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Multilevel Middle Point Clamped (MMPC) Converter for DC Wind Power Applications

Author

Listed:
  • Awais Karni

    (Department of Electrical and Computer Engineering, North Dakota State University, Fargo, ND 58102, USA)

  • Omid Beik

    (Department of Electrical Engineering, Colorado School of Mines, Golden, CO 80401, USA)

  • Mahzad Gholamian

    (Department of Electrical Engineering, Colorado School of Mines, Golden, CO 80401, USA)

  • Mahdi Homaeinezhad

    (Department of Electrical Engineering, Colorado School of Mines, Golden, CO 80401, USA)

  • Muhammad Owais Manzoor

    (Department of Electrical and Computer Engineering, North Dakota State University, Fargo, ND 58102, USA)

Abstract

This manuscript introduces a novel multilevel middle point clamped (MMPC) DC-DC converter and its associated switching scheme aimed at maintaining the desired medium-voltage DC (MVDC) collector grid within offshore all-DC wind farms. Building upon previous work by the authors, which proposed an all-DC structure serving as a benchmark system, this study explores the application of the MMPC DC-DC converter within this framework. Within the all-DC wind generation system, a 9-phase hybrid generator (HG) integrated into the wind turbine is linked to the MVDC collector grid through an AC-DC stage, which is a passive rectifier. This passive rectifier offers elevated voltage ratings and protection against back power flow. The conventional neutral point clamped (NPC) converter concept has been thoroughly investigated and expanded upon to develop the proposed MMPC DC-DC converter. The proposed MMPC DC-DC converter integrates boosting capabilities, facilitating the connection of the generator’s rectified voltage to the MVDC collector grid while regulating variable rectified voltage to a fixed MVDC collector grid voltage. The MVDC collector grid is further interconnected with high-voltage DC (HVDC) through a DC-DC converter situated in an offshore substation. This paper further provides a comprehensive overview of the proposed MMPC DC-DC converter, detailing its operational modes and corresponding switching schemes. Through an in-depth examination of operational modes, duty cycles for each switch and mode are defined, subsequently establishing the relationship between rectified input voltage and MVDC output voltage for the MMPC DC-DC converter. Utilizing the middle point clamped architecture, this innovative converter offers several advantages, including low ripple voltage, a modular structure, and reduced switching stress because of the multilevel voltage and the incorporation of a hard point, which also facilitates the capacitor voltage balancing. Finally, the effectiveness of the proposed converter is evaluated via simulation studies of a wind turbine conversion system utilizing two cascaded MMPC DC-DC converters operating under variable input voltage conditions. The simulations confirm its efficacy, supported by promising results, and validating its performance.

Suggested Citation

  • Awais Karni & Omid Beik & Mahzad Gholamian & Mahdi Homaeinezhad & Muhammad Owais Manzoor, 2024. "Multilevel Middle Point Clamped (MMPC) Converter for DC Wind Power Applications," Sustainability, MDPI, vol. 16(17), pages 1-18, September.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:17:p:7563-:d:1468843
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    References listed on IDEAS

    as
    1. M. A. Hannan & Ali Q. Al-Shetwi & M. S. Mollik & Pin Jern Ker & M. Mannan & M. Mansor & Hussein M. K. Al-Masri & T. M. Indra Mahlia, 2023. "Wind Energy Conversions, Controls, and Applications: A Review for Sustainable Technologies and Directions," Sustainability, MDPI, vol. 15(5), pages 1-30, February.
    2. Kalair, A. & Abas, N. & Khan, N., 2016. "Comparative study of HVAC and HVDC transmission systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 1653-1675.
    3. Lucky Dube & Graham C. Garner & Karen S. Garner & Maarten J. Kamper, 2023. "Simple and Robust MPPT Current Control of a Wound Rotor Synchronous Wind Generator," Energies, MDPI, vol. 16(7), pages 1-21, April.
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