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Cascaded DC-DC converter connection of photovoltaic modules
Walker, G. R. and Sernia, P. C. (2004) Cascaded DC-DC converter connection of photovoltaic modules. Ieee Transactions On Power Electronics, 19 4: 1130-1139.
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| Author(s) |
Walker, G. R.
Sernia, P. C.
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| Title |
Cascaded DC-DC converter connection of photovoltaic modules
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| Journal name |
Ieee Transactions On Power Electronics
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| Publication date |
2004
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| Volume number |
19
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| Issue number |
4
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| ISBN |
0885-8993
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| Start page |
1130
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| End page |
1139
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| Total pages |
10
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| Editor(s) |
J. van Wyk
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| Place of publication |
Piscatawy, NJ
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| Publisher |
The Institute of Electrical and Electronics Engineers
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| Collection year |
2004
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| Subject |
C1
290901 Electrical Engineering
660400 Conservation and Efficiency
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| Abstract |
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 panels, or many small dc-ac inverters which connect one or two panels directly to the ac grid. This paper proposes an alternative topology of nonisolated per-panel dc-dc converters connected in series to create a high voltage string connected to a simplified dc-ac inverter. This offers the advantages of a converter-per-panel approach without the cost or efficiency penalties of individual dc-ac grid connected inverters. Buck, boost, buck-boost, and Cuk converters are considered as possible dc-dc converters that can be cascaded. Matlab simulations are used to compare the efficiency of each topology as well as evaluating the benefits of increasing cost and complexity. The buck and then boost converters are shown to be the most efficient topologies for a given cost, with the buck best suited for long strings and the boost for short strings. While flexible in voltage ranges, buck-boost, and Cuk converters are always at an efficiency or alternatively cost disadvantage.
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| Keyword(s) |
Engineering, Electrical & Electronic
Cascaded Converter
Grid Connected Photovoltaic (pv)
Matlab Efficiency Simulation
Maximum Power Point Tracking (mppt)
Module Integrated Converters (mics)
Multilevel Converter
Series Connected Converter
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