Abstract

A conventional sliding mode (SMC) and second-order sliding mode (SOSMC) control schemes based on pulse width modulation (PWM) for the rotor side converter (RSC) and grid side converter (GSC) feeding a doubly fed induction generator (DFIG) are presented in this paper. The proportional integral (PI) controllers for wind turbine system (WTS) driven-DFIG have shown many limitations such as parameter adjustment difficulties, sensibility to DFIG parameter variations and poor robustness. Therefore, nonlinear controllers based on SMC and SOSMC are proposed to improve the wind energy conversion efficiency and the system robustness by controlling the RSC and GSC at a constant switching frequency. The proposed controllers turn-out to be more robust against parameter variations of the DFIG and external disturbances. In addition, the SMC and SOSMC approaches can optimize the WTS production, i.e. improve quality of energy produced and energy efficiency. Detailed simulation studies of WTS under various conditions are carried out in MATLAB/Simulink software, and the results confirm the robustness of the proposed control techniques.

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