| 摘要 |
PROBLEM TO BE SOLVED: To suppress an influence of a capacitor, needed in an interconnection operation, in an autonomous operation.SOLUTION: Interconnections U1, W1, and N1 are provided on an output side of an inverter circuit 10 which converts a direct current into an alternating current. In a linked operation, a link switch 31 is closed so as to output the alternating current from the inverter circuit 10 to an electric power system 60 through the interconnections U1 and W1 (namely, single-phase two-line output). In an autonomous operation, the link switch unit 31 is turned off so as to disconnect the interconnections U1 and W1 from the electric power system 60, and an autonomous switch unit 32 is turned on so as to achieve single-phase three-line output to an autonomous load part 80. While capacitors C1 and C2 are always connected between the interconnections U1 and N1 and the interconnections W1 and N1, a series circuit of a switch 101 and a capacitor C3 is provided between the interconnections U1 and W1. In the linked operation, the switch 101 is turned on to connect the capacitor C3 between the interconnections U1 and W1, but in the autonomous operation, the switch 101 is turned off to break the connection. |
