Monitoring of blade frequencies of a wind turbine

Details Monitoring of blade frequencies of a wind turbine Monitoring of blade frequencies of a wind turbine

2008-08-07

2011-10-18

Cuevas, Pedro J (Department: 2839)

Prime-mover dynamo plants

Electric control

Fluid-current motors

C290S043000, C290S054000, C290S055000

Reexamination Certificate

active

08039981

ABSTRACT:
A method for monitoring blade frequencies of a wind turbine and a monitoring system are provided. An accelerometer is attached to a rotating hub of a wind turbine measuring vibrations of the hub. To extract vibration signals originating from each blade, the vibration signals are combined with measuring signals from the azimuth angle sensor. Alternatively, the azimuth angle is found by using the measured accelerations in two directions representing the centrifugal forces and vibrating forces of the hub and feeding these signals into a phase locked loop unit establishing a phase of the rotating hub representing the azimuth angle. To extract each blade frequency, a Fast Fourier Transformation is used on the signals from the accelerometer. To monitor a severe change in each blade frequency, each blade frequency is compared to other blade frequencies and an alarm is set when a given level is reached and the wind turbine is stopped.

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