Input-Series-Output-Parallel Connected DC/DC Converter for a Photovoltaic PCS with High Efficiency under a Wide Load Range

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

Input-Series-Output-Parallel Connected DC/DC Converter for a Photovoltaic PCS with High Efficiency under a Wide Load Range

Vol. 10, No. 1, pp. 9-13, Dec. 2009

10.6113/JPE.2010.10.1.9

DC/DC converter

ISOP (Input-Series-Output-Parallel connected)

PCS

ZVS (Zero Voltage Switching)

PDF

Abstract

This paper proposes an input-series-output-parallel connected ZVS full bridge converter with interleaved control for photovoltaic power conditioning systems (PV PCS). The input-series connection enables a fully modular power-system architecture, where low voltage and standard power modules can be connected in any combination at the input and/or at the output, to realize any given specifications. Further, the input-series connection enables the use of low-voltage MOSFETs that are optimized for a very low RDSON, thus, resulting in lower conduction losses. The system costs decrease due to the reduced current, and the volumes of the output filters due to the interleaving technique. A 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 the PV module characteristics is proposed. The control scheme, consisting of an output voltage loop, a current loop and input voltage balancing loops, is proposed to achieve input voltage sharing and output current sharing. The total PV system is implemented for a 10-kW PV power conditioning system(PCS). This system has a dc/dc converter with a 3.6-kW power rating. It is only one-third of the total PV PCS power. A 3.6-kW prototype PV dc/dc converter is introduced to experimentally verify the proposed topology. In addition, experimental results show that the proposed topology exhibits good performance.

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Cite this article

[IEEE Style]

J. Lee, B. Min, T. Kim, D. Yoo, J. Yoo, "Input-Series-Output-Parallel Connected DC/DC Converter for a Photovoltaic PCS with High Efficiency under a Wide Load Range," Journal of Power Electronics, vol. 10, no. 1, pp. 9-13, 2010. DOI: 10.6113/JPE.2010.10.1.9.

[ACM Style]

Jong-Pil Lee, Byung-Duk Min, Tae-Jin Kim, Dong-Wook Yoo, and Ji-Yoon Yoo. 2010. Input-Series-Output-Parallel Connected DC/DC Converter for a Photovoltaic PCS with High Efficiency under a Wide Load Range. Journal of Power Electronics, 10, 1, (2010), 9-13. DOI: 10.6113/JPE.2010.10.1.9.