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Analysis of Asymmetric Hybrid Modular Multilevel Topology for Medium-Voltage Front-End Converter Applications

Author

Listed:
  • Muhammad Ali

    (Department of Electrical Engineering, University of Engineering and Technology, Mardan 23200, Pakistan)

  • Ajmal Farooq

    (Department of Electrical Engineering, University of Engineering and Technology, Mardan 23200, Pakistan)

  • Muhammad Qasim Khan

    (Department of Electrical Engineering, SEIEE, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Muhammad Mansoor Khan

    (Department of Electrical Engineering, SEIEE, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Lucian Mihet-Popa

    (Faculty of Electrical Engineering, Ostfold University College, 1757 Halden, Norway)

Abstract

Modular multilevel converters (MMCs) have been conceived as an alternative in front-end converter applications to enhance the converter system’s reliability, minimize total harmonic distortion, and improve power quality. These converters utilize several DC-link capacitors and power electronic switches, along with switches operating with high switching frequencies, to attain the desired characteristics. Thereby, this paper systematically proposes a novel three-phase asymmetric hybrid modular multilevel converter (AHMMC) for front-end converters used in lower-medium-voltage applications. The AHMMC configuration is based on a three-phase converter connected to a per-phase series arrangement with a cascaded converter module (CCM). The study investigates the AHMMC and proposes a control scheme, which minimizes the voltage range on switches and maintains the current to its reference value. Furthermore, the study also introduces an active balancing of voltage across DC-link capacitors based on the phase opposition disposition PWM (POD-PWM) method. Our new configuration has features such as low switching loss, reduced DC-link voltage, a wider modulation range for the unity power factor (PF), and low voltage and current harmonic distortion. The simulation results are added to verify the performance of the new AHMMC topology and the usefulness of the modular control scheme. In addition, a low-voltage laboratory prototype based on customized control and power boards is built to validate the proposed converter and its control scheme in practice.

Suggested Citation

  • Muhammad Ali & Ajmal Farooq & Muhammad Qasim Khan & Muhammad Mansoor Khan & Lucian Mihet-Popa, 2023. "Analysis of Asymmetric Hybrid Modular Multilevel Topology for Medium-Voltage Front-End Converter Applications," Energies, MDPI, vol. 16(4), pages 1-22, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:1572-:d:1057882
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    References listed on IDEAS

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    1. Hossein Khoun Jahan & Reyhaneh Eskandari & Tohid Rahimi & Rasoul Shalchi Alishah & Lei Ding & Kent Bertilsson & Mehran Sabahi & Frede Blaabjerg, 2021. "A Limited Common-Mode Current Switched-Capacitor Multilevel Inverter Topology and Its Performance and Lifetime Evaluation in Grid-Connected Photovoltaic Applications," Energies, MDPI, vol. 14(7), pages 1-18, March.
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