This work presents a simple and low-cost curve tracer for the analysis of photovoltaic (PV) modules. The proposed system allows the plotting of current versus voltage (I-V) and power versus voltage (P-V) characteristics in a fast and straightforward approach employing a dc-dc single-ended primary inductance converter (SEPIC) topology. Thus, it is possible to obtain variable impedance seen from the PV source by properly adjusting the duty cycle imposed to the active switch and consequently, by plotting several points that accurately define the aforementioned curves. The curve tracer is analyzed through simulation and experimental tests while its performance is evaluated considering uncontrolled environmental conditions and also the eventual occurrence of partial shading.

中文翻译：

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绘制光伏模块的特性曲线：一种简单且可移植的方法

这项工作提出了一种简单且低成本的曲线示踪剂，用于分析光伏（PV）模块。所提出的系统允许采用采用DC-DC单端初级电感转换器（SEPIC）拓扑的快速，直接方法绘制电流与电压（IV）和功率与电压（PV）特性的曲线图。因此，可以通过适当地调整施加到有源开关的占空比并因此通过绘制精确定义上述曲线的几个点来获得从PV电源看到的可变阻抗。曲线跟踪器通过仿真和实验测试进行了分析，同时在考虑不受控制的环境条件以及最终出现局部阴影的情况下评估了曲线跟踪器的性能。