Low-Complexity MPPT Technique Exploiting the PV Module MPP Locus Characterization
Scarpa, V.
Buso, S.
Spiazzi, G.
Dept. of Inf. Eng., Univ. of Padova, Padova;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: May 2009
Volume: 56,
Issue: 5
On page(s): 1531-1538
ISSN: 0278-0046
INSPEC Accession Number: 10601687
Digital Object Identifier: 10.1109/TIE.2008.2009618
First Published: 2008-11-25
Current Version Published: 2009-04-28
Abstract
This paper proposes a method for tracking the maximum power point (MPP) of a photovoltaic (PV) module that exploits the relation existing between the values of module voltage and current at the MPP (MPP locus). Experimental evidence shows that this relation tends to be linear in conditions of high solar irradiation. The analysis of the PV module electrical model allows one to justify this result and to derive a linear approximation of the MPP locus. Based on that, an MPP tracking strategy is devised which presents high effectiveness, low complexity, and the inherent possibility to compensate for temperature variations by periodically sensing the module open circuit voltage. The proposed method is particularly suitable for low-cost PV systems and has been successfully tested in a solar-powered 55-W battery charger circuit.
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