本文旨在研製具高功率因數之三相交-直流功率轉換器。藉由適當地控制開關之切換，可使輸入側達到高功因與低電流諧波。在控制策略方面，文中採用單週期直流電壓閉迴路控制及直流電壓與交流電流閉迴路控制，以穩定直流輸出電壓、有效改善電流諧波並達到高功因。由於單週期的控制方式不需要產生單位正弦訊號作為電流參考波形，故可降低控制的複雜度、簡化閉迴路調節器的設計且易於實現。另者，在直流電壓與交流電流控制迴路中，因加入了交流電流閉迴路，因此使整個系統較諸單週期直流電壓的控制更加穩定。
本文採用32位元數位信號處理器(DSP, TMS320F28069)為系統之控制核心，且回授電壓及電流，以軟體完成閉迴路控制，故可減少電路元件，提高系統可靠度。實測結果顯示在1kW電阻性負載下，三相二階層轉換器透過直流電壓與交流電流閉迴路的控制策略，其功因、交流側電流總諧波失真率及效率分別而為0.97、6.24%及84% ;而三相三階層昇壓型轉換器在直流電壓與交流電流閉迴路控制之對應實測值則為0.98、5.45%及87%，均優於三相二階層轉換器。模擬與實驗結果印證本文系統控制策略之可行性。

This thesis aims to develop high power factor three-phase ac-dc power converters. Properly controlling the power switching can achieve high power factor and low current harmonics on the input side. Two control strategies are proposed, namely, one cycle dc voltage as well as dc voltage and ac current closed-loop controls. By using the one cycle control, there is no need to generate unit reference sine wave for current. It can simplify the design of the closed-loop controller and result in easy implementation of the system. The difference between the above two control strategies is that the latter has an additional ac current closed-loop, causing the system control more stable.
In this thesis, the 32 bit digital signal processor,“TMS320F28069”, is used as the core of the controller. The required closed-loop controls are mainly accomplished by voltage and current feedbacks as well as software program for the reduction of circuit components and enhancement of system reliability. The experimental results indicate that, under 1kW resistive load, the power factor, total harmonic distortion of current and efficiency are 0.97, 6.24% and 84%, respectively, for three-phase two-level boost converter with dc voltage and ac current closed-loop control. Whereas, for three-phase three-level ac-dc power converter adopting dc voltage and ac current closed-loop control yields the better corresponding measured values of 0.98, 5.45% and 87%. Both simulation and experimental results verify the feasibility of the proposed control strategy.

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