Patent ID: 11879431
Assignee: VESTAS WIND SYSTEMS A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A method of correcting blade pitch in a wind turbine having a tower and a plurality of rotor blades, the method comprising:
receiving sensor output data from one or more wind turbine sensors, the sensor output data including data indicative of excitation of the tower for a plurality of different pitch angles of a particular one of the plurality of rotor blades;
determining a corrected pitch reference of the particular one of the plurality of rotor blades, the corrected pitch reference corresponding to a minimum tower excitation based on the received sensor output data; and,
sending the corrected pitch reference to a pitch actuator system of the particular one of the plurality of rotor blades;
wherein the wind turbine is operated at each of the plurality of different pitch angles of the particular one of the plurality of rotor blades for a predetermined period to receive the sensor output data for the plurality of different pitch angles of the particular one of the plurality of rotor blades, and
wherein for each of the plurality of different pitch angles, the method further comprises:
calculating a mean operating condition of the wind turbine for each of a plurality of time intervals within the predetermined period using the sensor output data; and,
selecting a particular one of the plurality of time intervals in which the mean operating condition is within a predetermined tolerance,

wherein the corrected pitch reference is determined based on the sensor output data of the selected particular one of the plurality of time intervals for each of the plurality of different pitch angles.