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Single-Stage MV-Connected Charger Using an Ac/Ac Modular Multilevel Converter

Author

Listed:
  • Ygor Pereira Marca

    (Electromechanics and Power Electronics Group, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands)

  • Maurice G. L. Roes

    (Electromechanics and Power Electronics Group, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands)

  • Cornelis G. E. Wijnands

    (Electromechanics and Power Electronics Group, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands)

  • Jorge L. Duarte

    (Electromechanics and Power Electronics Group, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands)

  • Henk Huisman

    (Electromechanics and Power Electronics Group, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands)

Abstract

Modular multilevel converters with non-sinusoidal ac voltage output can reduce cost and volume in medium-voltage-connected electric vehicle battery charging applications. The use of full-bridge submodules in such converters enables single-stage ac/ac voltage conversion, allowing a medium-voltage grid to be directly connected to a medium-frequency isolation transformer. The application of a square wave voltage at the medium-frequency transformer’s single-phase port enhances the converter’s efficiency and power density in comparison to a sinusoidal voltage. This paper presents the analysis and modelling of a modular multilevel converter, comparing its operation with sinusoidal and square wave output voltages. A single control scheme for both output voltage waveforms is proposed for the three-phase and single-phase ac currents, circulating currents, and the energy stored in the submodule capacitors. The control strategy of the three-phase and single-phase port currents is verified through simulation and experiments using a scaled-down prototype, thereby validating its suitability for high-power bidirectional battery chargers.

Suggested Citation

  • Ygor Pereira Marca & Maurice G. L. Roes & Cornelis G. E. Wijnands & Jorge L. Duarte & Henk Huisman, 2024. "Single-Stage MV-Connected Charger Using an Ac/Ac Modular Multilevel Converter," Energies, MDPI, vol. 17(12), pages 1-23, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:12:p:2998-:d:1417122
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