Abstract—With the increasing penetration of wind energy generation into power system, the impact of wind farms on power grids performance and stability control is of growing concern. Firstly there is a introduction of basic principles related to small signal stability analysis. Then a new method of improving small signal stability is proposed in this paper. The method, based on optimization adjustment of time constant of the phase shift link of PSS, is verified to be effective by an instance analysis of simulation in DIgSILENT/Power Factory. Three-machine Nine Nodes Model is used in this simulation.

Index Terms—Small signal stability, PSS, wind farms.

Zilan Zhao, Wenying Liu are with the School of Electrical and Electronic Engineering, North China Electric Power University, 102206, Beijing, China (e-mail: 347162287@qq.com)
Xubin Han is with Gansu Electric Power Research Institute, 730070, Gansu , China