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电子学报  2015 

自举式三相半桥级联型多电平逆变器

DOI: 10.3969/j.issn.0372-2112.2015.06.025, PP. 1205-1210

Keywords: 三相四线制,级联多电平逆变器,半桥,纹波电压,充电电流

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Abstract:

本文提出了一种新型的三相四线制多电平逆变器,它在常规六开关三相全桥逆变输出上,再级联一级半桥,并加入自举电路,负载中线与输入电源正极相连.在纹波跟踪分段式SPWM(SinusoidalPulseWidthModulation)调制下,级联的半桥电能由自举电路工作时得到.该电路拓扑结构及其控制方法,减少了多电平逆变的独立直流电源数,提高了逆变输出电压.文章用逐段计算法分析了规则采样SPWM调制法的自举电容的纹波和电流,以及产生的谐波.通过分析和实验表明,自举电容的电容量、充电回路电阻、负载和调制度等,均对自举电容的纹波和电流有影响.

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