Integrated Power Converter with G2V, V2G and Direct V2V Capabilities for SRM Drive Based Electric Vehicle Application

Abstract

The article presents the design and implementation of an integrated power converter (IPC) for a switched reluctance motor (SRM) drive based electric vehicle (EV) application. The IPC proposed integrates driving and battery energy storage (BES) charging/discharging functionality. During BES charging mode, i.e., grid-to-vehicle (G2V) charging, the proposed IPC is reutilized as a bridgeless boost power factor correction circuit (PFCC) in cascade with a bidirectional DC-DC converter (BDDC). Similarly, during BES discharging mode, i.e., vehicle-to-grid (V2G) charging, the proposed IPC is reutilized as a BDDC in cascade with a single-phase voltage source inverter. Thus, with the proposed IPC, the BES can be charged/discharged at AC grid voltage. The proposed IPC also supports DC fast/vehicle-to-vehicle (V2V) charging wherein the host EV via the integrated BDDC can charge/discharge a receiver EV of higher or lower BES voltage rating than the host EV. In addition, during G2V, V2G and V2V charging, the charging current flowing in phase winding/s when reconfigured as charging inductor/s results in a zero-torque production. Detailed theoretical analysis and experimental verification on a prototype 4-phase SRM are presented to evaluate the proposed IPC's driving and BES charging features.