Photovoltaic DC-DC module integrated converter for novel cascaded and bypass grid connection topologies - design and optimisation

Walker, Geoffrey R. & Pierce, Jordan C. (2006) Photovoltaic DC-DC module integrated converter for novel cascaded and bypass grid connection topologies - design and optimisation. In 37th IEEE Power Electronics Specialists Conference (PESC '06), IEEE, Piscataway, NJ, USA, pp. 1-7.

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Grid connected photovoltaic (PV) inverters fall into three broad categories - central, string and module integrated converters (MICs). MICs offer many advantages in performance and flexibility, but are at a cost disadvantage. Two alternative novel approaches proposed by the author - cascaded dc-dc MICs and bypass dc-dc MICs - integrate a simple non-isolated intelligent dc-dc converter with each PV module to provide the advantages of dc-ac MICs at a lower cost. A suitable universal 150 W 5 A dc-dc converter design is presented based on two interleaved MOSFET half bridges. Testing shows zero voltage switching (ZVS) keeps losses under 1 W for bi-directional power flows up to 15 W between two adjacent 12 V PV modules for the bypass application, and efficiencies over 94% for most of the operational power range for the cascaded converter application. Based on the experimental results, potential optimizations to further reduce losses are discussed.

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ID Code: 63552
Item Type: Conference Paper
Refereed: No
Keywords: DC-AC power convertors, DC-DC power convertors, design engineering, invertors, photovoltaic power systems, power MOSFET, switching convertors, zero voltage switching
DOI: 10.1109/PESC.2006.1712242
ISBN: 0780397169
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 12 Dec 2014 02:17
Last Modified: 06 Jan 2015 03:01

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