DFIG wind power generation based on back-to-back PWM converter

A back-to-back PWM converter is used as the excitation power supply for the doubly-fed induction generator (DFIG) wind power generation of variable speed constant frequency (VSCF). The mathematical model and control strategy of converter which is connected between rotor and grid is analyzed. Grid-side converter adopts grid voltage oriented control scheme for achieving the stability of DC-link voltage, unity power factor of grid-side and bi-direction flowing ability of energy. Rotor-side converter adopts the stator flux linkage oriented control scheme for achieving the maximum wind-energy capturing and adjustment of reactive power of stator. The simulation model of whole system is built. The simulation results show that the scheme utilizing back-to-back PWM converter achieves unity power factor, low distortion currents, reactive power control, sub- and super-synchronous operation.