Research On Key Technology Of Intelligent Orderly Charging Of Electric Vehicle

With the reduction of fossil energy and serious environmental pollution in recent years,also because of the rapid development of electric vehicle related technology,especially electric vehicle power battery technology and battery charging technology progress,the number of electric vehicles has increased rapidly in recent years,corresponding the total power at the time of charging reaches a high value,have an adverse impact on the operation of the grid,to study the impact of electric vehicle charging on the power grid,adjust the electric car charging process,so that reducing the adverse effects of electric vehicle charging on the grid is of great significance.This paper studies the charging methods commonly used in electric vehicles,and compares the characteristics of different charging methods.For the impact of electric vehicle charging on the power grid,through the actual circuit of the analysis,this paper mainly studies the influence of electric vehicle charging on the power loss,voltage loss and the minimum load factor of power grid.According to the US Department of Transportation survey of household vehicles,this article learns about the daily travel law of electric vehicles and the probability distribution of electric vehicle day mileage.According to the time distribution of electric car end the trip to home every day and statistics data about the electric car charging time and mileage,the paper obtains the electric vehicle charging time and its probability distribution.Taking the full charging time of 8 hours,electric vehicle mileage 200km as an example,the paper studies the intelligent and orderly charging control strategy.In the paper,the charging power is divided into 8 parts according to the time required for charging,respectively,1 to 8 hours.For the probability of charging power for a time required for charging of 1 to 3 hours is much greater than the probability that the charging time required for charging is 4-8 hours,the paper proposes different orderly charging control strategies for these two parts of charging power,and constructs an orderly charge objective function that reflect the impact on the grid when charging.The orderly control of the charging power for a charging time of 1 to 3 hours is a combination of problems,using genetic algorithm to achieve the charging power and time control,structures chromosome according to charging requires different time and division parts,and selects the chromosomes according to the size of the fitness,finally determines the optimal charging time and charging power control scheme.Taking the IEEE 33 node distribution System as an example,the paper simulates the intelligent and ordered charging control strategy.The total charge power is divided into four partitions,the partition as a whole to control the charge.Firstly,the paper studies the effects of intelligent ordered charging on grid loss,voltage loss and minimum load factor,and compared with the way of disordered charging,and then studied the comprehensive impact of the three parameters that characterize the operating status of the grid,and compared with the impact of the grid when considering only one parameter.