Abstract
In selecting a mathematical model for simulating physical behaviours, it is important to reach an acceptable compromise between analytical complexity and achievable precision. With the aim of helping researchers and designers working in the area of photovoltaic systems to make a choice among the numerous diode-based models, a criterion for rating both the usability and accuracy of one-diode models is proposed in this paper. A three-level rating scale, which considers the ease of finding the data used by the analytical procedure, the simplicity of the mathematical tools needed to perform calculations and the accuracy achieved in calculating the current and power, is used. The proposed criterion is tested on some one-diode equivalent circuits whose analytical procedures, hypotheses and equations are minutely reviewed along with the operative steps to calculate the model parameters. To assess the achievable accuracy, the current-voltage (I-V) curves at constant solar irradiance and/or cell temperature obtained from the analysed models are compared to the characteristics issued by photovoltaic (PV) panel manufacturers and the differences of current and power are calculated. The results of the study highlight that, even if the five parameter equivalent circuits are suitable tools, different usability ratings and accuracies can be observed.
Highlights
In the field of photovoltaics, the diode-based equivalent circuits of photovoltaic (PV) cells and modules have been widely used because they allow the designer to optimize the system performance and maximize the effectiveness of the economic investment
Many performance data can be found, because they are always listed in tabular form in the PV module datasheets, whereas some data can be extracted only if a complete set of I-V curves is provided by the manufacturers
A criterion for rating the usability and accuracy performances of diode-based equivalent circuits was tested on some one-diode models
Summary
In the field of photovoltaics, the diode-based equivalent circuits of photovoltaic (PV) cells and modules have been widely used because they allow the designer to optimize the system performance and maximize the effectiveness of the economic investment. PV the use mathematical tools simple algorithms to complex implemented devices it is useful to remember that, like a semiconductor diode, a cell consists of two layers of in dedicated computational software. The accuracy is a relevant parameter, even though its semiconductor material, usually silicon, differently doped, that are electrically connected to two achievable level may significantly depend on the physical characteristics of the modelled PV devices. That the absorption of light in semiconductors can, under certain conditions, create equivalent circuits used for modelling PV devices it is useful to remember that a PV cell is a diode an electric current due to the capability of the usually absorbed photons of converting fixed in made with two layers of semiconductor material, silicon, differently doped, that areelectrons electrically freely moving conduction electrons.
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