| 摘要 |
PROBLEM TO BE SOLVED: To provide a system connection inverter device for preventing individual operation of a device body by appropriately detecting the power failure fault of a power system, irrespective of the load is connected, and an individual operation detection method. SOLUTION: This system connection inverter device converts a DC power from a DC power supply 1 into an AC power by a power-converting device 2 and outputs the power to a power system 7 via a connection switcher 6. The device is provided with a voltage detector 9 for detecting a system voltage Vs at the primary side of the connection switcher 6 and a known disturbance generator 16 or the like for detecting the state of individual operation, and at the same time, is provided with a system voltage fluctuation detector 17 for monitoring fluctuation generated in the voltage Vs, a second disturbance generator 18 for giving disturbance with a specific voltage Vs based on the detection result, a second individual operation detection circuit 19 for performing decision regarding an individual operation state by detecting the fluctuation of the voltage Vs in synchronization with the disturbance, and a gate block circuit 15 for stopping the operation of the power-converting device 2 according to the detection and decision result. |
