馈电开关英文资料.docx

馈电开关英文资料.docx

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馈电开关英文资料

POWERELECTRONICTECHNOLOGYAPPLICATIONSINTHEPOWERSYSTEM

Powerelectronictechnologyhasbeenwidelyusedinpowersystems.High-powerelectronicdevicesusedinflexibleACtransmissiontechnology,qualitativepowertechnology,thenewDCtransmissiontechnology,harmoniccontrolandsynchronizationbreakingtechnology,itisthethingofnearlylastfewyears.

Thedevelopmentofpowersystemandpowerelectronictechnology,

（1）thepowerelectronictechnologyisalsocalledenergytechnology,withmicroelectronicsscienceofcommonfeatures,strongcreativityandrapidlychangingcharacteristics.Theworldresourcesexhausted,thedeteriorationoftheenvironment,energydevelopment,saveandsustainabledevelopmentintothe21stcenturyglobaleconomicandsocialdevelopmentoftheimportantstrategic.Electricityisthemostclean,themostconvenientandthequalityofelectricenergy,utilizingandpromotetherapiddevelopmentofecologicalcivilizationofhumansociety,andalsotheindustrializationandtheinformationage.Powerelectronictechnologydevelopment,thecausewasbornwiththerevolutionarychange,powerutilizationgreatlychangedthetraditionalconceptofpeopleuseelectricity.Electricpowerqualityhasattractedattention,thedepthofelectricitythroughpowerelectronicdevicesandadjusttheproportionisalsousedtomeasurethelevelofpowerareimportantindexes.Somestatistics,thisindexcurrentlyintheglobalscopehasbeento40%.Overthenextfewyearsareexpectedtoreach80%.

（2）powerelectronictechnologytoachieveoptimalpowerconversion,highefficiency,energysaving,materialsaving,isautomaticandintelligent,mechatronicsfieldofimportanttechnicalsupport.Withthepowerelectronictechnologyinnovation,powerelectronicsdevicemanufacturingtechnologyhasimprovedgreatly,andthuscausestheindustrialautomationcontrolandelectromechanicalintegrationofcompetition.（3）powerstations,powerandelectricequipmentintoelectricityassociation,calledthepowersystem.Asakindofpowerelectronictechnologyconsultativeelectronictechnology,throughthefusionwithhighvoltageelectricitycontrol,hasoozetopowersystemofpowersystem,eachlinktomoderndevelopment,hasbroughtgreatvitality.Sincethereformandopenpolicy,ourcountryelectricpowerindustryachievedrapiddevelopment,formedbythecoalasthemainbody,theelectricpowerasthecenter,oil,gasandcomprehensivedevelopmentofrenewableenergysources.Ourelectricity6.22millionkWinstalledcapacitytoachieve2.87billionkWh,electricity,andarelistedasworld,theproductionanduseofelectricpower.Theelectricpowerdevelopmentexistsinsomeobviousrestrainingfactors.Oneisthepowerlevelsarerelativelylow,averageannualelectricityconsumptionisonlyoneoftheworld'saveragelevel,economicandsocialdevelopmentofelectricpowerstillexistgreatdemand,Twoisoutstanding,resourceconstraints,lowefficiencyofenergyutilization,Theenergystructureunreasonable,objectiveconditions,powerstructureanddistribution,butalsoreachtheoptimallayout.Torealizethepowerofscientificdevelopment,mustingreaterrangeofelectricpowerresourceconfiguration,toestablishadjustment,thenationalunifiedpowersystem.Accordingtothesituationofourcountry,theelectricpowerdevelopmentobjectivesandguidelinesforthebigunitmustfollow,powerplant,automation,information",Hydroelectricpower,power,nuclearpower,newenergyresourcescomprehensivedevelopment,Powertransmissionfromwesttoeast,northandsouth,offeringmutuallostthenetworking,networkstructure,synchronousultramodernpowersystemconstruction,andthedirectionofpowertheadvancementofscienceandtechnologyisanimportantstrategicemphasis,especiallytospeedupthepowerelectronictechnologywiththermalpowertechnology,powertechnology,wirelesstechnologyandelectronictechnology,automaticcontroltechnologyandthemutualinfiltrationandmutualcomplementationandmutualcomplement,deepenthedevelopment,toestablishthedevelopmentofpowersystem,technicalsupportsystem.

1,Powerelectronictechnologyappliedtopowerlink

Powersystemofpowergeneratinglinksinvolvedinvariousequipmentandpowerelectronictechnologyapplicationstoimprovetheequipmentrunningcharacteristicsforthemainpurpose.

（1）Largegeneratorexcitationcontrolofstatic.Staticexcitationusingthyristorrectifiertheway,withsimplestructure,highreliabilityandlowcostadvantages,isthemajorpowersystemiswidelyused.Duetothemiddleomittedexciterinertia,thushasitsuniquelink,toadjustthespeedofadvancedcontrollawprovidesfullfunctionandproducegoodcontroleffectoffavorableconditions.

（2）Thewindgeneratorspeedconstantfrequencyexcitation.Hydroelectricpowerdependsontheheadoftheeffectivepressureandflowofthehead,whenalargerextentchange（especiallythepumped-storageunit）,unitofthebestspeedalsochange.Windpowerofeffectivepowerandspeedofthethreetimes,isdirectlyproportionaltothemaximumwindspeedwindmillscapturewiththewindchanges.Inordertoobtainmaximumeffectivepower,canmaketheoperationunitbyadjustingtherotorspeedandthecurrentfrequency,andtherotorspeedstackmaintainsafterstatorfrequencyoutputfrequencyisconstant.Theapplicationofinverterpoweristhecoretechnology.

（3）Ofthepumppowerfrequencyconversionfan.Theaveragepowerapcrateof8%,thermalpowerconsumptionaccountsforaboutafanpumppowerequipment,andthelowefficiencyofrunning65%.Usingloworhighvoltageinverter,theimplementationofthepumpfrequencyconversionfan,canachievethepurposeofsavingenergy.Lowvoltageconvertertechnologyathomeandabroadhavealreadyverymature,manymanufacturers,andacompleteseriesofproducts.

（4）Solarcontrolsystem.Developmentandutilizationofcleanenergyendlessnew--solarenergystructureadjustment,thefutureisanimportantstrategicmeasures.Solarpower,bothindependentsystemandgridsystem,usuallyneedtosolararrayofconvertingacmotor,sohasthefunctionoftheinverterpowertrackingsystemsbecome.Japan'splansto3~4kWsunshineinthegridgenerationsystemisgivenpriorityto,theimplementationofthetransmissiontothetownshipconstructionin10~15kWindependentsystem,buttherearelargesysteminCalifornia'sSiemenssolarplants（7.2MW）,etc.

2,FlexibleACTransmissionSystem（FACTS）

FlexibleACTransmissionSystemisanewtechnologyinthelateeightiesdevelopedrapidlyinrecentyearsintheworld.Expertspredictthetechnologywillcausethepowertransmissionanddistributionofmajorchanges,forfulluseofexistingnetworkresourcesandtoachieveefficientuseofenergy,thistechnologywillplayanimportantrole.

FlexibleACtransmissiontechnologyisthecombinationofthepowerelectronicstechnologyandmoderncontroltechnologytoachievethepowersystemvoltage,parameters（suchaslineimpedance）,phaseangle,thetrendofcontinuouspowerregulationandcontrol,therebythetransmissionlinecapacityandpowertransmissionthelevelofsystemstability,havebeenhighlyimproved,italsoreducetransmissionlosses.

Traditionalpowerflowregulationmeasures,suchasmechanicalcontrollingphaseshifterwithloadtransfertransformertap,switchcapacitorsandinductors,fixedseriescompensationdevices,canonlyachievesomeoftheregulatoryfunctionofsteady-stateflow,and,becausemechanicalswitchingtimeislong,slowresponse,unabletoadaptquicklyandflexiblyduringthetransientprocessinacontinuouspowerflowregulation,oscillationdampingsystemrequirements.Therefore,thenetworkneedstopromotethedevelopmentofflexibleACtransmissionofthedevelopmentofnewtechnologiesandapplications.Inrecentyears,flexibleACtransmissiontechnologyhasbeenintheUnitedStates,Japan,Sweden,BrazilandothercountriesimportantEHVTransmissionProjecthasbeenapplied.

AlthoughtheflexibleACtransmissiontechnologyhasbeenappliedseveraltransmissionprojectsandproveditssuperiorperformanceinimprovingthetransmissionline,thedampingsystemoscillation,fastreactivepowerconditioningsystems,improvesystemstabilityandsoon,butthepaceofitsmarketingapplicationslowerthanexpected.Mainreasons:

projectcostsolutionsthantheconventionalhigh.Therefore,onlyintheconventionaltechnologycannotsolvethecase,theuserwillturntoFACTStechnology;FACTStechnologyalsoneedsfurtherimprovement.FACTSTechnologynowalsobelimitedtoindividualprojects,iflarge-scaleapplicationofFACTSdevices,butalsotosolvesometechnicalproblemsoverall.WiththepowerelectronicdeviceperformanceenhancementandcostreductiontopowerelectronicdevicesasthecorecomponentswillreducethecostofFACTSdevicesmaybeinthenearfuturethantheconventionaltransmissionanddistributionprogramsmorecompetitive.

FACTStechnologyhasbeenimproved,somenewofFACTSdevicesaredeveloped,forexample:

convertedstaticcompensatordevices（CSC）,Itconsistsofvoltagesourceinverterdevicewhichcancontroltwoormorelineflow（active,reactive）,voltage,impedanceandphaseangle,anditcanachieveconversionbetweentwocircuitline.Convertiblestaticcompensatorhasthefollowingfeatures:

（1）Staticsynchronouscompensatorparallelreactivecompensationfunction;

（2）Staticsynchronousseriescompensatorfunction;

（3）Integratedflowcontrollerfunction;

（4）Thetwolinesabovethetrendlinebetweentheflowcontrolfunction;CSCisconsideredthethirdgenerationofflexibleACtransmissiondevices.

Thedevelopingtrend