光伏系统直流串联故障电弧检测方法  

Detection Methods of DC Series Arc Faults in the Photovoltaic System

作　　者：屈建宇 马龙涛 陈思磊 葛世伟 QU Jianyu;MA Longtao;CHEN Silei;GE Shiwei(State Grid Xi’an Electric Power Supply Company,Xi’an 710032,Shaanxi,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China;Zhejiang Tengen Electric Co.,Ltd.,Yueqing 325600,Zhejiang,China)

机构地区：[1]国网西安供电公司,陕西西安710032 [2]西安理工大学电气工程学院,陕西西安710048 [3]浙江天正电气股份有限公司,浙江乐清325600

出　　处：《电网与清洁能源》2021年第3期125-130,共6页Power System and Clean Energy

基　　金：中国博士后科学基金项目(2020M681928)。

摘　　要：故障电弧是光伏系统电气火灾事故的常见原因,研究可靠的光伏系统直流故障电弧检测方法对保障系统运行和人身安全有重要意义。首先搭建了光伏系统直流故障电弧实验平台,采集了故障电弧典型电信号;接着对其进行了稳定性分析、时变性分析、相关性分析和随机性分析,并以特征显著、计算量小、抗干扰强为比选条件,选取欧拉特征作为故障电弧检测的最优特征;然后构建了故障电弧检测算法,算法以多阈值判断体系为核心发掘故障电弧差异于系统暂态过程的特征模式;最后,将算法硬件实现后在系统中再进行实验测试。结果表明,所提出的算法对不同光伏系统工作点和电弧产生方式条件下的故障电弧均可在0.5 s内实现正确检测。As arc faults have become a common cause of electrical fire accidents in photovoltaic(PV)systems,it is of great significance to investigate a reliable DC arc fault detection method to ensure the PV system operation and personal safety.In this paper,an experimental platform of DC arc faults is built in the PV system,and typical arc fault current signals are collected.Next,the stability analysis,time-varying analysis,correlation analysis and randomness analysis are carried out.Considering the global effective separation in whole arc fault burning stage,less calculation loads and stronger antiinterference requirements,Euler features are selected as the optimal arc fault characteristic.Then an arc fault detection algorithm is constructed based on the above optimal Euler feature.The algorithm takes the multi-threshold judgment system as the core rule to discover the arc fault characteristic mode different from the system transient processes.Finally,the accuracy of the proposed arc fault detection algorithm is verified under conditions of different arc generation modes and system operating points,and the result shows that the arc faults can be detected successfully in 0.5 s under the conditions of different working points and arc generation modes of the photovoltaic system.

关 键 词：光伏系统 直流故障电弧 特征构建 检测方法 硬件验证 

分 类 号：TM711[电气工程—电力系统及自动化]