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Selective Harmonic Elimination Technique for a 27-Level Asymmetric Multilevel Converter

Author

Listed:
  • Ignacio Torres

    (Engineering PhD Program, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo, NSW 2007, Australia
    Faculty of Engineering, University of Talca, Curicó 3340000, Chile)

  • Javier Muñoz

    (Faculty of Engineering, University of Talca, Curicó 3340000, Chile)

  • Diego Rojas

    (Engineering Systems Doctoral Program, Faculty of Engineering, University of Talca, Curicó 3340000, Chile)

  • Eduardo E. Espinosa

    (Department of Electrical Engineering, Faculty of Engineering, Universidad Católica de la Santísima Concepción, Concepción 4090541, Chile)

Abstract

In this paper, we present an implementation of selective harmonic elimination modulation technique in a 27-Level asymmetric multilevel converter. The main issue in this kind of converters is the generation of the gating patterns to obtain an optimized AC voltage waveform. State-of-the art solutions use deep mathematical analysis in the frequency domain by means of the Fourier series, but they are mainly applied for two-level or symmetric multilevel converters. On the other hand, the modulation for asymmetric multilevel converters is mainly focused on nearest level control or nearest vector control. In this work, we propose a novel modulating technique that takes advantage of the switching angles optimization for a 27-level waveform. In fact, different set of solutions are obtained and presented in order to define the modulation index as well as the value of the switching angles for the multilevel waveform. A modulation index sweep was performed for the entire operating region of the converter, where it can be observed that the number of levels decreases when the modulation index is low, which are calculated in order to minimize the total harmonic distortion (THD) of the resulting voltage waveform. In order to validate the proposal, these results for different modulation indexes values are simulated, obtaining a THD < 5% for a modulation index 0.75 < M < 1.0 . Finally, a small scale proof-of-concept prototype is implemented in order to validate the proposal.

Suggested Citation

  • Ignacio Torres & Javier Muñoz & Diego Rojas & Eduardo E. Espinosa, 2022. "Selective Harmonic Elimination Technique for a 27-Level Asymmetric Multilevel Converter," Energies, MDPI, vol. 15(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3694-:d:818306
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    References listed on IDEAS

    as
    1. Mohammad Ali Dashtaki & Hamed Nafisi & Amir Khorsandi & Mojgan Hojabri & Edris Pouresmaeil, 2021. "Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study," Energies, MDPI, vol. 14(4), pages 1-20, February.
    2. Jagabar Sathik & Shady H. E. Abdel Aleem & Rasoul Shalchi Alishah & Dhafer Almakhles & Kent Bertilsson & Mahajan Sagar Bhaskar & George Fernandez Savier & Karthikeyan Dhandapani, 2021. "A Multilevel Inverter Topology Using Diode Half-Bridge Circuit with Reduced Power Component," Energies, MDPI, vol. 14(21), pages 1-21, November.
    3. Patricio Gaisse & Javier Muñoz & Ariel Villalón & Rodrigo Aliaga, 2020. "Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy," Sustainability, MDPI, vol. 12(15), pages 1-22, August.
    Full references (including those not matched with items on IDEAS)

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