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Variable-speed wind energy conversion systems (WECSs) have become increasingly important in recent years as they enable obtainment of maximal output power in the fields of the low and average wind speeds. In this study, we focus on WECS using doubly-fed induction generators (DFIGs) and present models for the turbine and doubly-fed induction generator. The main objective is to study two types of nonlinear controls; sliding mode and backstepping used for control of the grid-side converter will be also studied and analyzed. Matlab / Simulink simulation results are included.

Analytical Study of Nonlinear Controls Applied to Wind Energy Conversion Systems Using a DFIG