%0 Journal Article %T High Voltage Apparatus Combined Active Islanding Detection Method for Grid-connected Photovoltaic System %A WEIQuan %A WANGYifei %A ZHUJing %A YINXiaogang %A LIUZhuang %J ¸ßѹµçÆ÷ %P 37-42 %D 2014 %X Unintentionalislandingphenomenonhasbeenoneofthemostimportantproblemsofgrid-connectedphotovoltaicinverters.Topreventthisphenomenon,allkindsofanti-islandingmethodshavebeendiscussed.Thispaperpresentsacombinedactiveislandingdetectionmethod,whichconsistsofactivefrequencydriftmethodandautomaticphase-shiftmethod.Thetraditionalactiveanti-islandingmethodsofgrid-connectedPVinvertersbearnondetectionzonepossibilitiesforcertainparalleledRLCloads.Thecombinedmethodshowsislandingdetectionabilityeffectively,anditcaneliminatenondetectionzonesevenintheworstcaseconditions.Simulationindifferentloadconditionsisperformedforverification. %K anti-islandingmethod %K photovoltaicinverter %K activefrequencydrift %K automaticphaseshift %K nonde-tectionzone %U http://www.zgydq.com/oa/DArticle.aspx?type=view&id=201410007