Analysis of Influencing Factors on Transient Voltage Stability of a Grid-connected DFIG-based Wind Farm

Abstract

A simulation model of WSCC three-machine nine-node system integrated with a wind farm based on double fed induction generator (DFIG) was established using the power system analysis toolbox PSAT, and the outlet bus of DFIG was set as PV node. Some influencing factors on the transient voltage stability of grid-connected wind farm were analyzed, when short circuit fault occurs in the power grid side. The results show that fault clearing time, capacity of wind farm, location of short circuit fault, and reactive power compensation have all influences on the transient voltage stability of the wind farm. According to different locations of short circuit in the power grid, the grid-connected wind farm has different minimum capacity which can guarantee the transient voltage stability. The static var compensator (SVC) installed in the wind farm can improve the transient voltage stability only for the short circuit point which is far from the grid entry point of wind farm in electrical distance.