JP2018133908A - Power supply control method and dispersed power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control method and dispersed power supply, which can reduce the possibility that stabilization of power system may be degraded by renewal of firmware of a dispersed power supply.SOLUTION: The power supply control method includes: a step A of executing communications of a first command for stabilization of a power system and a second command except the first command between a dispersed power supply used for stabilization of the power system and a controller for controlling the dispersed power supply; a step B for the dispersed power supply to execute limit processing for limiting processing corresponding to at least the second command when the communication between the dispersed power supply and the controller satisfies a limit condition.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a power supply control method and a technique related to a distributed power supply.

  2. Description of the Related Art In recent years, in order to maintain the power supply / demand balance of a power system, a technique for suppressing a tidal flow from the power system to the facility or a reverse flow from the facility to the power system is known (for example, Patent Documents 1 and 2). . Specifically, the tidal flow rate or the reverse tidal flow rate is suppressed by transmitting a control message from the power management server to the control device.

JP 2013-169104 A JP 2014-128107 A

  In recent years, studies are underway to use distributed power sources for power system stabilization. For example, such a study relates to a VPP (Virtual Power Plant) using a distributed power source.

  In such a case, there is a need to update the firmware of the distributed power supply, but if such an update is allowed freely, the message sent by the distributed power supply or the message received by the distributed power supply may increase significantly. There is a possibility that the increase of these commands may adversely affect the stabilization of the power system.

  Accordingly, an object of the present invention is to provide a power supply control method and a distributed power supply that can reduce the possibility of impairing the stabilization of the power system by updating the firmware of the distributed power supply.

  A power control method according to a first feature includes a first command related to stabilization of the power system and a command other than the first command between a distributed power used for stabilizing the power system and a control device that controls the distributed power. Step A in which communication of the second command is performed, and the distributed power supply restricts at least processing corresponding to the second command when communication between the distributed power supply and the control device satisfies a restriction condition Step B for performing a restriction process.

  The distributed power source according to the second feature is a distributed power source used for stabilizing the power system. The distributed power source includes a communication unit that communicates a first command related to stabilization of the power system and a second command other than the first command between the distributed power source and a control device that controls the distributed power source, And a control unit for controlling the distributed power source. The communication unit or the control unit performs a restriction process that restricts at least a process corresponding to the second command when communication between the distributed power source and the control device satisfies a restriction condition.

  According to one aspect, it is possible to provide a power supply control method and a distributed power supply that can reduce the possibility of impairing stabilization of the power system by updating the firmware of the distributed power supply.

FIG. 1 is a diagram illustrating a power supply control system 100 according to the embodiment. FIG. 2 is a diagram illustrating a facility 300 according to the embodiment. FIG. 3 is a diagram illustrating the remote controller 320 according to the embodiment. FIG. 4 is a diagram illustrating the PCS 332 according to the embodiment. FIG. 5 is a diagram illustrating an example of the second protocol according to the embodiment. FIG. 6 is a diagram illustrating an example of the second protocol according to the embodiment. FIG. 7 is a diagram illustrating an example of the second protocol according to the embodiment. FIG. 8 is a diagram illustrating an example of the second protocol according to the embodiment. FIG. 9 is a diagram illustrating an example of a unique dedicated protocol according to the embodiment. FIG. 10 is a diagram illustrating an example of a unique dedicated protocol according to the embodiment. FIG. 11 is a diagram illustrating a power control method according to the embodiment. FIG. 12 is a diagram illustrating a power control method according to the first modification. FIG. 13 is a diagram illustrating an example of a unique dedicated protocol according to the second modification. FIG. 14 is a diagram illustrating a power control method according to the second modification. FIG. 15 is a diagram illustrating a power control method according to the third modification.

  Embodiments will be described below 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, it should be noted that the drawings are schematic and ratios of dimensions may be different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships or ratios are included between the drawings.

[Embodiment]
(Power control system)
Hereinafter, a power supply control system according to the embodiment will be described.

  As shown in FIG. 1, the power supply control system 100 includes a power management server 200 and a facility 300. In FIG. 1, facilities 300 </ b> A to 300 </ b> C are illustrated as the facility 300.

  Each facility 300 is connected to the power system 110. In the following, the flow of power from the power system 110 to the facility 300 is referred to as tidal current, and the flow of power from the facility 300 to the power system 110 is referred to as reverse power flow.

  The power management server 200 and the facility 300 are connected to the network 120. The network 120 may provide a line between the power management server 200 and the facility 300. The network 120 is, for example, the Internet. The network 120 may provide a dedicated line such as a VPN (Virtual Private Network).

  The power management server 200 is a server managed by a business operator such as a power generation business, a power transmission / distribution business, or a retail business.

  The power management server 200 transmits, to the local control device 360 provided in the facility 300, a control message instructing control of a distributed power source (for example, a solar cell device, a storage battery device, and a fuel cell device) provided in the facility 300. . For example, the power management server 200 may transmit a power flow control message (for example, DR; Demand Response) that requests control of power flow, or may transmit a reverse power flow control message that requests control of reverse power flow. Furthermore, the power management server 200 may transmit a power control message for controlling the operating state of the distributed power. The degree of control of the tidal current or the reverse tidal current may be represented by an absolute value (for example, OO kW) or a relative value (for example, OO%). Or the control degree of a tidal current or a reverse tidal current may be represented by two or more levels. The degree of control of power flow or reverse power flow may be represented by a power rate (RTP; Real Time Pricing) determined by the current power supply / demand balance, or a power rate (TOU; Time Of Use) determined by a past power supply / demand balance. May be represented by

  The facility 300 includes a router 500 as shown in FIG. The router 500 is connected to the power management server 200 via the network 120. The router 500 forms a local area network and is connected to each device (for example, the PCS 331, the PCS 332, the PCS 333 load 350, the local control device 360, etc.). In FIG. 2, a solid line indicates a power line, and a dotted line indicates a signal line. The embodiment is not limited to this, and a signal may be transmitted through a power line.

  The facility 300 includes a solar cell 311, a storage battery 312, a fuel cell 313, a hot water supply device 314, a remote controller 320, a PCS 331, a PCS 332, a PCS 333, a distribution board 340, a load 350, and a local control device. 360.

  The solar cell 311 is a device that generates power in response to light reception. The solar cell 311 outputs the generated DC power. The amount of power generated by the solar cell 311 changes according to the amount of solar radiation applied to the solar cell 311.

  The storage battery 312 is a device that stores electric power. The storage battery 312 outputs the accumulated DC power. The storage battery 312 may be a power source used for VPP (Virtual Power Plant).

  The fuel cell 313 is a battery that generates electric power using fuel. The fuel may be, for example, a material containing hydrogen or a material containing alcohol. The fuel cell 313 includes, for example, a solid oxide fuel cell (hereinafter referred to as SOFC), a solid polymer fuel cell (hereinafter referred to as PEFC), a phosphoric acid fuel cell (hereinafter referred to as PAFC). : Phosphoric Acid Fuel Cell) or molten carbonate fuel cell (hereinafter referred to as MCFC: Molten Carbonate Fuel Cell).

  The hot water supply device 314 has a hot water storage tank, and uses the exhaust heat of the fuel cell 313 to maintain or increase the amount of water (hot water) stored in the hot water storage tank, or to store water in the hot water storage tank. Maintain or increase the temperature of (hot water). Such control may be referred to as boiling water stored in the hot water tank.

  The remote controller 320 is an example of a control device that controls a distributed power source used for stabilizing the power system 110. Specifically, the remote controller 320 transmits a command for controlling the distributed power source to the distributed power source in response to a command received from the local control device 360. The remote controller 320 may transmit a command to the distributed power source in response to a user operation. The remote controller 320 may transmit the command to the distributed power source regardless of the command received from the local control device 360 and the user operation. The command may be, for example, a command (Ping command) for confirming whether communication between the remote controller and the distributed power source is maintained. The Ping command is a command that is transmitted periodically. The command may be, for example, an emergency stop command that requests an emergency stop of the distributed power source.

  The PCS 331 is a power conversion system (PCS; Power Conditioning System) connected to the solar cell 311. The PCS 331 converts DC power from the solar cell 311 into AC power.

  The PCS 332 is a power conversion device connected to the storage battery 312. The PCS 332 converts DC power from the storage battery 312 to AC power, and converts AC power to the storage battery 312 into DC power. The storage battery 312 and the PCS 332 are examples of a distributed power source (storage battery device) used for stabilizing the power system 110.

  The PCS 333 is a power conversion device connected to the fuel cell 313. The PCS 333 converts DC power from the fuel cell 313 into AC power.

  Distribution board 340 is connected to main power line 10L. The distribution board 340 includes a first distribution board 340A and a second distribution board 340B. The first distribution board 340A is connected to the power system 10 via the main power line 10LA. The first distribution board 340A is connected to the solar cell 311 via the PCS 331, is connected to the storage battery 312 via the PCS 332, and is connected to the fuel cell 313 via the PCS 333. The first distribution board 340A supplies the power output from the PCS 331 to PCS 333 and the power supplied from the power system 10 to the second distribution board 340B via the main power line 10LB. The second distribution board 340B distributes the power supplied via the main power line 10LB to each device (here, the load 350 and the local control device 360).

  The load 350 is a device that consumes power supplied through the power line. For example, the load 350 includes devices such as an air conditioner, a lighting device, a refrigerator, and a television. The load 350 may be a single device or may include a plurality of devices.

  The local control device 360 is a device (EMS; Energy Management System) that manages power information indicating power in the facility 300. The power in the facility 300 is the power flowing through the facility 300, the power purchased by the facility 300, or the power sold from the facility 300. Therefore, the local control device 360 manages at least the PCS 331 to PCS 333.

  In the embodiment, communication between the power management server 200 and the local control device 360 is performed according to the first protocol. On the other hand, communication between the local control device 360 and the distributed power supply or the remote controller 320 is performed according to a second protocol different from the first protocol. As the first protocol, for example, a protocol compliant with Open ADR (Automated Demand Response) or a unique dedicated protocol can be used. As the second protocol, for example, a protocol conforming to ECHONET Lite, SEP (Smart Energy Profile) 2.0, KNX, or an original dedicated protocol can be used. Note that the first protocol and the second protocol only need to be different. For example, even if both are unique dedicated protocols, they may be protocols created according to different rules.

  In the embodiment, communication between the remote controller 320 and the storage battery device may be performed according to a protocol different from the first protocol and the second protocol described above. Such a protocol may be, for example, a unique dedicated protocol. Communication between the remote controller 320 and the storage battery device may be performed according to the second protocol.

(Remote controller)
Hereinafter, the remote controller according to the embodiment will be described. As illustrated in FIG. 3, the remote controller 320 includes a communication unit 321 and a control unit 322. The remote controller 320 is an example of a control device that controls a storage battery device used for stabilizing the power system 110.

  The communication unit 321 includes a communication module, and may communicate with the power management server 200 via the network 120. The communication unit 321 performs communication according to the first protocol. For example, the communication unit 321 may receive a message from the power management server 200 according to the first protocol. The communication unit 321 may transmit a message response to the power management server 200 according to the first protocol.

  In the embodiment, the communication unit 321 communicates with the PCS 332. The communication unit 321 performs communication according to a unique dedicated protocol, for example. Here, the communication unit 321 performs communication of the first command related to the stabilization of the power system 110 and the second command other than the first command.

  Here, the first command may be the emergency stop command described above. The first command may be a command related to control messages (a power flow control message, a reverse power flow control message, and a power control message) transmitted from the power management server 200. The second command may be a command that does not affect the stabilization of the power system 110, and may be a command received from the local control device 360 or a command related to a user operation, for example. The second command may be the Ping command described above. The emergency stop command may be considered as an example of the second command (for example, see Modification 4).

  The control unit 322 includes a memory, a CPU, and the like, and controls each component provided in the remote controller 320. Specifically, the control unit 322 instructs the communication unit 321 to transmit a command to the PCS 332 based on a command received from the local control device 360 or a user operation. The control unit 322 may instruct the communication unit 321 to transmit a command to the PCS 332 based on a message received from the power management server 200.

(PCS)
Hereinafter, the PCS according to the embodiment will be described. As illustrated in FIG. 4, the PCS 332 includes a communication unit 332-1 and a control unit 332-2. The PCS 332 constitutes a storage battery device used for stabilizing the power system 110.

  The communication unit 332-1 includes a communication module, and communicates with the remote controller 320. The communication unit 332-1 performs communication according to a unique dedicated protocol, for example. Here, the communication unit 332-1 performs communication of the first command related to the stabilization of the power system 110 and the second command other than the first command (step A).

  The control unit 332-2 includes a memory and a CPU, and controls each component provided in the PCS 332. Specifically, the control unit 332-2 controls conversion from DC power to AC power, conversion from AC power to DC power, and the like based on a command received from the remote controller 320. In other words, the control unit 332-2 controls the operation (charging operation, discharging operation, or standby operation) of the storage battery 312 based on the command received from the remote controller 320.

(Example of second protocol)
Hereinafter, an example of the second protocol according to the embodiment will be described. Here, a case where the second protocol is a protocol conforming to ECHONET Lite is illustrated.

  As shown in FIG. 5, a command for requesting setting of the operation state of the device (hereinafter, SET command M510) includes a header M511, a code M512, and a target property M513. In the embodiment, the SET command M510 is an example of a setting command for instructing each device to set or operate the device, and is a command transmitted from the EMS 160 to the device. The header M511 is information indicating the destination of the SET command M510. The code M512 is information indicating the type of command including the code M512. Here, the code M512 is information indicating that the command including the code M512 is a SET command. The target property M513 includes an information element (property) indicating a setting or operation that the EMS 160 instructs the device.

  As shown in FIG. 6, the command response to the command (hereinafter, SET response command M520) includes a header M521, a code M522, and a response content M523. In the embodiment, the SET response command M520 is an example of a command transmitted from the device to the EMS 160 in response to a command received from the EMS 160.

  The header M521 is information indicating the destination of the SET response command M520. The code M522 is information indicating the type of command including the code M522. Here, the code M522 is information indicating that the command including the code M522 is a SET response command. The response content M523 includes information indicating that the SET command has been received. Such information may be a copy of the property included in the SET command, or may be an acknowledgment (ACK). Such information is not limited to this, and may be a response (Selective ACK) intended to correctly receive only a part of the data.

  As shown in FIG. 7, a command for requesting reporting of device information (hereinafter, GET command M610) includes a header M611, a code M612, and a target property M613. In the embodiment, the GET command M610 is an example of a request command for requesting each device to report device information, and is an example of a command transmitted from the EMS 160 to the device. The header M611 is information indicating the destination of the GET command M610. The code M612 is information indicating the type of command including the code M612. Here, the code M612 is information indicating that the command including the code M612 is a GET command. The target property M613 includes an information element (property) that the EMS 160 requests to report.

  As shown in FIG. 8, the command response to the command (hereinafter, GET response command M620) includes a header M621, a code M622, and a response content M623. In the embodiment, the GET response command M620 is an example of a command transmitted from the device to the EMS 160 in response to a command received from the EMS 160.

  The header M621 is information indicating the destination of the GET response command M620. The code M622 is information indicating the type of command including the code M622. Here, the code M622 is information indicating that the command including the code M622 is a GET response command. The response content M623 includes an information element (property) requested by the GET command.

  Here, the information element (property) may be shared between commands. For example, in the case where the information element is the operation state of the device, the SET command including the operation state as the information element functions as a command for instructing the device to set the operation state. On the other hand, the GET command including the operation state as an information element functions as a command for requesting a report of the operation state of the device.

  Information elements (properties) include information elements used only for SET commands (SET response commands), information elements used only for GET commands (GET response commands), SET commands (SET response commands), and GET commands (GET response commands). Information elements used for both are listed. In addition to the SET command and the GET command, there may be an information notification command (INF command) for autonomously reporting device information from each device.

(Example of original dedicated protocol)
Hereinafter, an example of a unique dedicated protocol according to the embodiment will be described. The unique dedicated protocol is an example of a protocol used for communication between the remote controller 320 and the PCS 332. Here, a command transmitted from the remote controller 320 to the PCS 332 is illustrated.

  As shown in FIG. 9, the first command M110 includes a header M111, a flag M112, and a control content M113. The header M111 is information indicating the destination of the first command M110. The flag M112 is an information element indicating that the command is the first command M110. The flag M112 may be included in the header M111. The control content M113 is an information element indicating the control content of the first command M110.

  As shown in FIG. 10, the second command M120 includes a header M121, a flag M122, and a control content M123. The header M121 is information indicating the destination of the second command M120. The flag M122 is an information element indicating that the command is the second command M120. The flag M122 may be included in the header M121. The control content M123 is an information element indicating the control content of the second command M120.

  Here, when the remote controller 320 receives a control message (a power flow control message, a reverse power flow control message, and a power control message) from the power management server 200, the first command and the second command can be used properly. On the other hand, when the remote controller 320 does not receive the control message from the power management server 200, the first command and the second command are based on the information element (remote operation setting property) included in the command received from the local control device 360. May be used properly. Such an information element is, for example, an information element for the remote controller 320 to identify that control is performed via a public line (for example, the network 120). Alternatively, as an information element included in a command received from the local control device 360, an information element indicating whether or not the command is related to stabilization of the power system 110 may be introduced.

(Restriction processing)
Hereinafter, the limiting process according to the embodiment will be described. The restriction process is a process of restricting at least a process corresponding to the second command when communication between the storage battery device (PCS 332) and the remote controller 320 satisfies a restriction condition. The restriction process may be a process that targets the second command without targeting the first command.

  Specifically, the PCS 332 determines whether or not the restriction condition is satisfied. If the restriction condition is satisfied, the PCS 332 performs a restriction process that restricts at least the process corresponding to the second command (step B). When the flag M112 and the flag M122 described above are not included in the command, the PCS 332 may limit processing corresponding to both the first command and the second command.

  In the embodiment, the communication unit 332-1 of the PCS 332 performs a first restriction process that stops at least reception of the second command. When the first command and the second command can be identified, the communication unit 332-1 of the PCS 332 may stop the reception of the second command without stopping the reception of the first command. The communication unit 332-1 of the PCS 332 may stop receiving both the first command and the second command when the first command and the second command cannot be identified.

  In such a case, the limiting condition may be that the transmission rates of the first command and the second command received by the PCS 332 exceed a predetermined value. Such a transmission rate can be monitored by the communication unit 332-1. Alternatively, the limiting condition may be that the total number of unprocessed first commands and second commands received by the PCS 332 exceeds a predetermined number. The total number of unprocessed items can be monitored by the control unit 332-2. The total number of unprocessed items is the total number of commands accumulated in the processing queue of the control unit 332-2. In such a case, the control unit 332-2 may notify the communication unit 332-1 that the total number of unprocessed items has exceeded a predetermined number.

(Power control method)
Hereinafter, a power control method according to the embodiment will be described. Here, the operation of the communication unit 332-1 of the PCS 332 will be mainly described.

  As shown in FIG. 11, in step S10, the PCS 332 confirms whether the restriction condition is satisfied. The limiting condition may be that the transmission rates of the first command and the second command received by the PCS 332 exceed a predetermined value, and the unprocessed total number of the first command and the second command received by the PCS 332 is a predetermined number. It may be exceeded. The PCS 332 performs the process of step S11 when the restriction condition is satisfied. The PCS 332 performs the process of step S12 when the restriction condition is not satisfied.

  In step S11, the PCS 332 determines whether the command is a second command. The PCS 332 performs the process of step S13 when the command is the second command. The PCS 332 performs the process of step S12 when the command is the first command.

  In step S12, the PCS 332 receives the command and performs processing corresponding to the command (normal processing). That is, when the determination result of step S10 is NO, the process corresponding to the first command or the second command is performed, and when the determination result of step S11 is NO, the process corresponding to the first command is performed. Do.

  In step S13, the PCS 332 stops receiving the second command (first restriction process).

  In the flow shown in FIG. 11, the first command and the second command can be identified, but when the first command and the second command are not identifiable, the process of step S <b> 11 may be omitted. In such a case, the PCS 332 stops receiving both the first command and the second command.

(Function and effect)
In the embodiment, the PCS 332 restricts at least processing corresponding to the second command when the restriction condition is satisfied. Therefore, even if there is a possibility that the command transmitted / received by the PCS may increase due to the firmware update of the PCS 332, the possibility of impairing the stabilization of the power system 110 can be reduced.

  Here, when the restriction process is a process that targets the second command without targeting the first command, the possibility of impairing the stabilization of the power system 110 is further reduced. On the other hand, even when the limiting process is a process that targets both the first command and the second command, it is possible to suppress at least an operation delay associated with an overload of the PCS 332.

[Modification 1]
Hereinafter, Modification Example 1 of the embodiment will be described. In the following, differences from the embodiment will be mainly described.

  Specifically, in the embodiment, the case where the communication unit 332-1 of the PCS 332 performs the restriction process is illustrated. On the other hand, in the first modification, a case where the control unit 332-2 of the PCS 332 performs the restriction process is illustrated.

  In the first modification, the control unit 332-2 of the PCS 332 performs a second restriction process that discards at least the second command. In such a case, the communication unit 332-1 of the PCS 332 does not stop receiving the first command and the second command. The control unit 332-2 of the PCS 332 may discard the second command without discarding the first command. The control unit 332-2 of the PCS 332 may identify the first command and the second command based on the control content of the command even if the flag M112 and the flag M122 are not included in the command. The control unit 332-2 of the PCS 332 may discard both the first command and the second command when the first command and the second command cannot be identified.

  In such a case, the limiting condition may be that the total number of unprocessed first commands and second commands received by the PCS 332 exceeds a predetermined number. The total number of unprocessed items can be monitored by the control unit 332-2. Alternatively, the limiting condition may be that the transmission rates of the first command and the second command received by the PCS 332 exceed a predetermined value. Such a transmission rate can be monitored by the communication unit 332-1. In such a case, the communication unit 332-1 may notify the control unit 332-2 that the transmission rate has exceeded a predetermined value.

(Power control method)
Hereinafter, a power control method according to the first modification will be described. Here, the operation of the control unit 332-2 of the PCS 332 will be mainly described.

  As shown in FIG. 12, in step S20, the PCS 332 confirms whether the restriction condition is satisfied. The limiting condition may be that the transmission rates of the first command and the second command received by the PCS 332 exceed a predetermined value, and the unprocessed total number of the first command and the second command received by the PCS 332 is a predetermined number. It may be exceeded. The PCS 332 performs the process of step S21 when the restriction condition is satisfied. The PCS 332 performs the process of step S22 when the restriction condition is not satisfied.

  In step S21, the PCS 332 determines whether or not the command is a second command. The PCS 332 performs the process of step S23 when the command is the second command. The PCS 332 performs the process of step S22 when the command is the first command.

  In step S22, the PCS 332 receives the command and performs processing corresponding to the command (normal processing). That is, when the determination result of step S20 is NO, processing corresponding to the first command or the second command is performed, and when the determination result of step S21 is NO, processing corresponding to the first command is performed. Do.

  In step S23, the PCS 332 discards the second command (second restriction process).

  In the flow shown in FIG. 12, the first command and the second command can be identified, but when the first command and the second command are not identifiable, the process of step S21 may be omitted. In such a case, the PCS 332 discards both the first command and the second command.

[Modification 2]
Hereinafter, a second modification of the embodiment will be described. In the following, differences from the embodiment will be mainly described.

  Specifically, in the embodiment, the case where the communication unit 332-1 of the PCS 332 performs the restriction process is illustrated. On the other hand, in the second modification, a case where the control unit 332-2 of the PCS 332 performs the restriction process is illustrated.

  In the second modification, the control unit 332-2 of the PCS 332 performs the third restriction process that responds that the control corresponding to the second command is not performed and the control corresponding to the second command is not performed. In such a case, the communication unit 332-1 of the PCS 332 does not stop receiving the first command and the second command. The control unit 332-2 of the PCS 332 responds that the control corresponding to the first command is performed, the control corresponding to the first command corresponding to the first command is performed, and the control corresponding to the second command is performed. A response may be made not to perform the control corresponding to the second command. The control unit 332-2 of the PCS 332 may identify the first command and the second command based on the control content of the command even if the flag M112 and the flag M122 are not included in the command. When the first command and the second command are not identifiable, the control unit 332-2 of the PCS 332 does not perform control corresponding to both the first command and the second command, and the first command and the second command. You may respond that both are not performed.

  For example, a command that responds that control corresponding to the command is not performed (hereinafter referred to as a response command) is as shown in FIG. As shown in FIG. 13, the response command M130 includes a header M131 and a response content M133. The header M131 is information indicating the destination of the response command M130. The response content M133 is an information element (for example, Null) indicating that control corresponding to the command is not performed.

(Power control method)
Hereinafter, a power control method according to the second modification will be described. Here, the operation of the control unit 332-2 of the PCS 332 will be mainly described.

  As shown in FIG. 14, in step S30, the PCS 332 checks whether or not the restriction condition is satisfied. The limiting condition may be that the transmission rates of the first command and the second command received by the PCS 332 exceed a predetermined value, and the unprocessed total number of the first command and the second command received by the PCS 332 is a predetermined number. It may be exceeded. The PCS 332 performs the process of step S31 when the restriction condition is satisfied. The PCS 332 performs the process of step S32 when the restriction condition is not satisfied.

  In step S31, the PCS 332 determines whether the command is the second command. The PCS 332 performs the process of step S33 when the command is the second command. The PCS 332 performs the process of step S32 when the command is the first command.

  In step S32, the PCS 332 receives the command and performs processing corresponding to the command (normal processing). That is, when the determination result of step S30 is NO, the process corresponding to the first command or the second command is performed, and when the determination result of step S31 is NO, the process corresponding to the first command is performed. Do.

  In step S33, the PCS 332 responds that the control corresponding to the second command is not performed and the control corresponding to the second command is not performed (third restriction process).

  In the flow shown in FIG. 14, the first command and the second command can be identified. However, when the first command and the second command are not identifiable, the process of step S31 may be omitted. In such a case, the PCS 332 does not perform both the first command and the second command, and responds that control corresponding to both the first command and the second command is not performed.

[Modification 3]
Hereinafter, Modification Example 3 of the embodiment will be described. In the following, differences from the embodiment will be mainly described.

  In the modification example 3, a combination example of the first restriction process, the second restriction process, and the third restriction process described above will be described. Specifically, the first restriction process or the second restriction process may be applied to a command that does not require reception confirmation among the second commands. The third restriction process may be applied to a command for which reception confirmation is requested among the second commands.

  Here, the command for which reception confirmation is not requested is, for example, a command for requesting reporting of device information (for example, a GET command shown in FIG. 7). On the other hand, the command for which reception confirmation is requested may be a command for requesting setting of the operation state of the device (for example, the SET command shown in FIG. 5) or the above-described Ping command.

  Note that the first command may be a command for which reception confirmation is requested regardless of whether or not the restriction processing is performed.

(Power control method)
Hereinafter, a power supply control method according to the modification example 3 will be described. Here, the operation of the control unit 332-2 of the PCS 332 will be mainly described. However, the flow shown below may be the operation of the communication unit 332-1 of the PCS 332 as long as the communication unit 332-1 of the PCS 332 can grasp the content of the command.

  As shown in FIG. 15, in step S40, the PCS 332 confirms whether the restriction condition is satisfied. The limiting condition may be that the transmission rates of the first command and the second command received by the PCS 332 exceed a predetermined value, and the unprocessed total number of the first command and the second command received by the PCS 332 is a predetermined number. It may be exceeded. The PCS 332 performs the process of step S41 when the restriction condition is satisfied. The PCS 332 performs the process of step S43 when the restriction condition is not satisfied.

  In step S41, the PCS 332 determines whether the command is a second command. The PCS 332 performs the process of step S43 when the command is the second command. The PCS 332 performs the process of step S43 when the command is the first command.

  In step S42, the PCS 332 determines whether the command is a command requesting reception confirmation. The PCS 332 performs the process of step S45 when reception confirmation is requested. The PCS 332 performs the process of step S44 when reception confirmation is not requested.

  In step S43, the PCS 332 receives the command and performs processing corresponding to the command (normal processing). That is, when the determination result of step S40 is NO, the process corresponding to the first command or the second command is performed. When the determination result of step S41 is NO, the process corresponding to the first command is performed. Do.

  In step S44, the PCS 332 performs the first restriction process or the second restriction process described above. That is, the PCS 332 stops receiving the second command. Alternatively, the PCS 332 discards the second command.

  In step S45, the PCS 332 performs the third restriction process described above. That is, the PCS 332 responds that the control corresponding to the second command is not performed and the control corresponding to the second command is not performed.

  In the flow shown in FIG. 15, the first command and the second command can be identified, but when the first command and the second command are not identifiable, the process of step S41 may be omitted. In such a case, the PCS 332 may perform the process of step S44 or step S45 without distinguishing between the first command and the second command, depending on whether or not reception confirmation is requested.

[Modification 4]
Hereinafter, Modification Example 4 of the embodiment will be described. In the following, differences from the embodiment will be mainly described.

  In the modification example 4, an exception process of the first restriction process, the second restriction process, or the third restriction process described above will be described. Specifically, the PCS 332 restricts commands other than the specific command without performing the restriction corresponding to the specific command even if the restriction condition is satisfied. Here, in the modification example 4, regardless of whether the first command and the second command can be identified, even if the restriction condition is satisfied, the restriction corresponding to the specific command is not performed. That is, the specific command may be considered as an example of the second command when the first command and the second command can be identified. If the first command and the second command are not identifiable, the specific command may be considered as an example of either the first command or the second command, and may be a command other than the first command and the second command. You may think that there is.

  For example, the specific command may be the emergency stop command described above. The specific command may be different depending on the type of the distributed power source. For example, if the distributed power source is a storage battery device, the command related to the reverse power flow suppression message may not be treated as a specific command. However, if the distributed power source is a solar cell device, the command related to the reverse power flow suppression message is It may be treated as a specific command.

[Modification 5]
Hereinafter, Modification Example 5 of the embodiment will be described. In the following, differences from the embodiment will be mainly described.

  In the modified example 5, the PCS 332 performs processing for turning off the power of the storage battery device, processing for disconnecting the storage battery device from the power system 110, and processing for setting the operation of the storage battery device as a standby operation when the restriction condition is satisfied. At least one of the processes is performed (step C). The PCS 332 may perform at least one of the processes described above when the restriction condition is satisfied for a certain period of time or longer.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the embodiment, the storage battery device (storage battery 312 and PCS 332) is illustrated as a distributed power source used for stabilizing the power system 110. However, the embodiment is not limited to this. The distributed power source used for stabilizing the power system 110 may be a solar cell device (solar cell 311 and PCS 331) or a fuel cell device (fuel cell 313 and PCS 333). Alternatively, the distributed power source used for stabilizing the power system 110 may be a distributed power source that uses natural energy such as wind power or geothermal heat.

  In the embodiment, the remote controller 320 is provided as a control device that controls the storage battery device. However, the embodiment is not limited to this. A remote controller may be provided as a control device that controls the solar cell device or the fuel cell device.

  In the embodiment, the remote controller 320 is exemplified as a control device that controls the distributed power supply. However, the embodiment is not limited to this. The control device that controls the distributed power supply may be a local control device 360 (EMS).

  In the embodiment, the case where the protocol used in the communication between the remote controller 320 and the PCS 332 is a unique dedicated protocol is illustrated. However, the embodiment is not limited to this. The protocol used for communication between the remote controller 320 and the PCS 332 may be the second protocol.

  In the embodiment, the case where the PCS 332 performs the restriction process on the command received from the remote controller 320 is exemplified. However, the embodiment is not limited to this. For example, the PCS 332 may perform a restriction process for commands transmitted to the remote controller 320.

  Although not particularly mentioned in the embodiment, the remote controller 320 may detect a communication abnormality when a response command corresponding to the Ping command is not received over a certain period. On the other hand, the PCS 332 may stop the operation of the PCS 332 due to a communication abnormality when the Ping command is not received for a certain period or longer.

  In the embodiment, each distributed power supply is provided with a PCS individually. However, the embodiment is not limited to this. One PCS may be provided for two or more distributed power sources.

  In the embodiment, the case where the PCS 332 (distributed power supply) and the remote controller 320 (control device) are separate devices is illustrated. However, the embodiment is not limited to this. The first functional block included in the PCS 332 and the second functional block included in the remote controller 320 may be provided in one apparatus. The first functional block and the second functional block may be realized in hardware by different CPUs provided on different boards, or may be realized in hardware by different CPUs provided on the same board, and the same The software may be realized by a CPU. In these cases, “communication”, “transmission”, and “reception” may be appropriately read as “interface”, “output”, “input”, and the like.

  Although not specifically mentioned in the embodiment, the local control device 360 provided in the facility 300 may not necessarily be provided in the facility 300. For example, some of the functions of the local control device 360 may be provided by a cloud server provided on the Internet. That is, it may be considered that the local control device 360 includes a cloud server.

  DESCRIPTION OF SYMBOLS 10L ... Main power line, 100 ... Power supply control system, 110 ... Power system, 120 ... Network, 200 ... Power management server, 300 ... Facility, 311 ... Solar cell, 312 ... Storage battery, 313 ... Fuel cell, 314 ... Hot water supply device, 320 ... Remote controller, 321 ... Communication part, 322 ... Control part, 331 ... PCS, 332 ... PCS, 332-1 ... Communication part, 332-2 ... Control part, 333 ... PCS, 340 ... Distribution board, 350 ... Load, 360 ... local control device, 500 ... router

Claims (17)

Step A for communicating a first command related to stabilization of the power system and a second command other than the first command between a distributed power source used for stabilization of the power system and a control device that controls the distributed power source; ,
The distributed power source includes a step B for performing a restriction process for restricting at least a process corresponding to the second command when communication between the distributed power supply and the control device satisfies a restriction condition. A power control method.   The power control method according to claim 1, wherein the restriction process is a first restriction process that stops at least reception of the second command.   The power control method according to claim 2, wherein the first restriction process is a process that targets the second command without targeting the first command.   The power control method according to claim 1, wherein the restriction process is a second restriction process in which at least the second command is discarded without stopping reception of the first command and the second command.   The power control method according to claim 4, wherein the second restriction process is a process that targets the second command without targeting the first command.   The restriction process does not stop the reception of the first command and the second command, does not perform the control corresponding to the second command, and does not perform the control corresponding to the second command. The power supply control method according to any one of claims 1 to 5, which is a third restriction process that responds.   The power control method according to claim 6, wherein the third restriction process is a process that targets the second command without targeting the first command.   The power control method according to claim 1, wherein the limiting condition is that a total number of unprocessed first commands and second commands received by the distributed power source exceeds a predetermined number. .   The power supply control method according to claim 1, wherein the restriction condition is that a transmission rate of the first command and the second command received by the distributed power supply exceeds a predetermined value.   The power control method according to claim 2, wherein the first restriction process is applied to a command that does not require reception confirmation among the second commands.   The power control method according to claim 4, wherein the second restriction process is applied to a command that does not require reception confirmation among the second commands.   The power control method according to claim 6, wherein the third restriction process is applied to a command for which reception confirmation is requested among the second commands.   12. The power supply control method according to claim 1, wherein the first command is a command for which reception confirmation is requested.   The step B includes a step of restricting commands other than the specific command without performing a restriction corresponding to the specific command even if the restriction condition is satisfied. Power control method.   When the restriction condition is satisfied, at least one of a process of turning off the power of the distributed power supply, a process of disconnecting the distributed power supply from the power system, and a process of setting the operation of the distributed power supply as a standby operation The power supply control method according to claim 1, further comprising step C for performing one process.   The power supply control method according to any one of claims 1 to 15, wherein the distributed power supply is a storage battery device. A distributed power source used for power system stabilization,
A communication unit that communicates a first command related to stabilization of the power system and a second command other than the first command between the distributed power source and a control device that controls the distributed power source;
A control unit for controlling the distributed power supply,
The communication unit or the control unit performs restriction processing for restricting at least processing corresponding to the second command when communication between the distributed power source and the control device satisfies a restriction condition. Distributed power supply.

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