AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences

Heng Wu, Xiongfei Wang, Lukasz Kocewiak, Lennart Harnefors

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

9 Citations (Scopus)

Abstract

This paper presents a small-signal model for modular multilevel converters (MMCs) by using the harmonic state space (HSS) method. The ac output impedance of the MMC is then derived and compared with that of the commonly used two-level voltage-source converters (TL-VSCs). It turns out that the low frequency ac impedance of the MMC differs from that of the TL-VSC, due to the influences of internal dynamics, especially for the open-loop control and the voltage-mode control. In contrast, for the current-mode control, this difference can be minimized by the current regulator with a high-gain in the low frequency range. Moreover, despite the used control schemes, the high frequency ac impedance of the MMC is similar to that of the TL-VSC. The time-domain simulations are provided to validate the effectiveness of the theoretical analysis.
Original languageEnglish
Title of host publicationProceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)
Number of pages8
PublisherIEEE Press
Publication date10 Sep 2018
Pages1-8
Article number8459952
ISBN (Print)978-1-5386-5542-9
ISBN (Electronic)978-1-5386-5541-2
DOIs
Publication statusPublished - 10 Sep 2018
Event19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 - Padova, Italy
Duration: 25 Jun 201828 Jun 2018

Conference

Conference19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
CountryItaly
CityPadova
Period25/06/201828/06/2018

Keywords

  • modular multilevel converter
  • small-signal model
  • harmonic state space
  • impedance modeling

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    Wu, H., Wang, X., Kocewiak, L., & Harnefors, L. (2018). AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences. In Proceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL) (pp. 1-8). [8459952] IEEE Press. https://doi.org/10.1109/COMPEL.2018.8459952