Research on the Impact of Integrated Wind Farm on Static Voltage Stability of Power System

Abstract

With the large-scale wind farm connected to the power grid, the impact on voltage stability is more serious. The research on the static voltage stability can better reflect the operation status of the system, the position of the weak buses and the voltage stability margin. This paper first analyzes the load margin index and the principle of the continuous power flow (CPF) algorithm. Then, the sensitivity index is used to determine the weak area of the system. And the P-V curves of these vulnerable buses are solved by CPF algorithm. Finally, after the wind farm is connected to the system, the impact of power injection of wind, line impedance ratio X/R and wind farm loads on the static voltage stability is discussed. To improve voltage stability, the reactive power compensation measure by grouped switched capacitors is proposed. Simulation results of the IEEE 30-bus system verify the correctness and effectiveness.