Patent ID: 7692322
Filing Date: 2010-04-06
Classification: F03D,F05B,Y02B,Y02E

Abstract:
1. A wind turbine generator including a pitch-angle control mechanism for controlling a pitch angle of windmill blades on the basis of a blade-pitch-angle command, the wind turbine generator comprising: an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle; and an active damping 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 acceleration detected with the accelerometer and for outputting a blade-pitch-angle command to the pitch-angle control mechanism, wherein the active damping unit 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 output from the speed estimation unit; and wherein the control unit includes a phase-lead compensator for advancing the phase of the speed output from the speed estimation unit by a predetermined amount, and calculates the pitch angle on the basis of the speed obtained after the phase-lead compensation.