电工技术学报  2019, Vol. 34 Issue (13): 2806-2819    DOI: 10.19595/j.cnki.1000-6753.tces.L80491
电力系统 |
柔性直流配电网高阻接地故障检测方法
王晓卫1, 2, 高杰3, 吴磊2, 宋国兵2, 韦延方1
1.河南理工大学电气工程与自动化学院焦作 454000;
2. 西安交通大学电气工程学院西安710049;
3.浙江省电力有限公司温州供电公司温州325000
A High Impedance Fault Detection Method for Flexible DC Distribution Network
Wang Xiaowei1, 2, Gao Jie3, Wu Lei2, Song Guobing2, Wei Yanfang1
1. School of Electrical Engineering and Automation Henan Polytechnic UniversityJiaozuo 454000 China;
2. School of Electrical Engineering Xi’anJiaotong University Xi’an 710049 China;;
3. Wenzhou Power Supply Company Zhejiang Electric Power Company Wenzhou 325000 China
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摘要 新能源电源、直流负荷等的大量出现,极大地促进了柔性直流配电网的发展,但作为柔性直流配电网的单极高阻接地故障(HIF)检测问题,一直以来并未得到重点关注。针对这一实际工程问题,提出一种基于改进互补集合经验模态分解算法(CEEMDAN)的HIF检测方法。首先,对暂态零模电流(TZMC)采用CEEMDAN算法提取出特征模态IMF1分量,进而对IMF1进行一阶差分运算,获得突变奇异点,通过在奇异点附近计算累积斜率和,与启动阈值进行比较,区分故障状态与正常状态;然后,采用Prony算法对IMF1分量进行参数辨识,获得IMF1分量中的特征频率分量(CFC)与DC分量,再计算CFC与DC的能量比,通过能量比数值的不同取值进一步区分小阻抗接地故障(SIF)、中阻接地故障(MIF)、高阻接地故障(HIF)、负荷投切(LS)状态。大量实验表明,该检测方法准确有效,与现有其他方法相比,在特征提取准确率、检测精度、计算速度等方面具有优势。
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王晓卫
高杰
吴磊
宋国兵
韦延方
关键词 故障检测直流配电网本征模态函数暂态零模电流特征频率分量    
Abstract:Flexible DC distribution network has acquired more interest and development in recent years, with the emergency of lots of renewable energy and direct current (DC) loads, as for the high impedance fault (HIF) detection in flexible DC distribution network, it not gathers attention from the industry and research community. Hence, this paper proposed an improved complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) method. Firstly, it utilizes CEEMDAN to extract the first intrinsic mode function component (IMF1) of transient zero mode current (TZMC), and obtainedthe mutation singular point by calculating one order differences among IMF1, then, it distinguishes fault stage from normal condition (NC) to calculate the slopes near the singular point, and compare slopes with start threshold. Secondly, uses Prony algorithm to identify the IMF1 parameters, which including characteristic frequency component (CFC) and DC component, besides, calculates the energy ratio between CFC and DC to distinguish small impedance fault (SIF), medium impedance fault (MIF), high impedance fault (HIF) and load switching (LS). Lots of simulation experiments and field data prove that the paper can detect HIF effectively, and has some advantages compared with other methods in feature extraction, detection accuracy and calculation speed and so on.
Key wordsFault detection    DC distribution    intrinsic mode function    transient zero mode current    characteristic frequency component   
收稿日期: 2018-07-01      出版日期: 2019-07-17
PACS: TM77  
基金资助:基金:国家自然科学基金(61403127,61703144)和河南省科技攻关项目(182102210051)资助
通讯作者: 王晓卫,男,1983年生,博士研究生,讲师,研究方向为配电网故障选线与定位、高阻故障检测、电力工程信号处理。E-mail:proceedings@126.com   
作者简介: 高 杰,男,1993年生,硕士,工程师,研究方向为配电网继电保护。E-mail:iamgaojie1993@163.com
引用本文:   
王晓卫, 高杰, 吴磊, 宋国兵, 韦延方. 柔性直流配电网高阻接地故障检测方法[J]. 电工技术学报, 2019, 34(13): 2806-2819. Wang Xiaowei, Gao Jie, Wu Lei, Song Guobing, Wei Yanfang. A High Impedance Fault Detection Method for Flexible DC Distribution Network. Transactions of China Electrotechnical Society, 2019, 34(13): 2806-2819.
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