一种基于光电隔离和频率检测的光伏板故障检测方法

Photovoltaic Panel Fault Detection Method Based on Optoelectronic Isolation and Frequency Detection

针对由于局部遮荫引起的热斑故障导致光伏板无法正常工作的问题,提出了一种基于光电隔离和频率检测的光伏板故障检测方法。首先设计了由光电隔离与RC振荡器构成的光伏板故障检测电路,利用光电隔离将光伏板的电流信号转化为阻值信号,控制RC振荡频率;然后设计了电路拓扑,依次检测模块频率参数,计算出相应的光伏板相对偏差,判断光伏板是否存在热斑故障;最后搭建实物电路与Proteus仿真实验,结果表明故障光伏板的输出频率及其相对偏差较低,可有效检测出光伏板热斑故障。

Aiming at the hot spot failure caused by local shading of photovoltaic panels,which makes photovoltaic panels unable to work normally,a photovoltaic panel fault detection circuit composed of optoelectronic isolation and RC oscillator is proposed.Firstly,a photovoltaic panel fault detection circuit composed of photoelectric isolation and RC oscillator is designed,and the current signal of photovoltaic panel is converted into a resistance signal by photoelectric isolation to control the RC oscillation frequency.Then the circuit topology is designed,the module frequency parameters are detected in turn,the relative deviation of corresponding photovoltaic panels is calculated,and the existence of hot spot faults in photovoltaic panels is judged.Finally,the physical circuit and Proteus simulation experiment are built,and the results show that the output frequency of faulty photovoltaic panel and its relative deviation are low,which can effectively detect the hot spot fault of photovoltaic panel.