Impact of wind turbines on power system stability

Several types of WTs have been used in wind farms, such as WT with induction generator, WT with doubly fed induction generator, and WT with direct drive permanent magnet generator, which are different in terms of power-speed characteristics, generators and ways of interfacing with power grids. In this paper, the models of the three types of WTs are presented. Simulations are performed on a single machine infinite bus system, and the fault ride-through capabilities of different types of WTs are studied. The Critical Clear Time (CCT) analysis is carried out to investigate the impact of different types of WTs on power system stability. Dynamic responses are also simulated on the four-machine system under system disturbances, the damping performances of the power system with the different types of WTs are compared.