A fast computing three point model for PV system in uniform and non-uniform conditions

Design, planning, and control of a photovoltaic (PV) system demand an accurate and fast computing PV model. The existing PV models suffer with either inaccuracy or large computational time. This paper proposes an explicit PV model that can be evaluated from the three points mentioned in the PV module data-sheet. The proposed model is examined through numerical simulations and experiments under uniform and non-uniform environmental conditions. It has three salient features: (i) easily adjustable to the different irradiance and temperature, (ii) faster than the ideal PV model, and (iii) as accurate as the practical PV model. The proposed model provides a clear advantage over a few other models (polynomial and Lambert W) in the computation accuracy and time when a large PV system is studied in non-uniform irradiance.