摘要
配电网单相接地故障选线问题由来已久,现有的研究成果大多是针对单相永久性接地故障的。而在实际配电网中,不稳定电弧和间歇性电弧接地等非永久性接地故障也极易发生,且难于选线。发生非稳定电弧接地故障时会带来大量的高频分量,本文提出一种自适应陷波滤波器算法,用来提取线路谐波电流的5次谐波。该方法通过调节自身参数来自动跟踪信号的变化,从而实现了对5次谐波信号实时、准确的提取。仿真结果表明,该选线方法在发生非永久性接地故障时能正确地选出故障线路,其原理简单、可靠。
Single phase-to-ground fault-detection for distribution system has been a challenge for many years,but the research has been mainly concentrated on permanent grounding fault,which is not general.Actually,the unstable arc-grounding and intermittent arc-grounding faults,which are kind of non-permanent grounding faults,are most likely to occur in the power system.When non-permanent arc-grounding fault happens,many high frequency components will be produced correspondingly.An adaptive notch filter（ANF） algorithm is introduced in this paper to extract the fifth harmonics signal of zero-sequence current.The algorithm can track the change of signal automatically by adjusting its own parameters.Thus it can accurately extract the real-time fifth harmonics signal.Empirical results show that the proposed method can find the fault feeder correctly when non-permanent grounding fault occurs.The principle is simple and reliable.
出处
《中国电力》
CSCD
北大核心
2013年第8期108-111,117,共5页
Electric Power
基金
辽宁省科学技术基金资助项目(20092063)
