一种基于耦合电感的模块化多电平变流器控制

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Abstract This paper introduces a novel structure of modular multilevel converter(MMC) with a coupled(center-tapped) inductor, and describes its operating performance. Since the upper and lower bridge arms are strictly symmetric, the fundamental currents are anti-phase, then it results that the voltages on inductors are largely reduced with using the coupled inductor, which also effectively suppress the circulating current. An improved method of sorting voltages of capacitors not only is conducive to the balance of charging and discharging of capacitors, but also can stabilize the DC current. At last Matlab/Simulink simulation results of a MMC with 10 sub-modules in each phase, show the advantages of using the coupled inductor and the validity of the improved sorting method.

Key words： Modular multilevel coupled inductors pulse width modulation method DC link currents

Received: 25 October 2013 Published: 10 April 2015

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TM46

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	Yuan Yisheng
	Zhu Benyu

Cite this article:

Yuan Yisheng,Zhu Benyu. Control Strategy of a Modular Multilevel Converter Based on Coupled Inductor[J]. Transactions of China Electrotechnical Society, 2015, 30(6): 216-224.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I6/216

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