中国电力2025，Vol.58Issue(8)：12-22,30,12.DOI:10.11930/j.issn.1004-9649.202408060
基于电流积分量相关性的直流配电线路单极高阻接地保护
Single-Pole High-Resistance Grounding Protection for DC Distribution Lines Based on Current Integral Quantity Correlation
摘要
Abstract
When a single-pole high-resistance grounding fault occurs in a DC distribution system,the transient current amplitude is small and the fault characteristics are weak,making it hard for the existing protection methods to provide reliable protection for the DC system.Therefore,a single-pole grounding protection method is proposed for the DC distribution lines based on current integral quantity correlation.According to the transient current characteristics of the high-resistance grounding faults,distinct polarity difference features of fault currents are identified between internal and external faults.The current integral sequence is calculated to highlight the overall change situation of the current.Pearson correlation analysis is employed to quantify the current correlation degree between the line terminals.Based on the correlation level,a fault detection criterion is constructed to achieve protection against single-pole grounding faults in DC distribution lines.Based on PSCAD/EMTDC simulation platform,the simulation results show that the proposed method can provide accurate fault protection under relatively weak fault features,with high protection sensitivity and reliability.关键词
电流变异特性/直流配电系统/分布电容/电流差动保护Key words
current variation characteristics/DC distribution network/distributed capacitance/current differential protection引用本文复制引用
吉兴全,毛会总,叶平峰,刘志强,张祥星,黄心月,倪亚超..基于电流积分量相关性的直流配电线路单极高阻接地保护[J].中国电力,2025,58(8):12-22,30,12.基金项目
山东省自然科学基金面上资助项目(ZR2022ME219) （ZR2022ME219）
中国博士后面上资助项目(2023M734092). This work is supported by Natural Science Foundation of Shandong Province(No.ZR2022ME219),China Postdoctoral Science Foundation(No.2023M734092). （2023M734092）
