Research on the Control Method for MMC With Low Arm Current Peak

被引：0

作者：

Shi X. ^{[1
]}

Yang R. ^{[1
]}

Fang Z. ^{[1
]}

Cai X. ^{[1
]}

Liu L. ^{[1
]}

Rao F. ^{[1
]}

机构：

[1] Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Minhang District, Shanghai

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 13期

基金：

中国国家自然科学基金;

关键词：

arm current; capacitor voltage ripple; circulating current injection control (CCIC); current stress; modular multilevel converter (MMC); power loss;

D O I：

10.13334/j.0258-8013.pcsee.220554

中图分类号：

学科分类号：

摘要：

In the conventional circulating current control strategy of the MMC, the circulating current is usually suppressed to zero to reduce system loss. However, circulating current injection also provides benefits. This paper explores methods to reduce the arm current peak of the MMC based on second-order and fourth-order circulating current injection. Two circulating current injection schemes are proposed: one can minimize the arm current peak but increases the sub-module capacitance. The other compromises decreasing the arm current peak with increasing the capacitor voltage ripple. A decoupled circulating current control strategy is designed to achieve accurate control of the two circulating currents. Furthermore, the two schemes are analyzed and compared in terms of current stress, power handling capability, and converter losses. The recommended solution for different applications is then provided. Simulation and hardware-in-loop experiment results of the proposed technique show that the arm current peak of the MMC with high power factor can be reduced by about 25%, facilitating short-term overload operation. ©2023 Chin.Soc.for Elec.Eng.

引用

页码：5177 / 5191

页数：14

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