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Modeling and Mitigation Control of the Submodule-Capacitor Voltage Ripple of a Modular Multilevel Converter under Unbalanced Grid Conditions

Author

Listed:
  • Songda Wang

    (Department of Energy Technology, Aalborg University, 9220 Aalborg East, Denmark)

  • Danyang Bao

    (Shenzhen Polytechnic, Xili University Town, Shenzhen 518055, China)

  • Gustavo Gontijo

    (Department of Energy Technology, Aalborg University, 9220 Aalborg East, Denmark)

  • Sanjay Chaudhary

    (Department of Energy Technology, Aalborg University, 9220 Aalborg East, Denmark)

  • Remus Teodorescu

    (Department of Energy Technology, Aalborg University, 9220 Aalborg East, Denmark)

Abstract

A modular multilevel converter’s (MMC’s) submodule (SM)-capacitor voltage will increase under unbalanced grid conditions. Depending on the imbalance level, the voltage ripple can be considerably high, and it can exceed the pre-defined safe limits. If this occurs, the converter will trip, which can lead to serious stability problems for the grid. This paper first proposes an analytical solution for deriving the three-phase imbalanced SM ripple of an MMC under an unbalanced grid. With this analytical tool, the imbalance mechanism of the SM voltage ripple can be easily understood. What is more, the symmetrical component method is first applied to analyze the three-phase SM capacitor ripple, and the positive-/negative-/zero-sequence components of the three-phase SM voltage ripple are easily identified by the proposed analytical method. Then, based on this powerful analytical tool, the proper circulating-current profile to be injected can be obtained, allowing for the right compensation of the voltage ripple. Based on this approach, two new voltage ripple compensation methods are proposed in this paper. Simulations were carried out to validate the analytical description of the submodule-capacitor voltage ripple proposed in this paper. Moreover, simulation and experimental results are provided to validate the new compensation techniques introduced in this paper.

Suggested Citation

  • Songda Wang & Danyang Bao & Gustavo Gontijo & Sanjay Chaudhary & Remus Teodorescu, 2021. "Modeling and Mitigation Control of the Submodule-Capacitor Voltage Ripple of a Modular Multilevel Converter under Unbalanced Grid Conditions," Energies, MDPI, vol. 14(3), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:651-:d:488704
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    References listed on IDEAS

    as
    1. Gustavo Gontijo & Songda Wang & Tamas Kerekes & Remus Teodorescu, 2020. "New AC–AC Modular Multilevel Converter Solution for Medium-Voltage Machine-Drive Applications: Modular Multilevel Series Converter," Energies, MDPI, vol. 13(14), pages 1-48, July.
    2. Shuren Wang & Fahad Saeed Alsokhiry & Grain Philip Adam, 2020. "Impact of Submodule Faults on the Performance of Modular Multilevel Converters," Energies, MDPI, vol. 13(16), pages 1-18, August.
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    Cited by:

    1. Jahangeer Badar Soomro & Faheem Akhtar Chachar & Madad Ali Shah & Abdul Aziz Memon & Faisal Alsaif & Sager Alsulamy, 2023. "Optimized Circulating Current Control and Enhanced AC Fault Ride-through Capability Using Model Predictive Control for MMC-HVDC Applications," Energies, MDPI, vol. 16(13), pages 1-19, July.
    2. Mohammad Alathamneh & Haneen Ghanayem & Xingyu Yang & R. M. Nelms, 2022. "Three-Phase Grid-Connected Inverter Power Control under Unbalanced Grid Conditions Using a Time-Domain Symmetrical Components Extraction Method," Energies, MDPI, vol. 15(19), pages 1-16, September.
    3. Mohammad Alathamneh & Haneen Ghanayem & Xingyu Yang & R. M. Nelms, 2022. "Three-Phase Grid-Connected Inverter Power Control under Unbalanced Grid Conditions Using a Proportional-Resonant Control Method," Energies, MDPI, vol. 15(19), pages 1-17, September.
    4. Mohammad Alathamneh & Haneen Ghanayem & R. M. Nelms, 2022. "Bidirectional Power Control for a Three-Phase Grid-Connected Inverter under Unbalanced Grid Conditions Using a Proportional-Resonant and a Modified Time-Domain Symmetrical Components Extraction Method," Energies, MDPI, vol. 15(24), pages 1-23, December.
    5. Bane Popadic & Boris Dumnic & Dragan Milicevic & Luka Strezoski & Natasa Petrovic, 2021. "Sub-Transient Response of the DSC Controlled Inverter under Fault," Energies, MDPI, vol. 14(16), pages 1-18, August.
    6. Jahangeer Badar Soomro & Dileep Kumar & Faheem Akhtar Chachar & Semih Isik & Mohammed Alharbi, 2023. "An Enhanced AC Fault Ride through Scheme for Offshore Wind-Based MMC-HVDC System," Sustainability, MDPI, vol. 15(11), pages 1-16, June.
    7. Davide del Giudice & Federico Bizzarri & Samuele Grillo & Daniele Linaro & Angelo Maurizio Brambilla, 2022. "Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids," Energies, MDPI, vol. 15(17), pages 1-23, August.

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