單極性移相控制高頻脈沖交流環節逆變器研究

摘要：本文深入分析研究了高頻脈沖交流環節逆變器穩態原理特性與單極性移相控制策略。采用狀態空間平均法建立了逆變器平均模型，獲得了輸出電壓、濾波電感電流、共同導通時間、單極性SPWM波占空比等關鍵電路參數的設計準則和逆變器的外特性曲線。原理試驗結果證實了理論分析的正確性。這類逆變器具有電路拓撲簡潔、兩級功率變換（DC/HFAC/LFAC）、雙向功率流、周波變換器實現了ZVS換流、單極性SPWM波等優點，包括全橋全波式、全橋橋式兩種電路，前者適用于低壓輸出逆變場合，后者適用于高壓輸出逆變場合。 敘詞：單極性移相控制 高頻脈沖交流環節 逆變器 周波變換器 軟換流 Abstract：The steady principle of inverter with high frequency pulse AC link and uni-polarity phase shifting control strategy are deeply investigated. The inverter's average model by using the state-space averaging approach is presented, the design criterion of key circuit parameters such as output voltage, filtering inductance, common conduction time,uni-polarity SPWM waveform's duty cycle etc are given. The theoretical analysis is verified by the test results .This kind of inverter has the advantages such as simple topology ,two-stage power conversion(DC/HFAC/LFAC), bi-directional power flow, soft commutation of cycloconverter ,uni-polarity SPWM waveform etc. It has a full bridge-full wave mode topology which is suit for low output voltage and a full bridge-full bridge mode topology which is suit for high output voltage. Keyword：Uni-polarity Phase shifting Control，High frequency Pulse AC Link，Inverter，cycloconverter，soft commutation