针对SVPWM死区问题一种新的控制方法-豆柴文库

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针对SVPWM死区问题一种新的控制方法
Introduction
SpaceVectorPulseWidthModulation(SVPWM)isanefficientmodulatingtechniqueusedinACdrivestocontroltheACmotor.SVPWMtechniqueensuresbetterutilizationoftheDCvoltageandminimizestheharmoniccontentintheoutputwaveform.However,oneofthemajorchallengesinimplementingSVPWMisthedeadtimeproblem.Deadtimeoccursduetoelectronicswitches'turn-offdelayandcanleadtonon-linearitiesanddistortionsintheoutputwaveform.ThispaperdiscussesanewcontrolmethodtoaddresstheSVPWMdeadtimeproblem.
DeadTimeProbleminSVPWM
InSVPWM,areferencevoltagevector(Vref)isgeneratedbasedonthedesiredoutputvoltageandphaseangle.Thisreferencevoltagevectoristhencomparedwiththeactualvoltagevector(Van,Vbn,Vcn)generatedbytheinverter.Thedifferencebetweenthetwovectorsisusedtogeneratetheswitchingsignalsfortheelectronicswitches.Theswitchingsignalsdeterminewhichswitchesshouldbeturnedonandofftogeneratethedesiredoutputvoltage.
However,inpracticalscenarios,thereisafiniteturn-offdelaytimefortheelectronicswitches.Thisturn-offdelayisreferredtoasdeadtime.Deadtimecancausenon-linearitiesanddistortionsintheoutputwaveformasitcreatesamismatchbetweenthedesiredandactualoutputvoltages.Theeffectofdeadtimeismorepronouncedathighfrequencies,anditcanleadtomotorheatingandreducedefficiency.
Conventionalmethodstoaddressthedeadtimeproblemincludeincreasingtheswitchingfrequency,insertingdelaycompensationcircuits,andaddinghardwarefilters.However,thesemethodshavelimitationsandmayleadtoaddedcomplexityandcost.
NewControlMethodforDeadTimeProblem
ThenewcontrolmethodproposedforaddressingtheSVPWMdeadtimeproblemisbasedonpredictivecontrol.Theproposedmethodaimstopredicttheeffectofdeadtimeontheoutputvoltageandadjustthereferencevoltagevectoraccordinglytocompensateforthedeadtime.
Theproposedcontrolmethodincludesthefollowingsteps:
Step1:Estimatethedeadtimedelaybasedontheswitchingsignalsandtheelectronicswitch'scharacteristics.
Step2:Predicttheoutputvoltagedistortioncausedbythedeadtimebysimulatingtheswitchingsignalsandthedeadtimedelay.
Step3:Adjus