Patent ID: 7145262

Claim:
A wind turbine generator system equipped with a three phase generator connected to the shaft of a windmill, a converter connected to the stator winding of the three phase generator, and an inverter connected to the converter and also to an electric power system, in which the variable-frequency power generated by the three phase generator is converted into direct current power by the converter and then the direct-current power is converted into fixed-frequency alternating current power by the inverter comprising: a rotation speed detector that detects the rotation speed of the three phase generator; a current detector that detects the current through the stator of the three phase generator; a current controller that controls the amperage detected by the current detector and outputs a voltage command; a filter that receives the rotation speed detected by the rotation speed detector and then extracts and outputs a specified frequency component; a phase gain regulator that receives the output signal of the filter and then regulates and outputs phase and gain; and an adder that adds the signal outputted from the phase gain regulator to the current command sent to the current controller; wherein the converter comprises an IGBT.