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Energies 2013, 6(1), 27-44; doi:10.3390/en6010027
Article

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

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Received: 19 October 2012; in revised form: 29 November 2012 / Accepted: 14 December 2012 / Published: 24 December 2012
(This article belongs to the Special Issue Smart Grid and the Future Electrical Network)
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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%.
Keywords: isolated bidirectional DC-DC converter; microgrid; energy storage systems; transmission power; backflow power; single-phase-shift control; current stress isolated bidirectional DC-DC converter; microgrid; energy storage systems; transmission power; backflow power; single-phase-shift control; current stress
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Shi, X.; Jiang, J.; Guo, X. An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids. Energies 2013, 6, 27-44.

AMA Style

Shi X, Jiang J, Guo X. An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids. Energies. 2013; 6(1):27-44.

Chicago/Turabian Style

Shi, Xiaolong; Jiang, Jiuchun; Guo, Xintao. 2013. "An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids." Energies 6, no. 1: 27-44.


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