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    A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control

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    Type
    Article
    Authors
    Elserougi, Ahmed
    Abdelsalam, Ibrahim
    Massoud, Ahmed
    Ahmed, Shehab
    KAUST Department
    Electrical Engineering Program
    Upstream Petroleum Engineering Research Center (UPERC)
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Date
    2019-09-13
    Online Publication Date
    2019-09-13
    Print Publication Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/656829
    
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    Abstract
    This paper presents small-signal modeling, stability analysis, and controller design of a nonisolated bidirectional hybrid-modular DC-DC Converter for DC grid applications. The DC-DC converter can be used to interconnect two different DC voltage levels in a medium-/high-voltage DC grid. Half-bridge Sub-Modules (SMs) and a high-voltage valve are the main components of the converter. The high-voltage valve can be implemented via employing series-connected Insulated-Gate Bipolar Transistors (IGBTs). Operation with zero voltage switching of the involved high-voltage valve is feasible, i.e., there is no concern pertinent to dynamic voltage sharing among the series-connected IGBTs. The power is transferred from one side to another through the involved SMs, where their capacitors are connected in series across the high-voltage side, while they are connected sequentially across the low-voltage side. In this paper, the state-space averaging technique is employed to derive the small-signal model of the presented converter for controller design. Closed-form expression of the duty cycle-to-inductor current transfer function is extracted. Comparison between simulation results of the small-signal model and the detailed circuit model is presented to authenticate the accuracy of the derived small-signal model. Finally, a scaled-down prototype is used to verify the accuracy of the small-signal model.
    Citation
    Elserougi, A., Abdelsalam, I., Massoud, A., & Ahmed, S. (2019). A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control. IEEE Access, 7, 132459–132471. doi:10.1109/access.2019.2941249
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Access
    DOI
    10.1109/access.2019.2941249
    Additional Links
    https://ieeexplore.ieee.org/document/8836552/
    ae974a485f413a2113503eed53cd6c53
    10.1109/access.2019.2941249
    Scopus Count
    Collections
    Articles; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC); Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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