Fault Ride Through Behaviour of a Six-Phase DFIG Under Grid Voltage Dip

Riding grid sags has been a challenging issue for traditional doubly fed induction generator-based wind turbine systems. Multiphase wind turbine generators have been taken rarely into account as potential ones to increase the reliability especially in the offshore area. There is a lack of investigating the dynamic behavior of multiphase wind turbine generators in the literature. By considering the effect of the full grid voltage dip, this paper investigates thus different fault ride through measures on a six-phase doubly fed induction generator. Among well-known software-based solutions such as demagnetizing current injection and stator current feedback methods, a new voltage perturbation system is presented.