A BATTERY/SUPERCAPACITOR POWERED EV SRM DRIVE WITH BIDIRECTIONAL ISOLATED CHARGER

• Main Authors: Chou, Kuan-Yu, 周冠佑
• Other Authors: Liaw, Chang-Ming
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/c87gtd

碩士 === 國立清華大學 === 電機工程學系所 === 105 === This thesis develops a battery/super-capacitor (SC) powered electric vehicle (EV) switched-reluctance motor (SRM) drive with grid-to-vehicle (G2V), vehicle-to-home (V2H), vehicle-to-grid (V2G) and energy harvesting functions. All these auxiliary functions are conducted with the converters formed using the SRM drive embedded components and an externally added bidirectional LLC resonant isolated DC/DC converter. The EV DC-link voltage is established by the battery through a H-bridge DC/DC converter. In addition to voltage boosting, the DC-link voltage can also be lower than battery voltage under lower speeds to yield improved efficiencies. The SC is connected to the DC-link via an one-leg bidirectional buck/boost DC/DC converter for assisting the battery in acceleration and regenerative braking. In motor driving control, to yield better winding current tracking responses, the properly designed feedback controller is augmented with an observed back electromotive force (EMF), a feedforward controller and a robust current tracking error cancellation controller (RCECC). Moreover, the commutation shifting and voltage boosting approaches are further applied to reduce the effects of EMF under higher speeds and/or heavier loads. In idle condition, the developed EV drive can be conducted movable storage applications. The isolation in grid-connected operation is provided by a LLC resonant DC/DC converter established high-frequency DC-link. In G2V operation, the switch-mode rectifier based on-board chargers are formed using the EV drive embedded components. The battery can be charged from the utility grid with good line drawn power quality. Conversely in V2H/V2G operations, a three-phase three-wire (1P3W) inverter is formed to generate the 220V/110V 60Hz AC output voltages to power home appliances or send power back to the utility grid. Finally, a three-phase Vienna SMR based plug-in energy harvesting scheme (EHS) is developed. The additional auxiliary quick charging from the mains can be conducted. In addition, the possible harvested three-phase AC source, single-phase AC source and DC source can also be the inputs for charging the on-board battery.