| 摘要 |
<p>A system connection inverter device equipped with an inverter (50) that converts direct current output resulting from the generation of electricity by electricity generation equipment (100) into alternating current, a direct current voltage measurement unit (40) that measures the direct current voltage at the direct current input side of the inverter (50), a system connection switch (70) having two independent relay switches (71, 72) corresponding to the phases of a commercial power supply system (110) to which the inverter (50) is connected, and a control unit (90) that controls the two relay switches (71, 72). The control unit (90) opens the two relay switches (71, 72) and then changes the one relay switch (71) from the open to the closed state, and diagnoses malfunctions with the other relay switch (72) on the basis of the change in the direct current voltage before/after the changing of the state of the relay switch as measured by the direct current voltage measurement unit (40).</p> |
