Modifications to Accelerate the Iterative Algorithm for the Two-diode Model of PV Module

This work proposes two modifications-namely Adaptive Search Range (ASR) and improved Newton-Raphson Method (iNRM), to enhance the computation speed of the iterative computational method for the two-diode model. These modifications significantly improve the computation speed without introducing any compromise in terms of accuracy. Moreover, they are very simple to implement and do not require any additional information as input. By implementing ASR, the algorithm is only required to calculate a fraction (25
^%
) of the P-V curve at every iteration. On the other hand, the iNRM improves the calculation of the curve by guiding the initial value of current for each point of voltage. To evaluate their effectiveness, the original algorithm and its modified versions are coded in Matlab script. They are used to identify the model parameters of three PV modules of different technologies. The computation time of the algorithm with both ASR and iNRM implemented is observed to be up to 4.7 times faster. Furthermore, the values of the model parameters are computed to be exactly equal-which implies that the accuracy of the original algorithm is retained. With these merits, the modifications are envisaged to be critical improvements to the algorithm, especially for application in computers with lower specifications.