基于串联电阻估计的光伏阵列热斑故障诊断方法  

Hot Spot Failure Diagnosis Method for Photovoltaic Array Based on Series Resistance Estimation

作　　者：王方政 刘喜泉 陈浈斐[2] 喻洋 晏璐 WANG Fangzheng;LIU Xiquan;CHEN Zhenfei;YU Yang;YAN Lu(Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]中国长江三峡集团有限公司科学技术研究院,北京100038 [2]河海大学能源与电气学院,江苏南京211100

出　　处：《智慧电力》2022年第10期61-69,共9页Smart Power

基　　金：国家自然科学基金资助项目(51907052);中国长江三峡集团有限公司科研项目(WWKY-2021-0049)。

摘　　要：光伏面板由于部分遮阴或者光照不均匀所带来的热斑故障,可能导致整个光伏面板的输出功率降低,严重时可能造成光伏面板的烧毁。首先针对单个光伏电池推导出其数学模型,继而推广到采用SP结构的光伏阵列;接着对热斑故障的机理进行了分析,并分析了旁路二极管对于光伏面板的保护作用;通过将传统的电压、电流定位法、时间跟踪描述和光伏电池参数估计模型相结合,给出一种故障诊断方法,从而判断热斑故障发生的位置和严重程度;最后,通过对光伏阵列进行仿真建模,分析热斑故障对光伏阵列输出特性的影响,验证了所提故障诊断方法的可行性。Partial shading or uneven illumination can cause hot spot failure of photovoltaic panel,leading in turn to the output power reduction of the whole photovoltaic panel,and even the photovoltaic panel damage.To solve this problem,this paper firstly deduces the mathematical model of a single photovoltaic cell,and then applies it to the photovoltaic array with SP structure.Then the paper analyzes the mechanism of the hot spot failure and the protection effect of bypass diode on the photovoltaic panel.On this basis,by combining the traditional voltage and current location method,time tracking description and photovoltaic cell parameter estimation model,a fault diagnosis method is proposed to determine the location and severity of the hot spot failure.Finally,the photovoltaic array is modeled by simulation software to analyze the influence of the hot spot failure on the output characteristics of the photovoltaic array,and to verify the feasibility of the proposed method.

关 键 词：光伏阵列 电流失配 热斑效应 数学模型 故障诊断 

分 类 号：TM615[电气工程—电力系统及自动化]