An Improved Direct Power Control for Doubly Fed Induction Generator

A novel voltage-modulated direct power control (VM-DPC) is first designed for a back-to-back (BTB) converter in the doubly fed induction generator (DFIG) system. The proposed VM-DPC built stator stationary reference frame (??). method uses simple feed-forward and feedback structure without phase-locked loop Park transformation. Therefore, it can be easily implemented BTB converter. Another essential advantage of that transform closed-loop DFIG system into linear-time-invariant one, which analyzed through multiple linear techniques. guarantees exponential stability stiff grid as well weak-grid integration, proved based on eigenvalue analysis. Simulation results demonstrate has faster transient response than conventional vector-oriented (VOC). Also, maintains satisfactory steady-state performance at same level VOC. robustness against distorted voltage conditions parameter mismatch also tested. Finally, strategy validated an experimental hardware prototype 7.5-kW operating real time.