Active and Reactive Power control of DFIG for WECS System: PI and Anti-Windup PI Approaches

Wind energy conversion systems (WECS) require advanced control strategies to regulate the produced wind power while it’s connected to the electrical grid. The approach proposed in this work is applied to a wind power generation system based on a double fed induction generator (DFIG), which represents one of the most used technologies in the control studies because of their high energy efficiency. The proposed system basically combines a stator flux oriented control (FOC) via the rotor side converter (RSC), a maximum power point tracking (MPPT) strategy for optimal wind power extraction, and two controllers of Proportional Integral (PI) type for a decoupling regulation of active and reactive power. To reduce the effects of actuator saturation during the transient phase and improve the control performance, an anti windup system is integrated into the control loops suggested. Both the conventional PI and anti-windup PI approaches are implemented and evaluated on a DFIG machine operating in hypersynchronous mode, under different scenarios. This comparative analysis concentrates on active and reactive power tracking, dynamic response, and the stability of the overall system. The simulation results show that the contribution of the anti-windup PI strategy enhances the control robustness and improves the dynamic performance of DFIG wind power systems.