CPC F03D 7/0224 (2013.01) [F03D 7/0296 (2013.01); F05B 2260/966 (2013.01); F05B 2270/328 (2013.01); F05B 2270/331 (2013.01); F05B 2270/334 (2013.01); F05B 2270/342 (2020.08); F05B 2270/703 (2013.01)] | 16 Claims |
1. A rotor control system for actuating pitch of pitch adjustable rotor blades of a wind turbine, the rotor control system comprising:
a pitch actuating unit for determining a pitch modification signal 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, the edgewise load signal being measured in a rotating reference frame;
apply an m-blade coordinate transformation to the edgewise load signal to transform the edgewise load signal to a whirling reference frame along a first and a second reference direction;
select a signal component of either the first or the second reference direction to obtain a selected signal component;
filter the selected signal component at either a backward whirling frequency or a forward whirling frequency to obtain a filtered signal component;
apply an inverse m-blade coordinate transformation to the filtered signal component to obtain the pitch modification signal, wherein only a whirling mode of either backward or forward whirling is targeted in obtaining the pitch modification signal; and
apply the pitch modification signal to the pitch actuator.
|