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Efekt badań statutowych
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Finansowanie:
This work was financially supported through the funds granted to the Faculty of Environmental Engineering, Lublin University of Technology, Poland, grant number FD-20/IS-6/013.
The polycrystalline silicon photovoltaic system located in Poland has been investigated
from a modeling and an experimental perspective. The five-parameter single-diode (SD) model was
used to compute the current–voltage (I-V) characteristics of the PV modules for weather conditions
measured during one year (2022) of PV system operation. Based on the I-V curves, the PV power
output, monthly energy yields, and performance were simulated. Besides the single-diode method,
the Osterwald model (OM) was used to estimate the power output of the PV system under scrutiny.
The modeling results were compared to the experimental data. The determination coefficient (R2),
root mean square error (RMSE), mean bias error (MBE), and relative error (RE) were utilized to
quantify the quality of both models. The highest R2 value of 0.983 (power output) was found for
March, a relatively cold and sunny month in the analyzed period. The lowest values of the RMSE
and the MBE were found to be 5% and 1%, respectively. A high correlation between the modeled and
the experimental daily yield was noticed in June, which was the sunniest month of the year. Median
values were found to be 5.88 kWh/kW (measurement), 5.87 kWh/kW (SD), and 5.87 kWh/kW (OM).
The RE of the monthly array yield was found to be below 1% (summer half-year) in terms of the
single-diode method. The strong correlation between the simulated and the experimental findings
was also noticed for the medians of the DC performance ratio (PRDC). The median values of the
PRDC from May to July were found to be in the range between 0.88 and 0.94
