《电力电子技术》课程教学课件（PPT讲稿）Topic 12 AC square waveforms inverter、Theorem of SPWM（2）

Naotot1Val2PatternPattern2Q: Which pattern is better?一年Tb, =] u(t)sin(not)dt =美一0）一兴h兴（)3华州兴FA贵-]水5

Pattern 1 Pattern 2 U3, f1 v1 t U3, f1 v1 t Q: Which pattern is better? 1 0 T n T b = 2 u(t)sin(nt)dt = 

新1+T万7H卡VVA2VaP2V4esinwtdwtrEeSoutb=12+CosT2721l2T正工7T开世中Valo.9654o288-Var东二1-034二ThFPtco3m=Vd(-)0Va一srsut中63=T年3TV3PL9（+）5T祥VaCEVAbasswt5Tb5-5T翠67[兰g]VAT(J)VaosTit7Tb7=望T69=0Va开Va1Casut63PT=OT翠[-一(104)6u=7开VA()VaoasllwebuTITVA(1034)UTTb13[-6附0)7--13TVa.开CVaC0513~tb1313TT-13T车

1.4Regulationofvoltagefrequency in1leginverter+木CU1,f1+ANV1otVaU1, f2U1, f3ototf1>f2>f3

1.4 Regulation of voltage frequency in 1 leg inverter ZL v1 t v1 t U1, f1 U1, f2 U1, f3 f1>f2>f3 o A

1.5Regulationofbothamplitude&freguencyin1leginverte木TVaiXU2, f2ANV1otU4, f4U1, f1otU1>U2>U4f1>f2>f4

1.5 Regulation of both amplitude & frequency in 1 leg inverter ZL v1 t v1 t U4, f4 v1 t U1, f1 U2, f2 o A U1>U2>U4, f1>f2>f4

U1, f2U2, f2ototdU4, f4U3, f3ot3Vu/1U1>U2>U3>U4,f1>f2>f3>f4

v1 t v1 t U1, f2 U3, f3 U4, f4 U1>U2>U3>U4, f1>f2>f3>f4 v1 t U2, f2