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Analysis of Allowable Unbalanced Load Conditions for T-Type Three-Level PWM Converter

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  • Kui-Jun Lee

    (Department of Electrical Engineering, Korea National University of Transportation, Chungju 27469, Korea)

Abstract

Since a T-type three-level PWM converter has several advantages in terms of harmonics and conduction loss, it has been widely adopted for various low voltage applications. However, a neutral point voltage control is necessarily required for stable system operation, and an offset voltage can effectively provide the required neutral point current under unbalanced load conditions. Nevertheless, all types of unbalanced loads cannot be accommodated; in other words, there is a limitation on how much unbalanced load conditions can be allowed. Therefore, this paper analyzed the maximum allowable unbalanced load conditions in the T-type three-level PWM converter. This result can be properly utilized for an effective design verification considering unbalanced load conditions as well as a comprehensive approach for the stable system operation. The feasibility of the analytical result is verified through simulation and experimental tests.

Suggested Citation

  • Kui-Jun Lee, 2021. "Analysis of Allowable Unbalanced Load Conditions for T-Type Three-Level PWM Converter," Energies, MDPI, vol. 14(18), pages 1-11, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5969-:d:639524
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    References listed on IDEAS

    as
    1. Kui-Jun Lee, 2020. "Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter," Energies, MDPI, vol. 13(6), pages 1-11, March.
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