Study On The Influence Of Wind Power Grid Connected Operation On Voltage Stability Of Power System

Since the late 20 th century,the energy crisis has deepened,causing a lot of environmental problems.Including carbon dioxide,sulfide,automobile exhaust and other harmful gases.These have had a serious impact on the human underlying living environment.In this thesis,the wind power generation system is introduced,the status of wind power generation at home and abroad,the characteristics of wind power generation are analyzed.This thesis compares the running characteristics of domestic constant speed wind turbines and variable speed wind turbines,and puts forward that the variable speed constant frequency generating units will be widely popularized and applied with the upgrading of technology.Based on the mathematical model of wind speed,wind farm and wind turbine,the influence of wind farm on grid voltage stability is analyzed.In particular,the concept of voltage fluctuation and flicker of grid-connected wind farm is analyzed.Measures to suppress voltage fluctuations and flicker are put forward.PSCAD software is used to simulate the wind farm in a certain area.The transient voltage stability and voltage variation curve of the ordinary asynchronous motor group are simulated and the voltage stability of SVC is improved by using dynamic reactive power compensation equipment.In the simulation of the doubly-fed induction motor,the important protection effect of the frequency converter on the voltage stability of the unit is put forward.Finally,in the simulation,by changing the short circuit capacity ratio,transmission line impedance ratio,rotor feedback control and other parameter factors,we can know that the results show that these factors can affect the voltage curve,resulting in changes in fan operating characteristics.