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Design of a second order Sliding Mode approach for DFIG-based wind energy systems

This paper deals with the design of a second order sliding mode approach for a DFIG-based wind energy system subject to parameter variations and external disturbances. The design is based on a variable structure control computed from the second derivative of a properly chosen sliding manifold. The controller was augmented by a second order sliding mode observer to further improve its performance. The proposed approach was successfully implemented to the rotor side converter of a DFIG-based wind energy system. Its stability was assessed using the Lyapunov theory and its performance was analyzed under various operating conditions. A comparison study with a standard sliding mode approach was also conducted. Good performance, robustness and finite time convergence are among the attributes of the proposed approach.