Abstract
This thesis presents the development of a battery powered switched-reluctance motor (SRM) drive for electric vehicles (EVs) having driving, charging and discharging functions. Two three-phase intelligent power modules (IPMs) are used to form the SRM asymmetric bridge converter and the two-quadrant front-end DC/DC converter. Through proper control arrangement, good winding current and speed dynamic responses in driving mode are preserved. In addition, the commutation advanced shift and the voltage boosting by front-end converter are applied to enhance the driving performance under higher speed. In idle condition, the developed motor drive can be operated in charging mode, an on-board buck switching-mode rectifier (SMR) based charger is constructed using the constituted components of the motor drive. Only the insertion of power cord is needed to charge the battery from the mains. The simple robust control scheme is developed to yield good charging performance with satisfactory line drawn power quality. Finally in discharging mode, a single-phase three-wire (1P3W) inverter is arranged using the embedded motor drive system components. The 60Hz 220/110V AC emergency sources are generated from the vehicle battery. The developed inverter consists of an H-bridge 4-switch converter and a capacitor center-leg. Its DC-link voltage is established from the battery via the front-end boost DC-DC converter. In addition, the battery or the voltage boosted DC-link in the developed SRM drive can also be interfaced to the DC microgrid for providing the energy storage support. All the control algorithms of the developed power stages are realized using a single digital signal processor (DSP). Some simulated and experimental results are provided to evaluate their operating characteristics.