A 4800-V grid-connected electric vehicle charging station that provides STACOM-APF functions with a bi-directional, multi-level, cascaded converter

This paper presents a new design for an ultra-fast, public electric vehicle (EV) charging station. Because of the multi-megawatt nature of such a station, the design is aimed at being appropriate for a medium voltage (MV) connection. Through the proper choice of a multi-level topology and staircase modulation, it is able to operate efficiently and provide galvanic isolation without the use of a large transformer. As a further benefit for this application, it is able to provide reactive, harmonic, and unbalanced load compensation. Simulation results are provided in Simulink to verify the effectiveness of the staircase modulation and capabilities of the topology.