Method for adjusting the rotational speed of a wind turbine and wind turbine

Patent metadata

Field	Value
Publication number	US-9567975-B2
Application number	US-201113822027-A
Country	US
Kind code	B2
Filing date	Aug 30, 2011
Priority date	Sep 28, 2010
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A method for operating a wind turbine ( 10 ). The wind turbine ( 10 ) is operated with variable rotational speed between predeterminable minimum and maximum rotational speeds. A characteristic variable ( 51 ) of an oscillation of the wind turbine ( 10 ) is detected. The wind turbine ( 10 ) includes a tower ( 14 ) and a rotor ( 13 ). An open-loop or closed-loop control device ( 36, 50 ) provides open-loop control or closed-loop control of the rotational speed of the rotor ( 13 ) between a minimum rotational speed and a maximum rotational speed during a power-supplying operation of the wind turbine. A sensor ( 40 ) detects a characteristic variable ( 51 ) of an oscillation of the wind turbine ( 10 ) and the minimum rotational speed is changed depending on the characteristic value ( 51 ) of the oscillation. The minimum rotational speed is altered depending on the characteristic variable ( 51 ) of the oscillation by the open-loop or closed-loop control device ( 36, 50 ).

First claim

The invention claimed is:

1. A method of operating a wind turbine ( 10 ) that supplies power, comprising:
operating the wind turbine ( 10 ) with variable rotational speed between a predeterminable minimum rotational speed and a predeterminable maximum rotational speed,
detecting a characteristic variable ( 51 ) of an oscillation of the wind turbine ( 10 ),
changing the minimum rotational speed depending on the characteristic variable ( 51 ) of the oscillation, such that an increase in the minimum rotational speed takes place at a greater rate than a reduction in the minimum rotational speed, and
operating the wind turbine ( 10 ) with variable rotational speed between the changed minimum rotational speed and the predeterminable maximum rotational speed.

2. The method according to claim 1 , wherein the minimum rotational speed is continuously changed when a predeterminable threshold value of the characteristic variable ( 51 ) of the oscillation is exceeded.

3. The method according to claim 1 , wherein the characteristic variable ( 51 ) of the oscillation is at least one of an amplitude, a direction, a frequency, a phase of the oscillation, and an acceleration of the wind turbine ( 10 ).

4. The method according to claim 1 , wherein the minimum rotational speed is based upon determination or presetting of a generator torque (M) or a generator power.

5. The method according to claim 1 , further comprising:
restricting the characteristic variable ( 51 ) of the oscillation is restricted after the characteristic variable is detected.

6. The method according to claim 1 , further comprising:
inputting the characteristic variable ( 51 ) of the oscillation into a characteristic curve ( 60 ), and
outputting a rotational speed difference ( 67 ) from the characteristic curve ( 60 ).

7. A wind turbine ( 10 ), comprising:
a tower ( 14 );
a rotor ( 13 );
a generator ( 26 ) operable with variable rotational speed;
an open-loop or closed-loop control device ( 36 , 50 ) is configured to provide open-loop control or closed-loop control of a rotational speed of the rotor ( 13 ) between a minimum rotational speed and a maximum rotational speed during a power-supplying operation of the wind turbine ( 10 ); and
a sensor ( 40 ) that detects a characteristic variable ( 51 ) of an oscillation of the wind turbine ( 10 ), wherein the open-loop or closed-loop control device ( 36 , 50 ) is further configured to change the minimum rotational speed depending on the characteristic variable ( 51 ) of the oscillation such that an increase in the minimum rotational speed takes place at a greater rate than a reduction in the minimum rotational speed.

8. The wind turbine ( 10 ) according to claim 7 , wherein the sensor ( 40 ) is an acceleration sensor.

9. The wind turbine ( 10 ) according to claim 7 , wherein the open-loop or closed-loop control device ( 36 , 50 ) is further configured to maintain the minimum rotational speed by determination or presetting of a generator torque (M) or a generator power.

10. The wind turbine ( 10 ) according to claim 7 , wherein the open-loop or closed-loop control device ( 36 , 50 ) is further configured to limit the detected characteristic variable ( 51 ) of the oscillation when changing the minimum rotational speed.

11. The wind turbine ( 10 ) according to claim 7 , wherein the open-loop or closed-loop control device ( 36 , 50 ) has a delay element ( 65 ).

12. The method according to claim 1 , wherein the characteristic variable ( 51 ) of the oscillation includes an acceleration of the wind turbine ( 10 ).

13. The method according to claim 1 , wherein the characteristic variable ( 51 ) of the oscillation includes a phase of the oscillation.

14. The wind turbine ( 10 ) according to claim 7 , wherein the sensor ( 40 ) is a strain gauge.

Assignees

• Hansen Marco
• Warfen Karsten
• Senvion Se

Inventors

• Hansen Marco
• Warfen Karsten

Classifications

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• F03D7/042

  by means of an electrical or electronic controller · CPC title

• F05B2270/327

  Rotor or generator speeds · CPC title

• F05B2270/334

  Vibration measurements · CPC title

• F03D7/0276 Primary

  controlling rotor speed, e.g. variable speed · CPC title