Abstract
This thesis develops an electric vehicle (EV) interior permanent magnet synchronous motor (IPMSM) drive powered by battery/supercapacitor (SC) with grid-connected and energy harvesting functions. Both the battery and the SC are respectively interfaced to the motor drive DC-link via its own bidirectional buck-boost converter. And the interleaved converter is adopted for the battery to possess redundant capability. The DC-link voltage can be varied below or above the battery voltage in wide speed range. The SC can quickly discharge energy to assist the motor rapid acceleration and store the recovered regenerative braking energy and transfer to the battery. Both standard and position sensorless controls for the EV IPMSM drive are conducted and comparatively evaluated. The high-frequency injection (HFI) sensorless control approach with changed injection frequencies is proposed to reduce the inherent back-EMF harmonic effects. Through proper control, good driving performances are preserved, including acceleration/deceleration, reversible and regenerative braking operations. In idle condition, the developed EV motor drive can be arranged to possess grid-to- vehicle (G2V), vehicle-to-grid (V2G) and vehicle-to-home (V2H) operations using the embedded motor drive components. In G2V operation, an on-board switch-mode rectifier (SMR) based charger is formed to perform battery charging with good line drawn power quality. As to the V2H/V2G operations, the 220V/110V 60Hz AC output voltages with good waveform quality are generated from the developed single-phase three-wire (1P3W) inverter to power home appliances. The preset power can also be sent back to the utility grid. As to the established energy harvesting system, the roof mounted PV can directly charge the battery in any conditions. In idle case, the accessible DC source or single-phase AC source can charge the battery via the constructed boost SMR.