US 11,927,173 B2
Imbalance estimation for the wind rotor of a wind turbine
Kirk Pierce, Lafayette, CO (US)
Assigned to SIEMENS GAMESA RENEWABLE ENERGY A/S, Brande (DK)
Appl. No. 18/027,770
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
PCT Filed Sep. 10, 2021, PCT No. PCT/EP2021/074949
§ 371(c)(1), (2) Date Mar. 22, 2023,
PCT Pub. No. WO2022/069190, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 20198948 (EP), filed on Sep. 29, 2020.
Prior Publication US 2023/0340942 A1, Oct. 26, 2023
Int. Cl. F03D 13/35 (2016.01)
CPC F03D 13/35 (2016.05) [F05B 2260/78 (2013.01); F05B 2260/966 (2013.01); F05B 2270/334 (2013.01); F05B 2270/404 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for compensating an imbalance of a wind rotor of a wind turbine, the method comprising
applying at least two test-offsets, one after the other, to a parameter characterizing a state of the wind rotor, wherein the imbalance depends on the parameter;
measuring for the at least two test-offsets an acceleration of the wind turbine, wherein the acceleration depends on the imbalance; and
determining a compensation-offset based on the acceleration, wherein the imbalance is at least partially compensated, when the compensation-offset is applied to the parameter, wherein determining the compensation-offset comprises;
determining, for each of the at least two test-offsets, a frequency component of a frequency spectrum of the acceleration,
mapping each of the frequency components to a coordinate system,
determining a center defined by each of the frequency components, wherein the center is defined as a center of gravity of a geometric shape defined by each of the frequency components, and
calculating the compensation-offset based on the center, wherein the parameter comprises a plurality of blade parameters, each characterizing a different blade of a plurality of blades of the wind rotor, wherein each blade parameter comprises a blade pitch.