Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Input-Series-Output-Parallel Connected DC/DC Converter for a Photovoltaic PCS with High Efficiency under a Wide Load Range

  • Lee, Jong-Pil (Power Conversion & System for Renewable Energy Research Center, KERI) ;
  • Min, Byung-Duk (Power Conversion & System for Renewable Energy Research Center, KERI) ;
  • Kim, Tae-Jin (Power Conversion & System for Renewable Energy Research Center, KERI) ;
  • Yoo, Dong-Wook (Power Conversion & System for Renewable Energy Research Center, KERI) ;
  • Yoo, Ji-Yoon (School of Electrical Engineering, The University of the Korea)
  • Published : 2010.01.20
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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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References

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