Identification of Photovoltaic Array Model Parameters. Modelling and Experimental Verification

Abstract

. This paper aims to identify the model parameters

of a photovoltaic array installed in our experimental platform.

Two methods used for parameters identification in order to

characterize the photovoltaic array are compared. Based on the

electrical equivalent circuit of the photovoltaic cell, the

mathematical model is deduced. From the data-sheet values,

given by the manufacturer, we were able to determine the

parameters of this model. On the other hand, the second method

was applied by using one of the least squares fitting approaches.

The measurement of the outdoor solar irradiance, cell

temperature and current taken by dSPACE controller board and

for a constant terminal voltage level includes the necessary data

to be fitted with the model. The implementation of two methods

in MATLAB provides the model parameters which have to

minimize as soon as possible the error involved between the

calculated and measured output current. For the minimum

obtained error, the corresponding method is the best one for the

photovoltaic array characterization.