山东电力技术2026，Vol.53Issue(4)：41-54,14.DOI:10.20097/j.cnki.issn1007-9904.250409
基于虚拟电容动态极性判据与FIR滤波器的谐振接地系统高阻故障定位方法
Resonant Grounding System High Impedance Fault Location Method Based on Virtual Capacitance Dynamic Polarity Criterion and FIR Filter
摘要
Abstract
To address the challenge of locating high-impedance fault in resonant grounding systems,which are susceptible to unbalanced components and measurement noise interference,a fault location method based on virtual capacitance dynamic polarity criteria and Finite Impulse Response(FIR)filters is proposed.Through a theoretical analysis of high-impedance fault transient mechanisms,the method reveals a transient process dominated by zero-sequence network parallel resonance.It establishes dual polarity-amplitude criteria for virtual capacitance at upstream/downstream fault points,utilizing their sign differences for preliminary fault section screening.By combining differential filters with sliding accumulation filters,the method extracts fault components of zero-sequence voltage and current,respectively,suppressing power-frequency imbalance and high-frequency noise.The dynamic polarity criterion enhances signal robustness through feature fusion.A recursive location algorithm with an adaptive threshold elimination mechanism is further designed to achieve precise positioning under complex operating conditions.Simulation results demonstrate that the proposed method achieves accurate location across various transition resistances,fault inception angles,and strong noise environments,while maintaining complete robustness against unbalanced components.关键词
谐振接地系统/高阻故障/零序故障特征/虚拟电容动态极性/故障定位Key words
resonant grounding system/high impedance fault/zero-sequence fault characteristics/virtual capacitance dynamic polarity/fault location分类
信息技术与安全科学引用本文复制引用
张明,陆忞,张鑫,赵晨昕..基于虚拟电容动态极性判据与FIR滤波器的谐振接地系统高阻故障定位方法[J].山东电力技术,2026,53(4):41-54,14.基金项目
国网江苏省电力有限公司重点科技项目(J2024064). Key Science and Technology Project of State Grid Jiangsu Electric Power Company(J2024064) （J2024064）
