SYSTEM-COOPERATIVE INVERTER

摘要

In a system-cooperative inverter device in cooperation with an alternating current power system, the inverter device is safely stopped when an abnormal state of an electrolytic capacitor is detected. An inverter device (1) in cooperation with an alternating current power system includes an inverter (21) to invert a direct current power supplied from a solar battery (11) to an alternating current power and connects an output of the inverter (21) to an alternating current power system. The inverter device (1) is provided with a pair of direct current busses (5, 6) to connect a direct current power source to the inverter (21), a pair of series connected capacitors (15a, 15b) connected between the busses (6, 7), a switch means (12) inserted in either the bus (6) on the positive pole or the bus (7) on the negative pole, voltage monitor means (16a, 16b) to monitor terminal voltages of the pair of capacitors (15a, 15b), respectively, and a control means (22: CPU) to control switching of the switching means in response to the monitor voltages detected by the voltage monitor means.