Basic Study on Cooperative Management Scheme of Electric Vehicle Charging for Reduction of Impact on Low-Voltage Distribution System

Electric vehicles (EVs) are being introduced all over the world. Under the large-scale EV penetration, the charging behavior of EVs may cause various problems in distribution systems. In particular, when most of the EV owners charge simultaneously during the night while at home, voltage deviation and overloading of pole transformers may be crucial problems. In this paper, a cooperative EV charging management scheme is proposed for alleviating these problems on low-voltage distribution systems by sharing information on the charging status in the neighborhood via home energy management systems (HEMSs). The effectiveness of the proposed scheme is evaluated based on the power flow simulation using a distribution system model reflecting the regional characteristics of a real-world residential area and EV charging profiles reflecting the usage characteristics of realworld EV owners.