Optimised parameter design of proportional integral and resonant current regulator for doubly fed induction generator during grid voltage distortion

The study presents an optimised parameter design of the proportional integral and resonant (PIR) current regulator for doubly fed induction generator (DFIG) under distorted grid voltage conditions. Based on the mathematical model of DFIG under distorted grid voltage conditions, practical PIR current regulator under synchronous frame is developed to implement the harmonic control target of sinusoidal stator current. The optimised parameter design of PIR regulator is investigated concerning the control system gain margin and phase margin, as well as variation of the resonant bandwidth. The influence of DFIG parameters and grid frequency deviation on PIR design is also discussed. Correctness of the optimised parameter design technique of PIR regulator is validated by the MATLAB simulation and experiment results.