LVRT Control Strategy of GSC Passive Sliding Mode Control for Doubly-Fed wind Turbine

The voltage drops at the connection point of the DFIG induction motor unit, caused by a power grid failure, poses a significant risk for disconnecting the DFIG from the grid. Furthermore, the continuous increase in wind power penetration exacerbates the adverse impact of off-grid operation on the power system. Therefore, it is imperative to enhance the low-voltage ride-through (L VRT) characteristics of DFIG through control strategies. In this study, considering the strong dependence on system parameters and weak anti-interference ability of passive control methods, we introduce a sliding mode structure into passive control and improve the internal current loop of DFIG converter using passive sliding mode techniques. Consequently, we establish a passive sliding mode GSC control model to enhance L VRT characteristics of DFIG. Time domain simulations are conducted to compare L VRT performance before and after implementing passive sliding mode control strategy to validate its superiority.