An enhanced MMC topology With DC fault clearance capability

被引：0

作者：

Li, Xiaoqian ^{[1
]}

Liu, Wenhua ^{[1
]}

Song, Qiang ^{[1
]}

Rao, Hong ^{[2
]}

Zhu, Zhe ^{[2
]}

Li, Xiaolin ^{[2
]}

机构：

[1] State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Dept. of Electrical Engineering, Tsinghua University, Haidian District, Beijing

[2] Electric Power Research Institute of China Southern Power Grid, Yuexiu District, Guangzhou

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2014年 / 34卷 / 36期

关键词：

Dc fault; Fault clearance; Modular multilevel converter (MMC); Non-permanent fault; System recovery;

D O I：

10.13334/j.0258-8013.pcsee.2014.36.003

中图分类号：

学科分类号：

摘要：

High-voltage direct current system using modular multilevel converter (MMC-HVDC) is a potential candidate for the grid integration of renewable energy over-long distances. The dc-link fault is an issue which MMC- HVDC must deal with. This paper proposed an enhanced MMC topology with dc fault clearance capability. Adopting diode clamp double sub-modules, the freewheeling effect of diodes is eliminated by the sub-module capacitor voltages, and fault-current path is cut off and thus fault currents can be extinguished rapidly. Since the tripping of ac circuit breakers is avoided, MMC can immediately restart power transmission for non-permanent faults. The required rated voltage of additional semiconductors is half the conventional semiconductors, resulting in low extra cost. The number of sub-modules required to achieve the same dc-link rated voltage is halved, leading to simplification and cost reduction of pulse generator. Simulation results using PSCAD/EMTDC have verified the validity of the proposed topology and protection scheme. ©2014 Chin. Soc. for Elec. Eng.

引用

页码：6389 / 6397

页数：8

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