Design of a Robust Sliding Mode Controller based on Nonlinear Modeling of Variable Speed Wind Turbine

In this article, the dynamic modeling of different electrical and mechanical parts of the nonlinear aerodynamics of variable speed wind turbine with Doubly Fed Induction Generator (DFIG) is addressed. Moreover, a high order robust sliding mode controller is employed to decrease the effects of the chattering phenomenon in the presence of stochastic wind model, parametric uncertainties in dynamical model, and mechanical power factor. The nonlinear robust control guarantees the performance and robust stability in order to reduce the effects of instabilities in the sliding surface and improve the turbine rotor speed variations for different angles of blade pitch. The simulation results confirm the convergence of turbine rotor speed output and the improvement of tracking error in the presence of system uncertainties.