JP4041825B2 - Distribution line cutoff control device - Google Patents

Description

  The present invention relates to a distribution line interruption control device that controls connection and interruption between a distributed power source and a distribution line.

  A distributed power source is a device that is installed in a customer's house such as a factory, a building, or a general house, and can generate power by receiving, for example, the supply of sunlight or wind power. Since these distributed power sources have a relatively small power generation capacity, they may not be able to cover the power required at customer homes. Therefore, when the distribution system that supplies power from the substation and the distributed power source are electrically connected via the distribution line, and the power of the distributed power source can cover the power required at the customer's home, Electric power is used, and when the power supplied from the distributed power supply is insufficient with respect to the power required at the customer's house, the power of the distribution system is supplied. As a result, power can be stably used at the customer's home. In addition, when the power of the distributed power source is sufficient to cover the power required at the customer's home, the distributed power source may supply power to the distribution system. In this way, the operation in which the distributed power source and the power distribution system are electrically connected is called interconnection.

  For example, when an accident occurs in the distribution system connected to the distributed power source, the power supply of the distribution system is stopped for the purpose of removing the accident point and performing the recovery work. However, even if the supply of power to the distribution system is stopped, if the distributed power source is operating, a reverse power flow may occur from the distributed power source to the power distribution system, which may cause an electric shock to an operator who performs the restoration work. Here, the distributed power source generates power despite the power supply of the distribution system being stopped, and the distribution line connecting the distribution system and the distributed power source and the load connected to the distribution line The state where electric power is being supplied to is referred to as isolated operation. Therefore, when stopping the power supply of the distribution system connected to the distributed power supply, it is necessary to cut off the distributed power supply from the distribution system in order to prevent reverse power flow to the distribution system due to the independent operation of the distributed power supply There is. As a device that shuts off the distributed power source from the distribution system during the independent operation of the distributed power source, it detects the presence or absence of the independent operation by the distributed power source, and shuts off the distribution line when the distributed power source becomes the independent operation Is known (see, for example, Patent Document 1). In addition, as a device that shuts off the distributed power source from the distribution system during the independent operation of the distributed power source, for example, a transfer cutoff device that forcibly shuts off the distribution line based on a cutoff instruction signal transmitted from a sales office of an electric power company. Has also been proposed.

  Hereinafter, a configuration example of a power distribution system to which a conventional distribution line cutoff control device is applied will be described with reference to FIG. 3. FIG. 3 is a block diagram showing a configuration example of a power distribution system to which a conventional distribution line cutoff control device is applied.

  The power distribution system shown in FIG. 3 includes, for example, an information processing apparatus 10 provided at a business office of a power company, a power distribution system 1 that supplies power from a substation 20, and a customer's house.

  The information processing apparatus 10 and the power distribution system 1 are communicably connected via an optical communication line 310, a communication network 300, and a slave station (hereinafter referred to as “far control station”) 42 of the power distribution remote monitoring and control apparatus. . The information processing apparatus 10 and the customer's house are communicably connected via an optical communication line 320, a communication network 300, a media converter (hereinafter referred to as M / C) 34, and a PLC modem 331. Here, “PLC” is an abbreviation for Power Line Communication.

  The optical communication lines 310 and 320 may be metal communication lines.

≪Distribution system 1≫
In FIG. 3, the power distribution system 1 includes a substation 20, a high voltage distribution line 210, a low voltage distribution line 220, a pole transformer 40, and a pole switch 41.

  The pole transformer 40 is for stepping down the voltage of the high voltage (for example, 6.6 kV) distribution line 210 from the substation 20 and distributing the voltage to the customer's home through the low voltage (for example, 210 V) distribution line 220.

  The pole switch 41 is installed on the upstream side of the pole transformer 40 near the substation 20, and the upstream and downstream sides of the pole switch 41 in the high-voltage distribution line 210 are blocked (hereinafter referred to as open state). Or it is set as the state (henceforth closed state) which connected the upstream and downstream of the said pole switch 41 concerned. That is, when the pole switch 41 is in a closed state, power is supplied from the substation 20 to the low voltage distribution line 220, and when the pole switch 41 is in an open state, the substation is connected to the low voltage distribution line 220. The power from 20 is not supplied. The open / close state of the pole switch 41 is switched by a remote control station 42 provided in the vicinity of the pole switch 41.

<< Information processing apparatus 10 >>
The information processing apparatus 10 mainly includes a power distribution server 110, a monitoring control terminal 120, a cutoff instruction signal transmission device 130, and a master station of a power distribution remote monitoring control device (hereinafter abbreviated as a power distribution remote control master station) 150. Are connected to each other via a communication line 160 such as a LAN so that they can communicate with each other.

  The power distribution server 110 mainly has a function of managing and controlling the cutoff instruction signal transmission device 130, the power distribution distance control master station 150, and the like. The monitoring control terminal 120 is, for example, a terminal for an operator of a power company sales office to input data to the power distribution server 110 or display data output from the power distribution server 110.

  The distribution remote control master station 150 transmits a control signal designating the open / close state of the pole switch 41 to the remote control station 42 in accordance with an instruction from the power distribution server 110, and thereby via the remote control station 42. It is a device for switching the open / close state of the pole switch 41.

  The shut-off instruction signal transmission device 130 shuts off a distributed power source 346 and a distributed power source 356, which will be described later, from the power distribution system 1 through a media converter (hereinafter referred to as M / C) 140 further connected thereto. It is a device having a function of transmitting an instruction signal. The shut-off instruction signal is used when the distribution distance control master station 150 designates the pole switch 41 to be open based on data input from the monitoring terminal 120 to the distribution server 110, for example. It is a signal generated by an instruction from the master station 150.

≪Customer's house≫
The low voltage distribution line 220 is drawn into the customer's house as the low voltage distribution line 230 via the PLC modem 331. The PLC modem 331 is a transmission modem having a function of transmitting both an information signal (for example, a cutoff instruction signal) transmitted from the information processing apparatus 10 and the power of the low-voltage distribution line 220 to the low-voltage distribution line 230. The PLC modem 331 is a master station modem that supervises PLC modems (for example, the PLC modem 340 and the PLC modem 350) in the customer's house. Further, the PLC modem 331 may be provided in a customer's house.

  FIG. 3 illustrates an example of a configuration in the case where a plurality of power generation devices (for example, two power generation devices 360 and 370) are provided in parallel to the low-voltage distribution line 230 in a customer's house. In FIG. 3, the configuration on the power generation device 360 side and the configuration on the power generation device 370 side are the same. Therefore, in the following description, the power generation device 360 side will be described, and the description on the power generation device 370 side will be omitted.

  The PLC modem 340 separates a signal other than power (for example, a cutoff instruction signal) from the low-voltage distribution line 230 and transmits power to the low-voltage distribution line 232. In addition, the PLC modem 340 transmits a signal other than the power to the transfer blocking device 348.

  The power generator 360 is mainly configured by a switch 342, an isolated operation detector 344, and a distributed power source 346, and is connected to the low-voltage distribution line 230 via the PLC modem 340.

  The switch 342 is a state in which the distributed power source 346 and the low-voltage distribution line 232 are disconnected in the switch 342 (hereinafter referred to as an open state) or connected (hereinafter referred to as a closed state). It is.

  The distributed power source 346 is a device that can generate power by receiving, for example, the supply of sunlight or wind power. For the low-voltage distribution line 230, the switch 342, the low-voltage distribution line 232, and the PLC modem are used. 340 is connected. The distributed power source 346 can be connected to the power distribution system 1 via the low voltage distribution line 232 and the low voltage distribution line 230.

  The isolated operation detection device 344 constantly monitors, for example, the voltage, phase, frequency, and the like at the connection point between the low-voltage distribution line 232 and the power generation device 360. A passive type isolated operation detection function to detect, or a small disturbance is always given to the low-voltage distribution line 232, and the isolated operation is performed by fluctuations in the voltage, frequency, etc. of the connection point that are noticeable due to this disturbance during the isolated operation. It is equipped with an active islanding detection function for detection. The isolated operation detection device 344 detects that the distributed power source 346 is operated independently when the pole switch 41 is opened by an instruction from the power distribution distance control master station 150. 342 is switched from the closed state to the open state.

  With the configuration described above, for example, when the power supply of the distribution system 1 is stopped due to an accident in the distribution system 1, the distribution remote control master station 150 of the information processing apparatus 10 is connected to the pole via the remote control station 42. The switch 41 is switched from the closed state to the open state. The isolated operation detection device 344 opens the switch 342 from the closed state when it detects that the distributed power source 346 is in the isolated operation because the pole switch 41 is opened and the power of the distribution system 1 is not supplied. The distributed power supply is cut off from the distribution system 1 by switching to the state.

  However, for example, when a plurality of distributed power sources (for example, distributed power sources 346 and 356 as shown in FIG. 3) are connected in parallel to the distribution system 1, the isolated operation detection device 344 is connected to the distributed power source 346. May not be able to detect isolated operation.

  That is, when power is not supplied from the distribution system 1 in FIG. 3, assuming that both the switch 352 and the switch 342 are closed, the power generated by the distributed power source 356 is transmitted to the switch 352, the low-voltage distribution. The distributed power source 346 may be supplied via the electric wire 236, the PLC modem 350, the low voltage distribution line 230, the PLC modem 340, the low voltage distribution line 232, and the switch 342. Independent operation cannot be detected. Similarly, the power generated in the distributed power source 346 is distributed via the switch 342, the low voltage distribution line 232, the PLC modem 340, the low voltage distribution line 230, the PLC modem 350, the low voltage distribution line 236, and the switch 352. The isolated operation detection device 354 cannot detect the isolated operation of the distributed power source 356. In that case, the distributed power source 346 and the distributed power source 356 will continue to operate independently although the power supply by the power distribution system 1 is stopped.

  Thus, when the distributed power source 346 and the distributed power source 356 are connected in parallel to the power distribution system 1, there is a possibility that the isolated operation detection device 344 cannot detect the isolated operation of the distributed power source 346. There is a possibility that the isolated operation detection device 354 cannot detect the isolated operation of the distributed power source 356. Therefore, as a countermeasure in such a case, the distributed power source 346 and the distributed power source 356 are shut off from the power distribution system 1 by using, for example, transfer interrupting devices 348 and 358 as described below.

  The transfer interruption device 348 is connected in parallel with the low voltage distribution line 232 between the PLC modem 340 and the switch 342. When the transfer interruption device 348 receives the interruption instruction signal from the PLC modem 340, the transfer interruption device 348 forcibly transmits the interruption signal for opening the switch 342 to the switch 342. The transfer interruption device 358 is connected in parallel with the low voltage distribution line 236 between the PLC modem 350 and the switch 352. When the transfer interruption device 358 receives the interruption instruction signal from the PLC modem 350, the transfer interruption device 358 forcibly transmits the interruption signal for opening the switch 352 to the switch 352.

Thereby, even when the isolated operation detection device 344 cannot detect the isolated operation of the distributed power source 346, the switch 342 can be opened by the interruption signal transmitted from the transfer interruption device 348, and Even when the isolated operation detection device 354 cannot detect the isolated operation of the distributed power source 356, the switch 352 can be opened by the interruption signal transmitted from the transfer interruption device 358.
JP 2004-64884 A

  However, in order to connect the transfer cutoff device 348 to the PLC modem 340 and the switch 342 in parallel with the low voltage distribution line 232 drawn into the customer's house, it is necessary to newly provide a communication line different from the low voltage distribution line 232. This was a burden on consumers. Furthermore, when the transfer interrupting device 348 is additionally installed in the state where the power generation device 360 configured by the switch 342, the isolated operation detection device 344, and the distributed power source 346 shown in the figure is installed, depending on the structure of the power generation device 360, In some cases, the transfer blocking device 348 may not be easily provided. For example, the power generation device 360 may need to be modified. In particular, when the power generation device 360 is covered with one housing, the power generation device 360 must be disassembled, and it is difficult to connect the transfer interrupting device 348 to the switch 342.

  This invention is made | formed in view of this subject, The place made into the objective is to provide the interruption | blocking control apparatus of the distribution line which can interrupt | block between a distributed power supply and a distribution line reliably. .

  The invention for solving the above problems includes a first switch that is opened or closed to cut off or connect a first position of a distribution line connected to a distributed power source, and the first switch is opened. Or an open / close control unit configured to be in a closed state, and an open / close detection unit configured to detect whether the first switch is in an open state or a closed state. After the first switch is opened and the first switch is opened, the second position of the distribution line between the distributed power source and the first position of the distribution line is cut off or connected. Based on the detection output when the open / close detection unit detects that the first switch is in the open state before the second switch in the open state or the closed state is changed from the open state to the closed state. The first switch is closed.

  The first switching control unit opens the first switch based on the cutoff instruction signal, so that the distributed power source can be reliably cut off from the distribution line. Furthermore, regardless of the structure of the distributed power source or the second switch, the interruption control device can be easily provided on the distribution line connected to the distributed power source.

  In the distribution line breaker control device, a plurality of the distributed power sources and the second switches are provided, and a plurality of the breaker control devices are provided in parallel between the distribution line and the plurality of second switches. It is preferable to be provided.

  In the distribution line interruption control device, it is preferable that the distributed power source and the second switch are provided in a single package.

  Further, in the distribution line shutoff control device, the open / close control unit includes a power storage device that stores electricity based on the power supplied by the distribution line, and when the distribution line supplies power, the power of the distribution line When the distribution line does not supply power, it is preferable to operate using the power of the power storage device as a power source.

  In the distribution line cutoff control device, it is preferable that the open / close control unit has a power source independent of the distribution line.

  In this distribution line cutoff control device, the cutoff instruction signal is a signal that can be transmitted along with power in the distribution line, and the open / close control unit outputs the cutoff instruction signal other than the power in the distribution line. It is preferable to have a separate PLC (Power Line Communication) modem.

  Further, the invention for solving the above problems includes a distributed power source connected to a distribution line, a first switch that is open or closed to cut off or connect a first position of the distribution line, and A second switch that is open or closed to interrupt or connect a second position of the distribution line between the distributed power source and the first position of the distribution line; and the first switch is open or A first opening / closing control unit for closing, a second opening / closing control unit for opening or closing the second switch, and whether the first switch and the second switch are open or closed An open / close detection unit for detecting whether the first open / close control unit opens the first switch based on a shutoff instruction signal, and the second open / close control unit includes the first open / close control unit. Based on the detection output when the open / close detection unit detects that the device is in an open state, Based on the detection output when the open / close detection unit detects that both the first switch and the second switch are open, the 2 switch is opened. The first switch is in a closed state, and the second switching control unit supplies a detection output when the switching detection unit detects that the distribution line supplies power and the first switch is in a closed state. Based on the above, the second switch is closed.

  Based on the shutoff instruction signal, the first switch control unit opens the first switch, and when the first switch is opened, the second switch control unit opens the second switch, thereby distributing the distribution line. Even when a plurality of distributed power sources are connected to each other, the distributed power sources can be reliably cut off from the distribution lines.

  In the distribution line interruption control device, it is preferable that a plurality of the interruption control devices are provided in parallel to the distribution line.

In the distribution line shutoff control device, the switching detection unit is configured to control the first switch and the second switch based on a voltage at a position between the first switch and the second switch of the distribution line. It is preferable to detect whether the switch is in an open state or a closed state .

  Further, in such a distribution line shutoff control device, a phase detection unit that detects whether or not the phase of the voltage on the distributed power source side and the phase of the voltage on the distribution line side with respect to the second switch are synchronized, And the second switching control unit supplies a power to the distribution line and detects when the switching detection unit detects that the first switch is in a closed state, and the second switch The second switch is closed based on the detection output when the phase detection unit detects that the phase of the voltage on the distributed power source side and the phase of the voltage on the distribution line are synchronized with respect to It is preferable to be in a state.

Further, in the distribution line shutoff control device, the first opening / closing control unit includes a power storage device that stores electricity based on the power supplied by the distribution line, and when the distribution line supplies power, the distribution line It is preferable to operate using the power of the power storage device as a power source when the power distribution line operates as a power source and the distribution line does not supply power.
In the distribution line cutoff control device, it is preferable that the first opening / closing control unit has a power source independent of the distribution line.

In the distribution line cutoff control device, it is preferable that the second opening / closing control unit operates using the distributed power source as a power source.
In the distribution line cutoff control device, it is preferable that the second opening / closing control unit has a power source independent of the distributed power source.

  In the distribution line cutoff control device, the cutoff instruction signal is a signal that can be transmitted along with power in the distribution line, and the first opening / closing control unit receives the cutoff instruction signal other than power from the distribution line. It is preferable to have a PLC (Power Line Communication) modem that separates the two.

  ADVANTAGE OF THE INVENTION According to this invention, between a distributed power supply and a distribution line can be interrupted | blocked reliably.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

=== Configuration example of a power distribution system to which a shutoff control device is applied ===
A configuration example of a power distribution system to which the distribution line cutoff control device of the present invention is applied will be described with reference to FIG. FIG. 1 is a block diagram showing an example of a configuration of a power distribution system to which a distribution line cutoff control device according to the present invention is applied. FIG. 1 shows an example of a configuration when a plurality of power generation devices (for example, two power generation devices 404 and 406) are provided in a customer's house. In FIG. 1, parts having the same configuration as in FIG.

  The low voltage distribution line 230 is drawn into the customer's house via the PLC modem 331. The power generation device 404 is connected to the low voltage distribution line 230 via the transfer cutoff device 400, and the power generation device 406 is connected to the low voltage distribution line 230 via the transfer cutoff device 402. In this embodiment, the power generation device 404 and the power generation device 406 are connected in parallel to the low-voltage distribution line 230, but three or more power generation devices are provided in parallel to the low-voltage distribution line 230. Also good. In that case, a transfer interruption device is provided corresponding to a plurality of power generation devices.

  In this embodiment, it is assumed that the transfer blocking device 400 and the transfer blocking device 402, and the power generation device 404 and the power generation device 406 have the same configuration. Therefore, in the following description, the transfer blocking device 400 and the power generation device 404 are described, and the description of the transfer blocking device 402 and the power generation device 406 is omitted.

<< Transfer blocking device 400 >>
The transfer interrupting device 400 includes a switch 240, a switching control device 242, and a voltage detection device 244.

  The switch 240 (first switch) is provided on the low-voltage distribution line 230 side of the distribution system 1 with respect to the switch 246 described later, and the low-voltage distribution line at the installation position (first position) of the switch 240. 230 is cut off (hereinafter referred to as an open state) or connected (hereinafter referred to as a closed state).

  The switching control device (the switching control unit of claims 1, 4, 5 and 6 and the first switching control unit of claims 7, 11, 12 and 15) 242 is connected to the power distribution system 1 side (point A and Connected to the low voltage distribution line 230. In addition, the open / close control device 242 includes a PLC modem 243 that separates a signal (for example, a cutoff instruction signal) other than the electric power in the low-voltage distribution line 230. When receiving the cutoff instruction signal from the PLC modem 243, the switching control device 242 transmits a cutoff signal for opening the switch 240 to the switch 240 based on the cutoff instruction signal. The open / close control device 242 can operate regardless of whether or not power is supplied from the low-voltage distribution line 230. For example, the open / close control device 242 has a power storage device such as a capacitor (not shown) that charges based on the power supplied by the low-voltage distribution line 230, and when power is supplied to the low-voltage distribution line 230. When the power of the low-voltage distribution line 230 is operated as a power source, and the power is not supplied to the low-voltage distribution line 230, for example, the charge of the capacitor is operated as the power source. Alternatively, the open / close control device 242 may incorporate a power source (for example, a battery) independent of the low-voltage distribution line 230.

  When the switch 240 is in an open state, the voltage detection device 244 detects whether or not the voltage on the distributed power source 250 side (hereinafter referred to as point B) with respect to the switch 240 is open. And the detection result is output to the open / close control device 242.

≪Power generation device 404≫
The power generation device 404 includes a switch 246, an isolated operation detection device 248, and a distributed power source 250.

  The distributed power source 250 is a device that can generate power by receiving, for example, the supply of sunlight or wind power, and is connected to the low-voltage distribution line 230 via the switch 246 and the switch 240. The distributed power source 250 can be connected to the power distribution system 1 via the low voltage distribution line 230.

  The switch 246 (second switch) is installed in the low voltage distribution line 230 between the switch 240 and the distributed power source 250, and the distributed power source 250 and the low voltage are installed at the installation position (second position) of the switch 246. The distribution line 230 is opened or closed.

  The isolated operation detection device (second switching control unit) 248 constantly monitors, for example, the voltage, phase, frequency, etc. on the power distribution system 1 side (hereinafter referred to as C point) with respect to the switch 246, and these are used when the isolated operation is performed. A passive type isolated operation detection function that detects an isolated operation by changing the value of the value, or a minute disturbance is always given to the point C, and the voltage at the connection point that becomes noticeable due to this disturbance during the isolated operation It has an active single operation detection function that detects single operation based on changes in frequency or the like. When the isolated operation detection device 248 detects that the distributed power source 250 is in the isolated operation, the switch 246 is opened. The isolated operation detection device 248 includes a phase detector (not shown) that detects the phase of the voltage on the distributed power source 250 side (hereinafter referred to as point D) with respect to the switch 246 and the voltage at the point C. . When the switch 240 is in the closed state and the switch 246 is in the open state, the isolated operation detection device 248 supplies power to the low-voltage distribution line 230 when the pole switch 41 is closed. The switch 246 is switched from the open state to the closed state based on the output of the phase detection unit indicating that the voltages at the points C and D are synchronized. Whether the voltage at the point C and the voltage at the point D are synchronized is determined by, for example, setting the polarity at which the voltage at the point C and the point D is captured oppositely in the phase detection unit. It is possible to detect whether or not the value obtained by combining the phase of the voltage and the phase of the voltage at the point D is zero. In this case, if the value obtained by synthesizing the phase of the voltage at the point C and the phase of the voltage at the point D is 0, the value is synchronous. Further, it is assumed that the isolated operation detection device 248 can operate regardless of the supply of power by the low-voltage distribution line 230. For example, the isolated operation detection device 248 may operate using the distributed power source 250 as a power source, or may include a power source (for example, a battery) independent of the distributed power source 250.

  In the present embodiment, the voltage detection device 244 constitutes the open / close detection unit of claim 1. Further, the voltage detection device 244 and the isolated operation detection device 248 constitute an open / close detection unit of claim 7. The open / close detection unit of claim 7 may use a part of the voltage detection device 244 and the isolated operation detection device 248 or only the voltage detection device 244. For example, when the switch 240 and the switch 246 are both open and no voltage is generated at the point B, when the switch 240 is closed and power from the distribution system 1 is supplied, the voltage is applied to the point B. Therefore, it can be detected that the switch 240 is closed and the switch 246 is open at this time. As described above, it is possible to detect a change in the open / close state of the switch 240 and the switch 246 by the voltage detection device 244 based on the change in the voltage at the point B.

  Further, the transfer blocking device 400 and the transfer blocking device 402 constitute the distribution line blocking control device according to claims 1 to 6. Further, the transfer cutoff device 400 and the power generation device 404, and the transfer cutoff device 402 and the power generation device 406 constitute a distribution line cutoff control device according to claims 7 to 15.

=== Operation of the shutdown control device ===
Next, referring to FIGS. 1 and 2, the operation of connecting and disconnecting the distributed power source and the power distribution system by the wiring interrupting control device of the present invention will be described. FIG. 2 is a flowchart for explaining the operation of connection and disconnection between the distributed power source and the distribution system by the wiring interruption control device of the present invention.

  First, for convenience of explanation, it is assumed that the distributed power source 250 and the power distribution system 1 are electrically connected. In this case, the switch 240 and the switch 246 are both closed (S200).

  As the power distribution distance control master station 150 designates the pole switch 41 in the open state due to an accident in the power distribution system 1 or the like, a cutoff instruction signal is transmitted from the cutoff signal transmission device 130 according to an instruction from the power distribution distance control master station 150. Is done. The cutoff instruction signal is transmitted to the low voltage distribution line 230 together with the power of the low voltage distribution line 220 by the PLC modem 331 and separated from the power by the PLC modem 243. Then, the opening / closing control device 242 receives a cutoff instruction signal from the PLC modem 243 (S201).

  The switching control device 242 receives the cutoff instruction signal and transmits a cutoff signal for opening the switch 240 to the switch 240, and switches the switch 240 from the closed state to the open state (S202).

  The isolated operation detection device 248 detects that the distributed power source 250 is operated independently, for example, when the switch 240 is opened (S203). Then, the isolated operation detection device 248 instructs the switch 246 to change from the closed state to the open state based on the detection result (S204).

  Next, the voltage detection device 244 determines whether or not a voltage is generated at the point B, that is, whether or not both the switch 240 and the switch 246 are open (S205). If the switch 246 is not in an open state due to an abnormality of the device, or if a voltage is generated at the point B due to a long time for switching the switch 246 (S205: No), the point B Step S205 for confirming the voltage is executed again. When the voltage detection device 244 detects that no voltage is generated at the point B (S205: Yes), that is, the switch 240 and the switch 246 are both open, the switch control device 242 Based on the detection result of 244, the switch 240 is switched from the open state to the closed state (S206). After that, when the power distribution system 1 is restored and the pole switch 41 is closed, a voltage is generated at the point C because the switch 240 is closed, and the islanding operation detection device 248 causes the switch 240 to be closed. Detect that there is. Then, the phase detection unit (not shown) of the isolated operation detection device 248 determines whether or not the voltage at the point C and the voltage at the point D are synchronized (S207). When the voltage at point C and the voltage at point D are not synchronized (S207: No), step S207 is executed again. If the voltage at the point C and the voltage at the point D are not synchronized even after the step S207 is repeated a predetermined number of times, the power supply voltage of the distributed power source 250 is set to synchronize the voltage at the point C and the voltage at the point D, for example. Means for adjusting the phase may be provided. When the voltage at the point C and the voltage at the point D are synchronized (S207: Yes), the isolated operation detection device 248 indicates that the detection result that the switch 240 is closed, the voltage at the point C, and the voltage at the point D are Based on the detection output of the phase detection unit indicating synchronization, the switch 246 is switched from the open state to the closed state, and the process returns to step S200. As a result, it is possible to prevent a short circuit due to the switch 246 being closed while the voltage at the point C and the voltage at the point D are not synchronized.

  In the present embodiment, as described above, the open / close control device 242 includes, for example, a capacitor that performs charging based on the power of the low-voltage distribution line 230 or a power source that is independent of the low-voltage distribution line 230. Thus, even when power is not supplied to the low-voltage distribution line 230, the switching control device 242 can be operated by the charge of the capacitor or the power of the power source. Therefore, in step S206, regardless of whether power is supplied to the low-voltage distribution line 230, when it is detected that the switch 246 is in the open state, the switch 240 is switched from the closed state to the closed state. Can do.

  The isolated operation detection device 248 uses a distributed power source 250 as a power source or has a power source independent of the distributed power source 250. Thereby, in step S204, even if the switch 240 is in the open state, the switch 246 can be switched from the closed state to the open state.

  In the present embodiment, the open / close control device 242 has a built-in PLC modem 243, and can receive a cut-off instruction signal transmitted together with power in the low-voltage distribution line 230 by the PLC function. Therefore, it is not necessary to provide a communication line for receiving a new blocking instruction signal at the customer's house.

  As described above, the distribution line breaking device according to the present invention is capable of breaking even when the distributed power source 250 and the distributed power source 270 are connected in parallel to the low-voltage distribution line 230 to which the power of the distribution system 1 is supplied. The distributed power sources 250 and 270 can be reliably disconnected from the power distribution system 1 by opening the switches 240 and 260 by the instruction signal. Further, the transfer interrupting device 400 can be easily installed because it only needs to be connected to the low voltage distribution line 230 led out from the power generation device 404 regardless of the structure of the power generation device 404. In particular, even when the power generation device 404 including the switch 246, the independent operation detection device 248, and the distributed power source 250 is configured in one casing (package), the transfer is cut off without disassembling the casing. An apparatus 400 can be installed.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

It is a block diagram which shows an example of a structure of the power distribution system to which the cutoff control apparatus of the power distribution line of this invention is applied. It is a flowchart for demonstrating the operation | movement of connection and interruption | blocking with a distributed power supply and a power distribution system by the wiring interruption | blocking control apparatus of this invention. It is a block diagram which shows the structural example of the power distribution system to which the cutoff control apparatus of the conventional distribution line is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Information processing apparatus 20 Substation 40 Pillar transformer 41 Pillar switch 42 Far control station 34,140 M / C
DESCRIPTION OF SYMBOLS 110 Server for power distribution 120 Terminal for monitoring control 130 Transmission instruction | indication signal transmission apparatus 150 Power distribution distance control master station 160 Communication line 210 High voltage distribution line 220,230,232,236 Low voltage distribution line 240,246,260,266 Switch 242,262 Switching control device 243, 263 PLC modem 244, 264 Voltage detection device 248, 268 Isolated operation detection device 250, 270 Distributed power supply 300 Communication network 310, 320 Optical communication line 331, 340, 350 PLC modem 342, 352 Switch 344, 354 Independent operation detection device 346, 356 Distributed power source 348, 358 Transfer interruption device 360, 370 Power generation device 400, 402 Transfer interruption device 404, 406 Power generation device

Claims (15)

A first switch that is open or closed to shut off or connect a first position of a distribution line connected to a distributed power source;
An open / close control unit for opening or closing the first switch;
An open / close detection unit that detects whether the first switch is in an open state or a closed state;
The opening / closing controller is
Based on the shutoff instruction signal, the first switch is opened,
After the first switch is in an open state, the first switch is in an open state or a closed state to cut off or connect the second position of the distribution line between the distributed power source and the first position of the distribution line. 2 The first switch is closed based on the detection output when the open / close detection unit detects that the first switch is open during the period from the open state to the closed state. And
A disconnection control device for a distribution line. A plurality of the distributed power source and the second switch are provided,
2. The distribution line interruption control device according to claim 1, wherein a plurality of the interruption control apparatuses are provided in parallel between the distribution line and the plurality of second switches. 3.   The distribution control apparatus according to claim 1, wherein the distributed power source and the second switch are provided in a single package. The opening / closing controller is
A power storage device that stores electricity based on the power supplied by the distribution line,
When the distribution line supplies power, the power of the distribution line operates as a power source,
The distribution line cutoff control device according to claim 1, wherein when the distribution line does not supply power, the distribution line operates according to the power of the power storage device as a power source. The opening / closing controller is
The power distribution cutoff control device according to claim 1, further comprising a power source independent of the power distribution line. The cutoff instruction signal is a signal that can be transmitted together with power in the distribution line,
2. The distribution line interruption control device according to claim 1, wherein the opening / closing control unit includes a PLC (Power Line Communication) modem that separates the interruption instruction signal other than the electric power in the distribution line. A distributed power source connected to the distribution line;
A first switch that is open or closed to block or connect the first position of the distribution line;
A second switch that is open or closed to shut off or connect the second position of the distribution line between the distributed power source and the first position of the distribution line;
A first opening / closing control unit for opening or closing the first switch;
A second opening / closing control unit for opening or closing the second switch;
An open / close detection unit for detecting whether the first switch and the second switch are in an open state or a closed state;
The first opening / closing control unit opens the first switch based on a cutoff instruction signal,
The second opening / closing control unit opens the second switch based on a detection output when the opening / closing detection unit detects that the first switch is open.
The first open / close control unit closes the first switch based on a detection output when the open / close detection unit detects that both the first switch and the second switch are open. age,
The second switching control unit supplies the electric power to the distribution line and controls the second switch based on a detection output when the switching detection unit detects that the first switch is in a closed state. Close state,
A disconnection control device for a distribution line.   8. The distribution line interruption control device according to claim 7, wherein a plurality of the interruption control devices are provided in parallel to the distribution line. The switch detection unit is configured to determine whether the first switch and the second switch are in an open state or a closed state based on a voltage at a position between the first switch and the second switch of the distribution line. 8. The distribution line interruption control device according to claim 7, wherein whether or not the distribution line is present is detected . A phase detection unit for detecting whether or not the phase of the voltage on the distributed power source side and the phase of the voltage on the distribution line side with respect to the second switch are synchronized,
The second opening / closing controller is
A detection output when the switching detection unit detects that the distribution line supplies power and the first switch is in a closed state, and a phase of the voltage on the distributed power source side with respect to the second switch claims and phase of the voltage of the distribution line side based that are synchronized to a detection output when detected by the phase detector, for the second switch closed, the feature that Item 10. The distribution line cutoff control circuit according to Item 7 or 9 . The first opening / closing controller is
A power storage device that stores electricity based on the power supplied by the distribution line,
When the distribution line supplies power, the power of the distribution line operates as a power source,
The distribution line interruption control device according to claim 7 or 9 , wherein when the distribution line does not supply electric power, the electric power of the power storage device is operated as a power source. The first opening / closing controller is
10. The distribution line cutoff control device according to claim 7 or 9 , wherein the distribution line has a power supply independent of the distribution line. The second opening / closing controller is
The distribution line interruption control device according to claim 7 or 9 , wherein the distribution type power supply operates as a power supply. The second opening / closing controller is
The dispersed type power supply cutoff control unit of the distribution line according to claim 7 or 9, characterized in that it has an independent power supply and. The cutoff instruction signal is a signal that can be transmitted along with power in the distribution line,
Wherein the first switching control unit, blocking the distribution line according to claim 7 or 9 with a PLC (Power Line Communication) modem, it is characterized in that the separation of the blocking instruction signal other than the power in the distribution lines Control device.

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