一種改進的二極管鉗位型多電平變換器拓撲

摘要： 多電平電路在高壓大功率領域的拓展受到其復雜電路拓撲的制約，因此近年來不斷有新型多電平電路結構被提出。本文在傳統多電平逆變器拓撲結構的基礎上，提出了一種新型單相七電平電壓源逆變器拓撲。新型電路拓撲是在傳統的單相全橋五電平鉗位二極管電路基礎上，增加了兩個開關器件，利用10個開關器件以及4個鉗位二極管產生了7種不同的電平輸出。詳細分析了該逆變器的拓撲結構，給出了PWM控制策略。最后通過仿真實驗驗證了這種拓撲的可行性。該逆變器對傳統鉗位二極管逆變器在結構上做出了優化。 敘詞：變換器 多電平 拓撲結構 鉗位二極管 電力電子 Abstract：The spread of multilevel converters in high-voltage and large-capacity fields is restrained due to complicated topologies, therefore this paper proposes a new multilevel converter topology on the base of the traditional multilevel converters topology. In this topology two power switches were used together with a full-bridge converter with clamping diodes. By using ten power switches and four diodes seven output voltage levels can be obtained. The composition of the topology and the PWM control method were described. At last the simulate results is provided, which proves the feasibility of the topology. The proposed converter optimizes the conventional converter with clamping diodes structure. Keyword：Converters, Multilevel, Topology, Clamping-diodes, Power electronics