WIND TURBINE GENERATOR, ACTIVE DAMPING METHOD THEREOF, AND WINDMILL TOWER
1 Assignment
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Accused Products
Abstract
A wind turbine generator, an active damping method thereof, and a windmill tower in which vibrations of the wind turbine generator itself or the windmill tower can be reduced at low cost are provided. The acceleration due to vibrations of a nacelle is detected with an accelerometer attached to the nacelle. In an active damping unit, a pitch angle of windmill blades for generating a thrust on the windmill blades so as to cancel out the vibrations of the nacelle is calculated on the basis of the acceleration, and the pitch angle is output as a blade-pitch-angle command δθ* for damping. On the other hand, in a pitch-angle control unit, a pitch angle of the windmill blades for controlling the output to be a predetermined value is calculated, and the pitch angle is output as a blade-pitch-angle command θ* for output control. The blade-pitch-angle command δθ* for damping is combined with the blade-pitch-angle command θ* for output control using a subtracter. The pitch angle of the windmill blades is controlled on the basis of the resulting blade-pitch-angle command after combining.
10 Citations
22 Claims
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1-12. -12. (canceled)
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13. A wind turbine generator comprising a plurality of blades attached to a hub within a nacelle and a mechanism for active damping of the wind turbine generator including a pitch-angle control mechanism for controlling a pitch angle of the blades on the basis of a blade-pitch-angle command, and an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle, wherein the mechanism comprises:
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(a) a phase compensator which applies phase compensation by a predetermined amount, (b) an integrator coupled to the phase compensator, (c) a device which, on the basis of the results of the integration and the phase compensation, calculates a pitch angle of the blades so as to generate a thrust on the blades which tends to cancel out the vibrations on the nacelle, and (d) a device for providing a blade-pitch-angle command to the pitch angle control mechanism based on the calculated pitch angle and other information. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A wind turbine generator comprising a plurality of blades attached to a hub within a nacelle and a mechanism for active damping of the wind turbine generator including a pitch-angle control mechanism for controlling a pitch angle of the blades on the basis of a blade-pitch-angle command, and an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle, wherein the mechanism comprises:
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a phase compensator which applies phase compensation by a predetermined amount, an integrator coupled to the phase compensator, a calculation device which, on the basis of the results of the integration and the phase compensation, calculates a pitch angle of the windmill blades so as to generate a thrust on the windmill blades which tends to cancel out the vibrations on the nacelle, a combiner coupled to the calculation device which produces a blade-pitch-angle command value taking into account the pitch angle calculated by the calculation device and other information, a limiter coupled to the calculation device for limiting a pitch angle value or the rate of variation of a pitch angle value, a device for providing the blade-pitch-angle command to the pitch angle control mechanism based on the calculated pitch angle.
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Specification