METHOD OF DAMPING TOWER VIBRATIONS OF A WIND TURBINE AND CONTROL SYSTEM FOR WIND TURBINES

摘要

- a pitch control unit (13) which is designed to establish a pitch reference signal representing a pitch to be set by the pitch actuator system; - a rotor speed input (1) designed for receiving a rotor speed signal representing the speed of the rotor; - a speed reference input (3) designed for receiving a speed reference signal for the rotor speed; - an inclination signal input (5) designed for receiving a signal representing an inclination of the tower; and - a pitch reference output (7) designed for outputting the pitch reference signal. It further comprises a modification unit (9) which is connected to the speed reference input (1) for receiving the speed reference signal and to the inclination signal input (5) for receiving the inclination signal. The modification unit (9) is designed to establish a modification signal on the basis of the inclination signal, to modify the speed reference signal by means of the modification signal, and to output a modified speed reference signal. The pitch control (13) unit is connected to the modification unit (9) to receive the rr.cdified speed reference signal and designed to establish the pitch reference value at least on the basis of the difference between the modified speed reference signal and the rotor speed signal. Figure 1