基于五次谐波和混沌系统的谐振接地系统故障选线  

Fault line selection of resonant grounding system based on fifth harmonic and chaotic system

作　　者：薛太林 靳贰伟 吴杰 Xue Tailin;Jin Erwei;Wu Jie(Department of Electrical Engineering,Shanxi University,Taiyuan 030000,China)

机构地区：[1]山西大学电力工程系,太原030000

出　　处：《电测与仪表》2022年第1期176-182,共7页Electrical Measurement & Instrumentation

摘　　要：单相接地故障在中性点经消弧线圈接地系统中发生的概率最大,并且接地点的电气故障特征较弱,选线难度大。不同线路的对地电容电流突变量的5次谐波分量的幅值和相位特征差异明显,通过分析比较非故障线路和故障线路之间的这些差异,提出基于电容电流突变量的5次谐波分量和Duffing振子检测原理相结合的选线方法,将每条线路各相的电容电流突变量作为外驱动力加入到Duffing振子系统中,观察本线路各相的相轨迹状态变化的一致性,便可选出故障线路,Matlab仿真结果表明该算法有较高的准确性。The single-phase grounding fault has the highest probability of occurrence in the grounding system of the arc suppression coil at the neutral point,and the electrical fault characteristics of the grounding point are weak,so the line selection is difficult.The amplitude and phase characteristics of the 5^(th) harmonic component of the capacitance current mutation of different lines are obviously different.By analyzing and comparing these differences between the non-faulty line and the faulty line,the line selection method combing the 5 th harmonic component based on the mutation of the capacitance current and Duffing oscillator detection principle is proposed in this paper.The capacitance current mutation of each phase and each line is added as an external driving force to the Duffing oscillator subsystem,and the consistency of the phase trajectory state changes of each phase of the line is observed.The fault line can be selected,and the Matlab simulation results show that the algorithm has higher accuracy.

关 键 词：消弧线圈 电容电流突变量 5次谐波分量 Duffing振子系统 相轨迹 

分 类 号：TM71[电气工程—电力系统及自动化]