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Voltage Balancing and Fluctuation-Suppression Methods of Floating Capacitors in a New Modular Multilevel Converter

【摘要】 Modular multilevel converter (MMC) is a newly emerging multilevel topology for high-voltage applications during recent years. In this paper, a new MMC is proposed, and the structure and operating principle are analyzed. Owing to the cascaded basic cells without multiwinding transformer, the voltage balancing of floating capacitors must be considered. However, the voltage fluctuation also exists, and theoretical analysis indicates that the amplitude is inversely proportional to the fundamental frequency. This paper has proposed a voltage-fluctuation-suppression method which can reduce the amplitude of the voltage fluctuation in low-frequency region. It can also be used in motor driving with pump/blowerlike load at low frequency and improve the start-up performance significantly. A low-power three-phase five-level prototype is designed and built up to demonstrate the validity of this method.

【期刊名称】 Industrial Electronics, IEEE Transactions on

【作者】 Wang, K.; Li, Y.; Zheng, Z.; Xu, L.;

【作者单位】 State key laboratory of power system, Department of Electrical Engineering, Tsinghua University , Beijing, China;

【收录信息】;

【年(卷),期】2013(60),5

【年度】2013

【页码】p.1943-1954

【总页数】12

【原文格式】PDF

【正文语种】eng

【中图分类】;

【关键词】Bridge circuits; Capacitors; Fluctuations; Pulse width modulation; Switches; Topology; Voltage fluctuations; Floating capacitor; modular multilevel converter (MMC); voltage balancing; voltage-fluctuation suppression;

【原文服务方】国家工程技术数字图书馆

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