The major purposes of this thesis lie in the development and digital control of inverter systems with galvanic isolation and three-phase front-end switch-mode rectifier (SMR). First, the single-phase inverters with low-frequency output transformer isolation and DC-link high-frequency transformer isolation are established and comparatively evaluated their performance. The latter is achieved by employing a DC/DC isolated full-bridge converter to establish DC-link voltage for its followed inverter. A simple load resonant soft switching scheme is designed to yield zero-voltage switching. In control aspect, the robust waveform control method is developed to let the established inverters possess good transient and static waveform tracking characteristics under linear and nonlinear loads. For the isolated DC-link DC/DC converter, well-regulated DC-link voltage is also preserved via proper dynamic control.
Switch-mode rectifier (SMR), or called power factor corrected (PFC) rectifier, has been increasingly employed as a front-end converter of power equipment to provide well-regulated and/or boostable DC voltage with satisfactory line drawn power quality. In the developed inverter systems, a three-phase single-switch (3P1SW) SMR is employed, which is operated under discontinuous current mode to possess reasonably good power quality without current control loop. The proper circuit and control designs are also performed to yield good DC output and AC input control characteristics.
As generally recognized, a three-phase inverter can be constructed using single power module consisting of six power switches, or formed via proper modulation connections using multiple single-phase inverters. One purpose of this thesis is to perform the comparative study for these two types of three-phase inverters. Specifically speaking, a single module three-phase inverter is established, and a delta-connected three-phase inverter is formed using the developed single-phase inverters. For the latter, it can become V-connected inverter automatically as one module is faulted. The three-phase power is continuously provided subject to the reduction of apparent power rating.
In recent years, miniaturization of power equipment has been an attractive affair. This can be promoted via power stage integration and common digital control environment for multiple power stages. In this thesis, the constituted power stages in the developed inverters are digitally controlled in a common digital signal processor (DSP). Only some necessary signal conditioner circuits are externally added to solve the capability limits possessed by the employed DSP. With proper control scheme design and practical digital considerations, the developed inverter systems possess good operating characteristics in many aspects, which are demonstrated experimentally.

本論文旨在研製具切換式整流器前級及電氣隔離之變頻器系統並從事其數位控制。首先，建立具低頻輸出隔離變壓器與高頻變壓器隔離直流鏈之單相變頻器，並比較評估其操控性能。後者以具高頻隔離變壓器之全橋式直流/直流轉換器提供變頻器之直流鏈電壓。為達到零電壓軟式切換，本文採用負載串聯諧振軟式切換。於控制方面，藉由強健波形控制法則，達到在線性與非線性負載下皆能具有良好穩態及動態之瞬間波形追控，對於隔離型全橋式直流/直流轉換器，亦提供適當之控制器設計，以使其具有良好調節特性。
切換式整流器亦稱功因校正整流器，因可提供具良好調控之直流鏈電壓及交流輸入電力品質，已日漸廣泛地被用為電力設備之前端轉換器。三相單開關切換式整流器在不連續導通模式下，因具有良好之電力品質而不需電流迴授控制。因此，本文採用此型切換式整流器，藉由妥善之電路及控制器設計，以獲得良好之直流輸出電壓及交流入電電力品質控制特性。
眾所皆知地，三相變頻器可用具有六開關之單一功率模組建構，或由多個單相變頻器組接形成。本論文另一目的在於建構並比較評估此兩種組態三相變頻器之效能，更具體而言，本文將建立單一模組化三相變頻器，以及由單相變頻器組接成 接之三相變頻器。後者在有一模組故障時，可自動地變成V接三相變頻器，在降低額定下持續提供三相電源。
近年來，電力電子設備之小型化已極其吸引人關注，此可藉由多級電力電路之整合與共同數位控制環境促成。在所建構之系統中，將由同一數位信號處理器從事變頻器系統中多功率級之數位化控制，只需外加少數類比電路元件，解決所採數位信號處理器之能力限制，由適當之控制機構設計及一些控制實務考量，可得良好變頻器系統操控性能。所建構變頻器系統之性能將以一些實測結果驗證。

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