Dispersion power supply controlling system, power supply controlling device, and dispersion power supply controlling method

Abstract

To provide a dispersion power supply controlling system, a power supply controlling device, and a dispersion power supply controlling method capable of effectively utilizing a specific dispersion power supply in an area independent system.SOLUTION: A dispersion power supply controlling system comprises a dispersion power supply connected to an are independent system, a specific dispersion power supply connected to the area independent system, a transfer blocking device for linking the specific power supply with the area independent system, or paralleling off the specific dispersion power supply from the area independent system. The specific dispersion power supply is configured to be paralleled off from the area independent system according to parallel-off signals outputted from an administrative server administering a power system when failure is detected in the power system connected to the area independent system. The power supply controlling device comprises a control part for linking the specific dispersion power supply with the area independent system regardless of the parallel-off signals when the failure is not detected in the area independent system.SELECTED DRAWING: Figure 2

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, fuel cell devices, etc. has been attracting attention. For example, when a power supply system including a load and a distributed power supply is connected to a power system, if a failure in the power system such as a power outage occurs, a technique has been proposed to disconnect the power supply system from the power system (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-6986 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, a power supply system may be a regional independent system (so-called microgrid) connected to a power grid. A specific distributed power source that is disconnected from the regional independent system by a general electricity transmission and distribution company when a power grid malfunction such as a power outage occurs is assumed as a distributed power source installed in the regional independent system. The distributed power sources installed in the regional independent system may include distributed power sources other than the specific distributed power sources, which are not assumed to be controlled by the general electricity transmission and distribution company to be disconnected from or connected to the regional independent system.

[0005] Because such specific distributed power sources are disconnected from the regional independent grid by the general electricity transmission and distribution company, even if there is no malfunction in the regional independent grid that has been disconnected from the power grid, the specific distributed power source cannot be connected to the regional independent grid, and the specific distributed power source cannot be used effectively.

[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 effective utilization of specific distributed power supplies in a regional independent system. [Means for solving the problem]

[0007] One aspect of the disclosure is a distributed power supply control system comprising: a distributed power supply connected to a regional independent system; a specific distributed power supply connected to the regional independent system; a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system; and a power supply control device that controls the distributed power supplies, wherein the specific distributed power supply is configured to be disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in a power system connected to the regional independent system, and the power supply control device comprises a control unit that connects the specific distributed power supply to the regional independent system without the disconnection signal when no malfunction is detected in the regional independent system.

[0008] One aspect of the disclosure is a power supply control device for use in a distributed power supply control system including a distributed power supply connected to a regional independent system, a specific distributed power supply connected to the regional independent system, and a transfer cut-off device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system, wherein the specific distributed power supply is configured to be disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in a power system connected to the regional independent system, and the power supply control device includes a control unit that connects the specific distributed power supply to the regional independent system without the disconnection signal when no malfunction is detected in the regional independent system.

[0009] One aspect of the disclosure is a distributed power supply control method used in a distributed power supply control system including a distributed power supply connected to a regional independent system, a specific distributed power supply connected to the regional independent system, and a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system, the distributed power supply control method including: a step A in which a management server managing a power system connected to the regional independent system outputs a disconnection signal to disconnect the specific distributed power supply from the regional independent system when a malfunction is detected in the power system; and a step B in which a power supply control device controlling the distributed power supplies connects the specific distributed power supply to the regional independent system without using the disconnection signal when no malfunction is detected in the regional independent system. 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 effective use of a specific distributed power supply in a regional independent grid. [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 management server 200 according to the embodiment. [Diagram 5] FIG. 5 is a diagram showing an MG 100 according to the first modified example. [Figure 6] FIG. 6 is a diagram showing an MG 100 according to the second modified example. [Figure 7] FIG. 7 is a diagram showing an MG 100 according to the third modified example. 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, and may also include a management server 200. 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 is connected to the power system 12 between the area switch 13A and the area switch 13B. MG100B is connected to the power system 12 between the area switch 13B and the area switch 13C. MG100C is connected to the power system 12 downstream of the area switch 13C. Note that downstream may be considered as a term indicating the side away from the substation 10. Details of MG100 will be described later (see Fig. 2).

[0018] 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, MG_EMS 150 described later) installed in the MG 100. Hereinafter, the management server 200 may also be referred to as a general electricity transmission and distribution business operator. Details of the management server 200 will be described later (see FIG. 4).

[0019] 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).

[0020] (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 cutoff function (hereinafter, TTS) 192. The MG 100 further includes a specific distributed power source 170, a transfer cutoff device 181, and a TTS 182.

[0021] 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. If the power source 111 is a power storage device, the PCS 112 converts the input voltage of the power storage device.

[0022] In FIG. 2, the distributed power source 110 is 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] In the embodiment, the MG_EMS 150 is an example of a power supply control device that controls the distributed power supplies 110 .

[0029] The specific distributed power source 170 is connected to the power line 14 in the MG 100. The power line 14 may be referred to as an area independent system. The specific distributed power source 170 has a power source 171 and a PCS 172. The power source 171 may be a solar cell device, a power storage device, a fuel cell device, or other power generation device. The PCS 172 converts the output voltage of the power source 171. When the power source 171 is a power storage device, the PCS 172 converts the input voltage of the power storage device.

[0030] Here, the connection and disconnection of the above-mentioned distributed power source 110 is controlled by the MG_EMS 150, not by the management server 200. The connection and disconnection of the distributed power source 110 may be interpreted as being controlled within the MG 100. On the other hand, the connection and disconnection of the specific distributed power source 170 is controlled by the management server 200, not by the MG_EMS 150. The connection and disconnection of the specific distributed power source 170 may be interpreted as being controlled from outside the MG 100.

[0031] For example, the distributed power source 110 may be a distributed power source that is installed after the MG 100 is constructed (after the MG_EMS 150 is installed). On the other hand, the specific distributed power source 170 may be a distributed power source that is installed before the MG 100 is constructed (before the MG_EMS 150 is installed).

[0032] The specified distributed power sources are distributed power sources whose connection to or disconnection from the power grid 12 or power lines 14 is controlled by the management server 200. One of the purposes of disconnecting is to ensure safety, such as by investigating the cause of a power outage when a malfunction such as a power outage occurs in the power grid 12 or power lines 14. Some of the specified distributed power sources are distributed power sources that do not have the function of detecting a power outage in the grid and automatically disconnecting from the power grid 12 or power lines 14 to prevent isolated operation. Some of the specified distributed power sources connect to or disconnect from the high-voltage power grid 12 or power lines 14. Some of the specified distributed power sources may include distributed power sources installed in relatively large facilities or equipment.

[0033] The distributed power sources 110 other than the specified distributed power sources are distributed power sources whose connection to or disconnection from the power grid 12 or power lines 14 is not controlled by the management server 200. Some of the distributed power sources 110 other than the specified distributed power sources are distributed power sources that have a function of detecting a power outage in the grid and automatically disconnecting from the power grid 12 or power lines 14 to prevent islanding. Some of the distributed power sources 110 other than the specified distributed power sources are connected to or disconnected from the low-voltage power grid 12 or power lines 14. Some of the distributed power sources 110 other than the specified distributed power sources may include solar cell devices.

[0034] The transfer cutoff device 181 is disposed between the specific distributed power source 170 and the power line 14. The transfer cutoff device 181 connects the specific distributed power source 170 to the power line 14 or disconnects the specific distributed power source 170 from the power line 14.

[0035] The TTS 182 receives a disconnection signal from the management server 200 to disconnect the specific distributed power source 170 from the power line 14. The TTS 182 controls the transfer cutoff device 181 in response to the disconnection signal to disconnect the specific distributed power source 170 from the power line 14. The TTS 182 may receive a grid connection signal from the management server 200 to connect the specific distributed power source 170 to the power line 14. The TTS 182 may control the transfer cutoff device 181 in response to the grid connection signal to connect the specific distributed power source 170 to the power line 14.

[0036] The section switch 191 is disposed between the power system 12 and the MG 100 (the power line 14). The section switch 191 connects the MG 100 to the power system 12 or disconnects the MG 100 from the power system 12.

[0037] The TTS 192 receives a disconnection signal from the MG_EMS 150 to disconnect the MG 100 from the power grid 12. The TTS 192 controls the sectional switch 191 in response to the disconnection signal to disconnect the MG 100 from the power grid 12. The TTS 192 may receive a grid connection signal from the MG_EMS 150 to connect the MG 100 to the power grid 12. The TTS 192 may control the sectional switch 191 in response to the grid connection signal to connect the MG 100 to the power grid 12.

[0038] 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.

[0039] Here, the grid-connected operation of the distributed power source 110 may include a specific grid-connected operation in a state where the MG 100 is connected to the power grid 12 and the distributed power source 110 is connected to the power line 14. A state where the distributed power source 110 operates in the specific grid-connected operation within the MG 100 may be referred to as an independent operation of the MG 100. The grid-connected operation of the distributed power source 110 may include an operation in a state where the MG 100 is disconnected from the power grid 12 and the distributed power source 110 is connected to the power line 14.

[0040] 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 grid 12 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 grid 12 and the distributed power source 110 is disconnected from the power line 14.

[0041] (Power supply control device) The power supply control device (MG_EMS) according to the embodiment will be described below. As shown in FIG.

[0042] 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.

[0043] For example, the communication unit 151 communicates with the distributed power source 110. The communication unit 151 transmits a control command for controlling the distributed power source 110 to the distributed power source 110. The communication unit 151 may also communicate with the management server 200.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In the embodiment, the control unit 153 constitutes a control unit that connects the specific distributed power source 170 to the MG 100 (power line 14) without relying on a disconnection signal transmitted from the management server 200 to the TTS 182 when no malfunction is detected in the MG 100.

[0048] Specifically, when no malfunction is detected in MG 100, the control unit 153 generates a connection signal for connecting the specific distributed power source 170 to MG 100 (power line 14) as a signal that has priority over a disconnection signal transmitted from the management server 200 to the TTS 182. The control unit 153 executes control to transmit a connection signal for connecting the specific distributed power source 170 to MG 100 (power line 14) as a signal that has priority over a disconnection signal transmitted from the management server 200 to the TTS 182. That is, the control unit 153 instructs the communication unit 151 to transmit the connection signal to the TTS 182, and the communication unit 151 transmits the connection signal to the TTS 182.

[0049] For example, the TTS 182 may include an AND circuit. A signal transmitted from the management server 200 (hereinafter, management server signal) and a signal transmitted from the MG_EMS 150 (hereinafter, EMS signal) are input to the AND circuit. The AND circuit outputs a parallel-off signal when both the management server signal and the EMS signal are parallel-off signals, and outputs a connection signal in other cases. In such a case, the management server signal and the EMS signal may be the signals shown below.

[0050] The management server signal is a grid connection signal that closes the transfer cutoff device 181 when no malfunction occurs in the power system 12. The management server signal is a parallel-off signal that opens the transfer cutoff device 181 when a malfunction occurs in the power system 12. The management server signal is a parallel-off signal that opens the transfer cutoff device 181 when a malfunction occurs in the power system 12 but not in the MG 100.

[0051] The EMS signal is a parallel-off signal that opens the transfer cut-off device 181 when there is no malfunction in the power system 12. The EMS signal is a parallel-off signal that opens the transfer cut-off device 181 when there is a malfunction in the power system 12. The EMS signal is a parallel-off signal that closes the transfer cut-off device 181 when there is a malfunction in the power system 12 but not in the MG 100.

[0052] In this way, when a malfunction occurs in the power system 12 but not in the MG100, i.e., when independent operation of the MG100 is permitted, the EMS signal takes priority over the management server signal, and is an example of an interconnection signal that connects the specific distributed power source 170 to the MG100 (power line 14).

[0053] In the embodiment, the case where the TTS 182 includes an AND circuit is illustrated, but the embodiment is not limited to this.

[0054] (Management Server) The management server according to the embodiment will be described below. As shown in FIG.

[0055] The communication unit 210 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.

[0056] For example, when a malfunction such as a power outage occurs in the power system 12, the communication unit 210 may transmit to the area switch 13 a signal for switching all the area switches 13 to the open state. When the malfunction such as a power outage in the power system 12 is resolved, the communication unit 210 may transmit to the area switch 13 a signal for switching all the area switches 13 to the closed state. When the position of the malfunction such as a power outage in the power system 12 is identified, the communication unit 210 may transmit to the area switch 13 a signal for switching the area switches 13 that are not affected by the malfunction to the closed state.

[0057] For example, when a malfunction such as a power outage occurs in the power system 12, the communication unit 210 may transmit to the TTS 182 a signal to switch the transfer cutoff device 181 to an open state. When the malfunction such as a power outage is resolved in the power system 12, the communication unit 210 may transmit to the TTS 182 a signal to switch the transfer cutoff device 181 to a closed state. When the position of the malfunction such as a power outage in the power system 12 is identified, the communication unit 210 may transmit to the TTS 182 a signal to switch the transfer cutoff device 181 that is not affected by the malfunction to a closed state.

[0058] That is, the management server 200 is configured to output a disconnection signal for disconnecting the specific distributed power source 170 from the MG 100 when a malfunction is detected in the power grid 12.

[0059] The management unit 220 is configured with a storage medium such as a hard disk drive (HDD), a solid state drive (SSD), or a non-volatile memory.

[0060] For example, the management unit 220 may manage the state of the power system 12. The path of the power system 12 and the state of the power system 12 may include whether or not a malfunction has occurred in the power system 12, the location of the malfunction occurring in the power system 12, and the like. The management unit 220 may manage location information that specifies the location of the MG 100.

[0061] The control unit 230 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.

[0062] For example, the control unit 230 may detect a malfunction such as a power outage occurring in the power grid 12. The control unit 230 may determine whether or not to permit independent operation of the MG 100 based on the state of the MG 100 included in the permission request.

[0063] For example, when the position of a malfunction occurring in power system 12 is identified, control unit 230 may determine whether or not to connect MG 100 that is not affected by the malfunction to power system 12. In such a case, control unit 230 may determine whether or not to connect MG 100 to power system 12, based on the position of the malfunction occurring in power system 12 and the position of MG 100 included in the permission request.

[0064] (Example of operation) An example of the operation of the embodiment will be described below.

[0065] First, the operation in the case where a malfunction occurs in the power grid 12 will be described.

[0066] In stage 1-1, no malfunction occurs in the power system 12, and the section switch 191 and the transfer cutoff device 181 are in the closed state.

[0067] In stage 1-2, a malfunction occurs in the power system 12, the section switch 191 is switched to the open state, and a parallel-off signal is transmitted from the management server 200 to the TTS 182 as a management server signal.

[0068] In step 1-3, the transfer cutoff device 181 switches to an open state, i.e., both the management server signal and the EMS signal are de-paralleling signals.

[0069] In steps 1-4, it is detected that no malfunction has occurred in MG 100, and MG_EMS 150 starts the independent operation of MG 100. Note that when it is detected that a malfunction has occurred in MG 100, MG_EMS 150 does not start the independent operation of MG 100 even if the malfunction of power grid 12 has been resolved or even if it is detected that no malfunction has occurred in power grid 12.

[0070] In steps 1-5, the MG_EMS 150 transmits the interconnection signal to the TTS 182 as an EMS signal.

[0071] In stage 1-6, the transfer cutoff device 181 is switched to the closed state. That is, the independent operation of the MG 100 including the specific dispersed power source 170 starts.

[0072] Secondly, the operation in the case where the malfunction in the power grid 12 is resolved will be described.

[0073] In stage 2-1, the MG_EMS 150 stops the operations of the distributed power sources 110 and the specific distributed power sources 170.

[0074] In step 2-2, the MG_EMS 150 transmits a de-paralleling signal as an EMS signal to the TTS 182.

[0075] In phase 2-3, the transfer cutoff device 181 switches to an open state.

[0076] In step 2-4, the section switch 191 is switched to the closed state.

[0077] In step 2-5, the management server 200 transmits a connection signal to the TTS 182 as a management server signal.

[0078] In step 2-6, the transfer cutoff device 181 is switched to the closed state. That is, the management server signal is a grid-connection signal, and the EMS signal is a parallel-off signal.

[0079] (Action and Effects) In the embodiment, when no malfunction is detected in the MG 100, the MG_EMS 150 transmits a connection signal for connecting the specific distributed power source 170 to the MG 100 (power line 14) as a signal that takes priority over a parallel-off signal transmitted from the management server 200 to the TTS 182. With this configuration, even in a case where the MG_EMS 150 cannot directly control the specific distributed power source 170, it is possible to realize independent operation of the MG 100 including the specific distributed power source 170, and the specific distributed power source 170 can be effectively utilized in the MG 100.

[0080] For example, under the premise that a specific distributed power source 170 is installed before MG100 is configured (before MG_EMS150 is installed) and whether or not the specific distributed power source 170 is connected to MG100 is controlled by the management server 200, independent operation of the MG100 including the specific distributed power source 170 can be realized, which is useful in that the specific distributed power source 170 can be effectively utilized in the MG100.

[0081] [Change Example 1] Modification 1 of the embodiment will be described below. Differences from the embodiment will be mainly described below.

[0082] In an embodiment, when no malfunction is detected in MG100, MG_EMS150 transmits a connection signal to connect the specific distributed power source 170 to MG100 (power line 14) as a signal that takes priority over the disconnection signal transmitted from the management server 200 to TTS182.

[0083] In contrast, in modification example 1, as shown in FIG. 5, the transfer cut-off device that performs connection / disconnection of the specific distributed power source 170 includes a first transfer cut-off device 181A and a second transfer cut-off device 181B that are installed electrically in parallel to the specific distributed power source 170.

[0084] The first transfer cutoff device 181A is configured to operate in response to a signal (eg, a disconnection signal) transmitted from the management server 200. The second transfer cutoff device 181B is configured to operate in response to a signal transmitted from the MG_EMS 150.

[0085] When no malfunction is detected in the MG 100, the MG_EMS 150 (control unit 153) connects the specific distributed power source 170 to the MG 100 (power line 14) by the second transfer cutoff device 181B.

[0086] Specifically, when no malfunction occurs in the power system 12, the control unit 153 generates a signal to open the second transfer cutoff device 181B and instructs the communication unit 151 to transmit the generated signal to the second transfer cutoff device 181B. When a malfunction occurs in the power system 12 but not in the MG 100, the control unit 153 generates a signal to close the second transfer cutoff device 181B and instructs the communication unit 151 to transmit the generated signal to the second transfer cutoff device 181B. When a malfunction occurs in the MG 100, the control unit 153 generates a signal to open the second transfer cutoff device 181B and instructs the communication unit 151 to transmit the generated signal to the second transfer cutoff device 181B.

[0087] (Example of operation) An operation example of the first modification will be described below.

[0088] First, the operation in the case where a malfunction occurs in the power grid 12 will be described.

[0089] In stage 1-1, no malfunction occurs in the power system 12, and the section switch 191 and the first transfer cutoff device 181A are in a closed state. The second transfer cutoff device 181B is in an open state.

[0090] In stage 1 - 2 , a malfunction occurs in the power system 12 , the section switch 191 is switched to the open state, and a parallel-off signal is transmitted from the management server 200 to the TTS 182 .

[0091] In step 1-3, the first transfer cutoff device 181A switches to an open state.

[0092] In steps 1-4, it is detected that no malfunction has occurred in MG100, and MG_EMS150 starts independent operation of MG100.

[0093] In step 1-5, the MG_EMS 150 transmits a connection signal to the second transfer cutoff device 181B.

[0094] In stage 1-6, the second transfer cutoff device 181B is switched to the closed state. That is, the independent operation of the MG 100 including the specific distributed power source 170 starts.

[0095] Secondly, the operation in the case where the malfunction in the power grid 12 is resolved will be described.

[0096] In stage 2-1, the MG_EMS 150 stops the operations of the distributed power sources 110 and the specific distributed power sources 170.

[0097] In step 2-2, the MG_EMS 150 transmits a disconnection signal to the second transfer cutoff device 181B.

[0098] In phase 2-3, the second transfer cutoff device 181B switches to an open state.

[0099] In step 2-4, the section switch 191 is switched to the closed state.

[0100] In step 2 - 5 , the management server 200 transmits a connection signal to the TTS 182 .

[0101] In step 2-6, the transfer cutoff device 181 switches to a closed state.

[0102] (Action and Effects) In the first modification, the MG_EMS 150 connects the specific distributed power source 170 to the MG 100 (power line 14) by the second transfer cutoff device 181B when no malfunction is detected in the MG 100. With this configuration, even in a case where the MG_EMS 150 cannot directly control the specific distributed power source 170, it is possible to realize independent operation of the MG 100 including the specific distributed power source 170, and the specific distributed power source 170 can be effectively utilized in the MG 100.

[0103] [Change Example 2] Modification 2 of the embodiment will be described below. Differences from the embodiment will be mainly described below.

[0104] In an embodiment, when no malfunction is detected in MG100, MG_EMS150 transmits a connection signal to connect the specific distributed power source 170 to MG100 (power line 14) as a signal that takes priority over the disconnection signal transmitted from the management server 200 to TTS182.

[0105] In contrast, in the second modification, as shown in FIG. 6, a signal (for example, a de-paralleling signal) transmitted from the management server 200 is not transmitted directly to the TTS 182 but is transmitted to the MG_EMS 150.

[0106] When no malfunction is detected in MG100, MG_EMS150 (control unit 153) executes control to transmit to the transfer cutoff device 181 a connection signal for connecting the specific distributed power source 170 to MG100 (power line 14) instead of the parallel-off signal transmitted from the management server 200 to the TTS 182. That is, the control unit 153 instructs the communication unit 151 to transmit the connection signal to the TTS 182, and the communication unit 151 transmits the connection signal to the TTS 182.

[0107] (Example of operation) An operation example of the second modification will be described below.

[0108] First, the operation in the case where a malfunction occurs in the power grid 12 will be described.

[0109] In stage 1-1, no malfunction occurs in the power system 12, and the section switch 191 and the transfer cutoff device 181 are in the closed state.

[0110] In stage 1-2, a malfunction occurs in the power system 12, the section switch 191 is switched to an open state, and a parallel-off signal is transmitted from the management server 200 to the MG_EMS 150. The MG_EMS 150 transmits the parallel-off signal to the TTS 182.

[0111] In phase 1-3, the transfer cutoff device 181 switches to an open state.

[0112] In steps 1-4, it is detected that no malfunction has occurred in MG 100, and MG_EMS 150 starts the independent operation of MG 100. Note that when it is detected that a malfunction has occurred in MG 100, MG_EMS 150 does not start the independent operation of MG 100 even if the malfunction of power grid 12 has been resolved or even if it is detected that no malfunction has occurred in power grid 12.

[0113] In steps 1 - 5 , the MG_EMS 150 transmits a connection signal to the TTS 182 instead of the disconnection signal received from the management server 200 .

[0114] In stage 1-6, the transfer cutoff device 181 is switched to the closed state. That is, the independent operation of the MG 100 including the specific dispersed power source 170 starts.

[0115] Secondly, the operation in the case where the malfunction in the power grid 12 is resolved will be described.

[0116] In stage 2-1, the MG_EMS 150 stops the operations of the distributed power sources 110 and the specific distributed power sources 170.

[0117] In step 2 - 2 , the MG_EMS 150 transmits a de-paralleling signal to the TTS 182 in accordance with the de-paralleling signal received from the management server 200 .

[0118] In phase 2-3, the transfer cutoff device 181 switches to an open state.

[0119] In step 2-4, the section switch 191 is switched to the closed state.

[0120] In step 2-5, a connection signal is transmitted from the management server 200 to the MG_EMS 150. The MG_EMS 150 transmits the connection signal to the TTS 182.

[0121] In step 2-6, the transfer cutoff device 181 switches to a closed state.

[0122] (Action and Effects) In the second modification, when no malfunction is detected in the MG100, the MG_EMS150 transmits to the transfer cutoff device 181 a connection signal for connecting the specific distributed power source 170 to the MG100 (power line 14) instead of the parallel-off signal transmitted from the management server 200 to the TTS 182. With this configuration, even in a case where the MG_EMS150 cannot directly control the specific distributed power source 170, it is possible to realize independent operation of the MG100 including the specific distributed power source 170, and the specific distributed power source 170 can be effectively utilized in the MG100.

[0123] [Change Example 3] The third modification of the embodiment will be described below. Differences from the embodiment will be mainly described below.

[0124] In an embodiment, when no malfunction is detected in MG100, MG_EMS150 transmits a connection signal to connect the specific distributed power source 170 to MG100 (power line 14) as a signal that takes priority over the disconnection signal transmitted from the management server 200 to TTS182.

[0125] 7, in the third modification, when no malfunction is detected in MG100, MG_EMS150 (control unit 153) transmits a request signal to management server 200 requesting that specific distributed power source 170 be connected to MG100 (power line 14). That is, the control unit 153 instructs the communication unit 151 to transmit the request signal to management server 200, and the communication unit 151 transmits the request signal to management server 200. The request signal may be considered to be a notification signal notifying that independent operation of MG100 has started.

[0126] In response to receiving the request signal, the management server 200 transmits to the transfer cutoff device 181 a connection signal for connecting the specific distributed power source 170 to the MG 100 (power line 14).

[0127] In addition, in the third modification, when a malfunction such as a power outage in the power system 12 is resolved, the MG_EMS 150 may receive a notification signal from the management server 200 notifying that the malfunction has been resolved. When a malfunction such as a power outage in the power system 12 is resolved, the MG_EMS 150 may receive a notification signal from the management server 200 notifying that the transfer cutoff device 181 should be opened.

[0128] (Example of operation) An operation example of the third modified example will be described below.

[0129] First, the operation in the case where a malfunction occurs in the power grid 12 will be described.

[0130] In stage 1-1, no malfunction occurs in the power system 12, and the section switch 191 and the transfer cutoff device 181 are in the closed state.

[0131] In stage 1 - 2 , a malfunction occurs in the power system 12 , the section switch 191 is switched to the open state, and a parallel-off signal is transmitted from the management server 200 to the TTS 182 .

[0132] In phase 1-3, the transfer cutoff device 181 switches to an open state.

[0133] In steps 1-4, it is detected that no malfunction has occurred in MG100, and MG_EMS150 starts independent operation of MG100.

[0134] In stage 1-5, the MG_EMS 150 transmits a request signal to the management server 200 requesting that the specific distributed power source 170 be connected to the MG 100 (power line 14).

[0135] In step 1 - 6 , a connection signal is sent from the management server 200 to the TTS 182 .

[0136] In stage 1-7, the transfer cutoff device 181 is switched to the closed state. That is, the independent operation of the MG 100 including the specific dispersed power source 170 starts.

[0137] Secondly, the operation in the case where the malfunction in the power grid 12 is resolved will be described.

[0138] In stage 2-1, the MG_EMS 150 receives a notification signal from the management server 200 notifying that the malfunction has been resolved.

[0139] In step 2 - 2 , the management server 200 transmits a de-parallelization signal to the TTS 182 .

[0140] In phase 2-3, the transfer cutoff device 181 switches to an open state.

[0141] In stage 2-4, the MG_EMS 150 stops the operation of the distributed power sources 110 and the specific distributed power sources 170.

[0142] In step 2-5, the section switch 191 is switched to the closed state.

[0143] In step 2 - 6 , the management server 200 transmits a connection signal to the TTS 182 .

[0144] In step 2-7, the transfer cutoff device 181 switches to a closed state.

[0145] (Action and Effects) In the third modification, when no malfunction is detected in the MG 100, the MG_EMS 150 transmits a request signal to the management server 200 requesting that the specific distributed power source 170 be connected to the MG 100 (power line 14). With this configuration, even in a case where the MG_EMS 150 cannot directly control the specific distributed power source 170, it is possible to realize independent operation of the MG 100 including the specific distributed power source 170, and the specific distributed power source 170 can be effectively utilized in the MG 100.

[0146] [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.

[0147] 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.

[0148] Although not specifically mentioned in the above disclosure, the transfer cutoff device 181 and the TTS 182 may be collectively referred to as a transfer cutoff device.

[0149] 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.

[0150] Although not specifically mentioned in the above disclosure, a program may be provided that causes a computer to execute each process performed by MG_EMS 150 or management server 200. The program may also be recorded in a computer-readable medium. Using the computer-readable medium, it is possible to install the program in a computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

[0151] 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 or the management server 200 and a processor that executes the program stored in the memory.

[0152] [Note] The above disclosure may be expressed as follows:

[0153] A first feature is a distributed power supply control system comprising: a distributed power supply connected to a regional independent system; a specific distributed power supply connected to the regional independent system; a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system; and a power supply control device that controls the distributed power supplies, wherein the specific distributed power supply is configured to be disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in a power system connected to the regional independent system, and the power supply control device comprises a control unit that connects the specific distributed power supply to the regional independent system without the disconnection signal when no malfunction is detected in the regional independent system.

[0154] A second feature is that, in the first feature, the control unit performs control to transmit, to the transfer cutoff device, a connection signal that connects the specific distributed power source to the regional independent system, as a signal that has priority over the disconnection signal, when no malfunction is detected in the regional independent system.

[0155] A third feature is a distributed power source control system according to the first feature, wherein the transfer cutoff device includes a first switch and a second switch that are installed electrically in parallel with the specific distributed power source, the first switch is configured to operate in response to the disconnection signal, and the control unit connects the specific distributed power source to the regional independent grid by the second switch when no malfunction is detected in the regional independent grid.

[0156] A fourth feature is that, in the first feature, the distributed power source control system further includes a receiving unit that receives the disconnection signal from the management server, and when no malfunction is detected in the regional independent system, the control unit executes control to transmit to the transfer cutoff device, instead of the disconnection signal, a connection signal that connects the specific distributed power source to the regional independent system.

[0157] A fifth feature is that, in the distributed power source control system, the control unit executes control to send a request signal to the management server requesting that the specific distributed power source be connected to the regional independent grid when no malfunction is detected in the regional independent grid.

[0158] A sixth feature is a power supply control device for use in a distributed power supply control system including a distributed power supply connected to a regional independent system, a specific distributed power supply connected to the regional independent system, and a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system, wherein the specific distributed power supply is configured to be disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in a power system connected to the regional independent system, and the power supply control device includes a control unit that connects the specific distributed power supply to the regional independent system without the disconnection signal when no malfunction is detected in the regional independent system.

[0159] A seventh feature is a distributed power supply control method used in a distributed power supply control system including a distributed power supply connected to a regional independent system, a specific distributed power supply connected to the regional independent system, and a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system, the distributed power supply control method including: a step A in which, when a malfunction is detected in a power system connected to the regional independent system, the specific distributed power supply is disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system; and a step B in which, when a malfunction is not detected in the regional independent system, a power supply control device that controls the distributed power supply connects the specific distributed power supply to the regional independent system without using the disconnection signal. [Explanation of symbols]

[0160] 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, 181... Transfer cutoff device, 182... TTS, 191... Section switch, 192... TTS, 200... Management server, 210... Communication unit, 220... Management unit, 230... Control unit

Claims

1. A distributed power source connected to a regional independent grid; A specific distributed power source connected to the regional independent grid; a transfer cutoff device that connects the specific distributed power source to the regional independent system or disconnects the specific distributed power source from the regional independent system; a power supply control device that controls the distributed power supply, the specific distributed power source is configured to be disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in the power system connected to the regional independent system, The power supply control device comprises a control unit that connects the specific distributed power supply to the regional independent system without using the disconnection signal when no malfunction is detected in the regional independent system.

2. 2. The distributed power supply control system according to claim 1, wherein the control unit executes control to transmit, to the transfer cutoff device, a connection signal for connecting the specific distributed power supply to the regional independent system as a signal that has priority over the disconnection signal when no malfunction is detected in the regional independent system.

3. the transfer cutoff device includes a first switch and a second switch that are electrically installed in parallel with the specific distributed power source, The first switch is configured to be operated by the disconnection signal, 2 . The distributed power supply control system according to claim 1 , wherein the control unit connects the specific distributed power supply to the regional independent grid by the second switch when no malfunction is detected in the regional independent grid.

4. a receiving unit for receiving the disconnection signal from the management server, 2. The distributed power supply control system according to claim 1, wherein the control unit executes control to transmit, to the transfer cutoff device, an interconnection signal for interconnecting the specific distributed power supply to the regional independent system, instead of the disconnection signal, when no malfunction is detected in the regional independent system.

5. 2. The distributed power supply control system according to claim 1, wherein the control unit executes control to send a request signal to the management server requesting that the specific distributed power supply be connected to the regional independent grid when no malfunction is detected in the regional independent grid.

6. A power supply control device for use in a distributed power supply control system including a distributed power supply connected to a regional independent system, a specific distributed power supply connected to the regional independent system, and a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system, the specific distributed power source is configured to be disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in the power system connected to the regional independent system, A power supply control device comprising: a control unit that connects the specific distributed power supply to the regional independent system without using the disconnection signal when no malfunction is detected in the regional independent system.

7. A distributed power supply control method for use in a distributed power supply control system including a distributed power supply connected to a regional independent system, a specific distributed power supply connected to the regional independent system, and a transfer cutoff device that connects the specific distributed power supply to the regional independent system or disconnects the specific distributed power supply from the regional independent system, comprising: A step A in which the specific distributed power source is disconnected from the regional independent system by a disconnection signal output from a management server that manages the power system when a malfunction is detected in the power system connected to the regional independent system; A distributed power source control method comprising: a step B in which a power source control device that controls the distributed power source connects the specific distributed power source to the regional independent system without using the disconnection signal when no malfunction is detected in the regional independent system.

Images