JP6248716B2 - Failure handling device and power supply system - Google Patents

Description

  The present invention relates to a failure handling apparatus and a power supply system.

In Patent Literature 1, when a communication unit is connected to an open / close matching unit of each solar power generation module and a failure occurs in the solar power generation system, the open / close unit is turned on or off according to the voltage value of each output terminal. Thus, it is described that the transfer of electric energy generated by the solar cell is continued or stopped.
Patent Document 1 JP2013-252046A

  When a failure occurs in a DC power source such as a solar battery with a simple configuration as much as possible without adding an improvement to an existing system such as providing a communication unit as described in Patent Document 1, from a DC power source It is desirable to shut off the output.

  A failure handling apparatus according to an aspect of the present invention includes a failure generation unit that generates a second failure when a failure detection unit that detects a first failure of a DC power supply detects a first failure of the DC power supply. And when the power conversion device that converts the direct current from the direct current power source into the alternating current performs the failure handling process due to the second failure, the interruption unit that electrically interrupts the connection between the direct current power source and the power conversion device With.

  In the failure handling apparatus, the failure generating unit may generate a failure that the power conversion device stipulates that the power conversion device performs the failure handling process in the grid connection rule as the second failure.

  In the failure handling apparatus, the failure occurrence unit may include a ground current output unit that outputs a current to the ground when the failure detection unit detects the first failure of the DC power supply.

  In the failure handling apparatus, the ground current output unit may output a current to the ground in response to the failure detection unit detecting a first failure of the DC power source determined based on a predetermined standard. .

  The failure handling apparatus further includes a current value acquisition unit that acquires a current value of a current from the DC power supply, and the interruption unit is acquired by the current value acquisition unit after the current is output to the ground by the ground current output unit. In response to the current value being smaller than the reference current value, the DC power source and the power conversion device may be electrically disconnected.

  In the failure countermeasure apparatus, when the power conversion apparatus has a non-insulated booster circuit that boosts the direct current from the direct current power source, the ground current output unit may output a direct current to the ground.

  In the above-described failure handling apparatus, when the power conversion apparatus has an insulating booster circuit that boosts the direct current from the direct current power source, the ground current output unit may output an alternating current to the ground.

  A power supply system according to an aspect of the present invention includes the failure handling device and a power conversion device, and the power conversion device detects a change in current or voltage caused by a second failure, The failure coping process is executed by stopping the operation of converting the direct current from the direct current power source into the alternating current.

  The power supply system may further include a DC power supply.

  The summary of the invention does not enumerate all the features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

It is a figure which shows an example of the system configuration | structure of the whole power supply system which concerns on this embodiment. It is a figure which shows an example of the functional block of a control part. It is a flowchart which shows an example of the process sequence in the failure countermeasure apparatus performed when the failure of a solar cell array is detected.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a diagram illustrating an example of a system configuration of the entire power supply system according to the present embodiment. The power supply system includes a solar cell array 200 and a power conditioner 10. The power conditioner 10 is an example of a power converter. The solar cell array 200 has a plurality of solar cell modules 202 connected in series. The solar cell array 200 is an example of a DC power source. The solar cell array 200 may be a single solar cell, a solar cell module in which solar cells are connected in parallel, or in series and in parallel. As the DC power source, a distributed power source other than the solar cell array 200 may be used. The distributed power source may be a gas engine, a gas turbine, a micro gas turbine, a fuel cell, a wind power generator, an electric vehicle, or a power storage system.

  The power conditioner 10 converts the DC voltage from the solar cell array 200 into an AC voltage and is connected to the system power supply 300. The system power supply 300 is an example of an AC power supply, and may be a single-phase three-wire power supply, for example. The system power supply 300 may be a three-phase power supply.

  The power conditioner 10 includes a capacitor C1, a booster circuit 20, a capacitor C2, an inverter 30, a filter circuit 40, a relay 50, a transformer L2, and a control device 80. The power conditioner 10 converts the DC voltage output from the solar cell array 200 into an AC voltage that is phase-synchronized with a system AC voltage that is an AC voltage output from the system power supply 300, and outputs the AC voltage.

  One end of the capacitor C1 is electrically connected to the positive electrode of the solar cell array 200. The other end of the capacitor C1 is electrically connected to the negative electrode of the solar cell array 200. Capacitor C <b> 1 is an example of a noise reduction circuit that reduces noise included in the DC voltage output from solar cell array 200. In other words, the capacitor C1 is an example of a smoothing filter that smoothes the DC voltage output from the solar cell array 200.

  The booster circuit 20 boosts and outputs a DC voltage with reduced noise by the capacitor C1. The booster circuit 20 is an example of a non-insulated booster circuit. The booster circuit 20 may be a so-called chopper type switching regulator. The booster circuit 20 may be configured by an insulating booster circuit having a transformer winding such as a half-bridge booster circuit or a full-bridge booster circuit.

  Capacitor C2 smoothes the DC voltage output from booster circuit 20. In other words, the capacitor C <b> 2 reduces noise included in the DC voltage output from the booster circuit 20.

  The inverter 30 includes a switch. When the switch is turned on / off, the inverter 30 converts the DC voltage output from the booster circuit 20 into an AC voltage and outputs the AC voltage to the system power supply 300 side. The inverter 30 links the power from the solar cell array 200 with the power from the system power supply 300.

  The inverter 30 may be constituted by, for example, a single-phase full-bridge PWM inverter that includes four semiconductor switches that are bridge-connected. Of the four semiconductor switches, one pair of semiconductor switches is connected in series. Of the four semiconductor switches, the other pair of semiconductor switches are connected in series and connected in parallel with the one pair of semiconductor switches.

  The filter circuit 40 reduces noise included in the AC voltage output from the inverter 30. The filter circuit 40 includes a pair of coils L1 and a capacitor C3. One end of each of the pair of coils L <b> 1 is connected to the output end of the inverter 30. The other ends of the pair of coils L1 are connected to one end and the other end of the capacitor C3.

  The relay 50 is provided on the system power supply 300 side from the filter circuit 40. Relay 50 switches whether to electrically disconnect between inverter 30 and system power supply 300. When the relay 50 is turned on, the power conditioner 10 and the system power supply 300 are electrically connected. When the relay 50 is turned off, the power conditioner 10 and the system power supply 300 are electrically disconnected.

  The power conditioner 10 further includes an output terminal 52, an output terminal 54, and an output terminal 56. A U-phase current flows through the output terminal 52. An O-phase current flows through the output terminal 54. A W-phase current flows through the output terminal 56. One transformer L2 is connected in parallel between the output terminal 52 and the output terminal 54, and the other transformer L2 is connected in parallel between the output terminal 54 and the output terminal 56. The midpoint between one transformer L2 and the other transformer L2 is grounded. The output from the inverter 30 is divided by a pair of transformers L2.

  The power conditioner 10 further includes voltage sensors 60, 62, 64a and 64b, and current sensors 70, 72 and 74. The voltage sensor 60 detects a voltage V <b> 1 corresponding to the potential difference between both ends of the solar cell array 200. The voltage sensor 62 detects a voltage V2 corresponding to a potential difference between both ends on the output side of the booster circuit 20. The voltage sensor 64 a detects a voltage V 3 a corresponding to a potential difference between the U-phase output terminal 52 and the O-phase output terminal 54 of the power conditioner 10. The voltage sensor 64 b detects a voltage V 3 b corresponding to a potential difference between the W-phase output terminal 56 and the O-phase output terminal 54 of the power conditioner 10.

  The current sensor 70 detects a current I1 output from the solar cell array 200 and flowing to the input side of the booster circuit 20. The current sensor 72 detects the current I2 output from the booster circuit 20. The current sensor 74 detects a U-phase current I3a flowing through the output terminal 52, a W-phase current I3b flowing through the output terminal 56, and an O-phase current I3c flowing through the output terminal 54.

  Control device 80 controls the boosting operation of boosting circuit 20 and the DC-AC conversion operation of inverter 30 based on voltages V1, V2, V3a, V3b and currents I1, I2, I3a, I3b, I3c and the like. The control device 80 executes failure handling processing when changes in the currents I3a, I3b, I3c or the voltages V3a, V3b satisfy a predetermined failure condition. When the change in the currents I3a, I3b, I3c or the voltages V3a, V3b satisfies a predetermined failure condition, the control device 80 performs an operation of converting the direct current from the solar cell array 200 into an alternating current as a failure handling process. Stop.

  For example, the control device 80 detects the presence or absence of a ground fault current or a leakage current based on the total value of I3a, I3b, and I3c detected by the current sensor 74. When the control device 80 detects a ground fault current or a leakage current, the control device 80 turns off the relay 50 and electrically shuts off the power conditioner 10 and the system power supply 300. Alternatively, the control device 80 stops the switching operation of the inverter 30 when detecting a ground fault current or a leakage current.

  The process in which the control device 80 turns off the relay 50 and electrically disconnects the power conditioner 10 and the system power supply 300 when a ground fault current or leakage current is detected is a failure that the power conditioner 10 executes. It is an example of coping processing. The process in which the control device 80 stops the switching operation of the inverter 30 when the ground fault current or the leakage current is detected is another example of the failure handling process executed by the power conditioner 10.

  Further, when detecting that the system power supply 300 has stopped, the control device 80 turns off the relay 50 and electrically disconnects the power conditioner 10 and the system power supply 300. The control device 80 adjusts the phase difference between the phase of the current output from the inverter 30 and the phase of the voltage, and the amplitude of the current output from the inverter 30, thereby invalidating the phase advance to the system power supply 300 side. The desired reactive power, which is power or lagging reactive power, is supplied.

  The control device 80 detects the frequency fluctuation of the output voltage of the power conditioner 10 corresponding to the voltage at the connection point, so that the system power supply 300 is stopped, that is, the power conditioner 10 is operating independently. Is detected. When the control device 80 detects a single operation of the power conditioner 10, the control device 80 turns off the relay 50 and electrically disconnects the power conditioner 10 and the system power supply 300. When the single operation of the power conditioner 10 is detected, the power conditioner 10 performs a process in which the control device 80 turns off the relay 50 and electrically disconnects the power conditioner 10 and the system power supply 300. It is another example of a failure handling process.

  Distribution board 400 is provided between power conditioner 10 and system power supply 300. Distribution board 400 has a function of detecting a ground fault current or a leakage current, and a function of electrically disconnecting between power conditioner 10 and system power supply 300 when a ground fault current or a leakage current is detected. It is good.

  The failure handling apparatus 100 includes a cutoff unit 110, a voltage sensor 114, a current sensor 116, a ground current output unit 120, and a control unit 130. The failure handling apparatus 100 is provided between the solar cell array 200 and the power conditioner 10. When the failure handling apparatus 100 detects a failure of the solar cell array 200, the failure handling apparatus 100 electrically disconnects the solar cell array 200 from the power conditioner 10.

  The blocking unit 110 includes a pair of relays 112 that electrically block between the solar cell array 200 and the power conditioner 10. The pair of relays 112 may be relays having a b contact that electrically disconnects the solar cell array 200 and the power conditioner 10 when an operation signal from the control unit 130 is input.

  The voltage sensor 114 detects the voltage output from the solar cell array 200 and applied to the failure handling apparatus 100. The current sensor 116 detects a current output from the solar cell array 200 and flowing into the failure handling apparatus 100.

  Here, while the power conditioner 10 is operating, the failure handling apparatus 100 detects that a failure has occurred in the solar cell array 200, while a relatively large current flows through the pair of relays 112. It is conceivable to actuate the relay 112. However, when a relatively large current is flowing, when the relay 112 electrically disconnects the solar cell array 200 and the power conditioner 10, a large burden is imposed on the relay 112. Therefore, when electrically interrupting between the solar cell array 200 and the power conditioner 10 while a relatively large current flows, it is preferable to use a device that can withstand a large current.

  However, devices that can withstand large currents are expensive. In addition, a device that can withstand a large current consumes a relatively large amount of power during standby. Further, since the power consumption is large, the heat generated by the device that can withstand a large current also increases. Therefore, when a device that can withstand a large current is used as the pair of relays 112, a large heat sink is required.

  According to the failure handling apparatus 100 according to the present embodiment, when a failure of the solar cell array 200 is detected, when the large current does not flow through the blocking unit 110, the blocking unit 110 causes the solar cell array 200 and the power conditioner 10 to operate. Is electrically disconnected.

  More specifically, the ground current output unit 120 outputs the current from the solar cell array 200 to the ground. The power conditioner 10 stops the operation of converting direct current from the solar cell array 200 into alternating current in response to detecting a change in current or voltage caused by the current output by the ground current output unit 120. Then, the failure handling process is executed. The ground current output unit 120 is an example of a failure generation unit that generates a second failure when the first failure of the solar cell array 200 is detected. In the present embodiment, an example will be described in which the ground current output unit 120 outputs a current to the ground in order to generate a leakage current or a ground fault current as the second failure. However, in addition to the ground current output unit 120, the failure handling apparatus 100 has other faults that generate a fault that the power conditioner 10 is prescribed to perform the fault handling process in the grid connection regulation as a second fault. A generator may be provided. As a result, no current is output from the solar cell array 200, so that a state in which no large current flows through the blocking unit 110 can be created. Then, at the stage where the power conditioner 10 executes the failure handling process, the blocking unit 110 electrically disconnects the solar cell array 200 and the power conditioner 10 from each other.

  The ground current output unit 120 includes a switch 122, a resistor 124, and a fuse 126. In response to the operation signal from the control unit 130, the switch 122 is turned on, and the current from the solar cell array 200 is output to the ground via the resistor 124 and the fuse 126. The resistor 124 suppresses the current from the solar cell array 200 to be small. In addition, when an overcurrent flows from the solar cell array 200, the fuse 126 prevents the current from the solar cell array 200 from being output to the ground and suppresses the overcurrent from flowing through the switch 122 and the resistor 124.

  When the earth current output unit 120 detects a failure of the solar cell array 200, the earth current output unit 120 outputs a current to the earth. When the ground current output unit 120 outputs a current to the ground, the control device 80 of the power conditioner 10, for example, causes the current flowing through the power conditioner 10 to be grounded due to the current output by the ground current output unit 120. It is detected as a fault current or leakage current.

  Here, in order for the power conditioner 10 to detect a ground fault current or a leakage current caused by the current output from the ground current output unit 120 to the ground, a failure occurs through each circuit included in the power conditioner 10. It is necessary to form an electrical loop with the coping apparatus 100.

  If the booster circuit 20 is a non-insulated booster circuit, even if the current output from the ground current output unit 120 to the ground is a direct current, it is connected to the failure handling apparatus 100 via each circuit included in the power conditioner 10. Thus, a loop can be formed electrically.

  On the other hand, when the booster circuit 20 is an insulation type booster circuit having a transformer, when the current output from the ground current output unit 120 to the ground is a direct current, the fault handling apparatus is provided via each circuit included in the power conditioner 10. No loop is formed electrically with 100. In this case, a ground fault current or a leakage current due to the current output from the earth current output unit 120 to the earth is not detected by the power conditioner 10. Therefore, when the booster circuit 20 is an insulated booster circuit having a transformer, the ground current output unit 120 preferably outputs an alternating current to the ground. If it is an alternating current, even a power conditioner having an insulation type booster circuit can detect and stop a ground fault current or a leakage current. Here, the alternating current is not necessarily periodic as long as the current changes with time. The ground current output unit 120 may include an inverter that converts direct current output from the solar cell array 200 into alternating current and outputs the alternating current to the ground.

  When the ground fault current or leakage current is detected, the control device 80 turns off the relay 50 and electrically shuts off the power conditioner 10 and the system power supply 300 as failure handling processing. In addition, the control device 80 stops the switching operation of the inverter 30.

  When the failure handling process is executed in the power conditioner 10, the operation of the power conditioner 10 is stopped. When the operation of the power conditioner 10 is stopped, a large current from the solar cell array 200 does not flow to the power conditioner 10. Therefore, when the operation of the power conditioner 10 is stopped, a large current does not flow through the blocking unit 110.

  When the operation of the power conditioner 10 is stopped due to the earth current output unit 120 outputting a current to the ground, the control unit 130 activates the blocking unit 110 so that the solar cell array 200, the power conditioner 10, Is electrically disconnected.

  According to the failure handling apparatus 100 according to the present embodiment, when a large current is not flowing through the blocking unit 110, the blocking unit 110 electrically blocks between the solar cell array 200 and the power conditioner 10. Since the blocking unit 110 operates when a large current is not flowing through the blocking unit 110, it is not necessary to increase the size of the relay 112 constituting the blocking unit 110. Therefore, the blocking unit 110 can be configured with an inexpensive and small device. Thereby, the power consumption of the interruption | blocking part 110 can be suppressed and it is not necessary to provide a large-sized heat sink in order to cool the interruption | blocking part 110. FIG.

  FIG. 2 is a diagram illustrating an example of functional blocks of the control unit 130. The control unit 130 includes a voltage value acquisition unit 131, a failure detection unit 132, a ground current output control unit 133, a current value acquisition unit 134, and a cutoff control unit 135.

  Each unit included in the control unit 130 is stored in a computer-readable recording medium, installs a program for performing various processes for operating the blocking unit 110 and the ground current output unit 120, and causes the computer to execute the program. May be configured. That is, the control unit 130 may be configured by causing a computer to function as each unit included in the control unit 130 by causing the computer to execute a program for performing various processing related to determination of distribution timing and distribution.

  The computer has various memories such as a CPU, ROM, RAM, and EEPROM (registered trademark), a communication bus, and an interface. The CPU reads out a processing program stored in advance in the ROM as firmware and sequentially executes the processing unit 130. Function as.

  The voltage value acquisition unit 131 acquires the voltage value of the voltage applied to the failure handling apparatus 100 detected by the voltage sensor 114. The failure detection unit 132 detects a first failure of the solar cell array 200. The failure detection unit 132 may detect a first failure of the solar cell array 200 determined based on a predetermined reference. The failure detection unit 132 may detect a first failure of the solar cell array 200 that is required to be detected based on a predetermined law or rule as a predetermined reference. For example, the failure detection unit 132 detects a first failure of the solar cell array 200 determined based on a predetermined reference based on the voltage value acquired by the voltage value acquisition unit 131. When the voltage value acquired by the voltage value acquisition unit 131 satisfies a predetermined condition, the failure detection unit 132 has a failure such as a short circuit or a ground fault in the solar cell array 200 as the first failure. Is detected. Note that the failure detection method of the solar cell array 200 in the failure detection unit 132 is not limited to the above.

  When the failure detection unit 132 detects a failure of the solar cell array 200, the earth current output control unit 133 outputs an operation signal to the earth current output unit 120 and causes the earth current output unit 120 to output a current to the ground. The earth current output unit 120 receives the operation signal from the earth current output control unit 133, turns on the switch 122, and outputs the current from the solar cell array 200 to the earth.

  The current value acquisition unit 134 acquires the current value of the current input from the solar cell array 200 via the current sensor 116. When the power conditioner 10 performs a failure handling process due to the current output from the earth current output unit 120, the shut-off control unit 135 outputs an operation signal to the shut-off unit 110, thereby The battery array 200 and the power conditioner 10 are electrically disconnected. The interruption unit 110 receives an operation signal from the interruption control unit 135 and turns off the pair of relays 112 to electrically isolate the solar cell array 200 from the power conditioner 10.

  In response to the current value acquired by the current value acquisition unit 134 being smaller than the reference current value after the current is output to the ground by the ground current output unit 120, the cutoff control unit 135 is controlled by the cutoff unit 110. The solar cell array 200 and the power conditioner 10 are electrically disconnected. When the current value acquired by the current value acquiring unit 134 becomes smaller than the reference current value after the current is output to the ground by the ground current output unit 120, the shut-off control unit 135 causes the power conditioner 10 to handle the failure. Therefore, the blocking unit 110 electrically disconnects the solar cell array 200 and the power conditioner 10 from each other.

  FIG. 3 is a flowchart illustrating an example of a processing procedure in the failure handling apparatus 100 performed when a failure of the solar cell array 200 is detected.

  First, the failure detection unit 132 detects a failure of the solar cell array 200 based on the voltage value acquired by the voltage value acquisition unit 131 (S100). When the failure detection unit 132 detects a failure of the solar cell array 200, the earth current output control unit 133 operates the earth current output unit 120 to output the current from the solar cell array 200 to the ground (S102). If the booster circuit 20 is a non-insulated booster circuit, the ground current output unit 120 outputs a direct current to the ground. If the booster circuit 20 is an insulating booster circuit, the ground current output unit 120 outputs an alternating current to the ground.

  The earth current output control unit 133 temporarily stops the operation of the earth current output unit 120 after the current is output to the earth by the earth current output unit 120 and then stops the operation of the earth current output unit 120. Is stopped from being output to the ground (S104).

  Next, the current value acquisition unit 134 acquires the current value of the current input from the solar cell array 200 via the current sensor 116 (S106). The interruption control unit 135 determines whether or not the current value acquired by the current value acquisition unit 134 is equal to or less than the reference current value (S108).

  If the current value acquired by the current value acquisition unit 134 is equal to or less than the reference current value, the interruption control unit 135 causes the power conditioner 10 to handle the failure due to the current output to the ground by the ground current output unit 120. Therefore, the blocking unit 110 electrically blocks the solar cell array 200 and the power conditioner 10 (S110).

  On the other hand, if the voltage value acquired by the current value acquisition unit 134 is larger than the reference current value, the interruption control unit 135 causes the power conditioner 10 to still fail due to the current output to the ground by the ground current output unit 120. When it is determined that the countermeasure processing is not executed, the ground current output control unit 133 operates the ground current output unit 120 again and outputs the current from the solar cell array 200 to the ground. When the current value acquired by the current value acquisition unit 134 becomes equal to or lower than the reference current value, the cutoff control unit 135 electrically connects the solar cell array 200 and the power conditioner 10 by the cutoff unit 110. Shut off.

  As described above, according to the failure handling apparatus 100 according to the present embodiment, when a failure of the solar cell array 200 is detected, a ground fault current or leakage is intentionally caused to the power conditioner 10 by outputting a current to the ground. A fault such as a current is detected, and the power conditioner 10 is caused to execute a fault handling process. As described above, since the power conditioner 10 performs the fault handling process by outputting the current to the ground, the power conditioner 10 is not improved without adding a communication unit or the like. The operation of 10 can be stopped so that no current is output from the solar cell array 200. Then, when no current is output from the solar cell array 200, the shut-off control unit 135 can electrically shut off the solar cell array 200 and the power conditioner 10 by the shut-off unit 110.

  Therefore, according to the failure handling apparatus 100 according to the present embodiment, when a large current does not flow through the blocking unit 110, the blocking unit 110 electrically blocks between the solar cell array 200 and the power conditioner 10. it can. Since the blocking unit 110 operates when a large current is not flowing through the blocking unit 110, it is not necessary to increase the size of the relay 112 constituting the blocking unit 110. Therefore, the blocking unit 110 can be configured with an inexpensive and small device. Thereby, the power consumption of the interruption | blocking part 110 can be suppressed and it is not necessary to provide a large-sized heat sink in order to cool the interruption | blocking part 110. FIG.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  In the present embodiment, the ground fault current or the leakage current is cited as the failure that the power conditioner 10 performs the failure handling process. However, the failure that the power conditioner 10 performs the failure handling process may be another failure. In that case, the failure handling apparatus 100 may include, as a failure generation unit, other failure generation units that generate other failures detected by the power conditioner 10 in addition to the ground current output unit 120 that outputs current to the ground. .

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Power conditioner 20 Booster circuit 30 Inverter 40 Filter circuit 50 Relay C1, C2, C3 Capacitor 52, 54, 56 Output terminal 60, 62, 64a, 64b Voltage sensor 70, 72, 74 Current sensor 80 Control apparatus 100 Failure countermeasure apparatus 110 Blocking Unit 112 Relay 114 Voltage Sensor 116 Current Sensor 120 Ground Current Output Unit 122 Switch 124 Resistance 126 Fuse 130 Control Unit 131 Voltage Value Acquisition Unit 132 Failure Detection Unit 133 Earth Current Output Control Unit 134 Current Value Acquisition Unit 135 Blocking Control Unit 200 Solar cell array 202 Solar cell module 300 System power supply 400 Distribution board

Claims (9)

A fault generating unit that generates a second fault when the first fault of the DC power source is detected by a fault detecting unit that detects a first fault of the DC power source;
When the power conversion device that converts the direct current from the direct current power source into the alternating current performs a failure handling process due to the second failure, the power conversion device electrically disconnects between the direct current power source and the power conversion device. A failure handling apparatus comprising a blocking unit.   The fault handling apparatus according to claim 1, wherein the fault generation unit generates a fault that is specified in the grid interconnection regulation that the power conversion apparatus performs fault handling processing as the second fault.   The said fault generation part contains the earth current output part which outputs an electric current to earth, when the said 1st fault of the said DC power supply is detected by the said fault detection part. Troubleshooting device.   The ground current output unit outputs a current to the ground in response to the failure detection unit detecting the first failure of the DC power source determined based on a predetermined criterion. Troubleshooting device described in 1. A current value acquisition unit for acquiring a current value of a current from the DC power supply;
In response to the current value acquired by the current value acquisition unit becoming smaller than a reference current value after the current is output to the ground by the ground current output unit, The failure handling apparatus according to claim 3, wherein the apparatus is electrically disconnected from the power conversion apparatus.   6. The device according to claim 3, wherein when the power conversion device includes a non-insulated booster circuit that boosts a direct current from the direct current power source, the ground current output unit outputs a direct current to the ground. The failure countermeasure apparatus as described in one.   The ground current output unit outputs an alternating current to the ground when the power conversion device has an insulation type boosting circuit that boosts the direct current from the direct current power source. Troubleshooting device described in one. The failure handling apparatus according to any one of claims 1 to 7,
Comprising the power converter,
In response to detecting the second failure, the power conversion device stops the operation of converting the direct current from the direct current power source into alternating current, thereby executing the failure handling process.   The power supply system according to claim 8, further comprising the DC power supply.

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