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dc.contributor.authorBergna-Diaz, Gilbert
dc.contributor.authorSuul, Jon Are Wold
dc.contributor.authorBerne, Erik
dc.contributor.authorVannier, Jean-Claude
dc.contributor.authorMolinas Cabrera, Maria Marta
dc.date.accessioned2019-02-05T11:46:46Z
dc.date.available2019-02-05T11:46:46Z
dc.date.created2019-01-31T08:08:32Z
dc.date.issued2019
dc.identifier.issn2168-6777
dc.identifier.urihttp://hdl.handle.net/11250/2583922
dc.description.abstractA constrained optimization problem based on the Lagrange multipliers method is formulated to derive the circulating current references of Modular Multilevel Converters (MMC) directly in abc coordinates. The resulting analytic expressions for calculating the circulating current reference signals are designed to eliminate oscillations in the dc-side power flow, independently from the ac-side operation of the MMC. As a result of the constrained optimization, the circulating currents are shaped to optimally utilize the degrees of freedom provided by the internal energy buffering capacity of the MMC, to effectively decouple the ac grid conditions from the dc bus. This property of the proposed control method makes it especially suitable for preventing oscillations due to unbalanced ac grid voltage conditions from propagating into multi-terminal HVDC systems. It is shown that the power flow at the dc-side of the MMC will be most effectively decoupled from ac-side transients if the desired steady-state power flow is imposed by acting directly on the circulating current references instead of by acting on the acside current references. The operation of an MMC controlled by the proposed approach is demonstrated by simulation studies, verifying the ability of keeping the dc power flow free of second harmonic oscillations, independentlynb_NO
dc.description.abstractOptimal Shaping of the MMC Circulating Currents for Preventing AC-side Power Oscillations from Propagating into HVDC Gridsnb_NO
dc.language.isoengnb_NO
dc.publisherIEEEnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleOptimal Shaping of the MMC Circulating Currents for Preventing AC-side Power Oscillations from Propagating into HVDC Gridsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.journalIEEE Journal of Emerging and Selected Topics in Power Electronicsnb_NO
dc.identifier.doi10.1109/JESTPE.2019.2894677
dc.identifier.cristin1669630
dc.relation.projectNorges forskningsråd: 268053nb_NO
cristin.unitcode7548,50,0,0
cristin.unitnameEnergisystemer
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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