Comparative study on single diode photovoltaic module parameter extraction methods

This paper compares the different approaches for extraction of PV module parameters. The trust-region-doleg method is proposed here for extraction of five parameters such as series resistance (R_s), shunt resistance (R_p), diode ideality factor (a), dark saturation current (I₀) and photo-generated current (I_pv) under standard test conditions (STC). The comparative analysis is made by taking Villalva´s iterative method and proposed trust-region-dogleg method. Two parameters R_s and R_p are extracted by Villalva´s iterative method whereas all five unknown parameters can be extracted by proposed trust-region-dogleg method. The accuracy of parameters calculation depends on tolerance band and initial conditions are tabulated. The PV module behavior at different temperature and irradiance is also forecasted.