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Research Papers

Design of dc/dc Converters for DMPPT PV Applications Based on the Concept of Energetic Efficiency

[+] Author and Article Information
G. Adinolfi

DIIIE, Università di Salerno, Via Ponte Don Melillo, Fisciano Salerno, 84084 Italy

N. Femia

DIIIE, Università di Salerno, Via Ponte Don Melillo, Fisciano Salerno, 84084 Italyfemia@unisa.it

G. Petrone

DIIIE, Università di Salerno, Via Ponte Don Melillo, Fisciano Salerno, 84084 Italygpetrone@unisa.it

G. Spagnuolo

DIIIE, Università di Salerno, Via Ponte Don Melillo, Fisciano Salerno, 84084 Italygspagnuolo@unisa.it

M. Vitelli

DII, Seconda Università di Napoli, Real Casa dell’Annunziata, Aversa Caserta, 81031 Italyvitelli@unina.it

J. Sol. Energy Eng 132(2), 021005 (May 04, 2010) (10 pages) doi:10.1115/1.4001465 History: Received July 03, 2009; Revised February 02, 2010; Published May 04, 2010; Online May 04, 2010

Distributed maximum power point tracking (DMPPT) is one of the most promising solutions to overcome the drawbacks associated with mismatching phenomena in photovoltaic (PV) applications. DMPPT is based on the adoption of a dc/dc converter dedicated to each PV module. The design of the power stage of such a converter is a challenging task because of the very high efficiency requirements and of the continuous changes of the operating point during the day, depending on the sun irradiation conditions. In this paper the guidelines for the design of dc-dc converters for DMPPT applications are presented and discussed.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Grid-connected PV system with FMPPT

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Figure 2

Grid-connected PV system with DMPPT

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Figure 3

Boost converter fed by a PV module

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Figure 4

Daily plot of pMPP(t)

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Figure 5

Typical efficiency curve of a boost dc-dc converter

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Figure 6

Manufacturer parameters for some 150V N-channel FETs

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Figure 7

Operating zone on the efficiency curve

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Figure 8

Operating zone on the efficiency curve

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Figure 9

Adopted daily irradiation profile

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Figure 10

MPP current and voltage in correspondence of the daily irradiation profile of Fig. 9

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Figure 11

PV module voltage versus power characteristic

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Figure 12

Pareto front obtained by means of the stochastic algorithm using SolarWorld SW225

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Figure 13

Efficiency profile of solution 7

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Figure 14

Distribution of losses among the different components of solution 7

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Figure 15

Distribution of losses among the different components of solution 1

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Figure 16

Percent distribution of the energy losses

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Figure 17

Boost converter prototype

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Figure 18

Experimental evaluation of the converter efficiency

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Figure 19

Pareto front obtained by means of the stochastic algorithm using Kyocera KC125GHT-2

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Figure 20

Percent distribution of the energy losses

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