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A robust control algorithm for wind turbines subjected to a wide range of wind variation, grid disturbance and parameter uncertainties is presented. The algorithm utilizes fuzzy systems based on “Takagi-Sugeno” (TS) fuzzy models to approximate nonlinear systems. TS fuzzy systems are classified into three families based on the input matrices and a robust controller synthesis procedure is given for each family. This algorithm combines the merits of: (i) the capability for dealing with non-linear uncertain systems; (ii) the powerful Linear Matrix Equalities (LME) approach to obtain control gains. The control scheme is tested for different real profiles of wind speed pattern and provides satisfactory results.
Date of Conference: 3-5 March 2011