基于小波变换和数学形态学的双回线故障测距  

Fault location based on wavelet transform and mathematical morphology for double-circuit transmission lines

作　　者：顾艳[1] 王玉忠[1] 

机构地区：[1]南京工程学院电力工程学院,江苏南京211167

出　　处：《电力自动化设备》2011年第12期34-38,共5页Electric Power Automation Equipment

基　　金：南京工程学院科研基金资助项目(QKJB2009017)~~

摘　　要：针对同杆并架双回线相间、线间都存在互感的情况,将三相双回线视为一回六相线路,并且利用线路两端故障发生时的电流行波和相模变换,提出基于小波变换和数学形态学的模域双端故障测距算法。该算法利用小波变换和数学形态学对信号进行综合去噪,有效滤除信号中存在的白噪声和脉冲噪声,降低噪声对故障测距精度的影响。此外,通过六相相模变换,采用单一模量反映所有故障类型,并利用形态梯度学提取行波波头,易于实现,计算简单。对所提出的方法进行时域仿真,结果表明,该测距算法对于同杆并架双回线的故障定位很准确,且不受双回线线间耦合、线路长度、故障位置、故障类型、接地电阻、运行方式及负荷电流等的影响。Since there are inter-phase and inter-line mutual inductances among the parallel double-circuit transmission lines,a dual-end fault location method based on wavelet transform and mathematical morphology is presented,which takes the double three-phase lines as single six-phase lines and applies the current traveling waves at both ends of faulty line and the phase mode transformation. The white noise and impulsive noise in signal are effectively filtered by the wavelet transform and mathematical morphology to improve the accuracy of fault location. It carries out six phase mode transformations,adopts single mode to reflect all fault types and applies mathematical morphology gradient algorithm to extract the traveling wave front,being simple and easy to implement. It is simulated in time domain and the results show that the fault location is accurately detected, immune to the inter-line coupling, line length, fault mode and load current of Darallel double-circuit transmission position ,fault lines. type, grounding resistance, operating

关 键 词：故障测距 小波变换 数学形态学 相模变换 双回线 白噪声 

分 类 号：TM715[电气工程—电力系统及自动化]