A photovoltaic (PV) module is an equipment that converts solar energy to electrical energy. A mathematical model should be presented to show the behavior of this device. The well-known single-diode and double-diode models are utilized to demonstrate the electrical behavior of the PV module. “Matlab/Simulink” is used to model and simulate the PV models because it is considered a major software for modeling, analyzing, and solving dynamic system real problems. In this work, a new modeling method based on the “Multiplexer and Functions blocks” in the "Matlab/Simulink Library" is presented. The mathematical analysis of single and double diodes is conducted on the basis of their equivalent circuits with simple modification. The corresponding equations are built in Matlab by using the proposed method. The unknown internal parameters of the PV panel circuit are extracted by using the PV array tool in Simulink, which is a simple method to obtain the PV parameters at certain weather conditions. Double-diode model results are compared with the single-diode model under various irradiances and temperatures to verify the performance and accuracy of the proposed method. The proposed method shows good agreement in terms of the I–V and P–V characteristics. A monocrystalline NST-120 W PV module is used to validate the proposed method. This module is connected to a variable load and tested for one summer day. The experimental voltage, current, and power are obtained under various irradiances and temperatures, and the I–V and P–V characteristics are obtained.

光伏（PV）模块是一种将太阳能转换为电能的设备。应提供一个数学模型来显示该设备的行为。众所周知的单二极管和双二极管模型用于演示 PV 模块的电气行为。“Matlab/Simulink”用于对光伏模型进行建模和仿真，因为它被认为是建模、分析和解决动态系统实际问题的主要软件。在这项工作中，提出了一种基于“Matlab/Simulink 库”中的“多路复用器和功能块”的新建模方法。单双二极管的数学分析是在其等效电路的基础上进行简单修改的​​。利用所提出的方法在Matlab中建立了相应的方程。利用Simulink中的光伏阵列工具提取光伏电池板电路的未知内部参数，是获取特定天气条件下光伏参数的一种简单方法。在各种辐照度和温度下将双二极管模型结果与单二极管模型进行比较，以验证所提出方法的性能和准确性。所提出的方法在以下方面表现出良好的一致性I – V和P – V特性。单晶 NST-120 W PV 模块用于验证所提出的方法。该模块连接到可变负载并测试了一个夏日。在各种辐照度和温度下获得实验电压、电流和功率，并获得I - V和P - V特性。