建模仿真2.docx
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建模仿真2.docx
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建模仿真2
课程设计任务书
课程名称
电力电子建模与仿真
学生姓名
王建辉
学号
20092408
专业班级
电气专业电气(5)级
指导教师
茆美琴
2011年12月
3-phaseThyristorRectifierBridge(THYRECT3)
NominalValues:
VLL(rms)=208Vat60Hz
Ls1=0.2mH
LS2=1.0mH
Ld=16mH
Rload=8
Delayangle=450
Problems
1.(a)Obtain,andwaveformsusingThyrect3.
FromuptodownforVa,Vd,andidofthewaveform:
(b)Obtainandwaveforms.
FromuptodownforVa,iawaveform:
(c)Obtain,andwaveforms.
Fromtoptobottom,respectively(Va)pcc,(Vab)pccandiawaveform:
2.Fromtheplots,obtainthecommutationintervaluandatthestartofthecommutation.Verifythefollowingcommutationequation:
whereFor,usetheaveragevalueoforitsvalueatthestartofthecommutation.
Theoutputvoltageandcurrentto0~20msabscissadenotesthewaveform:
TheabovecanreadthecommutationtimeintervalandgetaphaseAngleforu,andthenbasedontheknownconditioncorrespondingparametersarecalculated
t=256.778us;f=60Hz;u=360×60×0.256778÷1000=5.5
a=45
=0.636
Ls=Ls1a+Ls2a=1.2mH
VLL=208V
Belowtheaverageoutputcurrentwaveform:
Fromthepicturecanreadtheoutputcurrentaverage:
Id=23.3A
Accordingtotheaboveparameterscalculationequationfortheleft:
-Id=0.635
Thisshows,onbothsidesoftheequationarecalculatedapproximatelyequalvalue.
3.BymeansofFourieranalysisof,calculateitsharmoniccomponentsasaratioof.
FOURIERCOMPONENTSOFTRANSIENTRESPONSEI(L_Ls2a)
DCCOMPONENT=3.027748E-05
HARMONICFREQUENCYFOURIERNORMALIZEDPHASENORMALIZED
NO(HZ)COMPONENTCOMPONENT(DEG)PHASE(DEG)
16.000E+012.591E+011.000E+00-4.756E+010.000E+00
21.200E+026.800E-032.624E-04-9.772E+01-2.597E+00
31.800E+021.475E-045.693E-06-8.097E+016.172E+01
42.400E+027.200E-032.778E-041.695E+023.598E+02
53.000E+025.977E+002.306E-01-5.762E+011.802E+02
63.600E+021.650E-046.369E-061.730E+024.583E+02
74.200E+022.701E+001.042E-01-1.537E+021.793E+02
84.800E+026.615E-032.553E-041.562E+025.366E+02
95.400E+025.425E-052.094E-061.753E+026.034E+02
106.000E+026.756E-032.607E-046.227E+015.379E+02
116.600E+022.233E+008.615E-02-1.635E+023.597E+02
127.200E+021.348E-045.200E-066.503E+016.358E+02
137.800E+021.521E+005.869E-021.013E+027.196E+02
148.400E+025.914E-032.282E-044.837E+017.142E+02
159.000E+024.640E-051.791E-066.686E+007.201E+02
169.600E+026.088E-032.349E-04-4.516E+017.158E+02
171.020E+031.298E+005.009E-029.093E+018.995E+02
181.080E+031.663E-046.415E-06-3.839E+018.177E+02
191.140E+031.011E+003.900E-02-4.139E+008.995E+02
201.200E+034.938E-031.906E-04-5.981E+018.914E+02
211.260E+038.547E-053.298E-06-8.519E+019.136E+02
221.320E+035.071E-031.957E-04-1.526E+028.937E+02
231.380E+038.592E-013.316E-02-1.462E+011.079E+03
TOTALHARMONICDISTORTION=2.829395E+01PERCENT
AccordingtoaboveFourieranalysis,cangetcurrentbasewavecomponent:
is1=25.91=25.91
IS1=25.91=18.32
IS1=0.78Id;IS=0.816Id
==1.046
4.Calculate,%THDintheinputcurrent,theinputdisplacementpowerfactorandtheinputpowerfactor.
ThroughtheabovetheFourieranalysisresults,accordingtothebookrelatedformula,wecancalculateIs,THD,inputpowerfactor,thevalueoftheinputpowerfactordistortionareasfollows:
Is=18.321.046=19.16A
%THD=28.3%
DPF==0.675
PF==0.649
5.Verifythefollowingequation:
Displacementpowerfactor
Throughtheaboveafewquestionscalculateddistortionpowerfactor,andthecommutationintervalu,wecanverifytheaboveformula.
DPF=0.675
=0.672
[+]/2=0.672
Bycalculatingresultsknowthreeformulascanbeapproximatelyequal
DPF
6.Atthepointofcommoncoupling,obtainthefollowingfromthevoltagewaveform:
(a)Line-notchdepthρ(%)
(b)Line-notchareaand,
(c)voltageTHD%
ThisillustrationshowstheinductanceoftheLs2aandL7priortothenodesbetweenvoltagewaveform:
Wecanseethevoltagesagfordepth26.213V
ThisillustrationshowstheinductanceLs2aandL7afterbetweennodestothevoltagewaveform:
Wecanseethevoltagesagfordepth155.808V
FOURIERCOMPONENTSOFTRANSIENTRESPONSEV(N01967,N01985)
DCCOMPONENT=-9.314276E-05
HARMONICFREQUENCYFOURIERNORMALIZEDPHASENORMALIZED
NO(HZ)COMPONENTCOMPONENT(DEG)PHASE(DEG)
16.000E+011.237E+011.000E+004.244E+010.000E+00
21.200E+021.729E-011.398E-02-1.697E+02-2.546E+02
31.800E+023.049E-042.465E-058.837E+01-3.896E+01
42.400E+021.501E-011.214E-029.782E+01-7.196E+01
53.000E+021.414E+011.143E+003.226E+01-1.800E+02
63.600E+022.226E-041.800E-05-6.430E+01-3.190E+02
74.200E+029.177E+007.420E-01-6.377E+01-3.609E+02
84.800E+024.655E-013.763E-027.470E+01-2.648E+02
95.400E+021.779E-041.438E-058.778E+01-2.942E+02
106.000E+024.431E-013.583E-02-2.012E+01-4.446E+02
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