| 摘要 |
PURPOSE:To make the constitution small and inexpensive by providing an a series circuit of AC switch and pseudo AC load in parallel to the AC output side of an inverter. CONSTITUTION:When output voltage of a solar battery 1 becomes above the interconnection threshold value voltage higher than inverter operation threshold value voltage, a sequence control circuit 7 is interconnected to a commercial power system by turning on a first AC switch 6 and turning off a second AC switch 18, and further permits output of an adder 11, inhibits output of a pseudo current instruction circuit 20, and an inverter 3 starts normal system interconnection operation. When the output voltage of the solar battery 1 lowers below the inverter operation threshold value voltage, the inverter 3 is stopped by a sequence control circuit 7 and the first AC switch 6 becomes OFF and is separated from the system and at the same time the second AC switch 18 becomes ON. |
