Partial Parallel Dual Active Bridge Converter with Variable Voltage Gain for SOEC/SOFC System

Yudi Xiao, Zhe Zhang, Michael A. E. Andersen, Brian Engelbrecht Thomsen

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    Abstract

    Fuel cells are becoming one of the promising devices in distributed generation (DG) systems due to their modularity, low or zero pollution and dispatchability. As one of the fuel cell technologies, solid oxide electrolysis cell / solid oxide fuel cell (SOEC/SOFC) has gained more and more attention owing to their relatively high efficiency. However, design of the interface system for SOEC/SOFC is challenging because of the current-dependent and low stack voltage, the slow cell dynamics
    and transient response, and the asymmetrical power characteristic of SOEC/SOFC. In this paper, a self-circulating modulation (SCM) is proposed for the partial parallel dual active bridge (P2DAB) converter. The SCM makes the voltage gain of the P2DAB converter variable, given the inherent high voltage gain characteristics of the topology itself, the P2DAB converter with SCM can thereby address the current-dependent and low stack voltage issues of SOEC/SOFC. Moreover, by using a SOFC-Parallel-SOEC-Series interface architecture, the asymmetrical power characteristics of SOEC/SOFC do not degrade the efficiency of the P2DAB converter. Finally, the analysis of the proposed SCM is verified on a 1MHz, 500W, 400V/50V, GaN-based P2DAB converter.
    Original languageEnglish
    Title of host publicationProceedings of 34th annual IEEE Applied Power Electronics Conference and Exposition
    Number of pages6
    PublisherIEEE
    Publication date2019
    Pages1641-1646
    ISBN (Print)978-1-5386-8330-9
    DOIs
    Publication statusPublished - 2019
    Event2019 IEEE Applied Power Electronics Conference and Exposition - Anaheim convention center, Anaheim, United States
    Duration: 17 Mar 201921 Mar 2019
    https://ieeexplore.ieee.org/xpl/conhome/8716496/proceeding

    Conference

    Conference2019 IEEE Applied Power Electronics Conference and Exposition
    LocationAnaheim convention center
    Country/TerritoryUnited States
    CityAnaheim
    Period17/03/201921/03/2019
    Internet address

    Keywords

    • Reversible fuel cells
    • Power converter
    • Dual active bridge
    • GaN

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