Wind turbine generator, active damping method thereof, and windmill tower
First Claim
1. 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:
- (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,(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, and(e) a limiter coupled to the device (c) for limiting a blade pitch angle or for limiting a rate of variation of the blade pitch angle.
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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.
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Citations
26 Claims
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1. 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, (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, and (e) a limiter coupled to the device (c) for limiting a blade pitch angle or for limiting a rate of variation of the blade pitch angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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, wherein the phase compensation comprises at least one of phase lag compensation or phase lead compensation, a calculation 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, 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification