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毕业设计论文翻译资料信息与电子工程系工业电气自动化专业04级1班课题名称S7200PLC控制的变频调速恒压供水系统设计毕业设计论文起止时间2007年3月1日~6月10日共17周学生姓名赵晋学号3040221123指导教师黄云龙、朱秋琴、廖东进报告日期200731浙江工业大学浙西分校信息与电子工程系毕业设计(翻译资料)EnglishPart1ThecontrolandEnergysavingofautomaticWaterSupplySystemAbstractBasedonesimpleanalysisofthemethodsforwatersupplyuseddomesticallyandabroad,thispaperdiscussestheprincipeandsystemsstructureofautomaticwatersupplysystembyusingfrequencyconversionspeedregulationindetail.Thenthesystemsadvantagesarediscussedandsomekeyproblemsthatshouldbepayattentiontodesigningarepresented.KeywordFrequencyconversionspeedregulationwatersupplywithstablepressurePIDregulator.1、ForewordAtpresent,supplywaterinresidentialareaandlifeoftheskyscraperofourcountrygenerallyadoptthewaycommonfrequently.Ithasheavyenergyconsumption,highnoise,andtherehasagreatdealofquestionsinthesourceofwater,suchassecondarypollutionetc.Anditisakindofcomparativelyidealmodetoadjustthewatersupplydevicecontrolledrapidlywithfrequencyconversion.Enteringthemiddleandlaterperiodsofthe1990s,asthespeedtechnologyoffrequencyconversionachievesmoredevelopmentbecomesperfect,thewayofthefullautomaticconstantpressurethatbasedonthistechnologysuppliedwaterhasalreadybeenwidelyusedinthedevelopedcountry,andisbecomingriper.Inrecentyears,authorhasmadesomerealworkonrapidlytothetransformationinfrequencyconversionsupplywaterdesignandconstructionofcontrolsystem,haveaccumulatedsomeexperience,andhasformedtheviewonsomequestions.Thereasonwhytheenergyconservingprinciplefrequencyconversionofthewaterpumpsystemofspeedadjustmentbecomespopularized,ismainlybecausethatithasabetterenergyconservingresult.Topumpsystemoffrequencyconversion,thewaterpumpafteradjustingthespeedhasfunctionalrelationofthefollowingQ1/Q2n1/n21H1/H2n1/n222ofthetype.Q1,Q2representstheflowbeforeandafterthespeedforthewaterpumprespectivelyN1,n2representstherotationalspeedbeforeandafterthespeedforthewaterpumprespectivelyH1,H2representstheliftbeforeandafterthespeedforthewaterpumprespectively.AccordingtheaboveH1/H2f1/f22Namelyrealliftofawaterpumpispowerthesquareoffrequencyindirectradio.Thereforechangingthepowersupplyfrequencyoftheelectricalmachineryofwaterpumpthroughthefrequencyconverter,cancontrolsupportingwaterpressurestrengthofthewaterpump.2constantpressureasFig.1showssupplywateroftheautomaticallycontrolledfrequencyconversionwatersupplysystemprincipleblockdiagram.P1isthegivepressurevalue,p2fortheactualpressurevaluehadexaminedfromthepipelineofthepressuresensor,PIDregulatorpassestheerroroperationofthetwovalue,andthroughcontrollingthefrequencyoutputofthefrequencyconverter,thusmakethepressureofthepipelineremainthroughoutonestablishingvaluep1.Thissystemcanmeasureusersinstantaneouswaterpressureadjustautomatically,regulatetheamountofquantityofsupplyingwaterandoperationconditionsoftheelectricalmachineryinviewoftheabove.Canaccordingtogivewaterpressurestrengthtosetforandcontrolpressurevaluewhichneeded,maketheequipmentintheconstantpressurestateallthetime,canknowfromloadcharacteristicofelectrical浙江工业大学浙西分校信息与电子工程系毕业设计(翻译资料)EnglishPart2machineryaxlepoweranditsthethirdpowerofindirectradiorotationalspeedofelectricalmachinerymixed,thatisp1/p2n1/n23.Forexample,asthefrequencyconverteroutputfrequencyfor35Hzestablishas50Hzatmost,thatistosaythattheactualrotationalspeedis70oclockofspecifiedrotationalspeed,thepowerconsumptionofthegovernoris0.730.343,accountforspecified35.Thatistosay,thewaterpumpisalwaysinconstantpressureandturntheworkingstateofmatchingthewayintotheflow,isitisitkeeptoexceedtodispelandbacksetcurrenthaveworkloss.ConstantspeedtransferwithfrequencyconversionspeedaxlepowerchangecurveasFig.2shows,relativelycanknow,itisthemostobviousthatfrequencyconversionadjuststheenergyconservingresultofspeedway.2、CaseanalyseConstantpressureisitregulateflowofwatertothepurposetouptoconstantpressurethroughsuitingwellrapidlyinfrequencyconversiontosupplywater,thegoalthatitcontrolsfinallyisthewaterpressure.Controllingthetargethasnonlinear,laggingcharacteristics.ThequalityofPIDregulatorperformance,hasdeterminedthequalityofthewatersupplysystemtoagreatextentWhenthesystemisduringthecourseofstartingandstopping,orthepressureestablishingvaluechangesbyalargemargin,becausethereisaverygreatdeviationwithinshorttime,nomatterthecontrollalgorithmofPIDregulatoradoptstheincrementtypeorthepositiontype,itstotalmarkonewillfetchthecistern,waterpumpgroup1M,2Mandcomplementthefittingstoformrelevantly.Thecoreofthissystemisthatfrequencyconversionadjuststhespeedswitchboard,itmonitorsthepressureofthepipenetworkinrealtimethroughthepressuresensor,andchangeintotheelectricsignalandofferthefrequencyconvertertotomakeoperation,throughthecontrollingcommonlyoffrequencyconverter,programmablecontrollerPLCandrelayarray,adjustthesystemofsupplyingwaterrapidlyafterformingperfectfullautomaticfrequencyconversion.Frequencyconverterisvariousinkind,forinstancethetypes,suchasMitsubishi,Fuji,threeKenyaandABB,etc..Generallyoftenselectthepumps,specialpurposeseriesofairblowerforuse.WhethertakeMitsubishiFRA140Easanexample,itexceptgeneralfunctionhadofbrand,therearethefollowingcharacteristicsTheinsideadoptstheintellectualpowermoduleofIPM,itislowesttomakethenoiseoftheelectricalmachinerytoreduceFrequencyconverter,andworkfrequencypowercanisitswitchovertogoonfrequently,userisitisitstart,stopthroughPLCandswitchovertheorderautomaticallytoinputtoneedonly,canconvenientlythroughtolockmovementswitchoverdifferentwaterpumpeachothercontactor,anddoesnotneedtodesignthetediouscontrolprocedurebyoneselflikethethingthatinthepast,thisisoneofthispeculiarfunctionsoffrequencyconverterBuiltininstantaneouspowercutstartsandretriesandstartsthefunction,inasituationthatnobodyguarded,evenifcanbestartedbyoneselfafterthefrequencyconvertershutsdown,totallyrealizewiththeoperationoftheautomaticway.PIDregulatoravailablefrequencyconverterofsystemthisbuiltinvalueveryheavy,thiswillstoredeviationinregulate.Duringtheprocessofdispellingthedeviationtoregulate,mustleadtothefactthesystemandpresentgreaterultramediationlongtimevibration,canproducetheseriousintegrationsaturationphenomenonalsoatthesametime,thusinfluencethe浙江工业大学浙西分校信息与电子工程系毕业设计(翻译资料)EnglishPart3normalrunningoftheequipment.Isitdroptheinfluencetomostlowtowant,shouldadoptPIDcontrolmethodthatintegrationseparateamongcontrollingalgorithm,inordertoreachtheanticipatedresult.Afterdealingwithlikethis,canshortenthesystemandreachsteadytransitioncoursetimegreatlySystemallocatetwo11kWwaterpumpsupport600overresidentwater.Twopumpofferlargepeakflowmostwhenworkingatthesametime,singleplatformmeetthesmallflowandsupplywateratnight.Inadditionallwaterpumpcanrunbywayoffrequencyconversion,cancirculatewaysofttostart,inthisway,canreducetheimpacttotheelectricwirenettingandpipenetwork.Whatmeritsattentionistwopumpwhenfrequencyconversionandworkerareswitchedoverfrequently,haveprocedureitlockstobeenougheachotheronly,outputtingmustadoptmachinerytointerlockthecontactor,canavoidthesituationthattwocontactorscloseatthesametimeinthetwinklingofaneyeinthisway,soasnottoshortoutintwinklingofaneyecausingpower.pressuresensorPmonitorsthesizeofthewaterpressuresignalinrealtime,thesignalisdealtwithbyPID,inputittothefrequencyconverter.Atthesmallflow,waterpumpelectricalmachinery1Mturnroundwhether1KM1isitshuttosuck,andthroughfeedbackpasswordchangehisrotationalspeedconstantly,itisinvariableinordertokeepthepressureIncaseoflargeflow,comparefrequencyconversionbypressurecircuitsendoutthroughPLCconstant/changedswitchoverfrequentlyoperateandinterlocktheorder,machineryinterlocksthecontactor2KM2in2KM2KM12KM2,contactor3KMhavetheelectricity.Atthismoment,electricalmachinery2Misstartedbywayoffrequencyconversion,1Misswitchedoverandrunatfullspeedfrequentlytorun.Inthisway,thissystemcanmaintainwaterconsumptiononainvariablepressureallthetime.Builtupintheaforesaiddistrictinitialstage,supplywaterandadoptthewayfrequentlyofworkers,becauseofenergyconsumptionbeingheavydependabilityisbad,thehouseholdreflectsstrongly.Useinsteadafterfrequencyconversionsupplywater,installationtotalcapacityreduce25thanoriginalequipment,economizeonelectricitytheindexisclose30syntheticallyactually,theresultisremarkable.3、SeveralquestionswhileapplyareincaseofgreatmajorityTheenvironmentforuseofthesceneiscomparativelyabominable.Thoughfrequencyconverterhasverystrongprotectionfunctionsitself,suchasowekeep,excessivepressure,isitflowtopass,electriccurrentamplitudelimitingisitmakeexactlytochoose,overload,overheatedlackinglooking,shortingoutanddisconnectedinkprotectthefunctionButmustpreventtroublebeforeithappens.Throughusingfinding,twokindsofbrandsofMitsubishi,Fuji,becausehasfullyconsideredvariouskindsofabominablerunningenvironmentindesignandmanufacture.Thedependabilityandservicelifeunderthesameconditionarehigherthansomebrands.OnesmallcityofmountainareaofwestplaceinHubeiinHubei,average1200mabovesealevel,thehumidityonthehighsideoflongtermmostofthetimeabout80,thesulfurdioxideisseriouslypolluted,asetoffrequencyconversionthatonefactoryproducessupplieswateroftheequipment,becausehasnotconsideredabovementionedfactors,lessthanoneyear,therelevantpartsoftheequipmentarecorrodedseriously.Andthelikeproductwhichwedesigned,installed
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