The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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High-Efficiency DC-DC Converter with Improved Dynamic Response Characteristics for Modular Photovoltaic Power Conversion

모듈형 태양광 발전을 위한 개선된 동적응답 특성을 지닌 고효율 DC-DC 컨버터

  • Choi, Jae-Yeon (Division of Electronic Engineering, Chonbuk Nat'l Univ.) ;
  • Choi, Woo-Young (Division of Electronic Engineering, Chonbuk Nat'l Univ.)
  • Received : 2012.09.04
  • Accepted : 2012.12.04
  • Published : 2013.02.20
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Abstract

This paper proposes a high-efficiency DC-DC converter with improved dynamic response characteristics for modular photovoltaic power conversion. High power efficiency is achieved by reducing switching power losses of the DC-DC converter. The voltage stress of power switches is reduced at primary side. Zero-current switching of output diodes is achieved at secondary side. A modified proportional and integral controller is suggested to improve the dynamic responses of the DC-DC converter. The performance of the proposed converter is verified based on a 200 [W] modular power conversion system including the grid-tied DC-AC inverter. The proposed DC-DC converter achieves the efficiency of 97.9 % at 60 [V] input voltage for a 200 [W] output power. The overall system including DC-DC converter and DC-AC inverter achieves the efficiency of 93.0 % when 200 [W] power is supplied into the grid.

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References

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