Studies On Voltage Stability Of Xinjiang Part Power Grid About Integrated With Wind Farms

With the increasing share of the wind power in the power system, the impact of its integration is becoming more important. In fact,region grid which have a lot of wind resource is not strong mostly and reactive power characteristics of wind power, which cause the voltage stability issues about wind farm integration are pop out.This paper build induction machine based constant speed wind turbine model and DFIG based variable speed wind turbine model. The mechanism of voltage stability deterioration of the power grid with the wind farm integration is analyzed. The P-V curve and V-Q curve methods are generally applied to analyze the steady-state voltage stability. The power grid steady-state voltage stability is compared and studied by the DFIG based wind farm case and the IG based wind farm case. The power grid transient-state voltage stability is also compared and studied by the DFIG based wind farm case and the IG based wind farm case. This paper give fault limit removal time at vary active power of wind power. Dynamic reactive power compensation(SVC and STATCOM)can improve transient-state voltage stability of the IG based wind farm. Finally, low voltage rid through of wind farm is discussed.Study shows the power grid steady-state voltage stability and transient-state voltage stability in the DFIG based wind farm case is better than that in the IG based wind farm case. Dynamic reactive power compensation(SVC and STATCOM)can improve transient-state voltage stability of the IG based wind farm. This paper give specific numerical value in the steady-state voltage stability case and in the transient -state voltage stability case, which offer reference for Xinjiang power grid about large scale wind farm integration.