【生产管理】PWM Techniques(pdf 19)-豆柴文库

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PWMTechniques


PowerElectronics1PWM
Outline

●Basicprinciples

●ClassificationofPWMtechniques

●SomemajorPWMtechniquesinDC/AC
inverters
●Severalpracticalissues

●PWMrectifier

PowerElectronics2PWM
TheMostWidelyUsedControlTechnique

DC/DCAC/AC

PulseWidthModulation
(PWM)

DC/ACAC/DC


PowerElectronics3PWM
BasicPrinciplesofPWM

Similarresponsetodifferentshapeofimpulse


PowerElectronics4PWM
BasicPrinciplesofPWM

Theequal-areatheorem
●Thisissinusoidal
PWM(SPWM)
●Theequal-area
theoremcanbeapplied
torealizeanyshapeof
waveforms


PowerElectronics5PWM
SomeMajorPWMTechniques

●Naturalsampling

●Calculationbasedonequal-areacriterion

●Selectedharmonicelimination

●Regularsampling

●Hysteresis-bandcontrol

●Triangularwavecomparisonwith
feedbackcontrol

PowerElectronics6PWM
NaturalSamplingPWM

Uni-polarPWMinsingle-phaseVSI


PowerElectronics7PWM
NaturalSamplingPWM

Bi-polarPWMinsingle-phaseVSI


PowerElectronics8PWM
NaturalSamplingPWM

In3-phaseVSI


PowerElectronics9PWM
SelectedHarmonicEliminationPWM


PowerElectronics10PWM
RegularSamplingPWM


PowerElectronics11PWM
Hysteresis-BandControlPWM

InSingle-phaseVSI


PowerElectronics12PWM
Hysteresis-BandControlPWM

In3-phaseVSI


PowerElectronics13PWM
TriangularWaveComparisonwith
FeedbackControl


PowerElectronics14PWM
FrequencyRelationbetweenCarrier
andControlsignal

●AsynchronousModulation
●SynchronousModulation


PowerElectronics15PWM
ImprovingOutputVoltageAmplitude


PowerElectronics16PWM
ConnectionofMultiplePWMVSI


PowerElectronics17PWM
PWMRectifier

OperationPrinciples


PowerElectronics18PWM
PWMRectifier

Three-phasecircuit


PowerElectronics19PWM