Parameter Extraction Methodology of 1D2R PV Cell Electrical Model for Indoor Applications

Electrical models are used to compare the properties of PV cells and solar panels and to predict the characteristics of their I-V curves. Even though there is much research on the evaluation of these models for outdoor conditions, their indoor performance is still not fully investigated, despite the increasing interest for IoT applications. This work describes a method for extracting the parameters of a $20\times 40$ mm PV cell for the 1D2R electrical model at indoor conditions. An analytical procedure is presented, in which the 5 model parameters are calculated from 6 PV cell characteristic points. Translation equations are estimated for the characteristic points in function of illuminance level, reducing the amount of measurements. Results demonstrated good accuracy of the electrical model concerning measurement data for both procedures, with R² greater than 0.97. This modeling is fundamental for emulating the electrical behavior of PV cells under indoor conditions and can be used as input for characterization of energy harvesting circuits.