中文摘要
過去的十年間，電能的處理技術已經有了長遠的進步；本論文主要的研究動機亦是隨著該領域之發展，唯著重在高性能三相交直流轉換器之研究。所謂高性能是指希望得到（1）在交流側沒有諧波污染的正弦線電流（2）在直流側能達到純淨直流輸出電壓（3）輸出電壓可連續調升或調降（4）具雙向負載潮流的功能（5）整合之單級轉換器架構俾獲得較高效率。

本論文主要貢獻總結如下：首先，作者提出一具有雙向負載潮流能力之主動式三相可升降壓轉換器以得到先前定義之高性能特性。其次，作者基於廣義零電壓空間向量概念及分配式D0控制策略推導出解析式責任週期控制法則並且成功地證明初期所推測之常數D0控制策略之可行性。再者，以所得解析式責任週期控制法則及狀態空間平均技巧為基礎推導出此轉換器之數學模型。其中直流模式及小訊號模式不僅能以數學方程式表示同時亦提供等效電路形式表示法，此外針對小訊號模式作者更同時推導出其轉移函數以為參考。另外，由於D0的選擇存在一個自由度，作者遂進一步提出一最大常數D0控制器，使得實際應用上能得到較低的中間電容電壓；針對此控制器，作者亦實體製作出一類比式雛形電路以證明所提控制策略之可行性。最後，為進一步減少主動式開關的切換次數以及開關閉合╱開啟所引起的暫態，作者更進一步發表了死區(dead-band)控制器。此控制器可進一步使得每一個橋式開關組的開關切換次數降低了六分之一並且中間電容電壓亦可進一步降低，達到更完美的地步。

ABSTRACT
The electrical energy processing technology has gained great progress in the past decade. The main motivation of this research is centered round the study of a high performance three-phase AC/DC converter. The so called high performance means it is desired to achieve (1) sinusoidal line currents without harmonic pollution, (2) clean DC output voltage, (3) the output voltage can be either stepped up or stepped down continuously, (4) bidirectional power flow capability, (5) integrated single stage converter configuration to achieve better efficiency.

Major contributions of this dissertation may be summarized as follows. First, the author proposed an active three-phase step up/down AC/DC converter with bidirectional power flow capability to achieve the previously defined high performance characteristic. Second, based on the generalized zero voltage space vectors concept and the distributed D0 control strategy, the author derived a closed form duty cycle control law and successfully proved the feasibility of the conjecture of constant D0 control strategy. Third, based on the closed form duty cycle control law and the state space averaging technique, the author derived the model of the proposed converter. The DC model and the small signal model may be expressed by both the mathematical equations and the equivalent circuit forms. The transfer functions of the small signal model are also derived for reference. Fourth, due to existence of one degree of freedom, namely choice of D0, of the proposed converter, the author proposed a maximum constant D0 controller for the concerned converter to lower the intermediate capacitor voltage for practical applications. An analog type prototype was also constructed to demonstrate the validity of the proposed theory. Finally, in order to further reduce the switching number of the active switches as well as reduce the switching on/off transient, the author proposed a dead-band controller. It is found that the switching number of each active switch in the bridge is reduced by one sixth and also the intermediate capacitor voltage can be further reduced.

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