Precise control law of MMC and its application in reducing capacitor voltage ripple by injecting circulating current

2015 18th International Conference on Electrical Machines and Systems (ICEMS) Pub Date : 2015-10-01 DOI:10.1109/ICEMS.2015.7385061

Kai Li, Chen Li, F. Lee, Mingkai Mu, Zhengming Zhao

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引用次数: 11

Abstract

Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the proposed method. It is proved that in terms of eliminating the circulating current, the effect of this control law is approximately equivalent to the conventional closed loop control with circulating current suppressing controller (CCSC). Based on this control law, the operation of MMC is further analyzed and the modulation index limitation is offered when the circulating current is eliminated. Furthermore, this paper deals with reducing the capacitor voltage ripple. After comparison, the paper gives an optimized form for single-phase MMC when only second-order circulating current is injected. The analysis can be extended to three-phase MMC. Theoretical analysis and simulations verify all the conclusions.

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MMC精确控制规律及其在注入循环电流减小电容器电压纹波中的应用

模块化多电平变换器(MMC)是近十年来高压大功率应用领域的研究热点。本文首先对其基本工作原理进行了深入分析。推导出精确的控制律，直接精确地控制输出电压和循环电流。与传统的控制律不同，该方法考虑了臂电感电压。结果表明，在消除循环电流方面，该控制律的效果近似等同于带循环抑制控制器(CCSC)的传统闭环控制。在此控制规律的基础上，进一步分析了MMC的运行情况，并给出了消除循环电流时调制指数的限制。此外，本文还讨论了如何减小电容电压纹波。经过比较，给出了只注入二阶循环电流时单相MMC的优化形式。该分析可扩展到三相MMC。理论分析和仿真验证了所有结论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 18th International Conference on Electrical Machines and Systems (ICEMS)

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