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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

* ,
 and
School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
* Author to whom correspondence should be addressed.
Received: 19 October 2012 / Revised: 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 (CC BY 3.0).

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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.

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