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Continuous-Input Continuous-Output Current Buck-Boost DC/DC Converters for Renewable Energy Applications: Modelling and Performance Assessment

1
Electrical and Control Engineering Department, Arab Academy for Science, Technology and Maritime Transport, Alexandria 1029, Egypt
2
Electronics and Electrical Engineering Department, Strathclyde University, Glasgow G11XW, UK
*
Author to whom correspondence should be addressed.
Energies 2019, 12(11), 2208; https://doi.org/10.3390/en12112208
Received: 21 April 2019 / Revised: 24 May 2019 / Accepted: 27 May 2019 / Published: 10 June 2019
(This article belongs to the Section Solar Energy and Photovoltaic Systems)
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Abstract

Stand-alone/grid connected renewable energy systems (RESs) require direct current (DC)/DC converters with continuous-input continuous-output current capabilities as maximum power point tracking (MPPT) converters. The continuous-input current feature minimizes the extracted power ripples while the continuous-output current offers non-pulsating power to the storage batteries/DC-link. CUK, D1 and D2 DC/DC converters are highly competitive candidates for this task especially because they share similar low-component count and functionality. Although these converters are of high resemblance, their performance assessment has not been previously compared. In this paper, a detailed comparison between the previously mentioned converters is carried out as several aspects should be addressed, mainly the converter tracking efficiency, conversion efficiency, inductor loss, system modelling, transient and steady-state performance. First, average model and dynamic analysis of the three converters are derived. Then, D1 and D2 small signal analysis in voltage-fed-mode is originated and compared to that of CUK in order to address the nature of converters’ response to small system changes. Finally, the effect of converters’ inductance variation on their performance is studied using rigorous simulation and experimental implementation under varying operating conditions. The assessment finally revels that D1 converter achieves the best overall efficiency with minimal inductor value. View Full-Text
Keywords: continuous-input current; continuous-output current; buck-boost; DC/DC converters; renewable energy system; photovoltaic; MPPT; dynamic modelling; and small-signal analysis continuous-input current; continuous-output current; buck-boost; DC/DC converters; renewable energy system; photovoltaic; MPPT; dynamic modelling; and small-signal analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zakzouk, N.E.; Khamis, A.K.; Abdelsalam, A.K.; Williams, B.W. Continuous-Input Continuous-Output Current Buck-Boost DC/DC Converters for Renewable Energy Applications: Modelling and Performance Assessment. Energies 2019, 12, 2208.

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