Study On Voltage Stability Of Power Distribution System With The Combination Of Distributed Generation

In recent years,with the increasing environmental pollution and energy crisis,Distributed Power Generation Technology(DG)has developed rapidly because of its flexibility,cleanliness and high efficiency.Compared with the traditional power source,distributed generation is closer to the user group in distance,which has the ability to adjust according to the actual situation of the user,saving the operation and investment cost of the power grid.However,the distributed power supply is connected to the distribution network,which changes the distribution network from the original single-supply radiation structure to the multi-supply structure,thus affecting the static voltage stability of the distribution network.Subject to environmental and economic factors,the operation of the power system will be closer to the limit state,and the stability problem of power system will become more and more prominent.On the basis of analyzing the characteristics of various distributed power supply,this thesis mainly studied the effect of the addition of energy storage system on the voltage stability of the distributed power distribution system,which has remarkable effect in cutting peaks and valleys,load balance and improving voltage stability,and can also reduce energy waste and environmental pollution,which is an effective supplement to the traditional power grid.In order to analyze the influence of energy storage system on the voltage stability of distribution grid with distributed power supply,a steady-state model of dual-feed wind turbine,photovoltaic power generation array and energy storage system was established,and on the basis of considering the impact of energy storage system,the simulation of voltage stability analysis was carried out on the power system,photovoltaic system and landscape joint system distribution network,so as to study the impact of the voltage stability of the system.In the MATLAB/Simulink environment,the scenery joint system with or without energy storage module is simulated,and the improvement effect of energy storage system on grid-connected node voltage is studied.Through simulation,the voltage stability problem of distributed power distribution network is analyzed,and the concept of Improved L Figure is put forward to verify the correctness of the indicator by simulation study.The effect of the addition of energy storage system on the voltage stability of the distribution network is analyzed quantitatively.