Patent ID: 8026623

Claim:
A wind turbine generator, comprising: a pitch-angle control mechanism for controlling a pitch angle of windmill blades on the basis of a blade-pitch-angle command; an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle; and an active damping unit which includes a speed estimation unit for estimating a speed from the acceleration detected with the accelerometer, and a control unit for calculating a pitch angle of the windmill blades for generating a thrust on the windmill blades so as to cancel out the vibrations of the nacelle on the basis of the speed outputted from the speed estimation unit, and for outputting a blade-pitch-angle command to the pitch-angle control mechanism; wherein the control unit includes a phase compensator for compensating for the phase of the speed outputted from the speed estimation unit by a predetermined amount, and is configured to calculate the pitch angle on the basis of the speed obtained after the phase compensation.