建模仿真Word格式文档下载.docx
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建模仿真Word格式文档下载.docx
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Cd=1000uF
Rload=20Ω
1.ExecuteDBRECT1toobtainVs,
isand
waveforms.
2.FromtheresultsoftheFourieranalysiscontainedintheoutputfileDBRECT1.OUT,calculatetheinputpowerfactorandthedisplacementpowerfactor.
DCCOMPONENT=-6.437959E-01
HARMONICFREQUENCYFOURIERNORMALIZEDPHASENORMALIZED
NO(HZ)COMPONENTCOMPONENT(DEG)PHASE(DEG)
16.000E+011.053E+011.000E+00-1.012E+010.000E+00
21.200E+021.133E+001.076E-018.844E+011.087E+02
31.800E+028.053E+007.648E-011.486E+021.790E+02
42.400E+027.412E-017.039E-02-9.389E+01-5.340E+01
53.000E+024.459E+004.235E-01-5.685E+01-6.228E+00
TOTALHARMONICDISTORTION=9.022789E+01PERCENT
THD=90.23%
DPF=
=0.98
PF=
=0.73
3.MakeuseoftheFourieranalysisinDBRECT1.OUTtoplot
and
.Superimposethedistortioncurrentcomponent
=
-
ontheaboveplot.
4.Calculate
(thermscurrentthoughthefiltercapacitor)asaratiooftheaverageloadcurrent
.
5.Plotthecurrentandvoltageassociatedwithoneofthediodes,forexample,
andobtaintheaverageandthermsvaluesofthecurrentasaratiooftheaverageloadcurrent.
6.VaryLsasaparametertoinvestigateitsinfluenceontheinputdisplacementpowerfactor,theinputpowerfactor,%THD,andthepeak-peakrippleinthedcvoltage
(1).Ls=2Mh
DCCOMPONENT=-6.096231E-01
16.000E+019.914E+001.000E+00-1.764E+010.000E+00
TOTALHARMONICDISTORTION=7.325412E+01PERCENT
THD=73.25%
=0.95
=0.77
(2).Ls=3mH
DCCOMPONENT=-3.405093E-01
16.000E+019.488E+001.000E+00-2.196E+010.000E+00
TOTALHARMONICDISTORTION=6.357699E+01PERCENT
THD=63.58%
=0.93
=0.78
thepeak-peakrippleinthedcvoltage
:
(Fromtoptobottom,respectively,
for
the
inductance
Ls=
1
~
3mH
waveform)
7.Varythefiltercapacitor
toinvestigateitsinfluenceonthepercentageripplein
inputdisplacementpowerfactorand%THD.Plotthepercentage∆Vd(peak-topeak)/Vd(average)asafunctionof
(1).Cd=500Uf
DCCOMPONENT=-2.267133E-05
16.000E+011.075E+011.000E+005.286E+000.000E+00
TOTALHARMONICDISTORTION=9.646523E+01PERCENT
THD=96.47%
=0.996
=0.72
(2).Cd=1000Uf
(3).Cd=1500Uf
DCCOMPONENT=1.844372E-01
16.000E+011.065E+011.000E+00-1.430E+010.000E+00
TOTALHARMONICDISTORTION=8.640326E+01PERCENT
THD=86.40%
=0.97
8.Varytheloadpowertoinvestigateitsinfluenceontheaveragedcvoltage.
9.Inthenominalcircuitinputfile,removethelimitonthemaximumtimestepduringthesimulationandobserveitsinfluenceonthecircuitwaveforms.
10.ObtaintheVs,isand
waveformsduringthestartuptransientwhenthefiltercapacitorisinitiallynotcharged.Obtainthepeakinrushcurrentasaratioofthepeakcurrentinsteadystate.Varytheswitchinginstantbysimplyvaryingthephaseangleθofthesource
Theabscissais0~50ms:
Theabscissais0~20ms:
thepeakinrushcurrentasaratioofthepeakcurrentinsteadystate:
Theabscissais0~50ms:
11.Replacethedcsideofthediodebridgebyacurrentsource
=10A,correspondingtoaverylargeLd.MakeLsalmostequaltozero.Obtain
Theaverageoutputvoltagewaveformisasfollows:
12.MakeLs=3mHinProblem10andobtain
(average),displacementpowerfactor,powerfactor,%THD,andthecurrentcommutationinterval.
Loadvoltageaverage:
Vs,Is,Vd,waveformasfollows:
DCCOMPONENT=5.708134E-02
16.000E+011.371E+011.000E+00-2.198E+010.000E+00
TOTALHARMONICDISTORTION=6.303744E+01PERCENT
THD=63.04%
=0.79
U=0.0042×
360×
60=90.72
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