Second order sliding-mode for direct power control of DFIG under distorted grid

This study proposes a sliding-mode direct power control (SMDPC) strategy for a grid-connected bidirectional power converters feeding a doubly-fed induction generator (DFIG) with slip power recovery. The control design, based on the second-order sliding modes (SOSM) is adopted to control both converters rotor side converter (RSC) and the grid side converter (GSC). Simulations performed under Matlab/Simulink validate the feasibility of the designed SMPC. Simulation results on a 200VA DFIG system under normal and faulted grid voltage conditions demonstrate good performance of the SMPC in terms of robustness, stability and precision.