引用本文:唐昆明,杨伟,张太勤,等.基于Stehfest算法的配网单相接地故障双端测距方法[J].电力系统保护与控制,2015,43(14):76-83.
TANG Kunming,YANG Wei,ZHANG Taiqin,et al.A new two-terminal fault location method for distribution network based on Stehfest algorithm[J].Power System Protection and Control,2015,43(14):76-83
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基于Stehfest算法的配网单相接地故障双端测距方法
唐昆明1, 杨伟1, 张太勤2, 唐辰旭3, 龙泓吉1
1.输配电装备及系统安全与新技术国家重点实验室(重庆大学)，重庆 400044;2.重庆新世杰电气 有限公司，重庆400030;3.国网四川省电力公司德阳供电公司，四川 德阳 618000
摘要:
提出了一种基于Stehfest算法的双端测距方法。该方法采用配网单相接地故障后半周期内的零序电压、电流暂态信息，由Prony算法得到其时域表达式，利用零序网络以及线路分布参数的象函数模型，在不考虑线路零序参数的频率特性和考虑其频率特性两种情况下，分别列写出线路的象函数测距方程。通过Stehfest算法对测距方程进行数值反演计算，并用搜索法求取区间内测距方程的最小值，得到方程的数值计算矩阵，进而以该矩阵行元素平方和最小为目标，确定故障距离。大量的EMTP-ATP仿真实验验证了该方法的正确性。
关键词:  配电网  单相接地故障  零序网络  象函数模型  频率特性  Stehfest算法
DOI：10.7667/j.issn.1674-3415.2015.14.012
分类号:
基金项目:
A new two-terminal fault location method for distribution network based on Stehfest algorithm
TANG Kunming1, YANG Wei1, ZHANG Taiqin2, TANG Chenxu3, LONG Hongji1
1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;2.Chongqing Xinshijie Electric Power Corporation, Chongqing 400030, China;3.Deyang Power Supply Company, State Grid Sichuan Electric Power Co., Deyang 618000, China
Abstract:
This paper proposes a new two-terminal fault location method based on Stehfest algorithm. The method uses zero-sequence transient information within first half-cycle after a single-phase ground fault occurred in the distribution network, adopts Prony algorithm to obtain time domain expression of zero-sequence transient information, combines with zero sequence network and image function of distributed parameter line, takes frequency characteristics of lines’ zero sequence parameters into account and gets the image function location equation by using the fault feature. Then Stehfest algorithm is adopted to get location equation’s numerical inversion and search algorithm is used to find the minimum value of function location equation and obtain the numerical matrix. Last, the method calculates square sums of matrix row elements and takes the minimum value as the target to determine the fault distance. The accuracy and effectiveness of the method has been verified by EMTP-ATP simulation experiments.
Key words:  distribution network  single phase grounded fault  zero sequence network  image function model  frequency characteristics  Stehfest algorithm
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