There is provided a power converter apparatus including a detector detecting a system voltage, and a controller stably outputting power generated by the wind power generator to the power system based on a power instruction value and controlling an output voltage to stabilize the system voltage based on a voltage instruction value in a case where the system voltage is within a preset range, and controlling an active current component and a reactive current component of an output current to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage is outside the preset range.