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基于DSP的SVPWM实现
Introduction:
SVPWM(SpaceVectorPulseWidthModulation)isanadvancedmodulationtechniqueimplementedinvariouspowerelectronicapplicationslikeinverters,ACdrives,andUPSsystems.ThemainobjectiveofSVPWMistoincreasetheoverallefficiencyandreduceharmonics.SVPWMisalsousedtocontrolthespeedandtorqueofACmachinesbycontrollingtheamplitudeandfrequencyoftheoutputvoltage.
Inthispaper,wewilldiscusstheimplementationofSVPWMusingDigitalSignalProcessing(DSP)technology.DSPisapowerfultechnologythatisusedtoprocessthedigitalsignalsandperformvariouscomputationaltasksforcontrolandcommunicationapplications.TheuseofDSPtechnologyinSVPWMimplementationprovidessuperiorcontrolandspeedregulationwithhighaccuracyandflexibility.
SVPWMTechnique:
SVPWMisamodulationtechniquethatisusedtogenerateathree-phaseACvoltagefromDCvoltage.ThebasicprincipleofSVPWMistogenerateaspacevectorthatrepresentsthedesiredoutputvoltageandthensynthesizesthevoltagebyadjustingtheswitchingtimesoftheconverter.TheSVPWMtechniquegeneratesasetofvoltagevectorsthatarerepresentedintheformofthree-phasesinewaves.
TheSVPWMtechniqueisbasedontheconceptofvectorsummationandissuperiortootherPWMtechniqueslikeSPWMandHPWM.InSVPWM,thevoltagevectorisdividedintotwocomponents,i.e.,themagnitudeandangle.Themagnituderepresentstheamplitudeoftheoutputvoltage,andtheanglerepresentsthephasedifferencebetweenthephases.
TheSVPWMtechniqueusestworeferencesignals,asinewave,andacosinewave,todeterminethemagnitudeandangleofthespacevector.Thesineandcosinewavesarecombinedtogenerateareferencevoltagevectorbythefollowingformula:
V_ref=V_cosθ+V_sin(π/3-θ)
Where,V_cosandV_sinarethemagnitudesofthecosineandsinewaves,respectively,andθistheangleofthereferencevector.
Oncethereferencevoltagevectorisgenerated,thethree-phaseoutputvoltageissynthesizedbyswitchingtheDCvoltageatdifferentintervalstogenerateaseriesofPWMpulses.Theswitchingintervalsaredeterminedbycomparingthereferencevoltagewiththeactualvoltageusingacomparator.ThecomparatorgeneratesthePWMpulsesbasedonthecomparisonbetweenth