Circulating Current Suppression for MMC-HVDC Systems with Asymmetric Arm Impedance

被引：13

作者：

Deng, Fujin ^{[1
,2
]}

Heng, Qian ^{[1
]}

Liu, Chengkai ^{[1
]}

Lyu, Yongqing ^{[1
]}

Wang, Qingsong ^{[1
]}

Liu, Dan ^{[3
]}

Zhu, Rongwu ^{[4
]}

机构：

[1] Southeast Univ, Sch Elect Engn, Nanjing 210096, Peoples R China

[2] Jiangsu Key Lab Smart Grid Technol & Equipment, Nanjing 210096, Peoples R China

[3] State Grid Jiangsu Elect Power CO LTD, Res Inst, Nanjing 211106, Peoples R China

[4] Christian Albrechts Univ Kiel, Dept Power Elect, D-24142 Kiel, Germany

来源：

CSEE JOURNAL OF POWER AND ENERGY SYSTEMS | 2021年 / 7卷 / 03期

关键词：

Circulating current suppressing; control strategy; high-voltage direct-current; modular multilevel converter; MODULAR MULTILEVEL CONVERTERS; OPERATION;

D O I：

10.17775/CSEEJPES.2019.02690

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The modular multilevel converter (MMC) has been a highly promising topology in the high-voltage direct-current (HVDC) transmission area, where each arm of the MMC may consist of hundreds of series-connected submodules and an inductor. Due to its parameter inaccuracy, component aging, and so on, the component parameter in different arms of the MMC may be different, which may cause circulating current in the MMC-HVDC transmission system, and result in current deterioration, power losses, and electromagnetic interference, etc. In this paper, the circulating current suppressing (CCS) in the MMC-HVDC system, due to asymmetric arm impedance, is analyzed. Based on the mathematical analysis, a method of using an auxiliary circuit is proposed for the MMC to realize the CCS and improve the performance of the MMC-HVDC system. Simulation studies are conducted with PSCAD/EMTDC in the HVDC system, which confirms the feasibility of the proposed method.

引用

页码：530 / 540

页数：11

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