Wind turbine control for drivetrain load variations

A wind turbine control system comprising:

• a signal processing module comprising one or more processors programmed to perform an operation, the operation comprising:
• receiving a signal indicative of a speed of an electrical generator;
• filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band to generate a disturbance signal;
• phase shifting a phase of the disturbance signal to match a phase of torque variations of a rotor at the frequencies of the selected disturbance frequency band to generate a phase shifted signal;
• and
• the control system further being adapted to:
• receive a signal indicative of a requested output power;
• generate a modification signal based on a sum of the phase shifted signal and the signal indicative of the requested output power;
• and
• control the wind turbine using the modification signal.

A computer program product comprising a non-transitory computer readable medium storing software code which, when executed, performs an operation to control a wind turbine comprising (i) a rotor having one or more blades and (ii) an electrical generator, the rotor being connected to the electrical generator by a drivetrain;

• the operation comprising:
• receiving a signal indicative of a speed of the electrical generator and receiving a signal indicative of a requested output power;
• filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band to generate a disturbance signal;
• phase shifting a phase of the disturbance signal to match a phase of torque variations of the rotor at the frequencies of the selected disturbance frequency band to generate a phase shifted signal;
• generating a modification signal based a sum of the phase shifted signal and the signal indicative of the requested output power;
• and
• controlling the wind turbine using the modification signal.