Study On The Impact Of Wind Power Grid Integration To The Voltage Stability Of Power System

With the gradual depletion of fossil energy and the increasingly serious environmental problems,the renewable energy which is represented by wind power has attracted more and more attention.Due to the random,intermittent and non-regulated characteristics of wind power,coupled with the increase of the total installed capacity of wind power,the influence of wind power integration on the safe operation of the system especially the voltage stability is more and more big,so it is very necessary to study the influence of wind power integration on the voltage stability of the system.Firstly,on the basis of the thorough research on the working principle of the wind power generation system,the wind power system model of the wind speed,aerodynamic model,mechanical model,pitch control model,traditional IG model,DFIG model are discussed,which forms a complete wind turbine model suitable for dynamic calculation.Secondly,the steady-state mathematical model of the double fed induction generator and the power flow calculation method are combined to determine the power flow calculation method of the double fed wind power generation system.This paper takes wind farm which is connected to IEEE 14 bus system as an example for power flow calculation,and the effects of centralized and distributed two different access modes of wind power on the reactive power,voltage and network loss of the system are analyzed,and the static voltage stability of different access mode to system is analyzed quantitatively by using the static voltage stability index,and the advantages of the proposed scheme are verified.Finally,the simulation model of example power system is designed by Matlab/Simulink tool.Under different conditions such as various wind speed,different permeability and transmission line fault,the system is simulated and analyzed.In addition,the effect of static compensator STATCOM on transient voltage stability is respectively studied.