Advanced Control Strategy for Doubly-Fed Induction Generators in Variable-Speed Wind Turbines

Abstract:
This study investigates advanced control strategies for Doubly-Fed Induction Generators (DFIGs) in variable-speed wind turbines, addressing challenges in voltage regulation and power system stability. The research focuses on developing an integrated control approach combining active and reactive power management to optimize power extraction and ensure system reliability under fluctuating wind conditions. The methodology involves designing a PI controller for rotor current regulation in the dq reference frame, with voltage compensators to adjust rotor voltages. The DFIG model is coupled with a wind turbine via a gearbox, and simulations are conducted using variable wind speeds. Key findings demonstrate that the proposed control system effectively adjusts the mechanical rotational speed to maintain optimal power extraction, with the DFIG adapting to wind speed variations while maintaining stable active and reactive power outputs. Simulation results illustrate the control system’s responsiveness, ensuring maximum power point tracking and stable operation. The study highlights the DFIG’s ability to decouple rotor speed from stator frequency, enhancing efficiency. These findings contribute to improving the performance and grid integration of DFIG-based wind energy systems, with future research recommended for experimental validation and advanced control techniques.