Comparison of conventional and improved two-level converter during AC faults

Dimitrios Vozikis, Fahad Alsokhiry, Ahmed Alabdulwahab, Grain Philip Adam

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Abstract

An improved two-level converter (I2LC) is a practical compromise between the conventional two-level converter (C2LC) and modular multilevel converter (MMC), recently proposed for dc transmission system for relatively lower dc voltages and rated powers. The I2LC inherent the ac and dc fault behaviors of the MMC and relative simplicity of C2LC. Therefore, this paper presents a detailed quantitative comparison between the ac and dc responses of the C2LC and I2LC to symmetrical and asymmetrical ac faults. It has been showing that unlike the C2LC, the I2LC provides better controllability than the C2L at system level during asymmetrical ac faults, including two operational objectives simultaneously such as balanced output currents and ripple-free dc-link current. Index Terms—ac and dc faults, two-level converter, improved two-level converter, medium and high-voltage direct current (HVDC) transmission systems.
Original languageEnglish
Number of pages7
Publication statusPublished - 27 Sep 2020
Event9th International Conference on Renewable Energy Research and Applications - Online, Glasgow, United Kingdom
Duration: 27 Sep 202030 Sep 2020

Conference

Conference9th International Conference on Renewable Energy Research and Applications
Abbreviated titleICRERA 2020
CountryUnited Kingdom
CityGlasgow
Period27/09/2030/09/20

Keywords

  • AC faults
  • DC faults
  • two level converter

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    Vozikis, D., Alsokhiry, F., Alabdulwahab, A., & Adam, G. P. (2020). Comparison of conventional and improved two-level converter during AC faults. Paper presented at 9th International Conference on Renewable Energy Research and Applications, Glasgow, United Kingdom.