基于扩展频域时域反射法的在线光伏阵列故障检测信号特性研究  

Research on signal characteristics of online photovoltaics array fault detection using spread spectrum time domain reflectometry

作　　者：苏伟鸿 高德东 王珊 王永鑫 Su Weihong;Gao Dedong;Wang Shan;Wang Yongxin(The College of Mechanical Engineering,Qinghai University,Xining 810016,China;Xining Urban Vocational&Technical College,Xining 810016,China)

机构地区：[1]青海大学机械工程学院,青海西宁810016 [2]西宁城市职业技术学院,青海西宁810016

出　　处：《可再生能源》2024年第3期323-330,共8页Renewable Energy Resources

基　　金：青海省科技厅项目(2019-HZ-822)。

摘　　要：基于扩展频域时域反射法(Spread Spectral Time Domain Reflectometry,SSTDR)的光伏阵列故障诊断方法存在检测盲区和衰减特性,有必要研究检测信号的性质以提高故障检测性能。首先,对检测信号在光伏阵列中的传输行为进行研究,探究不同信号参数对检测范围和精度的影响;其次,根据光伏电池的动态模型和排布规律,搭建光伏阵列故障检测仿真平台,通过断路故障仿真实验对结果进行验证,结果表明,改善信号能有效增强相关峰辨识能力,使光伏组件检测数量增加4块;最后,综合考虑检测盲区和衰减特性对检测性能的影响,提出基于SSTDR的光伏阵列故障检测信号选择策略,用以确定测距范围和最优信号参数。The photovoltaic(PV)array fault detection method based on Spread Spectral Time Domain Reflectometry(SSTDR)has detection blind spots and attenuation characteristics.It is necessary to study the property of the detection signal to improve the fault detection performance.Firstly,the transmission behavior of the detection signal in the PV array is studied to explore the influence of different signal parameters on the detection range and accuracy.Secondly,based on the dynamic model and layout pattern of the PV cells,a simulation platform for PV array fault detection is established.The simulation results are validated through a simulated experiment of an open-circuit fault.The results show that improving the signal can effectively enhance the ability to identify correlation peaks,increasing the number of PV components detected by four units.Finally,the influence of blind area and attenuation characteristics is comprehensively analyzed.A signal selection strategy of PV array based on SSTDR is proposed to determine the fault detection distance and the optimal parameters of test signal.

关 键 词：扩展频谱时域反射法 光伏阵列 故障诊断 信号特性 

分 类 号：TK514[动力工程及工程热物理—热能工程]