Cascaded DC-DC converter connection of photovoltaic modules

Walker, Geoffrey R. & Sernia, Paul C. (2002) Cascaded DC-DC converter connection of photovoltaic modules. In Proceedings of IEEE 33rd Annual Power Electronics Specialists Conference, IEEE, Piscataway, NJ, pp. 24-29.

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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

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17 citations in Web of Science®

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ID Code: 63575
Item Type: Conference Paper
Refereed: No
Additional Information: Also available on CD-ROM in PDF format
cascaded DC-DC converter connection
photovoltaic modules
PV arrays
PV modules
small DC-AC inverters
converter per-module approach
maximum power point tracking
PV sources protection
converter failure
safer installation
data gathering
nonisolated per-module DC-DC converters
high voltage string
DC-AC inverter
efficiency penalties
cost penalties
DC-AC grid connected inverters
Cuk converters
buck-boost converters
boost converters
buck converters
module power
Keywords: DC-DC power convertors, photovoltaic power systems, solar cell arrays
DOI: 10.1109/PSEC.2002.1023842
ISBN: 078037262X
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Industrial Electronics (090603)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Renewable Power and Energy Systems Engineering (excl. Solar Cells) (090608)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2002 IEEE
Deposited On: 04 Mar 2014 23:22
Last Modified: 04 Mar 2014 23:24

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