基于可变分数延时FIR滤波器的小电流接地系统故障选线方法  

Fault Line Selection Method for Small Current Grounding System Based on Variable Fractional Delay FIR Filter

作　　者：仓义亮 CANG Yiliang(Jiangsu Guannan Vocational School,Lianyungang 223500,Jiangsu,China)

机构地区：[1]江苏省灌南中等专业学校,江苏连云港223500

出　　处：《电气传动自动化》2024年第4期59-62,34,共5页Electric Drive Automation

基　　金：第五期江苏省职业教育教学改革研究课题(ZYB266)。

摘　　要：故障选线是小电流接地系统故障维修的基础。为降低错选率,本文提出了基于可变分数延时FIR滤波器的小电流接地系统故障选线方法。利用无线传感器感知接地系统线路的零序电流信号,采用开、闭组合滤波算法对信号进行滤波处理,利用可变分数延时FIR滤波器进行信号变换、分数时延校正,提取到零序电流信号的全域幅度特征,采用余弦相似度确定系统的故障线路,以此实现基于可变分数延时FIR滤波器的小电流接地系统故障选线。实验证明,本文的故障选线方法错选率在1%以内,选线精度较高,具有一定的推广应用价值。The fault line selection is the foundation of fault maintenance for low current grounding systems.To reduce the error rate,this paper proposes a fault line selection method for small current grounding systems based on variable fractional delay FIR filters.By using wireless sensors to sense the zero sequence current signal of the grounding system line,an open close combination filtering algorithm is used to filter the signal.A variable fractional delay FIR filter is used for signal transformation and fractional delay correction to extract the global amplitude characteristics of the zero sequence current signal.The cosine similarity is used to determine the fault line of the system,thereby achieving fault line selection for small current grounding systems based on variable fractional delay FIR filters.The experimental results show that the error rate of the fault line selection method proposed in this paper is within 1%,the accuracy of the line selection is high,and which has certain promotion and application value.

关 键 词：可变分数延时FIR滤波器 小电流接地系统 零序电流 开、闭组合滤波算法 余弦相似度 

分 类 号：TM711.2[电气工程—电力系统及自动化] TP306[自动化与计算机技术—计算机系统结构]