Abstract
A new online identification method for estimating the time-varying aerodynamic damping of a wind turbine is proposed. Through a combination of measured aeroelastic response data and an aeroelastic wind turbine model, the time-varying aerodynamic damping matrix can be identified with the aid of the real-time Discrete Wavelet Transform (DWT) technique. The proposed method is validated by means of a 13-DOF aero-servo-elastic wind turbine model, which is used to mimic the in situ aeroelastic response of the NREL 5 MW wind turbine. A measurement noise sensitivity survey is conducted. Results from current DWT-based estimation method are compared with those from previously proposed Continues Wavelet Transform (CWT)-based estimation method and found to be superior in terms of accuracy and efficiency.
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