| 摘要 |
<P>PROBLEM TO BE SOLVED: To confirm that both a switch for interconnection and an inverter circuit portion are normal and then start operation in interconnection with a commercial system in safety. <P>SOLUTION: A system interconnection inverter device includes: the inverter circuit portion 2 that converts the direct-current power of a direct-current power supply 1 into alternating-current power; an output voltage detector 9 that detects the output voltage of the inverter circuit portion 2; the switch 7 for interconnection that establishes interconnection between the inverter circuit portion 2 and the commercial system 8; a system voltage detector 11 that detects the voltage of the commercial system 8; and a control circuit portion 6 that controls the inverter circuit portion 2 and the switch 7 for interconnection. The control circuit portion 6 confirms that the switch 7 for interconnection is open based on a detection value from the output voltage detector 9 and then starts the inverter circuit portion 2. When the detection value from the output voltage detector 9 and a detection value from the system voltage detector 11 become thereafter substantially equal to each other, the control circuit portion 6 carries out control to close the switch 7 for interconnection. <P>COPYRIGHT: (C)2007,JPO&INPIT |
