In order to promote the switching from ICE vehicles to more environment friendly EVs, a network of fast charging stations is necessary. A lot of research is being conducted in this area in order to design efficient models of chargers along with developing new technologies to mitigate the current problems encountered such as the charging time, incapability to charge multiple vehicles at a time etc. This paper presents the different ways of classifying EV battery charging technologies and also a topological survey of different charging stations proposed in the literature. A three-phase bidirectional charger and a modular fast charger proposed in the literature are also presented along with their modelling, control strategies and simulation results to analyse their respective performances.

Keywords : bidirectional topology, fast charging, Vehicle to Grid (V2G), grid support, charging station topology, modularity.