Patent ID: 8324751

Claim:
A wind turbine generator system comprising: a wind turbine generator connected to a power system; a power storage apparatus capable of being charged with power generated by the wind turbine generator or power supplied from the power system; and a charge/discharge controller that is capable of bidirectional communication with the wind turbine generator and controls charging and discharging of the power storage apparatus, wherein the wind turbine generator includes a generator which is controlled based on a maximum active power, as an active power command value, which can be output by the generator and which outputs active power, the wind turbine generator outputs active power resultant from subtracting auxiliary machine loss, which is power consumed by an auxiliary machine, from the active power output from the generator, and the charge/discharge controller causes the power storage apparatus to be charged with part of the active power output from the wind turbine generator in a case where the active power output from the wind turbine generator exceeds a limited power value set for a power transmission end.