A Novel RPV (Reactive-Power-Variation)

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1、4998IEEETRANSACTIONSONPOWERELECTRONICS,VOL.28,NO.11,NOVEMBER2013ANovelRPV(Reactive-Power-Variation)AntiislandingMethodBasedonAdaptedReactivePowerPerturbationYeZhu,StudentMember,IEEE,DehongXu,Fellow,IEEE,NingHe,JieMa,JunZhang,YangfanZhang,GuoqiaoShen,Member,IEEE,andChangshe

2、ngHuAbstractInthispaper,anovelintermittentreactive-power-isaconditioninwhichtheDGsystemandthelocalloadsarevariation(RPV)methodbasedonloadsresonancefrequencyde-isolatedfromthepublicutilitysystemandcontinuetooperatetectionisproposedtoreducetheinjectedreactivepower.TheRPVinde

3、pendently[2].UnintentionalislandingofDGscancausemethoddetectsthefrequencyofpointofcommoncoupling(PCC)safetyproblemstothegenerators,theconnectedloadsandstaff.andoutputstheminimumreactivevariation,whichperturbsthefrequencyofPCCtothefrequencythresholdsdecidedbytheutilityThecu

4、rrentindustrypracticeistodisconnectalltheDGsimme-standardswhentheislandingconditionhappens.Furthermore,thediatelyoncetheislandingoccurs[3].AccordingtoIEEEStd.islandingdetectingcontrolstrategyunderunbalancedloadscon-929and1547,areliableandeffectivedetectionmethodmustbeditio

5、nisdiscussed.ComparedwiththetraditionalbilateralRPVemployedinaDGsystem[4].method,theproposedmethodonlyoutputunilateralRPVineachAntiislandingmethodscanbeclassifiedintotwocategories:variationperiodandthevariationamplitudeofeachperiodislessthan5%oftheoutputactivepower(P),thust

6、heperturbationDGresidentmethodsandcommunication-basedmethods.Theofreactivepowercanbereducedsignificantly.Inaddition,experi-DGresidentmethodscanbefurtherclassifiedintoactiveandmentalresultsofathree-phase30-kWinverteraregiventoverifypassivemethods[5].Thetwokeycriteriatoevaluat

7、eananti-theproposedmethod.Theproposedmethodisprovedtobecapableislandingmethodare:1)nondetectionzone(NDZ),whichisofislandingdetectionwithbalancedloads,motorloadswithinstan-definedasanareaofloadingconditionswhichareunabletodardpermissibledetectiontimes.Theapplicationoftheprop

8、osedmethodtounbalancedloadsisalsodiscussed.bedetectedbytheantiislandingmethod[6];2)detect