Method for Determining Parameters of PV Modules in Field Conditions

Abstract

A new method for extracting the photovoltaic (PV) module equivalent circuit parameters from the current-voltage measurements in field conditions is proposed. The method is based on analytical decomposition of non-linear equations for current-voltage characteristics on the dimensionless small parameters and the subsequent fast convergence iterative procedure. When solving a system of non-linear equations, it is not necessary to specify the initial values of the PV module parameters, as is necessary in the Newton-Raphson method. The developed method shows stable work with measurements carried out in variable solar irradiation and good agreement of calculated current-voltage characteristic with preprocessed experimental ones.