Analysis of the Influence of Electric Vehicle Access on the Power Flow and Voltage of Distribution Network

Abstract

Due to the load characteristics of electric vehicles (EVs), a large number of charging and replacing power stations connecting to the power grid will have certain influence on the power grid. Therefore, it is necessary to study the impact of EV access on the distribution network power flow and voltage. This paper analyzes the charging and discharging behavior characteristics of electric private cars and the influence factors of vehicle charging load, and proposes a charging method modeling method for EVs considering different charging and discharging behaviors. This method can simulate the charging behavior habits of EV users. According to the data of private car travel in a city in 2018, taking the IEEE33 node system as an example, the distribution network model of EV access was established by using MATLAB software. This paper analyzes the influence of EV access on the distribution network under two charging modes, including transformer load, line current and node voltage, which provides references for the development planning of EV and the coping strategy of the power grid.