Identification of wind turbines in closed‐loop operation in the presence of three‐dimensional turbulence wind speed: torque demand to measured generator speed loop

In order to get reliable linear models for tuning controllers in real operation conditions, a procedure for identification in closed-loop operation of wind turbine (WT) models at any time and placement is presented in this paper. This procedure has been tested using data from a nonlinear aeroelastic code, generated in a context reproducing real operation conditions of WTs, with the presence of three-dimensional turbulence. The algorithms for model identification of WTs operating in closed loop together with the corresponding validation techniques are presented. To illustrate the procedure, data from one Bladed® WT model is used. Identification and validation of the model are presented and the resulting model is analysed and its characteristics are plotted. In the final sections of the paper, the model obtained from identification in closed loop and the model obtained by linearization are comparatively tested in terms of the performances obtained with the corresponding model-based designed controllers applied to the Bladed® WT model. A description of future work concludes the paper. Copyright © 2009 John Wiley & Sons, Ltd.

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