The Impact Of EV Charging On Grid Load Curve And Ordered Charging Benefits Analysis

The environmental and energy concerns is increasing in recent years, every country attaches great importance to the development of the EV industry and put forward a series of corresponding development strategies. With the large scale popularity of electric vehicles, the impact of electric vehicles charging on grid load is gaining more and more attention. This paper studies the impact of electric vehicles large scale charging on the grid load curve and electric vehicle charging orderly benefits analysis. The main work is summarized as follows:First of all, Monte Carlo simulates conventional charging load characteristic on residential area based on car driving laws. According to statistical analysis at weekdays and weekends of different quarters respectively, average charging power curve of per unit about time-controlled charging load on residential area, conventional charging load and DC fast charging load on public areas are obtained based on load data acquisition from demonstration project "The EV Project".This paper studied the impact of EV scale on charging load, established curve grid load calculation model containing different types of electric vehicle charging characteristic, Analyzed and compared the impact of unordered charging based on user behavior, ordered charging Using TOU control, ideal valley of charging and composite charging on the grid load curve of the Beijing on winter and summer under different scale. Then, Considering the popularity of electric vehicle charging infrastructure in the future, we study the effect of different permeability on the Beijing grid load based on electricity proportional’ change in public areas and residential area, electricity proportional’ change about conventional and fast charging on public areas, analyze and compare results of the three programs.The equivalent energy function method in power system probabilistic simulation modeling is applied to calculate electric vehicles’ ordered charging benefits. Considering two power supply reliability index on loss of load probability and expected energy not supplied, the indicators about system capacity utilization and the difference between the amounts of coal burning are compared under three scenarios on unordered charging, ordered charging, ideal valley charging. The calculation example shows that by controlling the electric vehicles charging can not only save energy, but also improve system’s reliability and capacity utilization.