EV charging and its applications in active distribution systems

With the development and popularization of electric vehicle (EV), impacts of large-scale of EV charging to the power system have emerged, especially to the distribution systems. In the framework of smart grid, wide integration of renewable energy and distributed generators has posed new challenges to construction and operation of power system. How to integrate EVs into active distribution systems has become a problem which needs more focus and attention. In this paper, firstly, load model of single EV charging is derived and harmonic currents are presented upon actual measurement data. Based on operation data of an EV charging station, effect of EV charging on the total load curve is analyzed secondly. Considering human behavior, the features of EV charging compared with conventional loads are summarized. In the end, combining features of EV charging and active distribution systems, applications of EVs in active distribution systems are explored. It can be expected that integration of EVs will play an important role in active distribution systems in improving the shock resisting ability of power system, increasing operation efficiency and renewable energy penetration, as well as reducing construction cost.