Mechanism Research on the Influence of Large Scale Wind Power Integration on Power System Angle Stability

Abstract

Base on the equivalent external characteristics of doubly-fed induction generator (DFIG) during the period of the fault and the power characteristic equation of delivery system, a novel method of eliminating equivalent mutual impedance is proposed to research the influence mechanism of different wind power penetration rate, the SG dispatch pattern and siting of wind farms on system transient power angle stability (TPAS) under fault condition are researched. The results show that system power angle characteristics are improved with the increase of the wind power scale. However, when the wind power scale reaches a certain level, the power angle stability promptly deteriorates. The distance of wind farms siting away from a SG group with leading power angle, as well as the generation reduction of the SG group, plays an important role in the improvement of TPAS. The effectiveness of the proposed method is verified by the numerical simulations of the two-machine power system.