电力电子技术第5版 教学课件 作者 王兆安 Chapter10.ppt

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1、PowerElectronicsChapter10ApplicationofPowerElectronicsApplicationofPowerElectronics10.1DCmotordrivers(thyristor-DCmotorsystem)10.2FrequencyconvertersandACdrivers10.3UninterruptiblePowerSupply(UPS)10.4SwitchingPowerSupply10.5Powerfactorcorrection(PFC)10.6Applicationinutility

2、powersystem10.7Otherapplications10.1DCmotordrivers(Thyristor-DCmotorsystem)10.1.1Rectifiermodeofoperation10.1.2Invertermodeofoperation10.1.3ReversibleDCmotordrivesystem(four-quadrantoperation)10.1.1RectifiermodeofoperationWaveformsof3-phasehalf-waverectifierwithDCmotorload

3、(10-1)Waveformsandequations(for3-phasehalf-wave)whereSpeed-torque(mechanic)characteristicwhenloadcurrentiscontinuousFor3-phasehalf-wave(10-2)For3-phasebridge(10-3)(10-4)(10-5)For3-phasehalf-waveSpeed-torque(mechanic)characteristicwhenloadcurrentisdiscontinuousEMFatnoload(

4、taking3-phasehalf-waveasexample)Fora60ºFora>60ºFor3-phasehalf-waveSpeed-torque(mechanic)characteristicwhenloadcurrentisdiscontinuousFordifferentaThepointofEMFatnoloadisraisedup.Thedroopratebecomessteer.(softerthanthecontinuousmode)For3-phasehalf-wave(a1a4>60

5、º)10.1.2InvertermodeofoperationEquationsarejustthesameasintherectifiermodeofoperationexceptthatUd,EMandnbecomenegative.E.g.,in3-phasehalf-waveOrinanotherform(10-3)(10-4)(10-11)(10-12)eCn-=1å+RIUddbcos00cos(å+-=RIUEddMbSpeed-torquecharacteristicofaDCmotorfedbyathyristorrect

6、ifiercircuit)10.1.3ReversibleDCmotordrivesystem(4-quadrantoperation)Back-to-backconnectionoftwo3-phasebridgecircuits4-quadrantspeed-torquecharacteristicofReversibleDCmotordrivesystem10.2FrequencyconvertersandACdriversCompositeconvertersIndirectACtoACconverters(AC-DC-ACcon

7、verters)IndirectDCtoDCconverters(IsolatedDCtoDCconverters)Compositeconverter:CombinationoftwoormoreconvertersincascadedconnectionIndirectACtoACconverters(AC-DC-ACconverters)AC-DC-ACconvertersVoltage-sourcetypeCurrent-sourcetypeClassificationsAccordingtotypeoftheDClinks:Acc

8、ordingtowhetheroutputvoltageandfrequencyisvariable:Innarrowsense,frequencyconvert