System-level power loss evaluation of modular multilevel converters

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

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    5 Scopus citations

    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 languageBritish English
    Title of host publication2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages6797-6804
    Number of pages8
    ISBN (Electronic)9781728103952
    DOIs
    StatePublished - Sep 2019
    Event11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019 - Baltimore, United States
    Duration: 29 Sep 20193 Oct 2019

    Publication series

    Name2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019

    Conference

    Conference11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019
    Country/TerritoryUnited States
    CityBaltimore
    Period29/09/193/10/19

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