Power system static voltage stability analysis including large-scale wind farms and system weak nodes identification

摘要

Wind turbines are different to traditional generators which have the ability of adjusting the active output according to the load demands. The output of wind turbines active power depends on uncontrollable wind speed. Therefore, it will have a deep impact on the flow distribution and power system stability after the large-scale wind farms connected to the power system. The paper builds wind turbine static model which adapt to power flow calculation including wind farms, and on this basis, this paper put forward a static voltage analysis method considering the characteristics of the wind farms. On the basis of conventional continuous power flow, the method consider that wind turbines cannot adjust active output according to system requirements, and different kinds of wind turbines have different reactive power support to system, and wind farms have different impact on the stability of the system under different wind speed and so on. The method integrated multiple voltage stability indices to identify weak bus of voltage stability in power system. Apply this method to the yunnan power grid.