双语建模实验一答案.docx

双语建模实验一答案.docx

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双语建模实验一答案

1-phaseDiodeBridgeRectifiers（DBRECT1）

1,ExecuteDBRECT1toobtainvs,isandvdwaveforms

Iswaveform

Vs

vs

waveform

Vdwaveform

2,FromtheresultsoftheFourieranalysiscontainedintheoutputfileDBRECT1.OUT,

calculatetheinputpowerfactorandthedisplacementpowerfactor.

DPF=COS（-9.959）=0.985,THD=0.8906

PARAMLS_VALUE=1.0000E-03

PHASE（DEG）=-9.959E+00PF=

=0.7356

PARAMLS_VALUE=2.0000E-03

PHASE（DEG）=-1.760E+01

DPF=COS（-17.60）=0.953,THD=7.219879E+01PERCENT

PF=

=0.7728

PARAMLS_VALUE=3.0000E-03

PHASE（DEG）=-2.198E+01

DPF=COS（-21.98）=0.9273,THD=6.303744E+01PERCENT

PF=

=0.7845

3，MakeuseoftheFourieranalysisinDBRECT1.OUTtoplotis,is1,is3andis5.Superimposethedistortioncurrentcomponentidistortion=is-is1ontheaboveplot.

Answer:

is,is1,is3andis5waveform

Is:

Is1

Is3

Is5

Is-Is1waveform

Allwaveforms:

4.CalculateIcap（thermscurrentthoughthefiltercapacitor）asaratiooftheaverageloadcurrentIload.

5,Plotthecurrentandvoltageassociatedwithoneofthediodes,forexample,d1,and

obtaintheaverageandthermsvaluesofthecurrentasaratiooftheaverageload

current.

D1voltage

D1current

AveraAverageD1currentasaratiooftheaverageloadcurrent

D1,thermsvaluesofthecurrentasaratiooftheaverageloadcurrent.

6,VaryLsasaparametertoinvestigateitsinfluenceontheinputdisplacementpowerfactor,theinputpowerfactor,%THD,andthepeak-peakrippleinthedcvoltagevd.

Ls=1mh

DPF=COS（-9.959）=0.985;THD=8.906256E+01PERCENT（THD=0.8906256）;

PF

==0.7356;

Vd=

Ls=1mh

DPF=COS（-17.60）=0.953;THD=7.219879E+01PERCENT（THD=0.7219879）;

PF=

=0.773

Vd=

Ls=3mh

DPF=COS（-21.98）=0.9273;THD=6.303744E+01PERCENT（THD=0.6303744）

PF=

=0.784

Vd=

7,VarythefiltercapacitorCdtoinvestigateitsinfluenceonthepercentagerippleinvd,inputdisplacementpowerfactorand%THD.Plotthepercentage∆Vd（peak-to-peak）/Vd（average）asafunctionofCd

whenweincreasethevalueoffiltercapacitorCd,wewillseethethepercentagerippleinvddecrease.

whenweincreasethevalueoffiltercapacitorCd,wewillseethethepercentagerippleininputdisplacementpowerfactordecrease.

PHASE（DEG）DPF=COSPHASE（DEG）

-9.959E+000.985

-1.627E+010.960

-1.811E+010.950

-1.896E+010.946

-1.946E+010.942

whenweincreasethevalueoffiltercapacitorCd,wewillseethethepercentageripplein%THDdecrease.

%THD

8.906256E+01PERCENT

8.491219E+01PERCENT

8.351652E+01PERCENT

8.284880E+01PERCENT

8.240134E+01PERCENT

Plotthepercentage∆Vd（peak-to-peak）/Vd（average）asafunctionofCd

8,Varytheloadpowertoinvestigateitsinfluenceontheaveragedcvoltage.

averageVdvoltage.

9,Inthenominalcircuitinputfile,removethelimitonthemaximumtimestepduringthesimulationandobserveitsinfluenceonthecircuitwaveforms.

Answer:

Whenweremovethelimitonthemaximumtimestep,weseethewaveforms

Vs:

Isbeforeremove

Isafterremove

Vd:

10,Obtainthevs,isandvdwaveformsduringthestartuptransientwhenthefiltercapacitorisinitiallynotcharged.Obtainthepeakinrushcurrentasaratioofthepeakcurrentinsteadystate.Varytheswitchinginstantbysimplyvaryingthephaseangleθofthesourcevs.

（1）,whenthefiltercapacitorisinitiallynotcharged.

Vs

Is

Vd

（2）thepeakinrushcurrentasaratioofthepeakcurrentinsteadystate

Thepeakinrushcurrentis110A,whilethepeakcurrentinsteadystateis35A,sotheresultis3.14

（3）Varytheswitchinginstantbysimplyvaryingthephaseangleθofthesourcevs,forexample,thephaseangleischangedto30degree

Vs

Icd

Vd

11,ReplacethedcsideofthediodebridgebyacurrentsourceId=10A,corresponding

toaverylargeLd.MakeLsalmostequaltozero.ObtainVd（average）.

Answer:

wereplacethedcsideofthediodebridgebyacurrentsourceId=10A,andchangethevalueofLd

Is1000mH,morelargerthantheLs,soVd（average）is

12,MakeLs=3mHinProblem10andobtainVd（average）,displacementpowerfactor,

powerfactor,%THD,andthecurrentcommutationinterval.

Answer:

（1）whenLs=3mH,andthefiltercapacitorisinitiallynotcharged.Weobtainthevs,is

andvdwaveformsduringthestartuptransient

Vs

Is

thepeakinrushcurrentasaratioofthepeakcurrentinsteadystate

Thepeakinrushcurrentis83A,whilethepeakcurrentinsteadystateis16A,sotheresultis5.19

Vd（average）

（2）DPF=COS（-2.199E+01）=0.927

（3）PF=

=0.780

（4）%THD=6.426583E+01PERCENT=0.6426583

（5）thecurrentcommutationinterval.

Id1waveformis,sothecurrentcommutationinterval.is12ms.