基于PWM逆变器的LC滤波器

第24卷第5期2007年5月MECHANICAL&ELECTRICALENGINEERINGMAGAZINEVo.l24No.5May2007:2006-12-27:(1982-),,,基于PWM逆变器的LC滤波器俞杨威,金天均,谢文涛,吕征宇(,310027):为了使脉宽调制(PWM)逆变器具有较好的输出波形,针对PWM逆变器谐波次数较高的特点,采用二阶LC低通滤波网络从逆变器无功容量最小的角度,介绍了一种单相电压型PWM逆变器LC滤波器的设计方法,该方法综合考虑了滤波器的频率特性功率因数等要素,根据该方法选择LC参数,可以优化滤波器性能:脉宽调制;逆变器;LC滤波器;无功容量:TM46:A:1001-4551(2007)05-0050-03LCfilterbasedonPWMinverterYUYangwe,iJINTianjun,XIEWentao,LVZhengyu(InstituteofPowerElectronics,ZhejiangUniversity,Hangzhou310027,China)Abstract:TheordersoftheharmonicsofPWMinvertersoutputvoltageareveryhigh.TwoordersLClowerpassfilternetwasusedtogetbettersinusoidaloutputwaveform.AdesignedapproachoffilterforsinglephasevoltagesourcePWMinverterbasedontheminimumreactivecapacityoffilterwasproposed.Thisapproachconsidersmultielementsuchasfrequencycharacteristic,powerfactor,etc.TheperformanceofthefilterwouldbeoptimizediftheparametersofLCarechoosedbytheapproachpresented.Keywords:pulsewidthmodule(PWM);inverter;LCfilter;reactivecapacity0前言,PWM,,[1]PWMLC,LC,,,,LC,,LC1LC滤波器的分析PWM,1,:Ed;!;∀;#1PWMPWM,,,,:;!;∀;#[2],LC:Uo(s)Ui(s)=11L2s2+2Ls+1(1)L∃LC,L=1LC;∃,=12RLC;Uo(s)∃;Ui(s)∃;s∃2LC滤波器参数设计2.1PWMUo,n=jk(j=1,2,3%%),k(),n=jk&b,j+b∋,,2[3]22,PWM:n=k&b,,b,k,k,,LCfL=12LCPWM,[4],LCfL:10f1fLfhar(min)f1∃;fhar(min)∃PWM,10,fL1/10~1/52.2LC,,LCLCLC,33LCPWMQ[5]:Q=[1LI2s+()m=2mLI^ms2]+[1U20+()m=2mCU^2mo](2)1∃;m∃m;Is∃;I^ms∃m;Uo∃;U^mo∃mPWM,,(2):Q∗1LIs2+1CUo2(3)LC:L=1LC(4),,,,,LC(4):C=1L2L(5)(5)(3),:Q=1LIs2+1Uo2L2L(6),:Is=Io2+(1CUo)2(7)Q=1L[Io2+(1CUo)2]+w1Uo2L2L(8)(5)(8),:Q=1Io2L+1Uo2L2+13Uo2L41L(9)515,:PWMLC(9),Uo,Io,QL,Q,!Q!L=0,!Q!L=1Io2-1Uo2L2|+13Uo2L41L2(10)L=1Uo2L2+13Uo2L1Io2(11)L,(5),C3设计实例PWM,:Uo=240V,6kVA,f1=50Hz,fs=20kHz,1,THD,fL=0.1fs=2kHz,(11),:L=700∀H;C=10∀F,:Uo(s)Ui(s)=17+10-9s2+7.3+10-5s+1(12)LCbode,4bode,400rad/s,50Hz20kHz,(104rad/s)4bode,,,5240V,2.9%,LC,,,54结束语PWM,LC,,LC,(Reference):[1],,,.PWM[J].,2003,33(3):12-15.WUJiajv,ZHANGYiguo,RENJilin,eta.lAmethodtodesignoffilterforsinglephasePWMinverter[J].ElectricDrive,2003,33(3):12-15.[2],.[J].:,2004,32(5):1-4.XIEYunxiang,JIANGLinzheng.Outputfilterparameteranalysisanddesignofharmoniceliminationcontrolinverters[J].JournalofSouthChinaUniversityofTechnology:NaturalScienceEdition,2004,32(5):1-4.[3].[M].:,2002.[4],,,.PWMLC[J].:,2003,43(3):345-348.SONGQing,LIUWenhua,YANPinggu,ieta.lLCfilterdesignforhighpowerPWMvdtagesourceinverter[J].JournalofTsinghuaUniversity:ScienceandTechnology,2003,43(3):345-348.[5]DAHONOPA,PURWADIA,QAMARUZZAMAN.AnLCfilterdesignmethodforsinglephasePWMinverters[C]//PowerElectronicsandDriveSystems.Proceedingsof1995InternationalConferenceonFeb21-24.1995:571-576.[:]5224