Cascaded DC-DC converter connection of photovoltaic modules

Walker, G. R. and Sernia, P. C. (2002). Cascaded DC-DC converter connection of photovoltaic modules. In: G. Holmes and N. Ertugurul, 33rd Annual Power Electronics Specialists Conference. PESC '02, Cairns, (24-29). 23-27 June, 2002. doi:10.1109/PSEC.2002.1023842

Author Walker, G. R.
Sernia, P. C.
Title of paper Cascaded DC-DC converter connection of photovoltaic modules
Conference name PESC '02
Conference location Cairns
Conference dates 23-27 June, 2002
Proceedings title 33rd Annual Power Electronics Specialists Conference
Place of Publication Piscataway, NJ
Publisher The Institute of Electrical and Electronics Engineers
Publication Year 2002
Sub-type Fully published paper
DOI 10.1109/PSEC.2002.1023842
ISBN 0-7803-7262-X
Editor G. Holmes
N. Ertugurul
Volume 1
Start page 24
End page 29
Total pages 6
Collection year 2002
Language eng
Abstract/Summary New residential scale photovoltaic (PV) arrays are commonly connected to the grid by a single DC-AC inverter connected to a series string of PV modules, or many small DC-AC inverters which connect one or two modules directly to the AC grid. This paper shows that a "converter-per-module" approach offers many advantages including individual module maximum power point tracking, which gives great flexibility in module layout, replacement, and insensitivity to shading; better protection of PV sources, and redundancy in the case of source or converter failure; easier and safer installation and maintenance; and better data gathering. Simple nonisolated per-module DC-DC converters can be series connected to create a high voltage string connected to a simplified DC-AC inverter. These advantages are available without the cost or efficiency penalties of individual DC-AC grid connected inverters. Buck, boost, buck-boost and Cuk converters are possible cascadable converters. The boost converter is best if a significant step up is required, such as with a short string of 12 PV modules. A string of buck converters requires many more modules, but can always deliver any combination of module power. The buck converter is the most efficient topology for a given cost. While flexible in voltage ranges, buck-boost and Cuk converters are always at an efficiency or alternatively cost disadvantage.
Subjects EX
290901 Electrical Engineering
660205 Solar-photoelectric
Q-Index Code EX

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Created: Fri, 24 Aug 2007, 01:28:31 EST