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

Methods and systems for determining a pitch angle offset signal and for controlling the rotor frequency of a rotor of a wind turbine for anti-speed control A method for determining and applying a pitch angle offset signal to control a rotor frequency of a rotor of a wind turbine is described, the method comprising: obtaining an amount of momentum representative of a motion of the rotor 221; To control the rotor frequency to reduce the time interval while the rotor is in the critical kinetic zone 450, the blade pitch angle of the rotor blade 219 mounted on the rotor 221 and determining the pitch angle offset signal 439 based on the momentum such that the pitch angle offset signal is adjusted to be used to adjust the pitch angle offset signal beta. Also provided is a method for controlling a corresponding system and rotor frequency.