Condition Monitoring for Capacitors in Modular Multilevel Converter based on High-frequency Transient Analysis

Hongjian Xia, Yi Zhang, Huai Wang, Minyou Chen, Wei Lai, Dan Luo, Yulong Hu

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

    3 Scopus citations

    Abstract

    Condition monitoring (CM) methods applied for power electronics can provide effective information for predictive maintenance and prevent unexpected system downtime. This paper proposes a non-invasive and in-situ CM method for capacitors in modular multilevel converters. Unlike the conventional methods that monitor low-frequency signals, the proposed method focuses on high-frequency transient analysis. By analyzing the transient voltage at the capacitor's charging moment with wavelet decomposition, the proposed method can estimate the capacitor's equivalent series resistance in situ. Moreover, the proposed method based on high-frequency transients is decoupled from system operating states, while the conventional low-frequency signals are often affected by operations (e.g., loads, environments, etc.). Finally, the effectiveness of the proposed method has been validated in a 14kW case study by simulation.

    Original languageBritish English
    Title of host publication2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages5342-5347
    Number of pages6
    ISBN (Electronic)9781728151359
    DOIs
    StatePublished - 2021
    Event13th IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Virtual, Online, Canada
    Duration: 10 Oct 202114 Oct 2021

    Publication series

    Name2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings

    Conference

    Conference13th IEEE Energy Conversion Congress and Exposition, ECCE 2021
    Country/TerritoryCanada
    CityVirtual, Online
    Period10/10/2114/10/21

    Keywords

    • capacitor
    • condition monitoring
    • equivalent series resistance (ESR)
    • modular multilevel converter (MMC)

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