Granted Patent B2

US 7,586,205 · App. 11/960,150 · Granted Sep 8, 2009

Abstract

Claims (24)

1. Method for the regulation of the rotational speed ( 52 ) of a rotor ( 11 , 11 ′) of a wind turbine ( 10 ) with a generator ( 12 ) and at least one rotor blade ( 15 , 15 ′), wherein a blade angle ( 54 ) (pitch) of the rotor blade ( 15 , 15 ′) is provided as a first set value and the torque ( 51 ) of the generator ( 12 ) is provided as a second set value, comprising the following steps:

Providing a first rotational speed target value ( 28 ) as the input value for a blade angle control or regulation device ( 32 ); and

Calculating a second rotational speed target value ( 29 ), as the input value for a torque control or regulation device ( 33 ), wherein the first and the second rotational speed target value ( 28 , 29 ) can be different from each other, wherein the first and the second rotational speed target value ( 28 , 29 ) are different from each other in a transition area from partial load and full load of the wind turbine; and

Regulating rotational speed of the rotor by changing blade angle using the blade angle control or regulation device

Regulating rotational speed of the rotor of the generator by changing the torque using the torque control or regulation device and in full load of the wind turbine the rotational speed of the rotor is regulated by changing the blade angle using the blade angle control or regulation device and in partial load of the wind turbine the rotational speed of the rotor is regulated by changing the torque of the generator using the torque control or regulation device.

2. Method according to claim 1 , wherein a third rotational speed target value ( 27 ) is provided, and wherein the first and the second rotational speed target value ( 28 , 29 ) are determined from the third rotational speed target value ( 27 ).

3. Method according to claim 1 , wherein the first rotational speed target value ( 28 ) is determined from a difference ( 30 ) between a torque target value ( 21 ) and a torque actual value ( 20 ) (torque difference ( 30 )).

4. Method according to claim 3 , wherein the torque difference ( 30 ) contributes to the determination of the first rotational speed target value ( 28 ) as a linear term.

5. Method according to claim 3 , wherein the determination of the first rotational speed target value ( 28 ) comprises an addition of the third rotational speed target value ( 27 ) and the function k 1 ×torque difference×θ (torque difference), wherein θ is the Heaviside function.

6. Method according to claim 3 , wherein the determination of the second rotational speed target value ( 29 ) comprises a subtraction of the function k 2 ×blade angle difference×θ (blade angle difference) from the third rotational speed target value ( 27 ), wherein θ is the Heaviside function.

7. Method according to claim 1 , wherein the second rotational speed target value ( 29 ) is determined from a blade angle target value ( 34 ) and/or a difference ( 31 ) of a blade angle target value ( 34 ) and a blade angle actual value ( 38 ) (blade angle difference ( 31 )).

8. Method according to claim 7 , wherein the blade angle difference ( 31 ) contributes to the determination of the second rotational speed target value ( 29 ) as a linear term.

9. The method of claim 1 , wherein the first and second rotation speed target values can be different from each other at the same instant in time.

10. Method for the regulation of the rotational speed ( 52 ) of a rotor ( 11 , 11 ′) of a wind turbine ( 10 ) with a generator ( 12 ) and at least one rotor blade ( 15 , 15 ′), wherein a blade angle ( 54 ) (pitch) of the rotor blade ( 15 , 15 ′) is provided as a first set value and the torque ( 51 ) of the generator ( 12 ) is provided as a second set value, comprising the following steps:

Providing a first rotational speed target value ( 28 ) as the input value for a blade angle control or regulation device ( 32 );

Providing a second rotational speed target value ( 29 ) as the input value for a torque control or regulation device ( 33 ), wherein the first and the second rotational speed target value ( 28 , 29 ) can be different from each other;

wherein a third rotational speed target value ( 27 ) is provided, and wherein the first and the second rotational speed target value ( 28 , 29 ) are determined from the third rotational speed target value ( 27 ); and

wherein the third rotational speed target value ( 27 ) is determined from a torque actual value ( 20 ).

11. Method according to claim 10 , wherein the third rotational speed target value ( 27 ), in particular with a, in particular specifiable, time delay, tracks the torque actual value ( 20 ).

12. Method for the regulation of the rotational speed ( 52 ) of a rotor ( 11 , 11 ′) of a wind turbine ( 10 ) with a generator ( 12 ) and at least one rotor blade ( 15 , 15 ′), wherein a blade angle ( 54 ) (pitch) of the rotor blade ( 15 , 15 ′) is provided as a first set value and the torque ( 51 ) of the generator ( 12 ) is provided as a second set value, comprising the following steps:

Providing a first rotational speed target value ( 28 ) as the input value for a blade angle control or regulation device ( 32 );

Providing a second rotational speed target value ( 29 ) as the input value for a torque control or regulation device ( 33 ), wherein the first and the second rotational speed target value ( 28 , 29 ) can be different from each other;

wherein a third rotational speed target value ( 27 ) is provided, and wherein the first and the second rotational speed target value ( 28 , 29 ) are determined from the third rotational speed target value ( 27 ); and

wherein in the case of the exceeding of an, in particular specifiable, difference between a rotational speed actual value from the first, second and/or third rotational speed target value and/or in the case of the exceeding of an, in particular specifiable, value of the torque difference, the rotational speed of the rotor is quickly reduced.

Assignments (8)