中国电机工程学报2025，Vol.45Issue(11)：4256-4268,13.DOI:10.13334/j.0258-8013.pcsee.232383
暂态量保护中基于暂态波形特征拟合的高压线路合闸于故障快速辨识判据
Fast Identification Criterion of Switching Into Fault on the HV Transmission Line Based on Fitting Transient Waveform Feature in Transient-based Protection
摘要
Abstract
Whether the circuit breaker is closed on a normal or faulty line,the reclosing operation always causes traveling waves.How to reliably distinguish whether there is a fault on the line is a problem that must be solved when applying transient-based protection.However,the existing switching into fault criteria are easily affected by the fault conditions and reclosing modes,and their speeds need to be improved.Given the above problems,this paper first studies the differences in the attenuated direct current,steady-state power frequency,and natural frequency components in the reclosing current between the faulty and normal lines.It is found that the initial reclosing current on a faulty line changes sinusoidally at nearly 50 Hz,but when reclosing on a normal line,it rapidly oscillates with a natural frequency,which is much higher than 50 Hz.Then,the dominant frequency of the current transient waveform is extracted by the least square fitting method.The protection threshold and the data window are strictly set,forming a fast switching into fault criterion based on fitting transient waveform feature.Finally,based on the PSCAD simulation,the validity of the proposed protection criterion is verified.The protection performance is not affected by the fault conditions and reclosing modes,and the time window is only 5 ms.关键词
暂态量保护/合闸于故障/固有频率/最小二乘拟合/合闸电流波形Key words
transient-based protection/switch into fault/natural frequency/least square fitting/reclosing current waveform分类
动力与电气工程引用本文复制引用
吴宇奇,王楷杰,黄梓欣,李正天,林湘宁..暂态量保护中基于暂态波形特征拟合的高压线路合闸于故障快速辨识判据[J].中国电机工程学报,2025,45(11):4256-4268,13.基金项目
国家重点研发计划项目(2021YFB2401000) （2021YFB2401000）
国家电网有限公司科技项目(SGSDDK00WJJS2200105).National Key R&D Program of China(2021YFB2401000) （SGSDDK00WJJS2200105）
Science and Technology Project of State Grid Corporation of China(SGSDDK00WJJS2200105). （SGSDDK00WJJS2200105）
