电力系统保护与控制2026，Vol.54Issue(15)：72-82,11.DOI:10.19783/j.cnki.pspc.260178
基于三次谐波以及网孔电流法的发电机定子接地故障定位方法
A fault location technique for stator ground faults in generators based on third harmonics and mesh current method
摘要
Abstract
To accurately locate stator ground faults in synchronous generators,a fault location method based on third harmonics and the mesh current method is proposed.A third-harmonic equivalent circuit model incorporating distributed capacitance and grounding transformer impedance is established,the mathematical relationships between the third-harmonic voltages at the neutral point and generator terminals and the fault location as well as the transition resistance are derived,and the fault characteristic equations are constructed using the mesh current method.Considering the nonlinear variation of voltage phase with fault location,a fault location objective function is constructed by minimizing the deviation between the measured and calculated voltages while incorporating precise model coefficients.The particle swarm optimization algorithm is employed for global optimization and determines the fault location.The proposed model is verified by PSCAD simulations,demonstrating high accuracy.The proposed method maintains high fault location precision under various fault scenarios,different load conditions,and unbalanced operating conditions,and is applicable to different generator parameters.Without requiring additional sensors,the method achieves precise fault location across the entire winding using only conventional third-harmonic voltage measurements,providing an effective technical means for rapid diagnosis and maintenance of generator stator ground faults.关键词
同步发电机/定子接地故障/三次谐波/故障定位/网孔电流法Key words
synchronous generator/stator ground fault/third harmonic/fault location/mesh current method引用本文复制引用
王一璇,陈方圆,乔健..基于三次谐波以及网孔电流法的发电机定子接地故障定位方法[J].电力系统保护与控制,2026,54(15):72-82,11.基金项目
This work is supported by the National Natural Science Foundation of China(No.52507099). 国家自然科学基金项目资助(52507099) （No.52507099）
