Protection of Nonpermanent Faults on DC Overhead Lines in MMC-Based HVDC Systems

被引：388

作者：

Li, Xiaoqian ^{[1
]}

Song, Qiang ^{[1
]}

Liu, Wenhua ^{[1
]}

Rao, Hong ^{[2
]}

Xu, Shukai ^{[2
]}

Li, Licheng ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China

[2] Source Grid China, Elect Power Res Inst, Guangzhou 510080, Guangdong, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2013年 / 28卷 / 01期

关键词：

DC fault; fault clearance; modular multilevel converter (MMC); nonpermanent fault; system recovery; MULTILEVEL; MODULATION;

D O I：

10.1109/TPWRD.2012.2226249

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];

摘要：

A high-voltage direct current system using modular multilevel converter (MMC-HVDC) is a potential candidate for grid integration of renewable energy over long distances. The dc-link fault is an issue MMC-HVDC must deal with, especially for the nonpermanent faults when using overhead lines. This paper proposed a protection scheme to implement fast fault clearance and automatic recovery for nonpermanent faults on dc lines. By employing double thyristor switches, the freewheeling effect of diodes is eliminated and the dc-link fault current is allowed to freely decay to zero. Then, the dc arc can be naturally extinguished and the insulation on the short-circuit point can be restored. The thyristor switches convert the dc-link fault into an ac short circuit of the ac grid through MMC arms. The ac short-circuit current can be cleared simply by turning off all thyristor switches. Since circuit breakers are not tripped during fault clearance, MMC can immediately and automatically rebuild the dc-link voltage and restart power transmission. Simulation results using PSCAD/EMTDC have verified the validity of the proposed protection scheme.

引用

页码：483 / 490

页数：8

共 21 条

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