三电平技术简介

25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.NeutralPointClampedInverterDo’sandDoNots25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page2Agenda–NPCTopologyderivation–Advantages,disadvantagesofNPCinverter–OperationmodesofNPC–FlowNPC0–ANewSolutionforUPS,SolaranddriveinverterApplications–Conclusion25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page3NPCtopologyderivationVout=D*VinVout=Vin*sin(wt)withD(t)=sin(wt)UnipolarOutput25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page4+NPCtopologyderivation++Addingcomponents25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page5NPCtopologyderivationInsertingpolarityswitches25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page6NPCtopologyderivationConnectingblockstogether25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page7NPCinverterBipolaroutputunidirectionalpowerNPCtopologyderivationNopathforrectivecurrentVout(t)*Iout(t)025-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page8NPCtopologyderivationNPCinverterBipolaroutputbidirectionalpower4quadrantoperationInversediodescreatepathforrectivecurrenttooVout(t)*Iout(t)025-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page9AdvantagesComparedto1200VIGBThalfbridge•Total+/-supplyvoltageisshared•3levelvoltageonoutput-smalleroutputcurrentripple•All600Vcomponents-arefaster•All600Vcomponents-havesmallervoltagedropAdvantage,disadvantageofNPCDisadvantagesComparedto1200VIGBThalfbridge•Morecomponentstohandle–10against4•4IGBTstodrive(3floating)against2(1floating)25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page10OperationmodesofNPCSinewaveoutput25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page11OperationmodesofNPCSinewaveoutputrealpower25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page12SinewaveoutputrealandreactivepowerOperationmodesofNPC25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page13OperationmodesofNPCCurrentandcommutationloopsatrealpower25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page14OperationmodesofNPCCurrentandcommutationloopsatreactivepower25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page15OperationmodesofNPCWaveformsofNPCinverterwithreactivepower25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page16OperationmodesofNPCStandardsplittedsupplyhalfbridgeinverter25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page17OperationmodesofNPCComparisonoftopologies25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page18OperationmodesofNPCComparisonofwaveformsHalfbridgeNPC25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page19OperationmodesofNPCHalfbridgeNPCFFTTimeDistortion25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page20SolarinverterapplicationOptimalcomponentselection•Highefficientswitchingbuckstageswith600VCoolMOS+600VSiCZeroRecoveryrectifier•Lowvotagedrop600VtrenchIGBTpolarityswitches•Allinonemoduleconstruction•NPCinvertersupplyisgroundedtoeliminatecommonvoltageproblemfortransformatorlesssolarinverter•SplittedsupplyformultistringsolarpanelconnectionOptimaltopologyselection25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page21SolarinverterapplicationLayoutoptimizationrealloadPositivecommutationloop3nHNegativecommutationloop3nH25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page22Solarinverterapplication§3,4kWStaticload(15A)§350VDCvoltage§Fixedoutputfrequencyoperation(50Hz)§Modulationfrequency=16kHz§Hardswitchingenvironment§Sinusoidaloutputvoltagewaveform(230VAC)§Sinusoidaloutputcurrentwaveform§Unitypowerfactor(cosfi=1)§Installationcostis3-5Euro/WpConditionsforoptimization25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page23Solarinverterapplication42W90W108WTotallosses98,8%97,4%96,8%Efficiency2*(2W+0W+0W)=4W2*(15W+9W)=48W2*(30W+12W)=84WSwitchinglosses2*(8W+3W+8W)=38W2*(20W+1W)=42W2*(11W+1W)=24WStaticlossesNPC(Mixed)T1,D1,T3,T2,D2,T4Halfbridge(FastIGBT)T1,T2,FREDsHalfbridge(TrenchIGBT)T1,T2,FREDs25-Jan-08InformationisVincotechConfidential&Proprietary.DoNotReproduceorDistribute.Page24SolarinverterapplicationEuropeanefficiency(weighted)HalfbridgeNPC96,4%99,3%+230Eurovalue+1%power=17W=80EurogainComparisonofefficienciesforoptimizationNPChalfbridge0,900,910,920,930,940,950,960,970,980,991,000,00,20,40,60,81,01,21,4Pout/PnomEfficiencyweighting02040600,10,20,40,60,81,01,21,4Pout/Pnom%25-Jan-08InformationisVincotechConfidential&Propr