waveform (voltage, phase, or frequency) output from the specific distributed power source started in a GFM.

[0096] In the embodiment, the MG server 300 may connect a target area independent system selected from one or more MGs 100 to the power system 12B after starting the specific distributed power source with the GFM. With this configuration, when a case is assumed in which two or more MGs 100 exist in an area by the area switch 13, the MG 100 can be appropriately connected to the power system 12B by selecting a target area independent system to be connected to the power system 12B.

[0097] In an embodiment, the MG_EMS 150 (or the MG server 300) may adjust the parameters of the power line 14 of the MG 100 so as to match at least one of the parameters of the voltage, phase, and frequency of the power system 12B after connecting the target area independent system to the power system 12B. With this configuration, when the MG 100 is additionally connected to the power system 12B, the MG 100 can be appropriately connected to the power system 12B, and power can be appropriately exchanged between the MGs 100.

[0098] In the embodiment, the MG_EMS 150 (or the MG server 300) may start up a specific distributed power source using the GFM, and then start up a distributed power source other than the specific distributed power source using the GFL. With this configuration, it is possible to effectively use a conventional distributed power source that is started up using the GFL.

[0099] [Change Example 1] Modification 1 of the embodiment will be described below. Differences from the embodiment will be mainly described below.

[0100] The specific distributed power source will be described in detail in Modification 1. The specific distributed power source is a distributed power source 110 including a PCS that can be started up by the GFM.

[0101] The specific distributed power source may be a distributed power source 110 having a PCS with the largest output capacity in GFM mode in the MG 100. The start-up priority may be set in descending order of the output capacity of the PCS operating in GFM mode. The output capacity may be expressed by apparent power [VA] instead of power [W]. With this configuration, the larger the reactive power supply capacity (consumable capacity or supply capacity) of the distributed power source 110 is, the more it can contribute to stabilizing the power supply of the distributed power source 110.

[0102] If there is a PCS that can be connected in GFM mode in MG 100, a combination of dispersed power sources 110 having PCSs that can be connected in GFM mode may be selected as the specific dispersed power source. In such a case, a combination of dispersed power sources 110 having the largest total output capacity of PCSs that can be connected in GFM mode may be selected as the specific dispersed power source. The startup priority may be set in descending order of the total output capacity of one PCS that is not connected in GFM mode and the output capacity of PCSs that can be connected in GFM mode.

[0103] Here, the PCSs that can be interconnected in the GFM mode may be PCSs of a type that can be activated simultaneously, or may be PCSs of a type that are activated sequentially and synchronously.

[0104] [Change Example 2] Modification 2 of the embodiment will be described below. Differences from the embodiment will be mainly described below.

[0105] In the embodiment, a case has been described in which a specific distributed power source is started up in GFM in each of two or more MGs 100. In contrast, in Modification 2, a case will be described in which a specific distributed power source is started up in GFM in at least one of two or more MGs 100.

[0106] The MG100 having a specific distributed power source that operates in GFM may be referred to as a specific area independent system. The specific area independent system may be one or more. In such a case, the specific distributed power source may be a distributed power source 110 having a PCS that can be connected in GFM mode within the MG100.

[0107] (Example of operation) An operation example according to the modified example 2 will be described below. In the following, a case is assumed in which two or more MGs 100 exist in an area partitioned by an area switch 13 controlled by a management server 200 that manages the power system 12. Note that a case in which a malfunction occurring in the power system 12 is a power outage will be illustrated.

[0108] As an initial state of the operation example shown below, a state is assumed in which two or more MGs 100 are connected to the power system 12A by the area switch 13, and each MG 100 is connected to the power system 12B by the sectional switch 191.

[0109] 7 and 8, MG 100A and MG 100B are shown as examples, but similar processing may be performed for MG 100 other than MG 100A and MG 100B (for example, MG 100C).

[0110] 7, in step S40, the management server 200 detects a power outage that occurs in the power system 12. The management server 200 controls the area switch 13 to disconnect the areas (MG100A to MG100C) from the power system 12A.

[0111] In step S41, the management server 200 transmits a power failure signal to each MG 100 (MG_EMS 150). The power failure signal may be transmitted to each MG 100 via MG 300, or may be transmitted to each MG 100 without passing through MG 300.

[0112] In step S42A, the MG 100A is disconnected from the power system 12B by the section switch 191. In step S42B, the MG 100B is disconnected from the power system 12B by the section switch 191. The section switch 191 may be controlled by the MG_EMS 150 or may be controlled by the MG server 300.

[0113] In step S43, the MG server 300 selects a target area independent system to be connected to the power system 12B. The MG server 300 may select the target area independent system based on the connection priority set in the MG 100. Here, a case where the connection priority of the MG 100A is the highest will be illustrated.

[0114] In step S44, the MG server 300 transmits a start-up instruction to each MG 100A (MG_EMS 150) to instruct the specific distributed power source to start up.

[0115] In step S45, the specific dispersed power source to be started up in the MG 100A using the GFM may be selected based on the start-up priority set for the dispersed power source 110.

[0116] In step S46, the MG_EMS 150 transmits to the MG server 300 a start-up notification indicating that the specific distributed power source in the MG 100A has been started up.

[0117] In step S47, the MG server 300 transmits a connection instruction to connect the MG 100A to the power system 12B via the section switch 191.

[0118] In step S48, the section switch 191 connects the MG 100A to the power system 12B.

[0119] In step S49, the MG_EMS 150 transmits to the MG server 300 a connection notification indicating that the MG 100A has been connected to the power system 12B.

[0120] As shown in Fig. 8, in step S50, the MG server 300 selects a target area independent system to be connected to the power system 12B. The MG server 300 may select the target area independent system based on the connection priority set in the MG 100. Here, a case in which the connection priority of the MG 100B is the second highest will be illustrated.

[0121] In step S51, the MG server 300 transmits to each MG 100B (MG_EMS 150) a connection instruction for connecting the MG 100B to the power system 12B via the section switch 191 and a start instruction for instructing start-up of the distributed power sources other than the specific distributed power source.

[0122] In step S52, the section switch 191 connects the MG 100B to the power system 12B.

[0123] In step S53, the dispersed power sources 110 in the MG 100B are started up by the GFL. In the second modification, the dispersed power sources 110 started up by the GFL may be all dispersed power sources 110 connected to the MG 100B.

[0124] In step S54, the MG_EMS 150 transmits to the MG server 300 a connection notification indicating that the MG 100B has been connected to the power system 12B and a start-up notification indicating that the distributed power source 110 has been started up.

[0125] In the second modification, the specific area independent system may be an MG 100 having a PCS with the largest output capacity in GFM mode in each of two or more MGs 100. If there is a PCS that can be connected in GFM mode, the output capacity of the PCS operating in GFM mode may be interpreted as the total output capacity of the PCS that can be connected in GFM mode. If a PCS spanning two or more MGs 100 can be connected in GFM mode, two or more MGs 100 may be selected as the specific area independent system.

[0126] [Change Example 3] The third modification of the embodiment will be described below. Differences from the embodiment will be mainly described below.

[0127] In modified example 3, an explanation will be given of the difference between operation example 1 (embodiment) in which a specific distributed power source is started up in GFM in each of two or more MG100, and operation example 2 (modified example 2) in which a specific distributed power source is started up in GFM in a specific regional independent system selected from two or more MG100.

[0128] First, in the MG 100 that is second or later connected to the power system 12B, if the distributed power source 110 that can be started up by GFM has a function of adjusting at least one parameter of the voltage, phase, and frequency of the power system 12B (hereinafter, adjustment function), the operation example 1 (embodiment) may be applied. On the other hand, in the MG 100 that is second or later connected to the power system 12B, if the distributed power source 110 that can be started up by GFM does not have the adjustment function, the operation example 2 (modified example 2) may be applied.

[0129] Secondly, the second operation example (second modification example) may be applied when the total amount of power consumption taking into consideration the past power factors of the MGs 100 partitioned by the area switch 13 is smaller than the total amount of reactive power supply capacity of the specific distributed power sources in the specific area independent system. When the total amount of power consumption taking into consideration the past power factors of the MGs 100 partitioned by the area switch 13 is larger than the total amount of reactive power supply capacity of the specific distributed power sources in the specific area independent system, an operation of linking each MG 100 to the power system 12B is not performed, and each MG 100 may be operated independently without linking it to the power system 12B.

[0130] Thirdly, in the MG100 partitioned by the area switch 13, when the output capacity of the distributed power source (PCS) that can be activated by GFM satisfies a specific condition, the operation example 1 (embodiment) or the operation example 2 (modification example 2) may be applied. For example, the specific condition may be a condition that the ratio of the output capacity of the distributed power source (PCS) that can be activated by GFM to the output capacity of all the distributed power sources (PCS) is a predetermined ratio (e.g., 80%) or more. When the specific condition is satisfied, the operation example 1 (embodiment) or the operation example 2 (modification example 2) is applied, and when the specific condition is not satisfied, each MG100 may be operated independently without being connected to the power system 12B.

[0131] [Other embodiments] Although the present invention has been described by the above-mentioned embodiment, the description and drawings forming a part of this disclosure should not be understood as limiting the present invention. From this disclosure, various alternative embodiments, examples and operating techniques will become apparent to those skilled in the art.

[0132] Although not specifically mentioned in the above disclosure, the order in which the distributed power sources 110 are started up by the GFL may be determined based on the start-up priority set for the distributed power sources 110 .

[0133] In the above disclosure, the power supply control device that controls the distributed power supply 110 may be the MG server 300, may be the MG_EMS 150, or may be a combination of the MG_EMS 150 and the MG server 300.

[0134] Although not specifically mentioned in the above disclosure, a case may be assumed in which a load is connected to the distributed power source 110 when the distributed power source 110 performs an independent operation.

[0135] Although not specifically mentioned in the above disclosure, whether or not a malfunction occurs in the MG 100 may be automatically determined by monitoring the voltage of the power line 14.

[0136] Although not specifically mentioned in the above disclosure, whether or not a malfunction has occurred in power system 12B due to the interconnection of MG 100 may be automatically determined by monitoring the voltage of power system 12B.

[0137] Although not specifically mentioned in the above disclosure, a program may be provided that causes a computer to execute each process performed by the MG_EMS 150, the management server 200, or the MG server 300. The program may also be recorded in a computer-readable medium. Using the computer-readable medium, it is possible to install the program in the computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

[0138] Alternatively, a chip may be provided that is configured by a memory that stores a program for executing each process performed by the MG_EMS 150, the management server 200, or the MG server 300, and a processor that executes the program stored in the memory.

[0139] [Note] The above disclosure may be expressed as follows:

[0140] The first feature is that the system is a distributed power source control system comprising two or more distributed power sources connected to one or more regional independent power sources in an area partitioned by an area switch controlled by a management server that manages the power system, and a power source control device that controls the distributed power sources, wherein when the area is disconnected by the area switch, the power source control device starts up a specific distributed power source selected from the two or more distributed power sources using a voltage control method.

[0141] A second feature is a distributed power supply control system in which, in the first feature, the power supply control device selects the specific distributed power supply for each of the one or more regional independent systems when each of the one or more regional independent systems is disconnected from the power system.

[0142] A third feature is that in the second feature, the power supply control device is configured to start up the two or more distributed power sources in order of priority set for the two or more distributed power sources when each of the one or more regional independent systems is disconnected from the power grid.

[0143] A fourth feature is a distributed power supply control system in which, in at least one of the first to third features, the power supply control device connects a target regional independent system selected from the one or more regional independent systems to the power system after starting up the specific distributed power supply using a voltage control method.

[0144] A fifth feature is that in the fourth feature, the power supply control device is a distributed power supply control system that connects the one or more regional independent systems to the power system in order of priority of the one or more regional independent systems.

[0145] A sixth feature is a distributed power supply control system in which, in at least one of the first to fifth features, the power supply control device starts up the specific distributed power supply using a voltage control method, and then starts up distributed power supplies other than the specific distributed power supply using a current control method.

[0146] A seventh feature is a power supply control device that controls two or more distributed power sources connected to one or more regional independent power systems in an area partitioned by an area switch controlled by a management server that manages the power system, and that includes a control unit that starts up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch.

[0147] An eighth feature is a distributed power source control method, comprising a step of a power source control device that controls two or more distributed power sources connected to one or more regional independent systems in an area partitioned by an area switch controlled by a management server that manages the power system, starting up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch. [Explanation of symbols]

[0148] 1... Distributed power supply control system, 10... Substation, 12... Power system, 13... Area switch, 100... MG, 110... Distributed power supply, 111... Power supply, 112... PCS, 121... Switch, 130... Load, 131... Switch, 150... MG_EMS, 151... Communication unit, 152... Management unit, 153... Control unit, 191... Section switch, 192... TTS, 200... Management server, 300... MG server, 310... Communication unit, 320... Management unit, 330... Control unit

Claims

1. Two or more distributed power sources connected to one or more regional independent grids in an area partitioned by an area switch controlled by a management server that manages the power grid; a power supply control device that controls the distributed power supply, The power supply control device is a distributed power supply control system that starts up a specific distributed power supply selected from the two or more distributed power supplies using a voltage control method when the area is disconnected by the area switch.

2. 2. The distributed power supply control system according to claim 1, wherein the power supply control device selects the specific distributed power supply for each of the one or more regional independent systems when each of the one or more regional independent systems is disconnected from the power system.

3. 3. The distributed power supply control system according to claim 2, wherein the power supply control device starts up the two or more distributed power sources in order of the highest priority set for the two or more distributed power sources when each of the one or more regional independent systems is disconnected from the power grid.

4. 2. The distributed power supply control system according to claim 1, wherein the power supply control device connects a target regional independent system selected from the one or more regional independent systems to the power system after starting up the specific distributed power supply using a voltage control method.

5. 5. The distributed power supply control system according to claim 4, wherein the power supply control device connects the one or more regional independent systems to the power system in descending order of priority of the one or more regional independent systems.

6. 2. The distributed power supply control system according to claim 1, wherein the power supply control device starts up the specific distributed power supply by a voltage control method, and then starts up the distributed power supplies other than the specific distributed power supply by a current control method.

7. A power supply control device that controls two or more distributed power sources connected to one or more regional independent power systems in an area partitioned by an area switch controlled by a management server that manages a power system, a control unit that starts up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch.

8. A distributed power source control method comprising a step of a power source control device that controls two or more distributed power sources connected to one or more regional independent systems in an area partitioned by an area switch controlled by a management server that manages the power system, starting up a specific distributed power source selected from the two or more distributed power sources using a voltage control method when the area is disconnected by the area switch.

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