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An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids

Author

Listed:
  • Xiaolong Shi

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Jiuchun Jiang

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Xintao Guo

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

Abstract

This paper proposes a novel extended-single-phase shift (ESPS) control strategy of isolated bidirectional full-bridge DC-DC converters (IBDCs) which are a promising alternative as a power electronic interface in microgrids with an additional function of galvanic isolation. Based on the mathematical models of ESPS control under steady-state conditions, detailed theoretical and experimental analyses of IBDC under ESPS control are presented. Compared with conventional single-phase-shift (CSPS) control, ESPS control can greatly improve the efficiency of IBDCs in microgrids through decreasing current stress and backflow power considerably over a wide input and output voltage range under light and medium loads. In addition, ESPS control only needs to adjust one single phase-shift angel to control transmission power, thus it retains implementation simplicity in comparison with dual-phase-shift (DPS) control for microgrid applications. Furthermore, an efficiency-optimized modulation scheme based on ESPS and CSPS control is developed in the whole power range of IBDC for power distribution in microgrids. A 10 kW IBDC prototype is constructed and the experimental results validate the effectiveness of the proposed control strategy, showing that the proposed strategy can enhance the overall efficiency up to 30%.

Suggested Citation

  • Xiaolong Shi & Jiuchun Jiang & Xintao Guo, 2012. "An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids," Energies, MDPI, vol. 6(1), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:6:y:2012:i:1:p:27-44:d:22450
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    Citations

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    Cited by:

    1. Chuan Sun & Xiaodong Li, 2018. "Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control," Energies, MDPI, vol. 11(6), pages 1-22, June.
    2. Gao-Yuan Hu & Xiaodong Li & Bo-Yue Luan, 2014. "A Generalized Approach for the Steady-State Analysis of Dual-Bridge Resonant Converters," Energies, MDPI, vol. 7(12), pages 1-21, November.

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