本論文旨在研製以數位信號處理器為主具切換式整流器前級電氣隔離之單相與三相變頻器系統，藉由適當控制獲得良好之變頻器輸出性能及優良入電電力品質。在變頻器系統之開發中，提出下列組態之設計、建構與控制：(i)單相低頻與高頻隔離式變頻器；(ii)三相單模組低頻與高頻隔離式變頻器；(iii)三相低頻隔離式Y與Δ/V模組組接變頻器。所建構變頻器系統之主要特性有：(i)採用強健電流及電壓波形控制，使在變動與非線性負載下仍具有良好及穩健之變頻器輸出效能；(ii)應用直流/直流串聯共振式轉換器提供高頻隔離；(iii)Δ-接模組變頻器中任一單相變頻器模組故障時，可自動轉成V-接模組於降載下繼續供電。
眾所皆知地，切換式整流器可從事交流至直流電能轉換，同時具良好之交流入電電力品質，而在較大額定時通常採三相切換式整流器。本論文建構一個三相單開關及一個維也納切換式整流器，以為所建變頻器系統之前級，並從事其比較性能評定。三相單開關切換式整流器工作於不連續導通模式而不需電流控制，具有最簡易之電路組態及控制架構，但所得之電力品質特性較差。而維也納切換式整流器使用三個功率開關，並操作於連續導通模式，具有比三相單開關切換式整流器優良之電力調控能力及電力品質。

關鍵詞：單相變頻器、三相變頻器、模組組接、諧振轉換器、隔離式直流鏈、數位控制、數位信號處理器、波形控制、變壓器激磁不平衡、切換式整流器、功因校正。

This thesis develops some DSP-based isolated single- and three-phase inverters with switch-mode rectifier (SMR) front-end. The adequate control is conducted to yield good inverter output performance and satisfactory line drawn power quality. In the development of inverter systems, the designs, implementations and controls for the following plants are performed: (i) single-phase low-frequency (LF) and high-frequency (HF) isolated inverters; (ii) three-phase single-module LF and HF isolated inverters; (iii) three-phase LF isolated Y and Δ/V modular connected inverters. Some major features of these developed inverters lie in: (i) the robust current and voltage waveform controls are proposed to yield good and robust inverter output performance under changing and nonlinear loads; (ii) the HF isolation is achieved by an isolated intermediate DC/DC series resonant converter; (iii) the Δ-connected inverter can become V-connected one automatically as one constituted module is faulted.
As generally recognized, SMR is an indispensable power electronic equipment for AC to DC conversion with good power quality, and the three-phase one is a natural choice for higher power rating. This thesis develops a three-phase single-switch (3P1SW) and a three-phase Vienna SMR front-ends for the established inverters, and their comparative performance evaluation is made. The 3P1SW SMR operating in discontinuous conduction mode (DCM) is simpler in circuit and control scheme, but it suffers from having limited power quality characteristics. As to the Vienna SMR, it employs three power switches and operates under continuous conduction mode (CCM). Hence it possesses much better power conditioning control capability and power quality than those of 3P1SW SMR.

Key words: Single-phase inverter, three-phase inverter, modular connection, resonant converter, isolated DC-link, digital control, DSP, waveform control, transformer flux imbalance, switch-mode rectifier, power factor correction.

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