有源电力滤波器英文文献和中文翻译.doc

有源电力滤波器英文文献和中文翻译.doc

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附录一：

英文文献

A10KVShuntHybridActiveFilterforaPowerDistribution

System

Abstract—thispaperanalyzesthecompensationperformanceofashunthybridactivepowerfilter.Thehybridactivepowerfilter,whichcombinespassivefilterandactivepowerfilter,hasbothrespectivemerits,andisanimportantdevelopingtrendoffilteringdevice.Thehybridactivepowerfiltercanreducethecapacityofactivepowerfiltereffectivelyandismoresuitablefortheengineeringapplicationforhighvoltagenonlinearloads.Thecompensationperformanceofhybridactivepowerfilterisanalyzedbyestimatingtheeffectofdifferentactivepowerfiltergainandparameterschange.Then,aconclusionhasbeenobtainedthattheharmonicattenuationrateisinsensitivetothevariationofpassiveparameterswhentheactivepowerfilterwithanenoughfeedbackgainiscombined.Finally,thefeasibilityandvalidityofproposedschemeisverifiedbySimulationusingMatlabandahybridshuntactivepowerfilterprototype.

IndexTerms:

Currentharmonicscompensation,activepowerfilter,passivefilter,generalizedintegrators.

I.INTRODUCTION

Inthedevelopmentofpowerelectronicsbringsconveniencetoenergyconversionandutilizationandalsocausespowerqualityproblems.Asoneofthekeytechnologiesincombatingpowergridpollutionandimprovingthepowerquality,activepowerfilter（APF）hasbecomeanewresearchemphasisinpowerelectronicstechnology[1]-[5].Becauseofhighinitialcost,thefurtherapplicationofactivepowerfilterisrestricted.TheHAPF（HybridActivePowerFilter）,combinationofAPFandpassivefilter（PF）,canreducethecapacityofAffectivelyandismoresuitablefortheengineeringapplicationofAPFforhighvoltagenonlinearloads.

Traditionally,Passivefilterhasbeenusedtoeliminatetheharmonicinpowersystemduetohislowcostandhighefficiency.Apassivefiltershowsthelowimpedanceattunedfrequencytoabsorbcurrentharmonicandhasagoodcompensationperformance.However,passivefilterhasthedisadvantageofdependingontheparametersofpowersystem,susceptibletotheloadandpowersystemresonantandthecharacteristicchangeduetoaging.Inaddition,passivefilterusuallyisdesignedwithfixedparameters,whichcannotbelightlyadaptedforthevariationoperationcondition.

Activepowerfilterhasbeendevelopedtoovercomeofdisadvantagesofpassivefilterandcanprovideflexibleandreliablecompensation,butisnotacost-effectivesolutionduetthehighoperationcost.

Becauseofthedrawbacksofpassivefilterandactivepowerfilter,theresearchonhybridactivepowerfilterhasbecomemoreattractive[6]-[9].Hybridactivepowerfiltercomposedofpassivefilterconnectedinseriestoanactivepowerfilterimprovesthecompensationperformanceofpassivefilterremarkably,givemoreflexibilityandreliabilitytofilterdevice,andredoundtotheuseofactivepowerfilterinhigh-powersystemavoidingtheexpensiveinitialcost.

Inthispaper,thecompensationperformanceofhybridactivepowerfilterinanindustrialpowerdistributionsystemisanalyzedbyestimatingtheeffectofdifferentactivepowerfiltergainandparameterschange.Finally,thecompensationofhybridactivepowerfilterisverifiedbysimulationandalaboratoryprototype.Thepassivefilterofprototypewastunedattheseventhharmonicandthegeneralizedintegratorsareusedtoeliminatethe5th,11thand13thharmoniccurrent[10].

II.PRINCIPLESOFCURRENTHARMONICCOMPENSATION

ThehybridactivepowerfiltertopologyisshowninFig.1,whichconsistsofathree-phasepulsewidthmodulation（PWM）voltage-sourceinverter（activepowerfilter,APF）andthepassivefilterconnectedinseriestoAPFthroughcouplingtransformer.Generally,theactivepowerfilteractsasacontrolledvoltagesourceandforcetheharmoniccurrentintothehybridactivepowerfilter.Theprincipleofoperationofcurrentharmonicisexplainedbythesingle-phaseequivalentcircuitshowninFig.2whenthefeedbackcontrolisappliedtotheactivepowerfilter.Inthecurrentharmoniccompensationstrategy,theactivepowerfilterisconsideredasacontrolledvoltagesourceVAPF,andZFistheimpedanceofpassivefilter,ILhistheloadharmoniccurrent,ZSisthesystemimpedance.

Inordertoeliminateharmonicofthesystemcurrent,theactivepowerfilteriscontrolledasacurrentcontrolledvoltagesource.TheactivepowerfilterimposesavoltagesignalVAPFthatforcesloadharmoniccurrentflowintothepassivefilter,thusimprovingitscompensationperformanceindespiteofthevariationinthetunedfrequencyofthepassivefilter.Thevoltagereferenceofactivepowerfilterisequalto

VAPF=K⋅Ish

（1）

Where,Kistheharmoniccompensationgain.Supposingutilityvoltageispuresinusoidal,therationbetweentheutilityharmoniccurrentandtheloadharmoniccurrentisobtained,whichcanbeusedtodenotethefilteringcharacteristicsofhybridactivepowerfilter.

Otherwise,KactsasaresistancetodampresonancebetweenZSandZF.ThelargerKisselected,thelowertheharmoniccontentsintheutilitycurrent.Butthiswillincreasetherequiredpowerratingoftheactivepowerfilter.Inrealcondition,Kisfinite.Otherwise,closedloopcontrolsystemwillbecomeunstable.

Fig.1hybridactivepowerfilterconfiguration.

Fig.2Single-phaseequivalentcircuitofthehybridactivepowerfilterscheme.

III.ANALYSISOFTHEHYBRIDFILTERPERFORMANCEINADISTRIBUTIONSYSTEM

Thissectionwillshowthecompensationperformanceofhybridactivepowerfilterthroughanexample.Thepowerdistributionenergizesthesixmediumfrequencyfurnace,eachof300KWratepower.Themediumfrequencyfurnacesenergizedbysixpulseuncontrolledrectifiers.ThesinglephasediagramofthepowerdistributionisshowninFig.3onlyconsideringhybridactivepowerfilterandmediumfrequencyfurnace.

Fig.3Single-phaselinediagramofthepowerdistributionsystem

ThesystemharmoniccontentandharmoniccriterionareshowninTableIandthe5th,7thand11thfrequencyharmonicsexceedthecriterion.So,thepassivefiltersaretunedatthe5th,7thand11thfrequencyharmonicandtherateofreactivepowercompensationis500kVar.ThesysteminductanceandtheparametersofpassivefiltersareshowninTableII.

TABLEI

POWERSYSTEMANDPASSIVEFILTERPAREMETERS

5th

7th

11th

Harmoniccontent（A）

62

28

14

Harmoniccriterion（A）

26.5

19.8

12.3

TABLEII

POWERSYSTEMANDPASSIVEFILTERPAREMETERS

L（mh）

C（uf）

R（mΩ）

KVAR

System

2.4

5thharm.filter

36.57

11.08

957

348

7thharm.filter

57.86

3.57

2120

112

11thharm.filter

66.46

1.26

3826

39.6

Inthiscase,therateofactivepowerfilteris25KVAsinceitwouldonlycompensatecurrentharmonicandthecouplingtransformersturnsratioisequalto2.

Fig.4（a）showstheharmonicattenuationrateofpassivefilterandhybridactivepowerfilter.Thehybridactivepowerfilterischaracterizedbyusingthreesingleresonantfiltertunedatthe5th,7thand11thharmonicfrequencyasshowninFig.3.Therefore,thepassivefilterpresentslowimpedanceatthe5th,7thand11thharmonicfrequencyandtheirneighborhood.Whennoactivepowerfilterisconnectedinserieswiththepassivefilter,theharmonicamplifyingphenomenonappearinthefrequencyrangeof200-240Hz,300-340Hzand500-640Hz.Whentheactivepowerfilterwithafeedbackgainof20iscombined,noharmonicamplifyingphenomenaoccurs.Meanwhile,onlyadaptingthepassivefilter,thefilteringcharacteristicisunsatisfactoryevenatthe5th,7thand11thharmonicfrequency.Whentheactivepowerfilterwithafeedbackgainof20iscombined,theharmonicattenuationrateisincreasedandthefilterperformanceofthehybridactivepowerfilterissatisfactoryatthe5th,7thand11thharmonicfrequency.

Fig.4（b）showstheharmoniccontentofpowersystemindifferentcondition.Whennofilterisconnectedinparallelwiththeutility,the5th,7thand11thharmoniccurrentexceedthecriterionseriously.Afteronlyadaptingthepassivefilter,theharmoniccurrentofutilityisweakenedbutunsatisfactoryadequately.Whentheactivepowerfilterwithafeedbackgainof20iscombined,mostof5th,7thand11thharmoniccurrentisforcedflowingintothehybridactivepowerfilter.

Fig.5showshowtheactivepowerfiltergainKchangestheharmonicattenuationrateofsystemcurrent.LargevalueofKimprovesthehybridactivepowerfiltercompensationperformancebyincreasetheharmonicimpedanceofpowersystem.

Inaddition,Fig.5showsthatthelowvaluesofpassivefilterqualityfactorQwillincreasestheimpedanceattheresonantfrequencyandweakenthecompensationperformanceofhybridactivepowerfilter.ThepassivefilterqualityfactorQdecidesthepassivefilterbandwidth.ThoughincreasingthevalueofactivepowerfiltergainKcancompensatetheadverseeffectoflowvalueofQ,whichwouldresultsintheincreaseofactivepowerfilteroutputvoltagerequiredtokeepthesamecompensationperformance,thusincreasingtheactivepowerfilterratedpower.

Fig.4HybridactivepowerfilterfrequencyresponseandHarmonicContent.

FromFig.5,aconclusioncanbereceivedthatthequalityfactorofpassivefilterandtheactivepowerfiltergaindirectlyaffectthecompensationperformanceofhybridactivepowerfilterwhenthetunedfrequencyisfixed.Ifthequalityfactorofpassivefilterisnotproperlyselected,theactivepowerfiltergainKmustbeenincreasedtoobtainthesatisfyingcompensationperformance.

Fig.5Hybridactivepowerfilterfrequencyresponsefordifferentvaluesofpassivefilterqual