Design and control of a compact MMC submodule structure with reduced capacitor size using the stacked switched capacitor architecture

Yuan Tang, Minjie Chen, Li Ran

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Modular multilevel converters (MMCs) are being developed for the grid connection of offshore wind or tidal farms. In order to reduce the construction and maintenance costs, it is desirable to reduce the weight and volume of the MMC systems. In most existing MMC submodule designs, the reservoir capacitor usually accounts for over 50% of the total volume and 80% of the total weight. This paper presents a new circuit topology and control principle for a submodule based on a stacked switched capacitor (SSC) architecture that can significantly reduce the capacitor size in an MMC. Practical considerations for a high-voltage high-power system implementation are presented in this paper through the design and simulation of a 21-level, 40 kV (pole-pole dc), 19.1 MW, grid-connected MMC system. The proposed MMC submodule design is further verified experimentally on a scaled down 400 V, 12.3 Apeak laboratory prototype. It is shown that with the proposed SSC-architecture, the total volume of capacitors in each submodule can be reduced by more than 40% without significantly increasing power losses.

Original languageEnglish (US)
Title of host publication2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1443-1449
Number of pages7
ISBN (Electronic)9781467383936
DOIs
StatePublished - May 10 2016
Externally publishedYes
Event31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016 - Long Beach, United States
Duration: Mar 20 2016Mar 24 2016

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2016-May

Other

Other31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
CountryUnited States
CityLong Beach
Period3/20/163/24/16

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • ac-dc power conversion
  • energy storage
  • modular multilevel converter
  • submodule
  • switched capacitor circuits

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    Tang, Y., Chen, M., & Ran, L. (2016). Design and control of a compact MMC submodule structure with reduced capacitor size using the stacked switched capacitor architecture. In 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016 (pp. 1443-1449). [7468058] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; Vol. 2016-May). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2016.7468058