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Intelligent Industrial Systems
Published in: Intelligent Industrial Systems 1/2015

01-06-2015 | Original Paper

Multi String Grid-Connected PV System with LLC Resonant DC/DC Converter

Authors: Concettina Buccella, Carlo Cecati, Hamed Latafat, Kaveh Razi

Published in: Intelligent Industrial Systems | Issue 1/2015

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Abstract

This paper presents a grid-connected multi string photovoltaic (PV) system with a three level voltage source converter using double closed loop control strategy. The outer DC voltage control loop regulates the DC bus voltage while the inner current control loop synchronizes the output current with the grid voltage, thus ensuring unity power factor. In the proposed configuration, LLC resonant DC/DC converter is used to extract the maximum power and to boost the PV array voltage. It is intrinsically isolated by a high frequency transformer, so that the parasitic capacitance of the PV panels to ground could not be of concern; furthermore, because of soft switching technique, LLC converter operates at high frequency with low switching losses. Size and cost of the magnetic components and DC-link capacitor are decreased compared with traditional boost converters. An incremental conductance method integrated with PI controller is developed on LLC resonant converter to extract maximum power. Simulation studies confirm that the control design approaches taken are robust and the dynamic performance of the proposed system during fast solar irradiation changes is acceptable.
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Footnotes
1
\(k=\left( 1.3806503\times 10^{-23}\, {\hbox {J/K}}\right) .\)
 
2
\(q=1.60217646\times 10^{-19}\, {\hbox {C}}\).
 
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Metadata
Title
Multi String Grid-Connected PV System with LLC Resonant DC/DC Converter
Authors
Concettina Buccella
Carlo Cecati
Hamed Latafat
Kaveh Razi
Publication date
01-06-2015
Publisher
Springer Singapore
Published in
Intelligent Industrial Systems / Issue 1/2015
Print ISSN: 2363-6912
Electronic ISSN: 2199-854X
DOI
https://doi.org/10.1007/s40903-015-0006-9

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