Parameter Extraction of Single-Diode Model From Module Datasheet Information Using Temperature Coefficients

Abstract

The single-diode model (SDM) is used widely for modeling of photovoltaic cells and modules because of its simplicity and accuracy. The main objective of this article is to propose a new method to estimate the five unknown parameters of the SDM under standard test conditions using the module datasheet information (MDI) alone. The proposed method specifically uses the temperature coefficient (TC) of the maximum power of the module given in the MDI in conjunction with three physical or empirical models of the TCs of the photo-induced current, the diode reverse saturation current, and the diode ideality factor. It is well known that four equations that limit these parameters can be deduced naturally from the MDI, and a new fifth equation was deduced in this research from the MDI and the three TC models above without no simplification or other assumptions. The nonlinear equations for the SDM's parameters were solved using a simple mesh search algorithm. Finally, the proposed method was extended to produce an adaptive model to enable estimation of the SDM parameters at any irradiance and temperature.