Estimation of equivalent circuit parameters of PV module
by using a new half analytical five point method
S. Kolsi1*, M. Ben Amar 2, H. Samet3, A. Ouali1
1 ACEM Research Unit, Department of Electrical Engineering, National Engineering School of Sfax, B.P. 1173, 3038 , Sfax, Tunisia
2 Department of Physics, Science Faculty of Sfax, B.P. 802, 3038,
3 Electronic Laboratory and Information Technology, Department of Electrical Engineering, National Engineering School of Sfax, B.P. 1173, 3038 , Sfax, Tunisia
* Corresponding author. E-mail: email@example.com
Received: 16 February 2009; revised version accepted: 03 July 2009
The photovoltaic module current-voltage mathematical description is usually defined by a coupled nonlinear equation, difficult to solve using analytical methods. The five important parameters, which characterize the photovoltaic module, are the diode reverse saturation current, the series resistance, the ideality factor, the shunt resistance and the photocurrent. In this paper, we present a new half analytical method which enables to extract these five parameters with a sufficient degree of precision based on five points in a given experimental current-voltage characteristic of a polycrystalline PV module. We compare our method with the previous models developed in the literature for different temperature and irradiance. The results of the current voltage characteristic obtained from our model are in satisfactory agreement with the experimental data. The current relative error at the vicinity of functioning point of PV module is less than 2.18%.
Keywords: Photovoltaic model; I-V characteristic; PV model parameters.