摘要
中性点经高阻接地系统发生单相接地故障时,受接地电阻、故障位置及故障时刻相位角等因素的影响较大。当上述极端情况出现时,故障线路的稳态零序电流幅值变得很小,难以对其进行检测和分析计算。利用Duffing振子系统对与系统内驱动力同频的外界微弱正弦信号高度敏感的特性,提出基于稳态零序电流和Duffing振子检测原理相结合的选线方法,将各线路稳态零序电流作为外驱动力加入到Duffing振子系统中,通过比较各线路的相轨迹状态一致情况选出故障线路。MATLAB仿真结果表明,算法有较高的抗干扰性。
Single-phase grounding faults at the neutral point on account of the high-resistance grounding system occur mostly due to such factors as grounding resistance,fault location and the phase angle at the time of the fault.When the above-mentioned extreme conditions occur,the amplitude of the steady-state zero sequence current of the faulty line becomes so small that its detection,extraction,analysis and calculation become difficult.Taking advantage of the fact that the Duffing oscillator system was highly sensitive to the external weak sinusoidal signal with the same frequency as the internal driving force of the system,a line selection method based on the combination of steady-state zero-sequence current and Duffing oscillator detection principle was proposed.The steady-state zero-sequence currents of all lines,as external driving force,were added to the Duffing oscillator system,and the faulty line was selected by comparing conformity between phase trajectory states of the lines.MATLAB simulation results showed that the presented algorithm was highly resistant to interference.
作者
靳贰伟
Jin Erwei(Shanxi University,Taiyuan Shanxi 030000,China)
出处
《电气自动化》
2020年第4期24-27,共4页
Electrical Automation
关键词
高阻接地
单相接地故障
零序电流
Duffing振子系统
相轨迹
high resistance grounding
single-phase grounding fault
zero sequence current
Duffing oscillator system
phase trajectory
