Backup Protection Scheme for Flexible DC Transmission Lines by Measuring Wave Impedance Euclidean Distance

被引：0
|
作者：
Zhang D. [1 ]
Wu C. [1 ]
He J. [1 ]
Liang C. [1 ]
Li M. [1 ]
机构：
[1] School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 10期
基金：
国家重点研发计划;
关键词：
Euclidean distance; Flexible DC transmission; Measuring wave impedance; Traveling wave pilot protection;
D O I：
10.13335/j.1000-3673.pst.2020.1809
中图分类号：
学科分类号：
摘要：
The traveling wave main protection is susceptible to the high-resistance faults, the current differential protection to the distributed capacitance, and there is a large time gap between the existing main and backup protection schemes. In order to solve the above problems and further improve the reliability of the protections, this paper proposes a new scheme of traveling wave longitudinal protection based on measuring the wave impedance Euclidean distance. By analyzing the difference between the amplitude and change trend of the measured wave impedance on both sides of the line during the internal and external faults of the flexible DC transmission lines, it is proposed to use dyadic wavelet transform to extract the wideband window to measure the wave impedance, and introduce the Euclidean distance and the similarity coefficient to express the amplitude and change trend of the wave impedance. Finally, the internal and external faults are distinguished according to the Euclidean distance and the similarity coefficient. The PSCAD simulation verifies that the protection principle can identify the internal and external faults reliably, sensitively and quickly, and it has a strong ability to withstand the transition resistance and noise interference. © 2021, Power System Technology Press. All right reserved.
引用
收藏
页码：3895 / 3905
页数：10
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