Hybrid Modular Multilevel Converters for High-AC/Low-DC Medium-Voltage Applications

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dc.contributor.authorMotwani, Jayesh Kumaren
dc.contributor.authorLiu, Jianen
dc.contributor.authorBoroyevich, Dushanen
dc.contributor.authorBurgos, Rolandoen
dc.contributor.authorZhou, Zhien
dc.contributor.authorDong, Dongen
dc.date.accessioned2024-03-06T15:49:29Zen
dc.date.available2024-03-06T15:49:29Zen
dc.date.issued2024-02-12en
dc.description.abstractWith ever-increasing power-density requirements, technologies such as energy storage systems and electric-vehicles can benefit greatly from interfacing medium-voltage (MV)-AC grid like 13.8kV or 30kV using high-AC/low-DC voltage converter. Using modular high-AC/low-DC voltage converter can help increase power-density and efficiency, while reducing total conversion steps and providing flexibility. Full-bridge modular multilevel converters (FB-MMC) and solid-state transformers are existing solutions for such operations, but suffer from limitations of high semiconductor requirements, large submodule capacitors and/or many high-frequency transformers. Three new hybrid-MMC (HMMC) topologies are proposed in this paper as alternative solutions for such high-AC/low-DC voltage operations. Each of the three developed HMMCs utilizes a unique combination of low-frequency high-voltage switches and fast-switching lowvoltage switch based submodules to generate multilevel-AC voltage. HMMCs are compared extensively to state-of-the-art FB-MMC and are shown to have semiconductor savings of over 27%, 38% lower submodule capacitor size, and 53% lower losses for 13.8-kV-AC/6-kV-DC operation. Due to these benefits like higher efficiency, significantly smaller submodule capacitance requirements, and fewer semiconductors, HMMCs can be an excellent option for high-AC/low-DC applications. Practical considerations like snubber and DC split-capacitor requirement are also elaborated for developing and commercializing HMMCs. Comparison results are verified using a 17.5 kW three-phase MV laboratory prototype.en
dc.description.versionPublished versionen
dc.format.extentPages 1-15en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1109/tpel.2024.3361908en
dc.identifier.eissn1941-0107en
dc.identifier.issn0885-8993en
dc.identifier.issue99en
dc.identifier.orcidBurgos, Rolando [0000-0003-0570-2768]en
dc.identifier.orcidBoroyevich, Dushan [0000-0001-9538-4980]en
dc.identifier.orcidDong, Dong [0000-0002-7236-3439]en
dc.identifier.urihttps://hdl.handle.net/10919/118284en
dc.identifier.volumePPen
dc.language.isoenen
dc.publisherIEEEen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectHybrid modular multilevel convertersen
dc.subjectmodular multilevel convertersen
dc.subjectmedium voltage converteren
dc.subjectelectric vehicle chargersen
dc.subjectenergy storage systemsen
dc.subjectsolid state transformeren
dc.titleHybrid Modular Multilevel Converters for High-AC/Low-DC Medium-Voltage Applicationsen
dc.title.serialIEEE Transactions on Power Electronicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Electrical and Computer Engineeringen
pubs.organisational-group/Virginia Tech/University Distinguished Professorsen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

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