Parameter extraction algorithm for one-diode model of PV panels based on datasheet values

A photovoltaic (PV) panel model is at the heart of an accurate performance model for a large PV farm. This paper presents an algorithm to calculate the parameters of the one-diode model of PV modules based solely on the manufacturer's datasheets. The important feature of this algorithm is that through reformulation of the characteristic equations at various points of the current-voltage (I-V) curve, the unknown model parameters can be determined analytically. This is in contrast to many existing models which choose a value for one parameter and then calculate the other parameters through simultaneous solution of the system of equations. The calculated I-V curve is then compared with the manufacturer's curve to validate the proposed algorithm and quantify the modeling error.