Utilização dos modelos de 4 e 5 parâmetros para módulos fotovoltaicos considerando condições climá-ticas próximas à linha do Equador

Abstract

This article presents the use of two mathematical models (MM) developed for photovoltaic modules (PVM). These are known as MM 4-parameter model - 4P (IL; I0; RS; a) and model parameters 5 - 5P (IL; I0; RS; Rsh; m). In this work were initially designed photovoltaic characteristic curves (IV). Then those curves were compared with the curves shown in PVM manufacturer's catalog used (KYOCERA the KC85T). It was noticed that for the maximum power point (MPP) developed with the curve 5P model showed better performance since no voltage error introduced, only current and power errors (0.01%). The 4P model in turn presented voltage error in the MPP 2.87% plus a 2.32% power error and current error at 0.57% MPP. None of MM error presented as short-circuit current. But as the open circuit voltage of the 4P model showed error of 1.84% while the 5P model showed error of 0.46%. Another study was done using field measurements collected in 2013. The measured data were irradiance, temperature on the surface of PVM, electrical voltage and current at the output of PVM. The first 3 figures cited were used as proposed in the MM input and from them met the estimated electric current to the output of PVM. Finally this chain was compared with the actual measured value. In this experiment the 4P model parameters showed better results since its average error (AE) relative to the current measured was 7.46% while the model presented 5P AE of 8.32%.