电工技术学报  2019, Vol. 34 Issue (14): 2913-2921    DOI: 10.19595/j.cnki.1000-6753.tces.180711
电机与电器 |
光伏直流电弧电磁辐射特性分析与测量方法
王尧1,2, 张彦风1,2, 牛峰1,2,3, 赵双乐1,2,4, 李奎1,2
1. 省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学) 天津 300130;
2. 河北省电磁场与电器可靠性重点实验室(河北工业大学) 天津 300130;
3. 浙江大学电气工程学院 杭州 310027;
4. 天津科技大学电子信息与自动化学院 天津 300222
Characterization and Measurement Method of DC Arc Electromagnetic Radiation for Photovoltaic Systems
Wang Yao1,2, Zhang Yanfeng1,2, Niu Feng1,2,3, Zhao Shuangle1,2,4, Li Kui1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China;
3. College of Electrical Engineering Zhejiang University Hangzhou 310027 China ;
4. Applied Liberal and College Tianjin University of Science and TechnologyTianjin 300222 China
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摘要 直流故障电弧是威胁光伏系统安全运行的重要因素。该文研究光伏直流电弧电磁辐射信号特征及测量方法,探索电弧电磁辐射用于光伏直流电弧故障诊断与定位的可行性。直流电弧电磁辐射在时域呈现为一系列间断脉冲序列,其脉冲起始时刻与电弧电流突变时刻相对应,并且每个电磁辐射脉冲都是一个衰减的振荡信号。理论分析表明,电弧电磁辐射信号强度与电弧电流变化率近似成正比,电弧电磁辐射频谱最大值所对应频率与电弧电磁辐射脉冲宽度近似成反比。在此基础上,设计出一种用于电弧电磁辐射测量的三阶Hilbert分形天线,其有效频率范围为210~800MHz。实验结果表明,电弧电磁辐射强度与电流变化率的关系及其频谱最大值所对应频率与理论分析相吻合,验证了天线设计的正确性。此外,还分析了测量距离对电弧电磁辐射信号强度的影响,为电弧故障定位策略研究奠定了基础。
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王尧
张彦风
牛峰
赵双乐
李奎
关键词 光伏系统直流电弧电磁辐射Hilbert分形天线电弧故障    
Abstract:DC arcing fault is an important factor threatening the safe operation of photovoltaic (PV) system due to the lack of current zero crossing. In this paper, the characteristics and measurement methods of electromagnetic radiation emitted from DC arcs are studied, and the feasibility of arcing fault detection and location by using such electromagnetic radiation signals is investigated. The DC arcing electromagnetic radiation comprises a series of discontinuous impulse sequences in the time domain, the pulse start time corresponding to the sudden change of arcing current. Consequently, the electromagnetic radiation intensity is proportional to the current derivation. In addition, each single impulse appears as a damped oscillation signal, which determines the frequency spectrum of the radiation signal. Accordingly, a three-order Hilbert fractal antenna with a bandwidth of 210~800MHz is designed. It is verified that both the frequency bandwidth and the frequency at maximum point of spectrum agree with the theoretical analysis. Finally, the effects of current derivation and distance from arcing point on arcing fault detection are analyzed, which is helpful to the arcing fault detection and location.
Key wordsPhotovoltaic system    DC arc    electromagnetic radiation    Hilbert fractal antenna    arcing fault   
收稿日期: 2018-04-24      出版日期: 2019-07-29
PACS: TM501  
基金资助:国家自然科学基金(51607055)、河北省自然科学基金(E2015202143)和河北省教育厅青年科学基金(QN2014148)资助项目
通讯作者: 李奎 男,1965年生,教授,博士生导师,研究方向为智能电器、电器可靠性与检测技术。E-mail:likui@hebut.edu.cn   
作者简介: 王尧 男,1981年生,博士,副教授,研究方向为电器智能化技术与电器设备电磁兼容。E-mail:wangyao@hebut.edu.cn
引用本文:   
王尧, 张彦风, 牛峰, 赵双乐, 李奎. 光伏直流电弧电磁辐射特性分析与测量方法[J]. 电工技术学报, 2019, 34(14): 2913-2921. Wang Yao, Zhang Yanfeng, Niu Feng, Zhao Shuangle, Li Kui. Characterization and Measurement Method of DC Arc Electromagnetic Radiation for Photovoltaic Systems. Transactions of China Electrotechnical Society, 2019, 34(14): 2913-2921.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.180711          https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I14/2913