Computational Disparities between Critical Parameters of a Photovoltaic Array via Two Analytical Models

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Author(s) Guda, H. A. | Aliyu U. O.
Pages 283-289
Volume 5
Issue 5
Date May, 2015
Keywords Computational Disparities, PV Array, Simplified Analytical Models, Field Measurement, Manufacturer Datasheet y

Abstract

This paper presents the computational disparities between the leading parameters of a photovoltaic array (V_oc,I_(sc,) V_mp,I_mp,P_mp,FF and η) installed at the Faculty of Engineering and Engineering Technology of Abubakar Tafawa Balewa University, Bauchi, Nigeria. There is no doubt that Photovoltaic modeling has evolved over the years with attention focused more on analytical approach anchored on the readily available manufacturer’s data for the PV module. The alternative approach of relying on field measurement to underpin the development of mathematical model for a PV array of interest has been largely unexplored. In this paper and for the sake of comparative evaluation, two mathematical models termed – Field Measurement Based PV Simplified Analytical Model (FMB-PV-SAM) and Manufacturer Datasheet Based PV Simplified Analytical Model (MDB-PV-SAM) have been individually used to determine the value of each leading parameter and the disparities between them graphically plotted as function of temperature. The results show that at low PV cell temperatures typically below 400C, the datasheet based model (MDB-PV-SAM) makes a very good approximation of the field measurement based model (FMB-PV-SAM) for computing all the leading PV array parameters except maximum power. However, the disparities at temperatures above 400C are particularly wide, thus indicating that the datasheet based model cannot replace the field measurement based model without significant loss of accuracy. Interestingly, smaller disparities are obtained with respect to maximum power of the array at temperatures above 500C higher rather than at lower temperatures.

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