恒压供水外文翻译.docx
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恒压供水外文翻译
外文文献原稿和译文
原稿
Thewatersupplysystemisthenationalproductionandlifeindispensableimportantoneannulus.Thetraditionalmethodofwatersupplyarea,waterpollution,infrastructureinvestment,butthemaindrawbackisthatwatercannotbekeptconstant,causingpartoftheequipmentcannotworknormally.VariablefrequencyspeedcontroltechnologyisanewmatureACmotorsteplessspeedregulatingtechnology,itsuniqueexcellentcontrolperformanceiswidelyappliedtothespeedcontrolfield,especiallyinwatersupplyindustry.Duetothesafetyinproductionandthewaterqualityofspecialneeds,forconstantpressurewatersupplywiththestringentrequirements,sothefrequencycontroltechnologyhasbeenmorein-depthapplication.Constantpressurewatersupplywaystoadvancedtechnology,constantpressure,convenientoperation,reliableoperation,energysaving,highdegreeofautomation,inpumpstationwatersupplycanperformthefollowingfunctions:
(1)tomaintainconstantpressure;
(2)thecontrolsystemcanbemanualorautomaticoperation;
(3)apluralityofpumpautomaticswitchoperation;
(4)systemofsleepandwake,whenpeoplestopwhenwater,thesystemisinasleepstate,untilthewaterdemandautomaticallywake;
(5)adjuststhePIDparametersonline;
(6)pumpunitandcircuitprotectiondetectionalarm,signaldisplay.
Theactualpressureofthepipenetworkfeedbackandagivenpressurewerecompared,whenthepressureofapipenetworkislow,increasetheoutputoffrequencyconverter,pumpspeedfaster,watersupplyquantityincreases,forcingthepipenetworkpressurerise.Vicepumpspeedslowdown,reducethewatersupplypipenetworkpressuredrop,,tokeeptheconstantpressurewatersupply.
Systemhardwarestructure
Systemusesapressuresensor,PLCandinverterasacentralcontroldevice,toachieveadesiredfunction.Source:
networktransmissionanddistributionequipmentinstallationinpipelinepressuresensor,fordetectingthewaterpressureofthepipenetwork,convertingpressureis4~20mAcurrentorvoltagesignalis0~10V,suppliedtotheinverter.
Converterpumpmotorcontroldevice,inaccordancewiththeconstantwaterpressureneedstobe0~50Hzfrequencysignalsupplypumpmotor,adjustitsspeedSAJconverterispowerful,i.e.pre-programmedsetparameterset,willusetherequiredintheprocessofsettingthenumberofparametersisreducedtoaminimum,defaultvalueaccordingtotheapplicationparameterofthemacrochoiceanddifferent.ThesystemadoptsthePIDcontrolapplicationmacro,closedloopcontrol.Inverterbasedonaconstantpressurecorrespondingtothevoltagesettingvalueandfromthepressuresensortoobtainthefeedbackcurrentsignal,theuseofPIDcontrolmacroautomaticallyadjust,changethefrequencyoutputvaluetoadjustthecontrolthespeedofthepumpmotor,toensurethatthepipenetworkpressureconstantrequirements.
Theapplicationofinverterintheconstantpressurewatersupply
一.Thecharacteristicandanalysisofvariablefrequencyspeedregulation
Thewaterusersingeneralisdynamic,sothewatersupplyisinsufficientorexcesswatersupplysituationhasoccurred.Thewatersupplyandtheimbalancebetweentheconcentratedreflectioninwatersupplypressure,namelywaterandwatersupplyisless,thelowpressure;lesswaterconsumptionandwatersupply,thepressure.Keepthewaterpressureconstant,canmakethewatersupplyandwaterbalancebetweenwatersupplyandwaterforalongtime,thatis,lesswaterwhenthewaterisless,soastoimprovethequalityofwatersupply.
Constantpressurewatersupplysystemfortheuserisveryimportant.Inproductionandlivingwater,ifwatersupplyduetoinsufficientpressureorshortofwater,mayaffectthequalityoflife,seriouswhencaninfluencethesurvivalsafety,suchaswhenafireoccurs,ifthewaterpressureisinsufficientorwatersupply,canquicklyfire,maycausesignificanteconomiclossesandcasualties.Therefore,waterareabymeansofArtsistheconstantpressurewatersupplysystem,canproducegreateconomicbenefitandsocialbenefit.
Withthedevelopmentofelectricpowertechnology,frequencyconversiontechnologyperfected,withvariablefrequencyspeedcontrolasthecoreoftheintelligentwatercontrolsystemreplacedtheprevioushighlevelwatertankandapressuretankandwatersupplyequipment,stablestarting,thestartingcurrentcanbelimitedwithinspecifiedcurrent,therebyavoidingthestartingtimeoftheimpactofpowergrid;becausetheaveragerotationalspeedofpumpisreduced,whichcanextendthepumpsandvalvesandotherthingsoflife;toeliminatethestartandstopofthewaterhammereffect.Thestableandsafeperformance,simpleandconvenientoperation,andcompleteandthoughtfulfunction,willmakethewatersupplyandwaterconservation,energysaving,laborsaving,ultimatelyachieveefficientoperation.
二.Theapplicationofvariablefrequencycontrolconstantpressurewatersupplymode
Usuallyinthesamewayinthewatersupplysystem,settingmultiplecommonpump,watersupplywhenthequantityofmultipumpfullopen,watersupplyononeortwohours.Inthevariablefrequencyspeedcontrolforconstantpressurewatersupply,intwoways,oneisallpumpswithafrequencyconverter;andeachwaterpumpwithafrequencyconverter.Afteramethodbasedonpressurefeedbacksignal,operatedbyPIDautomaticallyadjuststheoutputfrequencyoftheinverter,changethespeedofthemotor,eventuallyreachingthepurposeofnetworkvoltage,aclosedloop,isrelativelysimple,butthecostishigh.Thepreviousmethodoflowcost,lessthankindofpoorperformance,butthecontrolprogramiscomplex,isthefuturedirectionofdevelopment,suchastheShanghaiartsandscienceandtechnologyofconstantpressurewatersupplycontrolsystemcanrealizeainvertercontrolanynumberofmotorfunction.Theprinciplementionedbelowaremultiplemotorinverterdrivesystem.
三.ThePIDcontrolprinciple
Accordingtothefeedbackprinciple:
tomaintainaphysicalquantityunchangedoressentiallyunchanged,itshouldbringthephysicalquantityandtheconstantcomparison,toformaclosedloopsystem.Wewanttokeepthepressureconstant,sowemustintroducethehydraulicfeedbackvaluewithagivenvalue,therebyformingaclosedloopsystem.Butthecontrolsystemischaracterizedbynonlinear,inertialsystem,nowthecontrolmethodcombinedwithPIDinthelargepressurefluctuation,usingfuzzycontrol,inordertoacceleratetheresponsespeedinthepressurerange;usingPIDtomaintainstaticaccuracy.ThisthroughthePLCandintelligentinstrumentcanshowthealgorithm,whilethePLCprogrammingtoshowwhenthepumpfrequencyandinverterswitchingbetween.Practicehasprovedthat,usingthismethodisfeasible,andthecostisnothigh.
Tomaintaintheconstantpressurewatersupplynetwork,accordingtothefeedbacktheoreminnetworkmanagementsysteminstalledonthepressuretransmitterasafeedbackelement,becauseoflong,largediameterpipesystemofwatersupply,pipelinepressurechargingareslower,sothesystemisabigtimelagsystem,isnoteasytodirectlywithPIDregulatorforcontrol,andadoptsPLCisinvolvedinthecontrolofthewaytoachievethecontrolsystemregulatestheeffect.
四.Frequencycontrol
Usingfrequencycontroltorealizeconstantpressurewatersupply,withadjustablevalvetorealizeconstantpressurewatersupply,energy-savingeffectisverysignificant(accordingtothespecificcircumstancescalculated).Theutilitymodelhastheadvantagesof:
1,startingbalance,thestartingcurrentcanbelimitedwithinspecifiedcurrent,therebyavoidingthestartingtimeoftheimpactofpowergrid;
2,becausetheaveragerotationalspeedofpumpisreduced,therebyprolongingtheservicelifeofpumpandvalveetc.;
3,caneliminatethestartandstopofthewaterhammereffect;
Generallyspeaking,whenperformedbyafrequencyconvertertocontrolamotor,justmaketheinvertermotorcapacityandtheactualcapacityofthemotorcanbe.Whenoneinvertercontroltwomotors,principleofinvertermotorcapacityshouldbeequaltothecapacityofthetwomotors.Butifthepeakloadofwatermorethantwopumpsatfullsupplyalotofdifference,Shanghaiartsandscienceandtechnologyengineerssuggested,maybeconsideredappropriatetoreducethecapacityofthefrequencyconverter,butattentionshouldbepaidtoleaveenoughcapacity.
Althoughthepumpatlowspeed,smallworkingcurrentofthemotor.However,whentheuserwiththewatervolumechangesfrequently,themotorwillbeinfrequentascending,descendingandascending,descendingspeedstate,thecurrentspeedslightlyoverthemotorratedcurrent,causethemotoroverheat.Therefore,themotorthermalprotectionisrequired.Forthisduetofrequentascending,descendingspeedandaccumulatedtemperaturerise,frequencyconverterinelectronicthermalprotectionfunctionisdifficulttoplayaprotectiverole,soshouldbeusedinthermalrelayformotorthermalprotection.
Themainfunctionofpreset,thehighestfrequencyshouldberatedmotorfrequencyconverterthehighestworkingfrequency.Ascending,descendingspeedtimeinusingPIDregulatorcase,ascending,descendingvelocitytimeshouldbesettobeshort,soasnottoaffectthePIDadjusterdeterminesthedynamicresponseprocess.SuchasthefrequencyconverterwithPIDregulationfunction,aslongasthepresetsetPIDfunctioneffectively,thesettingoftheaccelerationanddecelerationtimewillautomaticallylapse.
五.Constantpressurewatersupplysystem
1,power:
theoptimalenergy-savingcontrolsoftware,sothepumptoachievemaxi