This work proposes a dc/dc isolated modular multilevel converter (IMMC) with reduced arm and fault blocking capability for a medium-voltage direct current (MVDC) railway electrification system. The proposed IMMC converts the overhead MVDC voltage into the required dc voltage for the traction motor by employing a medium frequency intermediate transformer. The proposed circuit uses only one arm of conventional half-bridge MMC, resulting in a substantial reduction in switch counts compared to conventional half-bridge MMC. The topology, moreover, has inherent fault current blocking capability without any extra circuitry, which helps during dc and ac short-circuit (SC) faults. The impressed voltage on the transformer primary is nearly sinusoidal with little dv/dt. This work includes an analysis of the proposed converter both in steady state and during fault circumstances. A down-scale laboratory prototype and a computer simulation model are used to evaluate the performance of the proposed IMMC.


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    Titel :

    An Isolated Reduced Arm Modular Multilevel Converter With Fault Blocking Capability for MVDC Rail Traction


    Beteiligte:


    Erscheinungsdatum :

    01.02.2025


    Format / Umfang :

    6276686 byte




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch