一種改進(jìn)的二極管鉗位型多電平變換器拓?fù)?/h1>

作者：侯李祥  呂躍剛  　上傳時(shí)間：2009/7/20 17:50:35

摘要： 多電平電路在高壓大功率領(lǐng)域的拓展受到其復(fù)雜電路拓?fù)涞闹萍s，因此近年來不斷有新型多電平電路結(jié)構(gòu)被提出。本文在傳統(tǒng)多電平逆變器拓?fù)浣Y(jié)構(gòu)的基礎(chǔ)上，提出了一種新型單相七電平電壓源逆變器拓?fù)洹Ｐ滦碗娐吠負(fù)涫窃趥鹘y(tǒng)的單相全橋五電平鉗位二極管電路基礎(chǔ)上，增加了兩個(gè)開關(guān)器件，利用10個(gè)開關(guān)器件以及4個(gè)鉗位二極管產(chǎn)生了7種不同的電平輸出。詳細(xì)分析了該逆變器的拓?fù)浣Y(jié)構(gòu)，給出了PWM控制策略。最后通過仿真實(shí)驗(yàn)驗(yàn)證了這種拓?fù)涞目尚行浴Ｔ撃孀兤鲗�傳統(tǒng)鉗位二極管逆變器在結(jié)構(gòu)上做出了優(yōu)化。 敘詞：變換器 多電平 拓?fù)浣Y(jié)構(gòu) 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