Abstract
Models for photovoltaic (PV) cells and panels, based on the diode equivalent circuit, have been widely used because they are effective tools for system design. Many authors have presented simplified one-diode models whose three or four parameters are calculated using the data extracted from the datasheets issued by PV panel manufactures and adopting some simplifying hypotheses and numerical solving techniques. Sometimes it may be difficult to make a choice among so many models. To help researchers and designers working in the area of photovoltaic systems in selecting the model that is fit for purpose, a criterion for rating both the usability and accuracy of simplified one-diode models is proposed in this paper. The paper minutely describes the adopted hypotheses, analytical procedures and operative steps to calculate the parameters of the most famous simplified one-diode equivalent circuits. To test the achievable accuracy of the models, a comparison between the characteristics of some commercial PV modules issued by PV panel manufacturers and the calculated current-voltage (I-V) curves, at constant solar irradiance and/or cell temperature, is carried out. The study shows that, even if different usability ratings and accuracies are observed, the simplified one-diode models can be considered very effective tools.
Highlights
A mathematical model used to simulate physical behaviours of PV modules needs a compromise between analytical complexity and achievable precision [1].The one-diode model is a simplified version of the two-diode model proposed by Wolf [2] in order to represent the physical structure of a PV cell
I-V curves for values of the solar irradiance and the cell temperature far from the SRC; this using following expressions: of the the analysed models, the mean absolute difference (MAD) for current and power was calculated condition is obviously due to the different approaches adopted to describe the effects of the solar using the following expressions: irradiance and the cell temperature
The analytical procedures to calculate the parameters of the models based on the simplified one-diode equivalent circuit were described, along with the simplifying hypotheses adopted
Summary
A mathematical model used to simulate physical behaviours of PV modules needs a compromise between analytical complexity and achievable precision [1]. The Appendix A; such a review contains the sequence of operative steps to calculate the model parameters
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