Blade angle adjustment rate limit adjustment

Patent metadata

Field	Value
Publication number	US-9309866-B2
Application number	US-92097809-A
Country	US
Kind code	B2
Filing date	Feb 23, 2009
Priority date	Mar 6, 2008
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A method for the operation of a wind power plant ( 11 ) with a rotor ( 9 ), which has at least one rotor blade ( 10 ), wherein at least one part of the rotor blade ( 10 ) will be or is rotated around a longitudinal axis of the rotor blade ( 10 ) by a blade angle ( ) wherein the rotation of the at least one part of the rotor blade ( 10 ) occurs with a pre-settable blade angle adjustment rate (θ), wherein the rotor ( 9 ) is operated speed variably and wherein the blade angle adjustment rate ( ) is restricted by a pre-settable blade angle adjustment rate limit (G, G′, G 1 -G 4 ). Furthermore, a wind power plant ( 11 ) with a rotor ( 9 ), which receives at least one rotor blade ( 10 ), wherein at least one part of the rotor blade ( 10 ) is rotatable around a longitudinal axis of the rotor blade ( 10 ) by a blade angle ( ), wherein a blade angle adjustment rate is pre-settable and the blade angle adjustment rate ( ) is restricted by a blade angle adjustment rate limit (G, G′, G 1 -G 4 ).

First claim

The invention claimed is:

1. A method for the operation of a wind power plant ( 11 ) with a rotor ( 9 ), which has at least one rotor blade ( 10 ), comprising the steps of:
rotating at least one part of the rotor blade ( 10 ) around a longitudinal axis of the rotor blade ( 10 ) by a blade angle ( ),
wherein the rotation of the at least one part of the rotor blade ( 10 ) occurs with a pre-settable blade angle adjustment rate ( ),
wherein the rotor ( 9 ) is operated speed variably and wherein the blade angle adjustment rate ( ) is restricted by a pre-settable blade angle adjustment rate limit (G, G′, G 1 -G 4 ), and
wherein a variable blade angle adjustment rate limit (G, G′, G 1 -G 4 ), is changed depending on at least one operating parameter of the wind power plant ( 11 )
wherein via a blade angle adjustment rate limit adjustment limit, a value of the adjustment rate of the blade angle adjustment rate limit (G) is reduced or restricted.

2. The method according to claim 1 , wherein the blade angle adjustment rate limit (G, G′, G 1 -G 4 ) is determined before or with its adjustment.

3. The method according to claim 1 , wherein a variable blade angle adjustment rate limit (G 1 , G 2 ) is provided for a negative blade angle adjustment rate ( ).

4. The method according to claim 1 , wherein a first variable blade angle adjustment rate limit (G 3 , G 4 ) is provided for a positive blade angle adjustment rate ( ) and a second variable blade angle adjustment rate limit (G 1 , G 2 ) is provided for a negative blade angle adjustment rate ( ).

5. The method according to claim 4 , wherein the absolute values of the first and the second variable blade angle adjustment rate limit (G, G′, G 1 -G 4 ) are different at the same rotor rotational speed.

6. The method according to claim 1 , wherein at negative blade angle adjustment rates ( ) a characteristic line of the blade angle adjustment rate limit (G, G′, G 1 -G 4 ) is provided depending on the rotational speed (n),
wherein a highest blade angle adjustment rate limit (G 1 ) is provided below a lower pre-settable limit speed (n 1 ) and a lowest blade angle adjustment rate limit (G 2 ) is provided above an upper pre-settable limit speed (n 2 ), and
wherein a constant characteristic line is provided between the highest and the lowest blade angle adjustment rate limit (G 1 , G 2 ).

7. The method according to claim 6 , wherein a linear and/or quadratic characteristic line is provided between the highest and the lowest blade angle adjustment rate limit (G 1 , G 2 ) or a linear and/or quadratic portion is present in the characteristic line.

8. The method according to claim 1 , wherein the at least one operating parameter of the wind power plant is the rotor rotational speed (n) and further comprising the step of performing a rotational speed capture in a rotor hub ( 41 ) of the wind power plant ( 11 ).

9. The method according to claim 1 , wherein the at least one operating parameter of the wind power plant is the rotor rotational speed (n) and the rotor rotational speed (n) is filtered for the determination of the variable blade angle adjustment rate limit (G, G′, G 1 -G 4 ).

10. The method according to claim 1 , wherein at negative blade angle adjustment rates ( ), the highest blade angle adjustment rate limit (G 1 , G 3 ) in terms of absolute values is between 3% through 15%, below the nominal rotational speed (nn) of the wind power plant ( 11 ) and towards higher rotational speeds (n).

11. The method according to claim 6 , wherein the blade angle adjustment rate limit determined via the characteristic line is not directly the current blade angle adjustment rate limit, but rather a value that lies between the blade angle adjustment rate limit determined form the characteristic line and a previous blade angle adjustment rate limit.

12. The method according to claim 1 , wherein the at least one operating parameter of the wind power plant is the rotor rotational speed (n) and wherein in the case of a deviation of the rotational speed from a nominal rotational speed (nn), the blade angle adjustment rate limit (G, G′) is adjusted without causing a reduction in the rotational speed deviation.

13. The method according to claim 1 , wherein the at least one operating parameter of the wind power plant is the rotor rotational speed (n) and wherein in the case of a deviation of the rotational speed from a nominal rotational speed (nn), the blade angle adjustment rate limit (G, G′) is adjusted such that a permissible blade angle adjustment rate ( ) is restricted or limited in order to reach the nominal rotational speed (nn).

14. The method of claim 1 , wherein the at least one operating parameter of the wind power plant is the rotor rotational speed (n) and/or at least one environmental parameter.

15. The method of claim 14 , wherein the at least one operating parameter is the rotor rotational speed (n).

16. The method of claim 12 , wherein the deviation of the rotational speed from a nominal rotational speed is a shortfall of the nominal rotational speed (nn).

17. The method of claim 13 , wherein the deviation of the rotational speed from a nominal rotational speed is a shortfall of the nominal rotational speed (nn).

18. A non-transitory machine readable medium encoded with program code that causes a control or regulation device ( 42 ) of a wind power plant ( 11 ) to execute the method according to claim 1 .

19. A wind power plant ( 11 ) comprising:
a rotor ( 9 ), which has at least one rotor blade ( 10 ),
wherein at least one part of the rotor blade ( 10 ) is rotatable around a longitudinal axis of the rotor blade ( 10 ) by a blade angle ( ),
wherein a blade angle adjustment rate ( ) is pre-settable and the blade angle adjustment rate ( ) is restricted by a blade angle adjustment rate limit (G, G′, G 1 -G 4 ),
wherein a control or regulation device ( 42 ) is provided for the blade angle adjustment rate ( ), in which the blade angle adjustment rate limit (G, G′, G 1 -G 4 ) is provided as a variable blade angle adjustment rate limit (G, G′, G 1 -G 4 ), which will be or is adjusted depending on the rotor rotational speed (n)
wherein an adjustment module ( 44 ) is provided for the blade angle adjustment rate limit (G, G′, G 1 -G 4 ), by means of which a value of the increase of the blade angle adjustment rate ( ) is reducible and by means of which a value of the adjustment rate of the blade angle adjustment rate limit (G) is reducible or restricted.

20. The wind power plant according to claim 19 , wherein the control or regulation device ( 42 ) has a blade angle adjustment rate limit determination device ( 43 ).

21. The wind power plant according to claim 20 , wherein the blade angle adjustment rate limit determination device ( 43 ) has a characteristic line of the blade angle adjustment rate limit (G, G′, G 1 -G 4 ) depending on the rotational speed (n) of the wind power plant.

22. The wind power plant according to claim 19 , wherein a rotational speed capturing device ( 34 ) is provided.

23. The wind power plant according to claim 19 , wherein a filter is provided for a measured rotor rotational speed (n).

24. The wind power plant of claim 22 , wherein the rotational speed capturing device ( 34 ) is provided in or on the rotor hub ( 41 ).

Assignees

• Warfen Karsten
• Leweke Henning
• Senvion Se

Inventors

• Warfen Karsten
• Leweke Henning

Classifications

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• Y02E10/723

  Cross-Sectional Technologies · mapped topic

• F05B2270/304

  Spool rotational speed · CPC title

• F03D7/0224 Primary

  Adjusting blade pitch · CPC title

• Y02E10/721

  Cross-Sectional Technologies · mapped topic