本論文提出一基於空間向量調變功率因數修正之高昇壓三相交直流轉換器，此電路架構包含一Cockcroft-Walton (CW)倍壓電路、一個三相轉單相之矩陣式轉換器，其中矩陣式轉換器係由三個昇壓電感器及六個雙向電力開關所組成。本文提出之轉換器將三相的電源轉換成單相的交流電源至 CW 倍壓電路，並利用空間向量調變之技術使轉換器達到功率因數修正之目的，使輸入線電流具有低電流失真、單位功率因數，以及高的電壓增益，且提供一可調交替頻率之電流注入 CW 倍壓電路來降低輸出電壓漣波，相較於傳統單相 CW 倍壓電路，可獲得較佳的效率。本文將介紹此轉換器之電路操作原理、空間向量原理及控制策略，透過 MATLAB/Simulink 模擬軟體，建立一模擬的架構以驗證本文提出架構及方法之可行性，並以此模擬驗證為基礎，使其架構未來可於實體電路中實現。

This thesis proposes a three-phase to single-phase ac-dc high step-up converter with power factor correction (PFC) based on space vector modulation for high voltage dc applications. The proposed converter includes a Cockcroft-Walton voltage multiplier (CWVM) and a three-phase to single-phase boost-type matrix converter, which is formed by three boost inductors and six bidirectional switches. The proposed converter which changes a single-phase ac source to the CWVM by three-phase ac source application. By using space vector pulse width modulation (SVPWM) to achieve the goal of power factor correction, the proposed converter not only achieves almost sinusoidal input currents with low distortion and unity power factor but also obtains high voltage gain at the output terminal. Moreover, the matrix converter reduces the dc output voltage ripple in CWVM according to adjustable frequency current. The performance of the proposed converter is superior to the conventional a single-phase CWVM, the operation principle, SVPWM principle and control strategy of the proposed converter are detailed in this thesis. Finally,simulated results demonstrate the claims and validity of the proposed converter, and experimental work will be achieved in the future.

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