A highly integrated converter topology in SRM drive system with battery charge and V2G function

This paper presents a highly integrated converter topology in plug-in electric vehicle (PEV) switched reluctance motor (SRM) drive system, which can also achieve battery charging function and vehicle-to-grid (V2G) function. This integrated converter can implement three operation modes. In the driving mode, the SRM works as a normal four-phase motor, every phase is connected an asymmetrical half-bridge structure. In the charging mode, the SRM phase windings are used as large inductance, among two phases are directly connected to the grid. So, the two phases asymmetrical half-bridge are rebuilt a bridgeless power factor correction (PFC) converter to satisfy the power quality requirement. Another phase asymmetrical half-bridge is constructed to be a buck-boost convertor to realize battery charging. In the V2G mode, the two phases asymmetrical half-bridge and a large capacitance are used as a voltage source type inverter(VSTI), which can feedback the capacitance power to the grid. The other phase can run as a boost converter to boost up the dc-link voltage from battery. This highly integrated technology will play an important role in miniaturization and efficiency of electric vehicles.