Solar Irradiance Estimation of Photovoltaic Module based on Thevenin Equivalent circuit Model

Abstract

 

  Abstract— This Paper presents an accurate method for estimation of solar irradiance of a PV module. The solar irradiance estimation method is derived using the efficient approximation of a PV model based on  Thevenin equivalent circuit . The short linear combination of exponential function is used for constructing a mathematical function that is used to express the Thevenin voltage source of a PV panel. The proposed algorithm for estimation of solar irradiance use Newton Raphson method based on extensively analysis of a photovoltaic mathematical model and it is applied for a wide range of operating point variations . The proposed method has the ability to estimate the parameters, which are required for constructing  the mathematical model of a PV in addition to estimate the solar irradiance . The accuracy and effectiveness of the proposed algorithm  is demonstrated in MATLAB for a photovoltaic  panel by using experimental data which is obtained from data sheet  under different operating conditions.

  Index Terms— photovoltaic modeling; pyranometer;  solar irradiance Photovoltaic Model; Thevenin equivalent circuit System; Exponential sum models.