simulink_power_system04

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1、Three-PhaseFaultboxoftheMultimeterblock,themeasurementsareidentifiedbyalabelfollowedbytheblocknameandthephase:MeasurementLabelFaultvoltagesUb/FaultA:Ub/FaultB:Ub/FaultC.FaultcurrentsIb/FaultA:Ib/FaultB:Ib

2、ockname>/FaultC.InputsandThethreefaultbreakersareconnectedinwyebetweenterminalsA,BandCOutputsandtheinternalgroundresistor.IftheThree-PhaseFaultblockissettoexternalcontrolmode,aSimulinkinputisaddedtotheblocktocontroltheopeningandclosingofthethreeinternalbreakers.

3、ExampleSeethepower_3phseriescompdemoforacircuitusingtheThree-PhaseFaultblock.SeeAlsoBreaker,Multimeter,andThree-PhaseBreaker7-495Three-PhaseHarmonicFilterPurpose7Three-PhaseHarmonicFilterImplementfourtypesofthree-phaseharmonicfiltersusingRLCcomponentsLibraryElem

4、entsDescriptionThree-phaseharmonicfiltersareshuntelementsthatareusedinpowersystemsfordecreasingvoltagedistortionandforpowerfactorcorrection.Nonlinearelementssuchaspowerelectronicconvertersgenerateharmoniccurrentsorharmonicvoltages,whichareinjectedintopowersystem

5、.Theresultingdistortedcurrentsflowingthroughsystemimpedanceproduceharmonicvoltagedistortion.Harmonicfiltersreducedistortionbydivertingharmoniccurrentsinlowimpedancepaths.Harmonicfiltersaredesignedtobecapacitiveatfundamentalfrequency,sothattheyarealsousedforprodu

6、cingreactivepowerrequiredbyconvertersandforpowerfactorcorrection.Inordertoachieveanacceptabledistortion,severalbanksoffiltersofdifferenttypesareusuallyconnectedinparallel.Themostcommonlyusedfiltertypesare•Band-passfilters,whichareusedtofilterlowestorderharmonics

7、suchas5th,7th,11th,13th,etc.Band-passfilterscanbetunedatasinglefrequency(single-tunedfilter)orattwofrequencies(double-tunedfilter).•High-passfilters,whichareusedtofilterhigh-orderharmonicsandcoverawiderangeoffrequencies.Aspecialtypeofhigh-passfilter,theC-typehig

8、h-passfilter,isusedtoprovidereactivepowerandavoidparallelresonances.Italsoallowsfilteringloworderharmonics(suchas3rd),whilekeepingzerolossesatfundamentalfrequency.The