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The performance of photovoltaic (PV) modules can
be assessed using several models, with the most common being
the Osterwald model, which states PV power is proportional
to solar irradiance. However, the models based on electrical
equivalent circuits, which have a variable number of parameters
affected by environmental conditions like irradiance and
temperature, can be used to increase the accuracy of PV power
estimation. Actually, understanding these parameters in any
weather condition can help predict PV generators’ performance
with higher accuracy than commonly used analytical models.
This work is inserted in a research field aiming to develop
a model for the automatic diagnosis of PV plants by their
inverters based on the equivalent circuit’s parameters. This
study compares the application of a method for evaluating PV
power based on the single diode model to PV modules tested
at two different installation sites. The devices under test are 7
modules, tested in Turin (Italy) and Ja´en (Spain), with different
technologies, rated power (up to 370 W) and efficiency (up
to ≈21%). The accuracy of such a technique is validated by
comparing the power estimation by such a methodology with
that of the Osterwald model.
Index Terms—high efficiency PV modules, equivalent circuit’s
parameters, single diode model, parameters extraction, Simulated
Annealing, Nelder–Mead.
