电力电子技术第5版 教学课件 作者 王兆安 Chapter03.ppt

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1、PowerElectronicsChapter3ACtoDCConverters(Rectifiers)Outline3.1Single-phasecontrolledrectifier3.2Three-phasecontrolledrectifier3.3Effectoftransformerleakageinductanceonrectifiercircuits3.4Capacitor-filtereduncontrolledrectifier3.5Harmonicsandpowerfactorofrectifiercircuits3.6Highpowercon

2、trolledrectifier3.7Invertermodeoperationofrectifiercircuit3.8Realizationofphase-controlinrectifiercircuits3.1Single-phasecontrolled(controllable)rectifier3.1.1Single-phasehalf-wavecontrolledrectifier3.1.2Single-phasebridgefully-controlledrectifier3.1.3Single-phasefull-wavecontrolledrec

3、tifier3.1.4Single-phasebridgehalf-controlledrectifier3.1.1Single-phasehalf-wavecontrolledrectifierHalf-wave,single-pulseTriggeringdelayangle,delayangle,firingangleResistiveload(3-1)3.1.1Single-phasehalf-wavecontrolledrectifierInductive(resistor-inductor)loadBasicthoughtprocessoftime-d

4、omainanalysisforpowerelectroniccircuitsThetime-domainbehaviorofapowerelectroniccircuitisactuallythecombinationofconsecutivetransientsofthedifferentlinearcircuitswhenthepowersemiconductordevicesareindifferentstates.ωt=a，id=0(3-3)(3-2)Single-phasehalf-wavecontrolledrectifierwithfreewheeli

5、ngdiodeMaximumforwardvoltage,maximumreversevoltageDisadvantages:OnlysinglepulseinonelinecycleDCcomponentinthetransformercurrentInductiveload(Lislargeenough)VTia)Tu1u2uVTLRdudVDiRVDR(3-5)(3-6)(3-7)(3-8)3.1.2Single-phasebridgefully-controlledrectifierForthyristor:maximumforwardvoltage,ma

6、ximumreversevoltageAdvantages:2pulsesinonelinecycleNoDCcomponentinthetransformercurrentResistiveloaddRTu1u2i2abVT1VT3VT2VT4udia)3.1.2Single-phasebridgefully-controlledrectifierResistiveloadAverageoutput(rectified)voltage(3-9)Averageoutputcurrent(3-10)Forthyristor(3-11)(3-12)Fortransfor

7、mer(3-13)3.1.2Single-phasebridgefully-controlledrectifierCommutationThyristorvoltagesandcurrentsTransformercurrentInductiveload(Lislargeenough)(3-15)Electro-motive-force(EMF)loadDiscontinuouscurrentidWithresistorElectro-motive-force(EMF)loadWithresistorandinductorWhenLislarge