Patent ID: 8155920

Claim:
Method for the determination of a nacelle-inclination of a wind-turbine, comprising: measuring an acceleration of the nacelle; determining an offset-value, resulting from a calibration; calculating a first difference-signal by subtracting the offset-value from the measured acceleration; calculating a second difference-signal by subtracting a feedback-signal from the first difference-signal; integrating the second difference-signal to form a first integrated signal; multiplying the second difference-signal by a factor to calculate a first corrected signal, the factor results from the calibration; adding the second difference-signal and the first corrected signal to form a first sum-signal; integrating the first sum-signal to calculate a second integrated signal; multiplying the first sum-signal by the factor to calculate a second corrected signal; adding the second corrected signal and the second integrated signal to form a second sum-signal; multiplying the second sum-signal with a equivalent tower height to calculate a third corrected signal; applying an arctangent of the third corrected signal is calculated to get a first nacelle-signal; filtering the first nacelle-signal by a low-pass-filter to calculate the nacelle inclination; and applying the sine of the first nacelle-signal and multiplying the result with a gravity-acceleration to calculate the feedback-signal.