US 12,173,694 B2
Reduction of edgewise vibrations using blade load signal
Alexander Duncan Giles, Oporto (PT); Jesper Sandberg Thomsen, Hadsten (DK); and Gustavo Oliveira Violato, Risskov (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 18/260,466
Filed by VESTAS WIND SYSTEMS A/S, Aarhus (DK)
PCT Filed Jan. 3, 2022, PCT No. PCT/DK2022/050002
§ 371(c)(1), (2) Date Jul. 5, 2023,
PCT Pub. No. WO2022/148516, PCT Pub. Date Jul. 14, 2022.
Claims priority of application No. PA 2021 70006 (DK), filed on Jan. 6, 2021.
Prior Publication US 2024/0068443 A1, Feb. 29, 2024
Int. Cl. F03D 7/02 (2006.01); F03D 13/20 (2016.01)
CPC F03D 7/0298 (2023.08) [F03D 7/0224 (2013.01); F03D 13/201 (2023.08); F05B 2240/912 (2013.01); F05B 2260/96 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotor control system for actuating pitch of pitch adjustable rotor blades of a wind turbine, the rotor control system comprising a pitch actuation unit for determining pitch modification signals to be applied to a pitch actuator for actuating the pitch of the pitch adjustable rotor blades; the pitch actuation unit being arranged to:
receive an edgewise load signal for each of the pitch adjustable rotor blades;
apply an m-blade coordinate transformation to the edgewise load signal to transform the edgewise load signal to a reference frame along a first and a second reference direction, thereby providing a first signal component and a second signal component;
input the first signal component and the second signal component in a primary whirling controller unit to provide a first primary whirling signal component and a second primary whirling signal component, respectively, wherein the primary whirling controller unit comprises:
a primary notch filter at a first whirling frequency;
a primary signal gain;
wherein the primary notch filter at the first whirling frequency and the primary signal gain are applied to the first signal component and the second signal component to provide a first resulting signal component as the first primary whirling signal component and a second resulting signal component as the second primary whirling signal component;
apply an inverse m-blade coordinate transformation to the first resulting signal component and the second resulting signal component to obtain the pitch modification signals; and
apply the pitch modification signals to the pitch actuator.