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A compact MMC submodule structure with reduced capacitor size using the stacked switched capacitor architecture
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Tang, Yuan, Chen, Minjie and Ran, Li (2016) A compact MMC submodule structure with reduced capacitor size using the stacked switched capacitor architecture. IEEE Transactions on Power Electronics, 31 (10). pp. 6920-6936. doi:10.1109/TPEL.2015.2511189 ISSN 0885-8993.
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Official URL: http://dx.doi.org/10.1109/TPEL.2015.2511189
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 system. In current MMC submodule designs, the reservoir capacitor usually accounts for over 50% of the total volume and 80% of weight. This paper presents a new design concept and control principle for a submodule using the stacked switched capacitor (SSC) architecture that can significantly reduce the capacitor size in an MMC. Practical considerations for a high-voltage high-power SSC-based MMC SM are presented in this paper, through the design of a 21-level, 40 kV (pole-pole dc), 19.1 MW, gridconnected system, and the concept is demonstrated experimenttally on a scaled-down 400 V, 12.3 Apeak laboratory prototype submodule. 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 the power loss.
Item Type: | Journal Article | ||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Journal or Publication Title: | IEEE Transactions on Power Electronics | ||||||||
Publisher: | IEEE | ||||||||
ISSN: | 0885-8993 | ||||||||
Official Date: | October 2016 | ||||||||
Dates: |
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Volume: | 31 | ||||||||
Number: | 10 | ||||||||
Page Range: | pp. 6920-6936 | ||||||||
DOI: | 10.1109/TPEL.2015.2511189 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 8 January 2016 |
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