Optimization of perturbative PV MPPT methods through online system identification

Journal article (2014)

Authors

P. Manganiello University of Salerno
Mattia Ricco Observatoire de Paris
Giovanni Petrone University of Salerno
Eric Monmasson Observatoire de Paris
G. Spagnuolo University of Salerno
Affiliation
External organisation
DC-DC power converters Photovoltaic systems
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Published Date

01-12-2014

Language

English

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Abstract

The maximum power point (MPP) tracking function allows one to extract the maximum power from the photovoltaic (PV) system in any operating condition. The perturb and observe technique is one of the mainly used algorithms aimed at this function. Its performances depend on the values of the two design parameters, which are the amplitude and the frequency of the perturbations that it applies in identifying the position of the MPP. In this paper, a method for the online optimization of the perturbation period is presented. It is based on the identification of the whole system, including the PV source and the dc/dc converter controlling it. The system impulse and frequency responses are evaluated by using the cross-correlation method. Such a technique, as well as the tracking algorithm, is effectively implemented by using a field-programmable gate array, and it is validated by means of simulation and experimental results.