| 摘要 |
PROBLEM TO BE SOLVED: To individually determine welding of a switch without increasing cost in a system interconnection device for a distributed power source.SOLUTION: The system interconnection device for the distributed power source includes: a reactor provided in a plurality of wires connected to an AC system power source; a capacitor of a connection wire connecting two wires between the reactor and the system power source; a normally open switch disposed between the connection wire and an inverter; a loop-shaped circuit formed from the two wires, the connection wire, the reactor, the capacitor and the switch; and a control device. The control device instructs opening to one switch of a determination object to determine whether a contact is welded among the switches, and instructs closing to the other switch. When applying a voltage to the loop-shaped circuit, in the case where a current flows to the loop-shaped circuit, it is determined that the contact of the one switch is welded (welding determination section; steps S202 to S220). |
