Design and Experimental Validation of a Single-Stage PV String Inverter with Optimal Number of Interleaved Buck-Boost Cells

Artem Fesenko, Oleksandr Matiushkin, Oleksandr Husev, Dmitri Vinnikov, Ryszard Strzelecki and Piotr Kołodziejek
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Artem Fesenko: Department of Radiotechnics and Embedded Systems, Chernihiv Polytechnic National University, 14039 Chernihiv, Ukraine
Oleksandr Matiushkin: Department of Radiotechnics and Embedded Systems, Chernihiv Polytechnic National University, 14039 Chernihiv, Ukraine
Oleksandr Husev: Department of Radiotechnics and Embedded Systems, Chernihiv Polytechnic National University, 14039 Chernihiv, Ukraine
Dmitri Vinnikov: Power Electronics Research Group, Tallinn University of Technology, 19086 Tallinn, Estonia
Ryszard Strzelecki: Faculty of Electrical and Control Engineering, Gdansk University of Technology, 80233 Gdansk, Poland
Piotr Kołodziejek: Faculty of Electrical and Control Engineering, Gdansk University of Technology, 80233 Gdansk, Poland

Energies, 2021, vol. 14, issue 9, 1-17

Abstract: Increasing converter power density is a problem of topical interest. This paper discusses an interleaved approach of the efficiency increase in the buck-boost stage of an inverter with unfolding circuit in terms of losses in semiconductors, output voltage ripples and power density. Main trends in the power converter development are reviewed. A losses model was designed and used for the proposed solution to find an optimal number of interleaved cells. It describes static and dynamic losses in semiconductor switches for buck and boost mode. The presented calculation results demonstrate the efficiency of the interleaved approach for photovoltaic system. 1 kW power converter prototype was designed with two parallel dc-dc cells for experimental verification of obtained theoretical results. The experimental results confirm theoretical statements.

Keywords: buck-boost cell; unfolding circuit; interleaved approach (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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