基于单片机控制的自动给水系统外文文献.docx

基于单片机控制的自动给水系统外文文献.docx

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基于单片机控制的自动给水系统外文文献

基于单片机控制的自动给水系统外文文献

燕京理工学院机电工程学院——外文文献原稿和译文

YANCHINGINSTITUTEOFTECHNOLOGY

外文文献原稿和译文

学院:

机电工程学院

专业:

机械工程

学号:

130310208

姓名:

张磊

指导教师:

王续明

2017年3月

燕京理工学院机电工程学院——外文文献原稿和译文

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,to

燕京理工学院机电工程学院——外文文献原稿和译文

achieveadesiredfunction.Source:

networktransmissionanddistributionequipmentinstallationinpipelinepressuresensor,fordetectingthewaterpressureofthepipenetwork,convertingpressureis4~20mAcurrentorvoltagesignalis0~10V,suppliedtotheinverter.

Converterpumpmotorcontroldevice,inaccordancewiththeconstantwaterpressureneedstobe0~50Hzfrequencysignalsupplypumpmotor,adjustitsspeedSAJconverterispowerful,i.e.pre-programmedsetparameterset,willusetherequiredintheprocessofsettingthenumberofparametersisreducedtoaminimum,defaultvalueaccordingtotheapplicationparameterofthemacrochoiceanddifferent.ThesystemadoptsthePIDcontrolapplicationmacro,closedloopcontrol.Inverterbasedonaconstantpressurecorrespondingtothevoltagesettingvalueandfromthepressuresensortoobtainthefeedbackcurrentsignal,theuseofPIDcontrolmacroautomaticallyadjust,changethefrequencyoutputvaluetoadjustthecontrolthespeedofthepumpmotor,toensurethatthepipenetworkpressureconstantrequirements.

Theapplicationofinverterintheconstantpressurewatersupply

1.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.

燕京理工学院机电工程学院——外文文献原稿和译文

Withthedevelopmentofelectricpowertechnology,frequencyconversiontechnologyperfected,withvariablefrequencyspeedcontrolasthecoreoftheintelligentwatercontrolsystemreplacedtheprevioushighlevelwatertankandapressuretankandwatersupplyequipment,stablestarting,thestartingcurrentcanbelimitedwithinspecifiedcurrent,therebyavoidingthestartingtimeoftheimpactofpowergrid;becausetheaveragerotationalspeedofpumpisreduced,whichcanextendthepumpsandvalvesandotherthingsoflife;toeliminatethestartandstopofthewaterhammereffect.Thestableandsafeperformance,simpleandconvenientoperation,andcompleteandthoughtfulfunction,willmakethewatersupplyandwaterconservation,energysaving,laborsaving,ultimatelyachieveefficientoperation.

2.Theapplicationofvariablefrequencycontrolconstantpressurewatersupplymode

Usuallyinthesamewayinthewatersupplysystem,settingmultiplecommonpump,watersupplywhenthequantityofmultipumpfullopen,watersupplyononeortwohours.Inthevariablefrequencyspeedcontrolforconstantpressurewatersupply,intwoways,oneisallpumpswithafrequencyconverter;andeachwaterpumpwithafrequencyconverter.Afteramethodbasedonpressurefeedbacksignal,operatedbyPIDautomaticallyadjuststheoutputfrequencyoftheinverter,changethespeedofthemotor,eventuallyreachingthepurposeofnetworkvoltage,aclosedloop,isrelativelysimple,butthecostishigh.Thepreviousmethodoflowcost,lessthankindofpoorperformance,butthecontrolprogramiscomplex,isthefuturedirectionofdevelopment,suchastheShanghaiartsandscienceandtechnologyofconstantpressurewatersupplycontrolsystemcanrealizeainvertercontrolanynumberofmotorfunction.Theprinciplementionedbelowaremultiplemotorinverterdrivesystem.

3.ThePIDcontrolprinciple

Accordingtothefeedbackprinciple:

tomaintainaphysicalquantityunchangedoressentiallyunchanged,itshouldbringthephysicalquantityandtheconstantcomparison,toformaclosedloopsystem.Wewanttokeepthepressureconstant,sowemustintroducethehydraulicfeedbackvaluewithagivenvalue,therebyforming

燕京理工学院机电工程学院——外文文献原稿和译文

aclosedloopsystem.Butthecontrolsystemischaracterizedbynonlinear,inertialsystem,nowthecontrolmethodcombinedwithPIDinthelargepressurefluctuation,usingfuzzycontrol,inordertoacceleratetheresponsespeedinthepressurerange;usingPIDtomaintainstaticaccuracy.ThisthroughthePLCandintelligentinstrumentcanshowthealgorithm,whilethePLCprogrammingtoshowwhenthepumpfrequencyandinverterswitchingbetween.Practicehasprovedthat,usingthismethodisfeasible,andthecostisnothigh.

4.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,soshouldbeusedinthermal

燕京理工学院机电工程学院——外文文献原稿和译文

relayformotorthermalprotection.

Themainfunctionofpreset,thehighestfrequencyshouldberatedmotorfrequencyconverterthehighestworkingfrequency.Ascending,descendingspeedtimeinusingPIDregulatorcase,ascending,descendingvelocitytimeshouldbesettobeshort,soasnottoaffectthePIDadjusterdeterminesthedynamicresponseprocess.SuchasthefrequencyconverterwithPIDregulationfunction,aslongasthepresetsetPIDfunctioneffectively,thesettingoftheaccelerationanddecelerationtimewillautomaticallylapse.

燕京理工学院机电工程学院——外文文献原稿和译文

译文

供水系统是国民生产生活中不可缺少的重要一环。

传统供水方式占地面积大，水质易污染，基建投资多，而最主要的缺点是水压不能保持恒定，导致部分设备不能正常工作。

变频调速技术是一种新型成熟的交流电机无极调速技术，它以其独特优良的控制性能被广泛应用于速度控制领域，特别是供水行业中。

由于安全生产和供水质量的特殊需要，对恒压供水压力有着严格的要求，因而变频调速技术得到了更加深入的应用。

恒压供水方式技术先进、水压恒定、操作方便、运行可靠、节约电能、自动化程度高，在泵站供水中可完成以下功能:

（1