Strategy and application of reducing capacitor voltage ripples in modular multilevel converters

被引：0

作者：

Li J. ^{[1
]}

Jin X. ^{[1
]}

Wu X. ^{[1
]}

Zhang J. ^{[1
]}

Wu W. ^{[2
]}

机构：

[1] National Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Haidian District, Beijing

[2] Collaborative Innovation Center of Electric Vehicles in Beijing, Haidian District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2016年 / 36卷 / 07期

关键词：

Capacitor voltage ripples; Instantaneous current value; Modular multilevel converter (MMC); Modulation algorithm;

D O I：

10.13334/j.0258-8013.pcsee.2016.07.016

中图分类号：

学科分类号：

摘要：

System cost and operation life can be improved by reducing the capacitors ripples in modular multilevel converters (MMC). The reason of traditional circulating current suppression strategy to reduce the capacitor fluctuation was analyzed by numeric calculation. The instantaneous power fluctuations of submodules were expressed as capacitor voltages fluctuations. According to the relationship between the voltage fluctuations and the circulating currents, the optical circulating current to reduce the power fluctuations was calculated. Ripple suppression effects were analyzed by changing modulation ratio and power factor angle. Finally, the ripple suppression strategy was verified by utilizing Matlab simulation and RT-Lab hardware-in-the-loop platform. The effects by power factor angle were tested by simulations. The feasibility and application of carrier phase shifting modulation and nearest level modulation methods were discussed by simulations and experiments. © 2016 Chin. Soc. for Elec. Eng.

引用

页码：1892 / 1899

页数：7

共 21 条

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