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 (I
₀
) 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.