恒压变频供水实习日志 2文档格式.docx

恒压变频供水实习日志 2文档格式.docx

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电气系

专业：

电气工程及其自动化

班级：

电控071

姓名：

贾旭

学号：

2007308112

外文出处：

附件：

1、外文原文；

2、外文资料翻译译文。

指导教师评语：

签字：

年月日

1、外文原文

DriveinWaterSupplySystem

Abstract:

Thisdesignuses"

morethanawaterpumpconvertercontrol,"

themulti-pumpcontrolsystem.HeretheusePLCtodesignafrequencycontrolwatersupplysystem,whichthenetworkcanautomaticallyadjusttheinstantaneouspressurechangesthespeedofawaterpumpandpumpmorethanoneinputandexit,sothattheoutletpipenetworkbackbonetokeepinconstantthesetpressurevalue,andmeettheuser'

sflowrequirements,sothatthewholesystemisalwaysbesttokeepenergyefficient.Constantpressurevariablecanberealized,twoothercontrolvariablesconstant,avarietyofstart-stopcontrolmode,thesystemcanmodifytheparametersofanycommand（suchasthepressuresetting,thecontrolorder,controlthemotornumber,thepressureonthelowerlimit,PIDvalues,accelerationanddecelerationtime）;

hasacompleteelectricalsafetyprotectionmeasures,overcurrent,overvoltage,undervoltage,overload,withoutwaterandsocanself-diagnosisandfaultalarm.

Toensurenormalwatersupplyarea,theuseofPLCcontrolfrequencycontrolwatersupplysystem,accordingtotheneedsofuserson-demandwaterpumpflowadjustment,accordingtolesswateratnightcanonlyopenasmallflowpump,andtomeettrafficdemandsofusers,sotruealwaysmaintainasystemofenergy-efficientbest.

Keywords:

InverterWaterSupplyPLC

Body:

Withtherapidsocialandeconomicdevelopment,urbanconstructionexpandingthesizeofthepopulationincreaseandrisinglivingstandardsofurbanwatersupplyquantity,quality,stability,higherandhigherrequirements.SmallandmediumcitiesinChina,especiallytheoldwaterplantwaterplantautomaticcontrolsystemconfigurationisrelativelybackward,thecontrolunitdependsondutypersonnelmanual.Controlprocesscumbersome,butcannotmanuallycontrolthepressureofthewatersupplynetworkandwaterlevelchangesinatimelymannertorespondappropriately.Toensurethewatersupply,ofteninover-pressureconditionunitrunning,notonlylowefficiency,powerconsumption,andalongperiodofChengshiguanwangoverpressurerunning,exposureisalsoveryseriousloss[7],constantpressurewatersupplysystemsarebecomingincreasinglypopular.

1.CharacteristicsofWaterSupply

WaterSupplyreferstotheamountofwaterregardlessofthesizeoftheusersegment,thetotalalmostconstantpressuretomaintainthenetwork,sothateachpartcanmeetthedemandforwaterusers,notthemotoridling,resultinginenergywaste.

（1）energyefficient

Asaresultofconstantpressurevariable,thevariabletransformersupplysystem,waterpumpstationnumberandspeedofopeningisautomaticallyadjustedaccordingtowaterthesizeoftheirown,butalsowithasmallpumptopumpalargewaterpeakatnighttostopworkingautomatically,sothatthesmallpumpautomaticallyputintooperationmaintainthepipenetworkpressure,soenergyefficiency,energysavingthantheconventional20%-45%water.Heatflow,shortcircuitprotection,softstartpumpmotorfromthepower,noinrushcurrent.Asaresultofcomputercontrol,equipment,automaticoperationwithoutduty.

（2）operationmanagementissimple,highdegreeofautomation

Alowwaterlevelorpumpfunctionautomaticallystops,usinghigh-qualityfrequencycontroldevices,overvoltage,overvoltage,undervoltage,overload,overcurrentprotection

2.FrequencyWaterSupplydescribestheadjustmentprocesstechnology

Switchingthestartofpump,ifthehardware,software,werenospare（bothhardwarepriorityisvalid）,1#startthepumpfrequency,thefrequencyincreasedwithspeedfromthebeginning,suchastheinverterfrequencytoarriveatatimewhenpressureisstilllowerlimit,delaytime（timerelayfromtheinternalcontrolistoavoidtheinterferencecausedbymalfunction）,the1#toswitchtothepumpfrequencyoperation,whilethefrequencyconvertertotheslidingstop,2#pumpfrequencyconversionsuchasthewaterpressureisstillnotsatisfied,theninturnstartthe3#,4#pump;

ifthestandbypumpstart#1,Kai2#frequencydirectly,thespeedincreasedfrom0withfrequency,suchastheinverterfrequencytoreach,atwhichpointthewaterpressureisstilllowerlimit,delaytime,2#runthepumpswitchtothefrequency,whilethefrequencyconvertertotheslidingstop,3#pumpfrequencyconversion,suchasthewaterpressureisstillnotsatisfied,start4#pump;

ifa#,2#pumpsarestandby,thedirectconversionofKai#3,thespecificprocessandthepumpsimilartotheswitch.

Similarly,ifwaterpressureintheupperlimit,ifthe3pumps（assumedtobe1#,2#and3#）,running,runningdownto3#pumpfrequency,whenwaterpressureisstillattheupperlimit,thenaftersometimedelayStopthepump1#3#pumpdrivefrequencyfromrisingrapidly,ifthesubsequentpressureisstillattheupperlimit,thedelayperiodoftimetostopthepump#2.Thistransitionprocess,whicheffectivelyreducethefrequencyofthepumpstartandstop,whiletheactualpipenetworktorespondtothepressurefluctuationspriortoadjustquicklyfromthedrivetomakeasmoothtransitionpressure.Thepast,constantpressurewatersupplysysteminthehighpressure,usuallybystoppingpump,thentheinverterfrequencyoperationmodetoswitchtothefrequencyisrunthepumptobeadjusted.Thisswitchmeans,intheory,cutthefrequencythanthedirectwayadvanced,buteasilyleadtofrequentpumpstartandstop,thusreducingthelifeoftheequipment.Andwedesignedthissystem,fordirectsuspensionfrequencypump,whiletherapidadjustmentbythefrequency,aslongastheappropriateparametersettings,youcanachievetheimpactofpump-freeswitching,sothatasmoothtransitionpressureiseffectivetopreventpressurelarge-scalefluctuationsandlowwaterpressurewhentheshort-termwatershortagesandimprovewaterquality

3.Thebasicprincipleoffrequencyconversionwatersupply

Atpresent,thefrequencycontrolinpotablewaterapplicationsinthebuildingtothewatermorewidely,mainlydueto:

（1）Frequencyofwatersupplywaterpressureadjustable,youcaneasilymeettheneedsofavarietyofwaterpressure.Inthedesignstagecanreducethecalculationaccuracyofthewaterpressurerequirements,becauseanytimeyoucaneasilychangethewaterpressure.However,shouldpayattentiontoselectingapump,thepumpheadshouldbelarger,becausethefrequencycontrollimitsthemaximumpressurebythepump.Minimumoperatingpressureshouldnotbetoosmall,becausethepumpdoesnotallowhighflowatlowliftlong-termoverloadofwork,orshouldincreasethecapacityofthedriveandpumpmotorstopreventoverload.

（2）Atpresent,theinvertertechnologyisverymatureinthemarket,therearemanydomesticandforeignbrandsofconverter,whichprovidedforthefrequencycontrolwatersupplysufficienttechnicalandmaterialbasis.Inverterhasbeenwidelyusedinvariousdepartmentsinthenationaleconomy.Anybrandofdrivecontrollerandfrequencyofwatersupplywith,youcanachievemoreconstantpressurewatersupplypumpsinparallel.Widelyusedaswatersupplybuildings,somedrivemanufacturerstodesignthecontrollerdirectlytodointhefrequencyofwatersupplyinverterwatersupplysystem;

Thisdrivehasgoodreliability,easeofuseadvantages.

（3）frequencycontrolwatersupplywithexcellentenergysavingeffect.

Bythepump-theprincipleknowntopipedwater,regulatingwaterflow,inprinciple,twoways;

firstthrottle,openingalargewatersupplyvalve,theflowincreased;

offasmallwatersupplyvalve,theflowdecreased.Thesecondmethodistoadjusttheflowspeedadjustment,thepumpspeedincreases,waterflowincreases;

speeddropped,theflowdecreased,thewaterflowisconstantlychangingsituations（suchaswater）,adjusttheflowwithspeed,withexcellentenergy-savingeffect.NationalScienceandTechnologyCommissionandtheStateEconomicandTradeCommissionofChina,"

ChinaEnergyTechnologyPolicy"

inthepumpandfanspeedcontroltechnologyastheNationalNinthFive-YearPlanfocusedonthepromotionofenergy-savingtechnologyprojects.Shouldbenotedthattheeffectofconstantpressurewatersupplymainlydependsonenergy-savingchangesinwaterflowandpumpareasonableoption,inorderforconstantpressurewatersupplywithexcellentenergysavingeffect,constantpressurewatersupplyshouldbeusedmorewaterpumpsinparallelmode.Constantpressurebyanumberofpumpsinparallelmulti-invertersupplytheoryshowsthatconstantpressurewatersupplypumpsinparallel,aslongasoneofthepumpisthepump,therestisthepumpfrequencycanbeachievedconstantpressurevariablewatersupply.WaterConstantPressurevariableamongthepumpflowisvaried,whenthepumpisthelargestoftheparallelpumps,constantpressurewatersupplycanbeguaranteed.

Moreconstantpressurewatersupplypumpsinparallel,thedesigncanbeachievedundertheconstantpressurepumpefficiencyofthefrequencychange（duetothesameconditions）,andmakeitworkinhighefficiencyarea,pumpflowischanging,itsefficiencywiththeflowratechange.Pumpsinparallelbecauseofmulti-pressurewatersupply,reducethepumppower,whichcanreducethemulti-pumpsysteminparallelconstantpressurewatersupplyenergy,improveenergysituation.

Whenmultiplepumpsinparallelwithautomaticconstantpressurewatersupplysystemusesthesleepfunctionoftheinverter,whenthewaterflowis