恒压供水外文翻译.docx

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,sothepumptoachievemaximum