Methods and systems for determining a pitch angle offset signal and for controlling a rotor frequency of a rotor of a wind turbine for speed avoidance control

摘要

#$%^&*AU2011253697B220140612.pdf#####Methods and systems for determining a pitch angle offset signal and for controlling a rotor frequency of a rotor of a 5 wind turbine for speed avoidance control Abstract It is described a method for determining and applying a pitch angle offset signal for controlling a rotor frequency of a rotor of a wind turbine, the method comprising: obtaining a 10 motion quantity indicative of a motion of the rotor (221); determining the pitch angle offset signal (439) based on the motion quantity such that the pitch angle offset signal is adapted to be used for adjusting a blade pitch angle (1) of a rotor blade (219) mounted at the rotor (221) for controlling 15 the rotor frequency in order to reduce a time span during which the rotor is in a critical motion region (450). Furthermore, a corresponding system and a method for controlling a rotor frequency are provided. 20 (Figure 1)1/4 FIG1 100 110 101 1051 11311 109 104 FIG2 221 Ft(t) Fd~t) Ft(t) 2419 225 223 p(t) 232 227 239 - 9 23 vres(t) vr(t) --229 vb(t)