Abstract
A nonlinear backstepping flux observer (BFO) for two control strategies applied to directly driven wind synchronous generator is proposed. A backstepping control (BC) and a sliding mode control (SMC) strategies are developed for both converters: the stator side converter (SSC) and the grid side converter (GSC). Using Lyapunov stability technique, one may guarantee the global stability of the wind energy conversion. The efficiency of the two non linear control strategies has been proved in terms of tracking and precision. Then, a comparative study between four possible combinations of control is illustrated and simulation results have shown high performances of the wind system controlled by BC strategy. Finally, stator resistance variation is introduced and it proves the robustness of the BC strategy applied to both converters with the BFO.
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