外文翻译--制冷压缩机速度的模糊控制.doc

中文译文FuzzycontroloftherefrigerationcompressorspeedAbstractInthisarticle,mentionisusuallyappliedtocommercialvapor-compressionrefrigerationinstalled,usingfuzzycontrolalgorithmtocontrolthespeedoftherefrigerationcompressorsoastoachievethemostefficientspeedtocontrolthetemperatureoftheairconditioning.Itsmainobjectiveisaccordingtothefuzzycontrolalgorithm,acontinuousregulationofthecompressorspeedbytheconverter,andtoestimatetheenergysavingeffect；unliketraditionalthermostaticallycontrolled,bycontrollingtherefrigeratingcapacityofthecompressor,isappliedtothecontroltheswitchingoperationfrequencyofthecompressor50Hz.Controlthesupplycurrentofthemotorofthecompressorreachesthespeedchangerangeis30-50Hz,lubricationproblemsduetotherotationalfrequencyistoolowtherewillbearesultofasplashsystemappearstodayareprovidedontherotationalfrequencyofthecompressorisgenerallynotconsideredlessthan30Hz.CanreplaceR22inthisrange,thetwomostappropriateamongtheworkingfluid,therearemany,suchasR407C(R32/R125/R134a23/25/52%group)andR507(groupR125/R143A50/50%)good.Compressorspeedfuzzycontrolcomparedtotraditionaltemperaturecontrolforrefrigerationandcoolingsystems.ExperimentalresultsshowthatwhentheR407Castheworkingfluid,canachievesignificantenergysavings(13%).Itisnoteworthythat,fromenergypointofviewthebestresultscanbeachievedwhenthechangeofthecompressorspeed.Inaddition,takingintoaccounttheconvertercosts,paybackperiodthantheacceptablemodelsmoredecisive.Keywords:compressionsystem,coldchamber,pistoncompressors,variablespeed,articlesofassociation,FuzzyLogic,R407C,R5071.IntroductionVaporcompressioncoolingmeans,thoughdesignedtomeetthemaximumload,butinordertoprolonglife,usuallyworkingunderpartload,andthroughtheswitchingcycleregulation,operateatafrequencyof50Hz,andthusdeterminesthethermostaticcontroloftheenergyconsumption.Moreover,therefrigerantwhenlowpowerconsumptionisconsideredindirectreleaseofgreenhousegases；improvedtheenergyconversionefficiencyoftheabove-describedsystemcanreducesuchemissions.Avarietyofrefrigerationcapacitycontrolmethodandpartialloadtheorythatthecompressorspeedvariationisthemostefficienttechnology.Therefrigeratingcapacitycontrolmethodhasbeenanalyzedinthepast3-10years,includingimprovingthespeedofthecompressortoconstantlyachievethecoolingeffect.Theconvertercanbeusedforregulationofthecompressorspeed.Differenttypesofelectronicvariablespeeddrive,butthepulsewidthmodulationinverter(PWM)becauseofitslowcostandhighefficiencyismostapplicable.Refrigerationcapacityofsuchcontrolsusedincommercialcompressor,thoughontheenergy-savingadvantages,buttherearecertaindrawbackssuchasthecostoftheequipmentandcompressorlubricationandreliabilitytrouble.Thelastquestionis,Whenthethermalconverterofthesecondaryfluidinthegasphase,forexample,inthereviewplantisharmful.However,whenthesecondaryfluidintheliquidphasewhenitseemstobeadvantageous.Therefore,themainpurposeofthispaperistosetthecontrollertocontinuouslyregulatepumpcompressorandothersmallrefrigerationequipment.Suchcontrolallowsustoadjusttherefrigeratingcapacityofthecompressoratanytimetoobtainacoolingload,andthereforethecompressoroperationatotherfrequenciesmayalsobelessthan50Hz.Whentraditionaltemperaturecontrolforrefrigerationorothersmallrefrigerationsystem,thecompressorcanonlyworktodointhe50Hz.Inparticular,incontrasttothecommonlyusedvaporcompressioncoolingapparatusmentionedhereincanbeselectedaccordingtothefuzzylogiccontrolalgorithmintherefrigeratedtemperaturesthemostappropriatespeedofthecompressor.Inadditiontothefuzzylogic,thecompressorspeedcontrolmaybebyothertechnologiessuchastraditionalproportionindispensableandPIDcontrol.Inparticular,thefuzzylogiccontrol,comparePIDpermitbetteruseofexperimentalknowledgeandtakecontrollogicofanon-mathematicalmodelaccordingtothedeviceworkingconditions.Moreover,afuzzycontrollerPIDcontrolissometimesnecessarytohavecomparableorbetterworkinthespecifiedoperatingpoint.Inadditiontothementionedafuzzycontrollertoadjustthetimewhenthereisasuddenchangeinthecoolingloadonthefastbeatingsmallsignificantdynamicalcharacteristics；Thisoftenleadstoarobustcontrol.Therefore,theexperimentaltestguidancecomparedfactorycompressorcoolingcapacitycontrolsystem,fuzzyalgorithmanddeterminethecompressoron-offcycletraditionalovenoperatesatafrequencyof50Hz.Oftheworkingfluidtobetested,R407C(mainlyR32/R125/R134a23/25/52%)andR507(R125/isofR143a50/50%),R22ismostalternative.2pilotplantVaporcompressiontestdevice,asshowninFigure1showsageneral-purposecommercialequipmentiscomposedbythefollowingparts,aliquidreceiver,anaircondenser,transistorsandtwoexpansionvalves,athermostatisamanualrelyonthesupportfreezerinsideavaporcompressionwork.WantedamakerofsaidcompressorworkforavailabilitythefluidR22,R507andR407；polyesteroillubrication,anditsspeedregulatedbyPWMconverter.Andagroupofthree-phasevoltagerectifier,DC380V,50Hzandastraight-todepositathree-phaseACvoltageconverter；invertersadjustablevoltagefrequency.Withtwovalvesofthethreetubesmaytroublecanbesolved,becausewhenthevariationofthespeedofthecompressor,expansionvalvetheirworkisunknown.TheuseoftheexpansionvalveisspeciallydesignedforR407CandR507.R407andoperatingin50Hz,whenthetemperatureat-20to10°Cwhenthecapacityofthecondenserchangeswithin1.4-1.8kWrange.Afixedtemperatureinthecondenserandtheimitationofexternalconditions,inadecisionheatthechannelanditswind.Theregulatortemperaturecontrolresistorcanbedetermined.Insomeexperimentalteststosimulatetheregulatorelectricheatingrefrigerationload,voltageandpowermeasurements.Table1liststhespecificationsoftheconversionapparatus.Thetestharnessisequippedwith32-bitA/Dcardconnectedtothepersonalcomputer,ithasahighsamplingrateandbytheconversiondevicesimulationresults.DatacollectionsoftwareinLabVIEWenvironmenthasbeenachieved,andthroughabalanceofenergyandradiationsoftwareevaluationofthethermodynamicpropertiesofR407CandR507.3experimentaldescriptionToassesstheperformanceoftheproductwhenused,itisnecessarytocompareat50Hzbyswitchingcycleregulationandcontrolledbythefuzzyalgorithmenergyconsumption.Inexperimentaltests,theloadingofdifferenttypesofcoolinghavebeenconsidered.Firstofall,whenthedoorofrefrigerationperiodicallyswitchandinevitableandoutdoorairheatexchangeexperimenthasbeenachieved.Theseexperimentshavebeentestedinawiderangeoftemperaturetocompletetheopenrefrigeratordoors5minutesevery20minutesandwhentheoutsidetemperatureis18.8C,thecoldstoragetemperaturethusobtainedisgoodin5.0to25.8C.Inaddition,insomeofthetestsinthecoolingloadcanbeobtainedbytheelectricheaterlocatedintherefrigeratorcompartmentcanbecontrolled,whileinotherteststherealcoolingloadisconsideredtobe200kgFruitsandVegetables5.8Ccansave.Inthefirsttwocaseevery10minutestoopentherefrigerateddoortomimictherealworkenvironment；Moreover,theexperimentscarriedoutinthewinterandsummertest.Insummertestsinheatingelectricheatingbuttheoutsideofthecondenserismaintainedatatemperatureof32.8C,andinwinter,theoutdoorairtemperatureismaintainedat108C.Experimentalresultsmainlyreflectthepowerconsumption,goodpowerenergymeterstomeasuretheenergy-savingeffectassessmentbe.ThelasttwodaysofthetesthasbeenachievedR407CandR507.ThecompressorspeedcontrolfuzzylogicFuzzylogiconbehalfallowsustogetinformationfromvague,ambiguousoruncertainanswermethodologyisdefined.Theconclusionscanbefoundtobedefinedstartingfromtheproximityoftheinformationanddataforthefuzzyprocessisverysimilartothatofthehumanbrain.Incontrasttotheclassicallogicmethoddepictthephenomenonofmathematicalmodelequationsthatrequireaprecisedefinition,fuzzylogicallowsustosolvetheproblemofclearlydefined,andforwhichitisdifficult,ifnotimpossible,todetermineanexactmathematicalmodel.Therefore,theexperienceandknowledgeofsuchshapeisnecessary.Inparticular,fuzzylogicisnonlinearcontrolanswertoyourquestion,alegitimatechoice.Infactnon-linearadoptrulesrelatingtothemembershiproleandreasoningprocessistreatedtoensureeasierimplementationandsmalldesignfee.Inthecontrolperformance,thedisadvantagesoftheothersideofthelinearapproximationofanonlinearmodelissimpleenough,butithaslimitationsandmayoccurinsomecasesexpensive.Moreover,thefuzzycontrollerisrobustandallowsustoexperiencethroughtheuseofotherrulesormembershiproleinaverysimplewaytoimproveorchange.Manyexamplesoffuzzycontrolcanbefoundinsomerecentapplications.Inparticular,intheheatingventilationandairconditioningindustrythereisawidevarietyofapplicationoffuzzycontroloftemperatureandmoisture.Afuzzycontrollerdesignrequiresthreefundamentalstages.Thefirstistoestablishtheinputandoutputvariables.Thesecondistodefinetheinputandoutputvariablesmembershiprole.Thelastofwhichistheselectionorformulaiccontrolrules.Themainobjectiveofthispaperistodetermineafuzzycontrollerisabletoregulatetheelectriccompressormotortrendofthesupplyfrequency.BlockdiagraminFigure2commercialavalaiblerefrigeratedtemperaturefuzzycontrolprocessreports.Inparticular,thefigureshowsatwo-inputfuzzycontroller.Inputvariablesintheadjustmentpointtemperatureandairtemperaturebetweenthetemperaturedifferenceincoldstorage(T),ANDthetemperaturedifferencebetweenderivativesandtime(d(T)/dt).Fuzzyoutputvariableisthefrequencyofthecompressormotor(f)thesupplytrend；fuzzylogicinaccordancewiththedeterminationofthepossiblevaluerepresentingvariablesofthefuzzyset.Traditionalfuzzylogictheorytheory,elementsmaybelongornotaparticularcollection,partofthemembershipallowstheelementsofthecollection.Eachvalueofthevariablesischaracterizedbychangeandcontinuityfromzerotoavalueofmembership.Therefore,itisdefinedtoestablishthemembershipofvariablerateispossibleinwhicheachofacollectionofvolatilemembershiprole.Fromaneffectivepointofview,thefuzzycontrollertoacceptthevalueoftheinputvariable,forsomeoperationsandtodeterminethevalueoftheproduct.Thisprocessischaracterizedbythreemainphases；fuzzycontrolinferencemechanismsandfuzzyoperation.Permittedtotransformthevalueisdefinedasthevalueoffuzzyfuzzyarithmeticprocess；inferenceprocesstodeterminethefuzzyrulestobefixedaccordingtotheexperimentalreality；allowedtotransformvagueabouttheprocessoffuzzycontrolintoadefinedvalue.Thefuzzylogicofthemajordifficultieswithspecificexperiencenecessarybuildingdesignandafuzzycontrollerconnection.Accordingly,astheregulationoftheparametersofsomeexperimentalthinkwesetthetheexchangecompressorspeedcontrolvariable.Theexactrulesandspecialqualificationschoiceofappropriatechangecontroller.However,itwillbeconsideredfromtheenergysavingpointofviewitisconvenienttocontrolthespeedofthecompressor,becauseitworkstoalowerfrequency,butinthiscasewhentherequiredtemperatureoftheadjustmentpointwillbethemainandthetimenecessarytocompare,whenthecompressionmachinerunninga50Hznominalfrequency.Therefore,itmaysometimeshappenthat,evenwhenthecompressoroperationfrequencylowerthanthenominalenergysavingmaybepartiallyobtained,indeedbecausethecompressortooperateatlowerfrequencies,butinmanymoments.Accordingly,inordertoregulatetheworkingtimeofthecompressorinordertolowerthefrequencyisimportant,whenthemembershipoftherolewillbedefinedbytheinputandoutputvariablesofthefuzzyalgorithm,selectthesubsetofdigits,anditswidthmustbeappropriate,andBootfromtheexperimentalknowledge.Similarconsiderationsaboutthechoiceofrulesisneeded.End,theproposedalgorithmmembershiprolesandrulesofexperimentallyverified.Table2showsafixed