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dc.contributor.authorRoslan, Nurul Fazlin
dc.contributor.authorSuul, Jon Are Wold
dc.contributor.authorRocabert, Joan
dc.contributor.authorRodríguez, Pedro
dc.date.accessioned2018-04-04T06:54:08Z
dc.date.available2018-04-04T06:54:08Z
dc.date.created2018-03-19T15:39:51Z
dc.date.issued2017
dc.identifier.citationIEEE transactions on industry applications. 2017, 53 (6), 5795-5809.nb_NO
dc.identifier.issn0093-9994
dc.identifier.urihttp://hdl.handle.net/11250/2492452
dc.description.abstractGrid synchronization based on virtual flux (VF) estimation allows for control of grid-connected power converter without depending on ac-voltage measurements. This is useful in voltage-sensor-less applications for reducing cost and complexity of the control hardware, and can be utilized in case of limited reliability or availability of voltage measurements at the intended point of synchronization to the grid. However, for voltage source converters (VSC) with LCL filters, the influence of the capacitor current must be taken into account to ensure accurate VF estimation at the point of common coupling (PCC) with the grid. This paper presents a comparative evaluation of three VF-based methods for grid synchronization of VSCs with LCL filters, with three different ways of obtaining the capacitor current. The VF estimation in the first method is based only on the measured converter currents. The second method includes capacitor voltage measurements used for estimating the capacitor currents, while the capacitor currents are measured in the third approach. Comparative results from time-domain simulations are presented, demonstrating good performance of the estimation and accurate control of the active and reactive power at the PCC with all three methods, as long as sufficiently accurate filter parameters and current measurements are available. However, the approach based on capacitor current measurements is sensitive to noise due to the high ripple current compared with the fundamental frequency current in the capacitors. The operation of a converter with VF-based grid synchronization including estimation of the capacitor current is demonstrated by experimental results, verifying the voltage sensor-less operation with LCL filter. © 1972-2012 IEEE.nb_NO
dc.language.isoengnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleA Comparative Study of Methods for Estimating Virtual Flux at the Point of Common Coupling in Grid-Connected Voltage Source Converters with LCL Filternb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.rights.holderAuthors have copyright to accepted versionnb_NO
dc.source.pagenumber5795-5809nb_NO
dc.source.volume53nb_NO
dc.source.journalIEEE transactions on industry applicationsnb_NO
dc.source.issue6nb_NO
dc.identifier.doi10.1109/TIA.2017.2743200
dc.identifier.cristin1574106
cristin.unitcode7548,50,0,0
cristin.unitnameEnergisystemer
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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