DC Link Capacity Enhancement for MMC-based Distribution Link using Dynamic Voltage Operation

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Abstract

When operating a modular multilevel converter (MMC), a margin appears between the arm voltage and sum capacitor voltage corresponding to the power dependent ripple. This margin can be used to enhance the DC link voltage and increase the transfer capacity of an MMC-based distribution link while keeping the submodule (SM) stresses fixed. Consequently, this dynamic enhancement in transfer capacity can be achieved with the same submodule switch and capacitor voltage ratings. Using an arm-level averaged simulation model of a 10MW MMC-based MVDC link, the enhancement concept is verified and shown to be beneficial to a practical link application. Besides, a dependency is discovered between the enhancement limit and the grid-injected reactive power, which defines the basis of the proposed control for dynamic enhanced operation.
Original languageEnglish
Title of host publicationProceedings of the 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)
PublisherIEEE
Pages636-642
Number of pages7
ISBN (Electronic)978-89-5708-350-5
ISBN (Print)979-8-3503-3620-7
DOIs
Publication statusPublished - 2023
Event2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia) - Jeju Island, Korea, Republic of
Duration: 22 May 202325 May 2023
Conference number: 11th

Conference

Conference2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)
Country/TerritoryKorea, Republic of
CityJeju Island
Period22/05/2325/05/23

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Power electronic converter
  • Distribution link
  • Modular multilevel converter
  • Power systems

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