| CPC F03D 17/00 (2016.05) [F05B 2270/327 (2013.01); F05B 2270/329 (2013.01)] | 12 Claims |
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1. A method for operating a wind turbine, the wind turbine including a rotor with rotor blades, the method comprising:
determining reliability of an azimuth measurement system in the wind turbine by:
measuring loads with load sensors during operation of the wind turbine;
based on the measured loads, determining in-plane moments generated on one or more of the blades at a rotational speed frequency of the rotor;
determining that the azimuth measurement system has reduced reliability when if the angular phase of the in-plane moments at the rotor rotational speed frequency of the rotor deviates from an angular phase measured by the azimuth measurement system by more than a first threshold value;
generating a warning signal or changing operation of the wind turbine when it is determined that the azimuth measurement system has reduced reliability.
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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.
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