This paper presents a new, simple, accurate, and inexpensive practical methodology and experimental solution for the modeling of conventional (domestic and commercial facilities) photovoltaic generators (PVG), so that they can work at their maximum power point (MPP). The PVG may be a panel, an array of panels, or a photovoltaic field. As a starting restriction (actual) it has to be assumed that it is not possible to isolate the PVG variables dependence (mainly current, voltage, and hence power) with solar radiation and temperature, because they are highly correlated. This methodology proposes the modeling facility on its MPP by its MPP resistance ( R MPP  =  V MPP / I MPP ), being V MPP and I MPP the voltage and current of the PVG, respectively, at its MPP. The analysis shows, by simulation first and then experimentally, that R MPP does not present significant temperature dependencies, at least in the usual range. This important result allows us to model the PVG only in terms of solar radiation. From a set of experimental data, different models to estimate R MPP are proposed. The obtained results are very accurate. These models allow an immediate practical application that it is also developed in the paper: MPP tracker (MPPT) design by the calculation of the DC/DC converter duty cycle which places the PVG at its MPP directly and continuously. This new methodology and experimental system has been registered in the Spanish Patent and Trademark Office with the number P201530352. Copyright © 2015 John Wiley & Sons, Ltd. This paper described a new methodology for modeling of conventional photovoltaic systems at its maximum power point (MPP), based on the photovoltaic generators resistance at this point ( R MPP  =  V MPP / I MPP ). Thus, from a set of experimental data, different models that estimate R MPP are proposed. This paper also presents various models that estimate the duty cycle of the direct current /direct current converter that place the facility to this MPP, δ MPP , allowing the MPP tracking in a direct way.


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    Titel :

    Maximum power point tracker based on maximum power point resistance modeling



    Erschienen in:

    Erscheinungsdatum :

    2015




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    53.36 Energiedirektumwandler, elektrische Energiespeicher



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