Wind turbine generator, active damping method thereof, and windmill tower
First Claim
1. 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 includesa speed estimation unit for estimating a speed from the acceleration detected with the accelerometer, anda 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.
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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
20 Claims
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1. A wind turbine generator, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An active damping method of 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, and an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle, the active damping method comprising: -
integrating the acceleration detected with the accelerometer; applying a phase compensation by a predetermined amount, on the basis of the result of the integration and the phase compensation, 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, and outputting a blade-pitch-angle command to the pitch-angle control mechanism. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An active damping method of 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, and an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle, the active damping method comprising: -
an active damping step comprising estimating a speed from the acceleration detected with the accelerometer; compensating for the phase of the estimated speed by a predetermined amount, on the basis of the speed obtained after the phase compensation, 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, and outputting a blade-pitch-angle command for damping; a pitch-angle control step comprising; calculating a pitch angle of the windmill 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 a windmill rotor, or the output of the wind turbine generator, and outputting a blade-pitch-angle command for output control; and a blade-pitch-angle command combination step comprising supplying the pitch-angle control mechanism with a blade-pitch-angle command obtained by combining (i) the blade-pitch-angle command for damping obtained in the active damping step with al the blade-pitch-angle command for output control obtained in the pitch-angle control step. - View Dependent Claims (18, 19)
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20. An active damping method of 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, and an accelerometer, attached to a nacelle, for detecting the acceleration due to vibrations of the nacelle, the active damping method comprising: -
integrating the acceleration detected with the accelerometer; applying a phase compensation to the integrated acceleration by a predetermined amount, on the basis of the integration and the phase compensation, 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, combining the calculated pitch angle with other information to produce a combined pitch angle value, applying a limiting operation to the combined pitch angle value or to a rate of variation of the combined pitch angle value, and outputting a blade-pitch-angle command to the pitch-angle control mechanism based on the combined pitch angle value after the limiting operation has been applied.
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Specification