A Novel Topology for Photovoltaic DC/DC Full-Bridge Converter With Flat Efficiency Under Wide PV Module Voltage and Load Range
Jong-Pil Lee
Byung-Duk Min
Tae-Jin Kim
Dong-Wook Yoo
Ji-Yoon Yoo
Korea Electrotechnol. Res. Inst., Changwon;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: July 2008
Volume: 55,
Issue: 7
On page(s): 2655-2663
ISSN: 0278-0046
INSPEC Accession Number: 10074565
Digital Object Identifier: 10.1109/TIE.2008.924165
Current Version Published: 2008-06-24
Abstract
In this paper, a novel topology for a photovoltaic (PV) dc/dc converter that can dramatically reduce the power rating and increase the efficiency of a PV system by analyzing PV module characteristics is proposed. Based on the analysis, in the proposed topology, only 30.7% power of the total PV system is needed for a dc/dc converter. Furthermore, the dc/dc converter efficiency curve is flat under wide PV module voltage and all load ranges. In particular, the converter efficiency at the lower duty range is dramatically improved. The total PV system is implemented for a 250-kW PV power conditioning system (PCS). This system has only three dc/dc converters with a 25-kW power rating. It is only one-third of the total PV PCS power. The 25-kW prototype PV dc/dc converter is introduced to experimentally verify the proposed topology. In addition, an experimental result shows that the proposed topology exhibits a good performance.
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