Patent ID: 11867150
Assignee: GENERAL ELECTRIC RENOVABLES ESPANA, S.L.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 9:
10. A wind turbine system comprising:
a wind turbine including a wind turbine rotor with a plurality of blades;
a plurality of load sensors configured to measure loads on the blades;
an azimuth measurement system configured to determine an angular position of the wind turbine rotor in a rotor plane;
a control system configured to:
receive signals from the load sensors during operation of the wind turbine;
receive signals from the azimuth measurement system;
determine in-plane moments on one or more of the blades;
select the in-plane moments generated on the one or more blades at a rotor rotational speed frequency;
compare a phase angle of the selected in-plane moments with a measured azimuth phase angle; and
generate a warning signal if the phase angle of the selected in-plane moments deviates from the measured azimuth phase angle by more than a predefined threshold.