Patent ID: 11905927
Assignee: VESTAS WIND SYSTEMS A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC B  F

Claim 12:
13. A system for monitoring operation of a wind turbine including a rotor having a blade and that rotates in a rotor plane having a plurality of sectors, the system comprising:
one or more processors; and
a memory coupled to the one or more processors and including program code that, when executed by the one or more processors, causes the system to:
receive a time-domain signal indicative of a pitch force being applied to the blade;
determine a first spectral density of the time-domain signal by sampling the time-domain signal to generate a discrete time-domain signal, selecting a plurality of samples from the discrete time-domain signal that are within a sampling window, and transforming the plurality of samples from a time-domain to a frequency-domain;
determine a condition of the wind turbine based on a frequency content of the first spectral density; and
in response to the condition being indicative of a problem with the wind turbine, generate an alarm signal,
wherein the sampling window is selected from:
a first sampling window corresponding to a wind speed that is within a predetermined wind speed range or a rate of change in the wind speed that is within a predetermined rate of change in wind speed range;
a second sampling window corresponding to a pitch position that is within a predetermined pitch position range or a rate of change in the pitch position that is within a predetermined rate of change in pitch position range; and
a third sampling window corresponding to a power output of the wind turbine that is within a predetermined power output range or a rate of change in the power output of the wind turbine that is within a predetermined rate of change in power output range.