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基于波形相似度分析的直流输电线路故障测距
李斌, 张纪航, 刘海金, 李晔
天津大学 智能电网教育部重点实验室,天津 300072
摘要:
为了克服行波测距原理耐受过渡电阻能力较弱以及所需采样率过高的缺陷,提出了一种基于波形相似度分析的直流输电线路故障测距方法。基于正向、反向差电流与故障点电流的函数关系,利用Pearson相关系数分析2种差电流波形相似性并提取故障位置的相关信息。所提方法利用线路两端电压、电流的时域信息,受过渡电阻影响较小,具备较强的抗噪声能力,可靠性高。经过PSCAD/EMTDC仿真验证,所提方法能够实现线路全长的准确故障定位。
关键词:  高压直流输电  输电线路  故障测距  差电流  波形相似度  时移
DOI:10.16081/j.epae.201909001
分类号:TM77;TM721.1
基金项目:国家自然科学基金资助项目(51677126)
Fault location of HVDC transmission lines based on waveform similarity analysis
LI Bin, ZHANG Jihang, LIU Haijin, LI Ye
Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Abstract:
In order to overcome the shortcomings of the traveling wave fault location principle that performs worse in high-resistance fault and requires extremely high sampling frequency, a fault location method based on waveform similarity for HVDC(High Voltage Direct Current) power transmission lines is proposed. Based on the functional relationship between positive and negative differential currents and fault point current, the waveform similarity between positive and negative differential currents is analyzed by using Pearson correlation coefficient and the corresponding information of fault location is extracted. The proposed method takes use of time-domain information of voltages and currents at both ends, is less affected by the transition resistance and noise, and shows high reliability. PSCAD/EMTDC simulation verifies that the proposed method can achieve accurate fault location of the full length of power transmission line.
Key words:  HVDC power transmission  transmission line  electric fault location  differential current  waveform similarity  time shift

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