Three-Phase Steady-State Model of Doubly Fed Induction Generator Considering Various Rotor Speeds

This paper presents a new unbalanced steady-state model of doubly fed induction generator (DFIG) for the three-phase load flow analysis. The existing unbalanced DFIG steady-state model does not consider the effects of different rotor speeds. However, the steady-state model of DFIG changes significantly when it operates at supersynchronous or subsynchronous speeds. In this paper, a new unbalanced steady-state model for DFIG operating at different speeds is discussed in detail. Furthermore, the positive-sequence active power in this model is simulated more precise than the existing DFIG models. The proposed model is validated on CIGRE six-bus test system and can be used to initialize the transient simulation for unbalanced active distribution networks.