Studies Of Voltage Stability Effect Caused By Wind Power Integration

Due to the strong development of wind power around the world,the capacity of the wind power integrated into the grid is gradually increasing,connected to the grid voltage level is becoming higher and higher,and the wind power technology is increasingly tend to be mature.However,because of the wind power has its own characteristics,when the wind power integrated into grid,it will bring some influence on the operation of the grid.In this paper has analyzed the stability of voltage,the main contents are as follows:Firstly,created a constant speed and double-fed wind turbine mathematical model,builded a simulation model of wind turbines in Digsilent/Power Factory,and introduced the topology structure and access methods of wind farm.Secondly,the analysis of the voltage stability of wind power integration,mainly divides into the static voltage stability analysis and transient voltage stability analysis.In the static voltage stability analysis,considered the wind farm node processing methods in power flow calculation,used the DPL to draw the PV curve, analysized the changes in static voltage stability under different influencing factors,summed up the ways to improve the static voltage stability.Mainly used the time-domain simulation method and the CCT to analysis the transient voltage stability changes under the different influencing factors,and summed up the ways to improve the transient voltage stability.Finally,on the wind farm grid voltage stability and control problems,in this paper considered the coordination control between the wind farm reactive power source,and put forward a reactive power and voltage control strategy.Based on the analysis of wind farm internal losses and terminal voltage deviation,established the optimal control model and the objective function,and used the improved particle swarm algorithm to analysize,presented a simulation of a typical wind power grid system at MATLAB environment,the simulation results show the control strategy can improve the internal network losses and the wind farm terminal voltage on the basis of meet the requirements of PCC voltage,and had great feasibility in improve the economic and stability of the grid.