Grid Connection Control of DFIG Wind Power Generation Based on PSCAD

The stator flux-oriented vector control theory is adopted for megawatt double-fed induction generator (DFIG). Rotor excitation current is regulated according to grid voltage and rotor speed to realize no-load grid connection of DFIG. The control strategy is switched after grid connection successfully to realize maximum power point tracking (MPPT) and power decoupled control. The control of the rotor-side converter adopts voltage outer loop and current inner loop before grid connection, power outer loop and current inner loop after grid connection. The variable speed constant frequency (VSCF) wind power generation system is developed based on PSCAD/EMTDC. The effectiveness of the proposed strategy is validated by simulation results.