Development of a bi-directional off-board level-3 quick charging station for electric bus

Quick charging of an electric bus calls for advanced research and development on quick and safe battery charging technologies with vehicle-to-grid and grid-to-vehicle integration capability. The integration of many buses with high power transfer requirement in a short span of time, would leave a huge stress on the power utility if the power quality is poor. This paper proposes an improved high-performance bi-directional off-board level-3 quick charging station based on vector control technique adopted for electrical machines, for fast and efficient charging of electric bus. The proposed off-board battery charging station can be scaled down for small electric vehicles also. This paper aims to provide a comprehensive understanding of the developed charger at the design stage prior to its implementation and prototyping stages. A detailed description on the design of the developed charger is provided and the performance of the bi-directional charger is elicited through numerical investigations.