Cascaded DC–DC Converter Connection of Photovoltaic Modules
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| Title | Cascaded DC–DC Converter Connection of Photovoltaic Modules |
| Publication Type | Journal Article |
| Year of Publication | 2004 |
| Authors | Walker G.R., Sernia P.C. |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 19 |
| Pagination | 1130–1139 |
| Date Published | jul |
| ISSN | 0885-8993 |
| Keywords | (PV), Cascaded converter, grid connected photovoltaic, Matlab efficiency simulation, maximum power point tracking (MPPT), module integrated converters (MICs), multilevel converter, series connected converter. |
| Abstract | —New residential scale photovoltaic (PV) arrays are commonly connected to the grid by a single dc–ac inverter con- nected 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 con- nected 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 Cúk 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 eval- uating 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 Cúk converters are always at an efficiency or alternatively cost disadvantage. |
| URL | http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1310401 |
| DOI | 10.1109/TPEL.2004.830090 |
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