System-Level Power Loss Evaluation of Modular Multilevel Converters

Yi Zhang, Huai Wang, Zhongxu Wang, Frede Blaabjerg, Maryam Saeedifard

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)
66 Downloads (Pure)

Abstract

For modular multilevel converters (MMCs), reducing the design margin while fulfilling the reliability target in the design stage is challenging. To address this challenge, a system-level power loss evaluation is essential. Although many studies have discussed the power loss calculation of the MMC, most of them focus on the power losses of semiconductor devices while ignoring the impact of capacitors, arm inductors, and ac transformers. Therefore, this paper proposes a system-level power loss evaluation for MMCs from the perspective of reliability assessment. The power loss model covers switching devices, capacitors, and inductors. All the power loss calculation is starting from the active/reactive-power set points of the converter at the point of common coupling (PCC), where the converter is connected to the AC grid. The leakage inductance of the ac transformer is also considered. In addition, in order to meet the needs of long-term reliability assessment, the proposed power loss calculation is computation-efficient and easy to update parameters. The theoretical analysis has been verified by a full-scale MMC in simulations and a down-scale platform by experiments.
Original languageEnglish
Title of host publication2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
Number of pages8
PublisherIEEE Press
Publication dateSep 2019
Pages6797-6804
Article number8913051
ISBN (Electronic)9781728103952
DOIs
Publication statusPublished - Sep 2019
Event11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019 - Baltimore, United States
Duration: 29 Sep 20193 Oct 2019

Conference

Conference11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019
Country/TerritoryUnited States
CityBaltimore
Period29/09/201903/10/2019
SponsorIEEE Industry Application Society (IAS), IEEE Power Electronics Society (PELS)
SeriesIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

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