Parameters Estimation of Solar PV Modules Based on Single-Diode Model

Abstract

Solar photovoltaic (PV) systems directly convert sun light into electricity. The accurate modelling of solar PV modules is essential when designing PV systems, and it requires the correct estimation of a number of parameters, such as: diode ideality factor, series and shunt resistances. These values are not included in the manufacturer's datasheet, and they must be estimated by the modeller to predict the performance of the solar PV module. The aim of this paper is modelling and simulation of solar PV module by estimating parameters of nonlinear I-V curve of solar PV module using a single-diode model. The parameters estimation is carried out by numerical technique using Newton-Raphson method by adjusting the I-V curve at three points which are provided by all commercial datasheets: short circuit current, maximum power, and open circuit voltage. The established model allows to predict the performance of the solar PV module at different environmental factors. The accuracy of the model is validated by testing KYOCERA KC125GT solar PV module at field. Results of the analysis presented in this paper show that the established model presents favorable efficiency.