An approach to precise modeling of photovoltaic modules under changing environmental conditions

Equivalent circuit models of photovoltaic (PV) modules are used to investigate the performance of PV systems for different operating conditions. The electrical characteristics of PV modules change as environmental conditions vary. Hence, for an accurate study of the PV modules when insolation and temperature are variable, it is necessary to verify the dependence of the parameters of the PV module model to insolation and temperature. This paper proposes a single-diode model of PV modules based on a novel approach for extracting the climate-dependent parameters. The parameters of the model are updated for given environmental conditions so that the model is able to precisely yield the corresponding real characteristics of the PV module. Comparison between the simulated model and experimentally measured data demonstrates the effectiveness of the developed approach in determining the PV characteristics under variable weather conditions. The proposed model can be helpful to properly design and select PV systems.

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