Three-phase steady state model for unbalanced operation of grid-connected wind generation unit

A detailed mathematical model for representing steady-state operation of a Type-3 wind generator, interfaced with an unbalanced distribution system, is proposed in this paper with appropriate modifications. The Newton-Raphson three-phase power flow algorithm has been suitably modified to incorporate the model of a Doubly Fed Induction Generator (DFIG). Various modes of operation of the DFIG have been modeled along with applicable operating constraints. The operation of the DFIG may be restricted within allowable limits due to large unbalance in the distribution system. Thus, a novel strategy for enforcing limits is proposed and comparative results with method available in literature are illustrated on IEEE 123 bus distribution system. Moreover, computational burden is also compared for different IEEE distribution systems.