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A new converter concept for direct connection to the power line of AC-fed traction vehicles will be introduced. This concept contains a new single phase AC/AC-modular-multilevel-converter (M2LC) and a concentrated medium-frequency transformer. A design for multi-system operation will be investigated that can operate on an AC 15 kV/1623 Hz as well as an AC 25 kV/50 Hz power line.The new single phase M2LC, enablingfour quadrant operation, forms the core of this converter concept. The basic characteristics of this new converter will be introduced. Simulations and analytical investigations underline the attractiveness of this new M2LC converter. This versatile traction converter concept stands out due to its modularity, its superior control characteristics as well as its good adaptability to various traction drives. Therefore, the single phase M2LC has the potential to replace the conventional transformer of future AC-fed traction vehicles.
Glinka et al. (Mon,) studied this question.