Wind turbine generator, active damping method thereof, and windmill tower
First Claim
1. A wind turbine generator, comprising:
- a nacelle;
a rotor;
blades;
a tower supporting the nacelle;
a pitch-angle control mechanism for controlling a pitch angle of the blades on the basis of a blade-pitch-angle command;
an accelerometer for detecting the acceleration due to vibrations;
a damping unit for calculating a pitch angle of the blades so as to cancel out the vibrations on the basis of the acceleration detected with the accelerometer and for outputting a blade-pitch-angle command for damping;
a pitch-angle control unit forcalculating a pitch angle of the blades for controlling the output of the wind turbine generator to be a predetermined value on the basis of wind speed, the rotational speed of the rotor, or the output of the wind turbine generator, andoutputting a blade-pitch-angle command for output control; and
an adder for supplying the pitch-angle control mechanism with a blade-pitch-angle command obtained by combining the blade-pitch-angle command for damping with the blade-pitch-angle command for output control;
wherein the damping unit includes a phase compensator for applying a phase compensation by a predetermined amount.
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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
12 Claims
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1. A wind turbine generator, comprising:
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a nacelle; a rotor; blades; a tower supporting the nacelle; a pitch-angle control mechanism for controlling a pitch angle of the blades on the basis of a blade-pitch-angle command; an accelerometer for detecting the acceleration due to vibrations; a damping unit for calculating a pitch angle of the blades so as to cancel out the vibrations on the basis of the acceleration detected with the accelerometer and for outputting a blade-pitch-angle command for damping; a pitch-angle control unit for calculating a pitch angle of the blades for controlling the output of the wind turbine generator to be a predetermined value on the basis of wind speed, the rotational speed of the rotor, or the output of the wind turbine generator, and outputting a blade-pitch-angle command for output control; and an adder for supplying the pitch-angle control mechanism with a blade-pitch-angle command obtained by combining the blade-pitch-angle command for damping with the blade-pitch-angle command for output control; wherein the damping unit includes a phase compensator for applying a phase compensation by a predetermined amount. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A damping method of a wind turbine generator including
a nacelle, a rotor, blades, a tower supporting the nacelle, 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 for detecting the acceleration due to vibrations, the damping method comprising: -
a damping step that calculates a pitch angle of the blades so as to cancel out the vibrations on the basis of the acceleration detected with the accelerometer, and that outputs a blade-pitch-angle command for damping; a pitch-angle control step that calculates a pitch angle of the blades to control the output of the wind turbine generator to be a predetermined value on the basis of wind speed, the rotational speed of the rotor, or the output of the wind turbine generator, and that outputs a blade-pitch-angle command for output control; and an addition step that supplies the pitch-angle control mechanism with a blade-pitch-angle command obtained by combining the blade-pitch-angle command for damping in the damping step with the blade-pitch-angle command for output control in the pitch-angle control step; wherein the damping step includes a phase compensation step that applies a phase compensation by a predetermined amount. - View Dependent Claims (9, 10, 11)
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12. A wind turbine generator, comprising:
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a nacelle; a rotor; blades; a tower supporting the nacelle; a pitch-angle control mechanism for controlling a pitch angle of the blades on the basis of a blade-pitch-angle command; an accelerometer for detecting the acceleration due to vibrations; a damping unit for calculating a pitch angle of the blades so as to cancel out the vibrations on the basis of the acceleration detected with the accelerometer and for outputting a blade-pitch-angle command to the pitch-angle control mechanism.
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Specification