Patent ID: 8305780

Claim:
A power conversion apparatus comprising: a converter circuit which is connected to an AC power supply, and converts AC power to DC power; an inverter circuit which converts the DC power converted by the converter circuit to AC power of a predetermined frequency; a current detector which is configured to detect input current input from the converter circuit to the inverter circuit; a voltage detector which is configured to detect input voltage input from the converter circuit to the inverter circuit; a power value calculator which is configured to obtain a power value from the input current detected by the current detector and the input voltage detected by the voltage detector; and a droop controller which is configured to reduce output of the inverter circuit in such a manner that the power value obtained by the power value calculator is lower than a predetermined power value, wherein the droop controller is configured to reduce the output of the inverter circuit when the power value remains higher than or equal to a droop control start value, which is a value lower than the predetermined power value, for a predetermined period of time or longer.