A Novel Topology for Photovoltaic DC/DC Full-Bridge Converter With Flat Efficiency Under Wide PV Module Voltage and Load Range

Author

Lee, Jong-Pil ; Min, Byung-Duk ; Kim, Tae-Jin ; Yoo, Dong-Wook ; Yoo, Ji-Yoon

Author_Institution

Korea Electrotechnol. Res. Inst., Changwon

Volume

55

Issue

7

fYear

2008

fDate

7/1/2008 12:00:00 AM

Firstpage

2655

Lastpage

2663

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.

Keywords

DC-DC power convertors; dc/dc full-bridge converter; load range; photovoltaic converter; photovoltaic module voltage; photovoltaic power conditioning system; power 25 kW; power 250 kW; power rating; DC-DC power converters; Personal communication networks; Photovoltaic systems; Power conditioning; Power generation; Solar power generation; Temperature; Topology; Voltage control; Zero voltage switching; DC/DC full-bridge converter; photovoltaic (PV) power conditioning system (PCS); voltage balance control; zerovoltage switching (ZVS);

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2008.924165

Filename

4550671