US 12,486,827 B2
Whirling mode control of a wind turbine based on tower measurements
Alexander Duncan Giles, Oporto (PT); and Jesper Sandberg Thomsen, Hadsten (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 18/705,625
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
PCT Filed Oct. 28, 2022, PCT No. PCT/DK2022/050223
§ 371(c)(1), (2) Date Apr. 29, 2024,
PCT Pub. No. WO2023/072355, PCT Pub. Date May 4, 2023.
Claims priority of application No. PA202170523 (DK), filed on Oct. 28, 2021.
Prior Publication US 2025/0003382 A1, Jan. 2, 2025
Int. Cl. F03D 7/02 (2006.01)
CPC F03D 7/0224 (2013.01) [F03D 7/0296 (2013.01); F05B 2270/334 (2013.01); F05B 2270/807 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A controller for a wind turbine having three rotor blades, the controller being for adjusting pitch of the three rotor blades, the controller being configured to:
receive an acceleration signal from an acceleration sensor located in a tower or a nacelle of the wind turbine, the acceleration signal being indicative of side-to-side motion of the tower or nacelle of the wind turbine;
determine a first component in a fixed coordinate frame of the wind turbine based on the received acceleration signal, the first component being indicative of a whirling mode of the wind turbine caused by edgewise vibrations of one or more of the rotor blades;
generate, based on the determined first component, a second component in the fixed coordinate frame that is orthogonal to the first component, the second component is generated by application of a second-order generalised integrator to the first component;
apply a control action to the first and second components to obtain respective first and second control components for mitigating the whirling mode;
apply an inverse m-blade coordinate transformation to the first and second control components to obtain pitch reference offset values for the respective rotor blades in a rotor coordinate frame of the wind turbine; and,
transmit a control signal to adjust pitch of the rotor blades based on the obtained pitch reference offset values.