摘要
为实现配电网快速准确故障定位,避免故障范围扩大,结合单-双端行波原理,提出一种配电网多端行波故障定位方法。利用小波变换模极大值确定故障初始行波波头,用4次多项式拟合零模波速与零、线模时差的关系用于故障测距;利用双端行波原理进行故障选线及主干线和有二级分支出线的一级分支的故障测距;利用基于零、线模波速差的单端测距法对二级分支以及没有二级分支出线的一级分支进行测距;只需要判断初始行波波头,受分支影响小。通过PSCAD仿真验证了该方法的可行性。
In order to realize fast and exact fault locations of distribution network and avoid the expansion of fault range,a multi-terminal traveling wave fault location method is proposed by combining single-and double-end traveling wave distance measurement principle.The maximum modulus of wavelet transform is used to determine the initial traveling wave head of fault,and quartic polynomial is used to fit the relationship of zero-mode component versus the time difference between zero-and aerial-mode components of traveling wave for fault distance measurement.Double-end traveling wave distance measurement principle is used for fault line selection and the fault distance measurement of main and primary branches(with secondary branch),while single-end principle based on the velocity difference between zero-and aerial-mode components is used to conduct distance measurement for the secondary branch and the primary branch(without secondary branch).Only the initial traveling wave head is needed to be determined,thus the influence of branches is smaller.The feasibility of the proposed method is verified by PSCAD simulations.
作者
杨晓丽
舒勤
YANG Xiaoli;SHU Qin(School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2018年第4期91-96,共6页
Proceedings of the CSU-EPSA
基金
四川省科技支撑计划资助项目(2014GZ0010
2014GZ0083)
关键词
配电网
零模波速
故障选线
故障定位
小波变换
distribution network
zero-mode wave velocity
fault line selection
fault location
wavelet transform
