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232001SVPWMTheStudyonRelationshipBetweenThree-levelPWMandSVPWMTaoChuanHuiWangQingling(Eelctricsandinformationcollege,AnhuiUniversityofscienceandtechnology,Huainan,Anhui232001)AbstractTheperformanceofthree-levelconverterissuperiortothatoftwo-levelconverterinmanyrespects.Ithasanextensiveapplicationespeciallyinhighvoltageandhighpowerarea.Thispaperanalysedtherelationshipbetweenthree-levelsvpwmandcarried-basedmodulationdetailedlyandgavethemathematicalexpressionofzerosequenceelement.Essentiallyitisdemonstratedthatspacevectormodulationisthesameascarried-basedmodulationafterejectedthezerosequenceelement.Atlast,itisverifiedbythesimulation.Keywordsvoltagespacevectorzerosequenceelementdistributioncoefficientcarried-basemodulation1PWMPWMdu/dtEMIMatlab/Simulink2NTVnearestthreevector7191ABC6sector,6region36201022451734121122211U1T1+U2T2=VrefTs1VrefTs1/3UdT1+1/3Udej60T2=Vrefej211sd3(1/3)/TTUUU=2sd23/TTUU=0s123d3(13)/sTTTTTTUUU==+3242PDphasedisposition224PWMSVPWMta=(1-K)tn3Tb=(1-K)tn+ty4Tc=(1-K)tn+ty+tx5tntxtyKK012Ua=ta/Ts-16Ub=tb/Ts-17Uc=tc/Ts82UaUbUc1-Ktn/Ts-1=Ua9((1-K)tn+ty)/Ts-1=Ub10((1-K)tn+ty+tx)/Ts=Uc11UaUbUc9~10ty=Ub-UaTs1210~11tx=Uc-Ub-1Ts13tn=Ts-tx-ty=Ts(2-Uc-Ua)1412~146~8Ua=Ua+(K-1)Uc-KUa-2K+1Ub=Ub+(K-1)Uc-KUa-2K+1Uc=Uc+(K-1)Uc-KUa-2K+12010226Uz=(K-1)Uc-KUa-2K+114Ua=Ua+(K-1)Ub-KUc-2K+1Ub=Ub+(K-1)Ub-KUc-2K+1Uc=Uc+(K-1)Ub-KUc-2K+1Uz=(K-1)Ub-KUc-2K+124121112regionSector1Sector21(K-1)Ua-KUb(K-1)Ua-KUc2(K-1)Ub-KUc(K-1)Ub-KUa3(K-1)Uc-KUb+K-1(K-1)Ua-KUb+K4(K-1)Ub-KUa+K(K-1)Uc-KUa+K-15(K-1)Uc-KUa+2K-1(K-1)Uc-KUb+2K-16(K-1)Uc-KUa+2K-1(K-1)Uc-KUb+2K-1KSVPWMSVPWM4Matlab/simulink4.1SVPWMSVPWM1234SVPWM33SVPWMMatlab44.254SVPWM5m=1m=0.7m=0.5k=0.5mkK6m=1m=0.7m=0.5k=0mk46201022622AA~B2B36[1]AN..[2].[M].:,2006.1.1973-267m=1m=0.7m=0.5k=1mk5K[1].[M].1.:,2007.[2],,.[M].1.:,2005.[3],,.[J].,2007,29(3):7-10.[4],.SVPWM[J].,2008,30(4):5-8.1979-201024