Traveling Wave Protection Scheme of Voltage Polarity Comparison Formula for Multi-terminal DC Power Network

被引：0
|
作者：
Zheng T. [1 ]
Song X. [1 ]
机构：
[1] State Key Laboratory of New Energy Power System (North China Electric Power University), Changping District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2022年 / 46卷 / 12期
基金：
中国国家自然科学基金;
关键词：
current-limited reactor; multi-terminal DC power grid; polarity comparison; traveling wave protection; voltage traveling wave;
D O I：
10.13335/j.1000-3673.pst.2022.0708
中图分类号：
学科分类号：
摘要：
Compared with the configuration at the both terminals of the DC lines, installing the current-limited reactors at the port of the converter station in the multi-terminal DC power grid (MTDC) can reduce the economic investment on the premise of restraining the short-circuited current. Aiming at such problem that the conventional DC line protections based on boundary effects are no longer applicable under the similar conditions, the complex refraction and reflection phenomena of the traveling waves under the faults of the MTDC are analyzed in this paper. And when the internal and external faults occur, the expressions of the first two voltage traveling waves measured at the relay locations of each line are deduced. The polarity characteristics of the voltage traveling waves at both ends of the line are revealed in case of the internal and external faults. On this basis, a traveling wave protection scheme based on the voltage polarity comparison is proposed. Without necessarily considering the influence of the threshold setting and the sampling asynchrony, this scheme is able to reliably identify the internal and external faults. Finally, the effectiveness of the protection scheme is verified through the PSCAD / EMTDC simulation platform. © 2022 Power System Technology Press. All rights reserved.
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页码：4690 / 4698
页数：8
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