Abstract
This thesis presents the establishment of a switched-reluctance motor (SRM) drive for electric vehicles (EVs) incorporating with grid to vehicle (G2V) and vehicle to grid (V2G) operation capabilities. The developed SRM drive consists of a two-quadrant front-end DC/DC converter and an asymmetric bridge converter, which are formed using two three-phase power modules. Well driving characteristics are obtained via proper current and speed controls. The commutation advanced shift as well as voltage boosting approaches are further applied to enhance the driving performance under high speed. In addition, the regenerative braking is also achieved by properly setting the commutation of SRM converter and the switching of front-end converter. In idle condition, a bilateral single-phase three-wire (1P3W) inverter with the same front-end stage is constructed using the embedded motor drive power devices. The 48V battery voltage is boosted by the front-end converter to established a well-regulated 400V DC-link. Then the 60Hz 220V/110V AC voltage outputs are generated from the followed inverter. Good inverter output waveforms are yielded by applying differential mode (DM) and common mode (CM) control approaches. In autonomous energy management operation, the 1P3W inverter can power the loads to perform vehicle-to-home (V2H) operation. In addition to autonomous mode, the inverter can be arranged to perform G2V and V2G operations. The developed bidirectional inverter system possesses flexible bidirectional power flow capability between vehicle battery and 1P3W utility grid. Hence, power conditioning control operation can be arranged to perform the EV battery charging from mains with power factor correction, and conversely, the programmed power transfer from battery to utility grid. Moreover, it can also be achievable to let all the load reactive and harmonic powers be compensated by the battery powered inverter in grid-connected operation cases. All the controls of the developed system are realized fully digitally. And some simulated and experimental results are provided to verify its operating performance.