Asymmetric bridge arm of static synchronous compensator based on modular multilevel converter and its control strategy

被引：0

作者：

Qin, Haihong ^{[1
]}

Zhao, Haiwei ^{[1
]}

Ma, Ceyu ^{[1
]}

Dong, Yaowen ^{[1
]}

Nie, Xin ^{[1
]}

机构：

[1] College of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing,210016, China

来源：

Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2016年 / 31卷 / 14期

关键词：

Power converters - Natural frequencies - HVDC power transmission - Topology - Electric current regulators;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The modular multilevel converter (MMC) is a suitable topology for high-voltage high-capacity voltage source converter (VSC). The MMC topology has been used in some static synchronous compensator (STATCOM) projects. Under asymmetric bridge-arm parameters, the fundamental-frequency AC currents distribute unequally between the upper and lower arms. Meanwhile, the DC and double-frequency components also flow into the AC side. In the paper, the equivalent models of the AC side and DC side of a three-phase MMC-STATCOM are established under asymmetric bridge-arm parameters. Based on the equivalent sub-circuits at different frequencies, the effects of asymmetric conditions on MMC-STATCOM operation are analyzed in detail. A novel control strategy is further proposed to suppress the common-current of fundamental-frequency and double-frequency while keeping the voltage balance between the upper and lower arms. Both simulation and experimental results validate the feasibility of the proposed method. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

引用

页码：183 / 192