A Fixed Speed Induction Generator Model for Unbalanced Power Flow Analysis

This paper proposes a model of the induction generator for the phase-domain power flow analysis of fixed speed wind turbine generating systems connected to balanced or unbalanced three-phase distribution systems. The proposed model is established by using a modified bi-quadratic equation, which is generally used for the calculation of node voltages in the power flow analysis of distribution systems. The main advantage of the proposed model is that it does not require slip information. Thus, it has computational efficiency when compared with the slip calculation based phase-domain induction generator model. In addition, for several unbalanced voltage cases, the numerical results of the proposed model, slip calculation based phase-domain model and time-domain d-q model are comparatively evaluated to show the validity of the proposed one.