Identification Strategy for Arc Extinction Time of Single-pole Grounding Fault in True Bipolar Flexible DC System

被引：0
|
作者：
Ning J. [1 ]
He J. [1 ]
Li M. [1 ]
Liang C. [1 ]
Luo Y. [1 ]
Chen K. [1 ]
机构：
[1] School of Electrical Engineering, Beijing Jiaotong University, Beijing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2022年 / 46卷 / 13期
基金：
中国国家自然科学基金;
关键词：
arc extinction time; arc model; fault pole voltage; flexible DC transmission; single-pole grounding fault;
D O I：
10.7500/AEPS20210809006
中图分类号：
学科分类号：
摘要：
Adaptive reclosing should not only have the ability to distinguish fault types but also further optimize the reclosing time after the transient fault, which requires the identification of fault arc extinction time. Firstly, by analyzing the dynamic characteristics of grounding fault arc, the nonlinear characteristics of fault arc and adaptive simulation of arc extinction time are realized. Secondly, the transient and steady state characteristics of fault pole voltage of true bipolar flexible DC line before and after arc extinction are analyzed. It is revealed that the changing trend of fault pole voltage before arc extinction mainly depends on the zero input response component, showing an attenuation trend, while the fault pole voltage after arc extinction mainly depends on the zero state response component, showing an upward trend. Finally, an integral ratio algorithm is proposed to effectively extract the characteristic difference of fault extreme voltage before and after arc extinction. If the integral ratio is not lower than the threshold in the cycle judgment time, the fault arc extinction is judged, and the time when the threshold is exceeded for the first time is output as the detected arc extinction time. PSCAD/EMTDC simulation results verify the effectiveness and reliability of the proposed strategy. © 2022 Automation of Electric Power Systems Press. All rights reserved.
引用
收藏
页码：121 / 129
页数：8
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