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

Research output: Contribution to journalArticle

32 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)9-13
Number of pages5
JournalJournal of Power Electronics
Volume10
Issue number1
Publication statusPublished - 2010 Jan 1

Keywords

  • Dc/dc converter
  • Isop (input-series-output-parallel connected)
  • PCS
  • Zvs (zero voltage switching)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering

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