Patent ID: 9062656
Filing Date: 2015-06-23
Classification: F03D,F05B,Y02E

Abstract:
1. A control arrangement for controlling a rotor speed of a rotor of a wind turbine, the wind turbine further comprising a pitch actuator for adjusting a pitch of a blade of the rotor, the control arrangement comprising: a gain component configured to receive a speed error signal and to generate a modified speed error signal, wherein the speed error signal is based on a difference between a reference rotor speed and a measured rotor speed; and a gain schedule component coupled with the gain component and configured to influence the generation of the modified speed error signal using an error gain schedule that is based on a magnitude of the received speed error signal, wherein for at least a portion of the error gain schedule corresponding to a first range of magnitudes of the speed error signal, a slope of values of the error gain schedule increases along with increasing magnitudes of the speed error signal, and wherein the control arrangement produces a pitch control signal for the pitch actuator that is based on the generated modified speed error signal.