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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    Title :

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


    Contributors:


    Publication date :

    2025-02-01


    Size :

    6276686 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English