Dynamic Analysis of a Modular Multilevel Converter Based VSCHVDC System Incorporating Transformer Magnetisation Characteristics

J. Vaheeshan, M. Barnes, R. Shuttleworth

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

    Abstract

    When an HVDC system is subjected to AC side short circuitfaults, the transformer core might be driven to saturation atfault recovery due to flux offset. The saturation will thereforecause the flow of inrush currents. In this paper, dynamicmodels of a MMC based VSC-HVDC system incorporatingtransformer magnetisation characteristics are derived andverified. Using disturbance sensitivity functions, the impactof attenuation of inrush currents due to different locations ofcurrent sensors (of inner current controller) is investigated. Itis shown that placing the current sensor at the converter sideof the transformer enable the inrush currents to attenuatefaster and prevents the converter from overcurrent exposure,allowing it to more successfully ride-through faults.
    Original languageEnglish
    Title of host publicationhost publication
    PublisherIEEE
    Publication statusPublished - Jun 2015
    EventIEEE PEDS 2015 - Sydney, Australia
    Duration: 9 Jun 201512 Jun 2015

    Conference

    ConferenceIEEE PEDS 2015
    CitySydney, Australia
    Period9/06/1512/06/15

    Keywords

    • HVDC transformer, saturation, inrush current, current transformer, fault ride through

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