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A Novel Multilevel DC-Link Three-Phase T-Type Inverter

Author

Listed:
  • Saddam Shueai Alnamer

    (Institute of Power Engineering, Universiti Tenaga Nasional, Kajang 43000, Selangor, Malaysia)

  • Saad Mekhilef

    (Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
    School of Software and Electrical Engineering, Swinburne, Victoria 3122, Australia
    Center of Research Excellence in Renewable Energy and Power Systems, King Abdulaziz University, Jeddah 21589, Saudi Arabia)

  • Hazlie Mokhlis

    (Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

  • Nadia M. L. Tan

    (Department of Electrical and Electronics Engineering, College of Engineering, Universiti Tenaga Nasional, Kajang 43000, Selangor, Malaysia)

Abstract

This research proposes a four-level T-type inverter that is suitable for low-power applications. The presented topology outranks other types of inverters in terms of a smaller number of semiconductor devices, absence of passive components such as clamping diodes and flying capacitors, low switching and conduction losses, and high efficiency. The proposed topology is free from voltage deviation and unbalanced voltage occurrences that are present in other multilevel converters having clamping diodes or flying capacitors. The proposed inverter can extend to N levels using unequal dc-link voltage sources for medium-voltage application. The inverter employs the simple fundamental frequency staircase modulation technique. Moreover, this paper presents a current commutation strategy to prevent the occurrences of short circuit and minimizing the number of required switching devices and switching transitions, resulting in improving the efficiency of the inverter. This paper also analyses the theoretical converter losses showing lower switching and conduction losses when compared to existing four-level inverters. The experimental validation of the proposed inverter shows its operating feasibility and a low output voltage THD.

Suggested Citation

  • Saddam Shueai Alnamer & Saad Mekhilef & Hazlie Mokhlis & Nadia M. L. Tan, 2020. "A Novel Multilevel DC-Link Three-Phase T-Type Inverter," Energies, MDPI, vol. 13(16), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:16:p:4186-:d:398471
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    References listed on IDEAS

    as
    1. Muhyaddin Rawa & Marif Daula Siddique & Saad Mekhilef & Noraisyah Mohamed Shah & Hussain Bassi & Mehdi Seyedmahmoudian & Ben Horan & Alex Stojcevski, 2019. "Design and Implementation of a Hybrid Single T-Type Double H-Bridge Multilevel Inverter (STDH-MLI) Topology," Energies, MDPI, vol. 12(9), pages 1-15, May.
    2. Saddam Shueai Alnamer & Saad Mekhilef & Hazlie Bin Mokhlis, 2018. "A Four-Level T-Type Neutral Point Piloted Inverter for Solar Energy Applications," Energies, MDPI, vol. 11(6), pages 1-14, June.
    3. Azuwien Aida Bohari & Hui Hwang Goh & Agustiono Kurniawan Tonni & Sze Sing Lee & Sy Yi Sim & Kai Chen Goh & Chee Shen Lim & Yi Chen Luo, 2020. "Predictive Direct Power Control for Dual-Active-Bridge Multilevel Inverter Based on Conservative Power Theory," Energies, MDPI, vol. 13(11), pages 1-14, June.
    Full references (including those not matched with items on IDEAS)

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