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On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

Author

Listed:
  • Zhansen Akhmetov

    (Department of Electrical and Computer Engineering, Nazarbayev University, 010000 Astana, Kazakhstan)

  • Manel Hammami

    (Department of Electrical, Electronic, and Information Engineering, Univ. of Bologna, 40136 Bologna, Italy)

  • Gabriele Grandi

    (Department of Electrical, Electronic, and Information Engineering, Univ. of Bologna, 40136 Bologna, Italy)

  • Alex Ruderman

    (Department of Electrical and Computer Engineering, Nazarbayev University, 010000 Astana, Kazakhstan)

Abstract

Cascade H-bridge (CHB) inverter is an attractive choice for integration of DC sources of different nature, e.g., for distributed generation with energy storage, photovoltaic generation, etc. In general, non-equal DC voltage sources can affect the total harmonic distortion (THD) of the CHB by introducing undesirable low-frequency subharmonics. This paper investigates different level-shifted (LS) and phase-shifted (PS) pulse width modulation (PWM) strategies for single- and three-phase cascade H-bridge inverters with non-equal DC sources from the load current THD minimization perspective. The best current quality is provided by LS PWM, as reported in the literature. The paper provides a simple time domain explanation of LS PWM superiority. However, PS PWM may be a preferable choice for practical applications due to fair power and loss sharing across individual H-bridges. The paper explains how to obtain the best current quality by PS PWM carriers’ order arrangement (DC sources switching sequence selection).

Suggested Citation

  • Zhansen Akhmetov & Manel Hammami & Gabriele Grandi & Alex Ruderman, 2019. "On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources," Energies, MDPI, vol. 12(3), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:441-:d:202061
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    References listed on IDEAS

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    1. Mattia Ricco & Laszlo Mathe & Eric Monmasson & Remus Teodorescu, 2018. "FPGA-Based Implementation of MMC Control Based on Sorting Networks," Energies, MDPI, vol. 11(9), pages 1-18, September.
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    Cited by:

    1. Mauricio Muñoz-Ramírez & Hugo Valderrama-Blavi & Marco Rivera & Carlos Restrepo, 2019. "An Approach to Natural Sampling Using a Digital Sampling Technique for SPWM Multilevel Inverter Modulation," Energies, MDPI, vol. 12(15), pages 1-16, July.
    2. Tiago H. de A. Mateus & José A. Pomilio & Ruben B. Godoy & João O. P. Pinto, 2022. "VSG Control Applied to Seven-Level PV Inverter for Partial Shading Impact Abatement," Energies, MDPI, vol. 15(17), pages 1-14, September.

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