電動車係環保、零排放交通工具，將逐漸取代傳統內燃引擎車。在電動車之驅動，感應馬達仍為最常用者之一。為建立有關驅動技術，本論文開發以電池/超電容混合供電之電動車感應馬達驅動系統，並開發一隔離式雙向直流快速充電器，具快速良好充電特性及良好入電電力品質。
首先建構固定直流鏈電壓之電動車感應馬達驅動系統，做為研究平台。以所提間接磁場導向機構，強化馬達之解耦及轉矩產生特性。用以產生滑差轉速命令之轉子參數，由所提估測方式較準確得之。同時，透過適當之額定激磁電流設定，電流及速度控制器設計，獲得在額定轉速內之優良加減速及運轉特性。超過額定轉速，應用傳統之(1/wr)法進行弱磁控制，亦具良好之操控性能。
為於廣速度範圍具較佳效率，接著建構具可調壓直流鏈之電池/超電容供電驅動系統。超電容之加入，可強化馬達之加減速能力及延長電池壽命。電池及超電容個別經雙向介面轉換器接至變頻器直流鏈，展現個邊彈性。依據馬達轉速適當設定直流鏈電壓，使車輛有較高效率及較低之電池耗能。由所提濾波電流分離法，可降低電池之快速及短暫充/放電操作。
開發一隔離式直流快速充電器，提升車輛充電速度，同時車輛可充當虛擬電廠，施行車輛對電網之操作。電力電路具雙向操作能力，係由雙向三相變頻器及三相CLLC諧振轉換器組成。於電網對車輛充電模式，變頻器成為切換式整流器，具功率因數矯正功能。適當設計之CLLC諧振轉換器，具寬範圍電壓轉換比，以實現對車載電池之定電流充電。此外，零電壓切換特性，使其在高頻切換下具高轉換效率。

Electric vehicle (EV) is environmentally friendly and zero-emission transportation option that will be gradually employed to replace the internal combustion engine vehicles. In EV traction, induction motor (IM) is still one of the most commonly used motors. To establish the related the technologies, this thesis develops a battery/supercapacitor (SC) powered EV IM drive. In addition, a bidirectional isolated fast charger is developed. The fast and good charging characteristics with good line power quality are achieved.
The EV IM drive with fixed DC-link voltage is first established as the experimental platform. The improved indirect field-oriented (IFO) scheme is developed to enhance decoupling and developed torque characteristics. The rotor parameters used to set the slip angular speed command are more accurately obtained by the proposed estimation approach. Additionally, by properly setting the rated flux current and designing the current controller and speed controller, excellent acceleration and deceleration capabilities within the rated speed range are achieved. Over rated speed, the simple (1/wr) field-weakening method is applied to preserve satisfactory driving performance.
To improve the motor drive efficiencies over wide speed range, the battery/SC hybrid source powered IM drive with varied DC-link voltage is then developed. The motor acceleration and deceleration capabilities and the battery life extension can be achieved by adding the SC. Both battery and SC are respectively interfaced to the DC-link via individual bidirectional boost-buck converter with proper control. By properly setting the DC-link voltage based on the motor speed, the vehicle can achieve higher efficiency and lower battery consumed energy. By incorporating SC and utilizing the proposed filtering current separation method, the rapid and short charge/discharge operations of the battery can be reduced.
Finally, an isolated DC fast charger is developed. It not only enhances the battery charging speed but also can serve as a virtual power plant to perform the vehicle-to-grid discharging operation. To enable bidirectional operation, the power circuit structure consists of a bidirectional three-phase inverter and an isolated three-phase CLLC resonant converter. The inverter is operated as switching-mode rectifier in grid-to-vehicle (G2V) charging operation. The CLLC resonant converter achieves wide range of voltage conversion ratios to enable constant current charging of vehicle battery. Furthermore, due to the zero-voltage switching (ZVS) characteristics, it exhibits excellent conversion efficiency during high-frequency switching.

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