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A novel modulation method for half-bridge based modular multilevel converter under submodule failure with reduced switching frequency
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Publication Year
2019-05-24
Journal
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Publisher
Institute of Electrical and Electronics Engineers Inc.
Citation
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Vol.2019-March, pp.620-624
Keyword
DC distributionFault-toleranceModular multilevel converter (MMC)Neutral-shiftReliability
Mesh Keyword
Capacitor voltagesDc distributionFault-tolerant methodFundamental periodModular multi-level convertersNeutral shiftSimulation studiesSorting algorithm
All Science Classification Codes (ASJC)
Electrical and Electronic Engineering
Abstract
This paper proposes a novel modulation method for half-bridge submodule (SM) based modular multilevel converter (MMC) under faulty SM condition. When a SM is failed, the proper healthy SM is selected and the faulty SM is replaced by the healthy SM in the proposed fault-tolerant method. By replacing the faulty SM, the MMC continues its operation as the normal mode. The SM selection is implemented by a novel modulation method and it reduces the switching frequency of all healthy SMs, which is the serious drawback of the conventional sorting algorithm. The neutral-shift method is applied in order to maintain the balanced three-phase line-to-line voltages during a fundamental period. Various simulation studies verify that this post-fault strategy guarantees the balanced three-phase line-to-line voltages and currents as well as balancing of SM capacitor voltages without the aid of extra SMs.
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/36418
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85067101752&origin=inward
DOI
https://doi.org/10.1109/apec.2019.8722287
Type
Conference
Funding
This research was supported by the KEPCO Research Institute under the project entitled by \u201cDesign of analysis model and optimal voltage for MVDC distribution system (R17DA10)\u201d
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Lee, Kyo-Beum이교범
Department of Electrical and Computer Engineering
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