Research On The Load Characteristics Of Urban Power Grids Considering The Charging Load Of Electric Vehicles

With the deepening reform of China's power system and the continuous development of the market economy,the load characteristics of the power grid are constantly changing.Analysis of the load characteristics of the grid becomes more and more important.Electric vehicles,as vehicles using clean energy,are bound to develop explosively in the contemporary environment.The ensuing huge electric vehicle charging load will have a significant impact on the electricity load of the original background grid.Study the characteristics of the load,master the laws of its changes,and provide the basis for the development of power grid control strategies and power load forecasting.Make the grid more safe,economical and reliable.Therefore,this paper studies the impact of the load characteristics of Kunming power grid and the charging load of electric vehicles on the power grid.Firstly,the load characteristic index was introduced.Principal component analysis method was used to simplify the load factor influencing factor index,and the traditional gray correlation analysis method was improved.Based on the historical load data of Kunming City,the improved gray correlation analysis method was used to influence the impact.The factors of load characteristics are quantitatively studied;with the rapid growth of electric vehicles,their impact on the power grid will be greater and greater,so qualitative analysis of the main influencing factors of the charging load of electric vehicles,and then based on the MATLAB simulation environment,using Monte Carlofa modeled the charging load of electric vehicles and predicted the electric vehicle charging load in Kunming City in 2020 according to the “13th Five-Year Plan”(including the charging load of electric cars,buses,and taxis,and three The type of total charging load);finally analyzed the electric vehicles valley charge control measures,combined with the characteristics of the background power grid,summed up the power grid load control strategy for the charging of electric vehicles,in particular,proposed control measures to eliminate hydropower,With the help of electric vehicle charging load access ratio and charging load access peak ratio The indicators to study the impact of electric vehicle charging load on the background grid electricity load.