四字成语翻译开题报告.docx
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四字成语翻译开题报告.docx
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四字成语翻译开题报告
四字成语翻译开题报告
篇一:
翻译报告开题报告
四川外语学院XX级翻译硕士专业研究生
毕业暨学位论文计划(翻译报告类)
四川外国语大学翻译学院制表
说明:
1.报告用中文撰写;2.学生须按时提交开题报告并参加公开开题。
填表日期:
篇二:
开题报告翻译
Summaryofpowerflowcalculation
The1.1powersystem
Theearlydevelopmentofelectricpowerindustry,electricityisdirectlyintheuserinthevicinityofthestation(orpowerplant)inproduction,thepowerplanttoruninisolation.Withthedevelopmentofindustryandagricultureproductionandthecity,rapidincreaseinelectricityrequirements,whilethethermalenergyresources(suchascoal)andwaterresourcerichareasareoftenfarawayfrompowerareconcentratedinthecityandindustrialandminingareas,inordertosolvethiscontradiction,itneedstobuildalargepowerstationresourcerichregionsinthepower,thenthepowercanbetransmittedoveralongdistancetothepowerusers.Atthesametime,inordertoimprovethereliabilityofpowersupplyandutilizationoftheoveralleconomy,andputmanyscatteredinvariousformsofpowerstation,thepowertransmissionlinesandsubstationslinked.Thegenerator,thestep-upandstep-downsubstation,transmissionlinesandelectricalequipmentwholeorganicconnected,thatisknownastheelectricpowersystem.Theoriginalmotivepowersystemandgenerator(suchassteamturbine,turbine),theoriginalmotiveforcetopart(suchasheatboiler,reservoir,thenuclearpowerstationreactor),heatingandheatingequipment,calleddynamicsystem.
Theconceptof"flexibleACtransmissionandthenovelDCtransmission"ofthemodernpowersystemispresented.FlexibleACtransmissiontechnologyreferstotheuseofsolidstateelectronicsandmodernautomaticcontroltechniqueforACpowervoltage,phaseangle,impedance,powerandthecircuitforreal-timeclosed-loopcontrol,soastoimprovethelevelofstablewaterpressuretransmissioncapacityandpowersystem.AnewDCtransmissiontechnologyisthelatestachievementinreferstotheapplicationofthepowerelectronictechnology,improvingandsimplifyingtheconverterstationcostetc.
Operationmanagement,thetrendistodeterminethebasicstartingpointofpowergridoperationmode;inthefieldofplanning,theneedforflowanalysistoverifytherationalityoftheplanningscheme;inreal-timeenvironment,dispatcherpowerflowprovidesagridintheexpectedoperatingconditionsinordertocheckthereliabilityofthepowerflowdistribution.Inmanyfieldsofpowersystemdispatchingoperationarerelatedtothepowerflowcalculation.Thetrendistodeterminethebasicfactorsofoperationstateofthepowernetwork,powerflowproblemisthebasisandprerequisitetoresearchtheproblemofpowersystemsteadystate.
Calculationofthe1.2tide
Powerflowcalculationisacalculationofpowersystemsteady-stateoperation,whichdeterminesthepowersystemrunningstateofeachpartaccordingtothegivenoperatingconditionsandsystemwiring:
thebusvoltage,powerflowthrough
thecomponents,thesystempowerlossetc.Intheresearchofoperationmodeofpowersystemplanninganddesignoftheexistingpowersystem,calculationisneededtoquantitativelyanalyzetherationalityistheprogramorrunmodepowersupplyusingthetrend.ReliabilityandeconomyInaddition,basedpowerflowcalculationandcalculationsystemofdynamicandstaticstabilization.Sothecalculationofpowerflowcalculationofpowersystemisaveryimportantandbasic.Powerflowcalculationofpowersystemisdividedintooff-linecalculationandon-linecalculationoftwokinds,theformerismainlyusedfortheoperationmodeofthesystemdesignandthearrangementofsystem,whichisusedtomonitortherunningsystemandrealtimecontrolTheuseofelectronicdigitalcomputerforpowerflowcalculationofpowersystemfrom50timemetaphasebegan.Inthis20years,thepowerflowcalculationhavebeenusedinavarietyofdifferentmethods,thedevelopmentofthesemethodsmainlyfocusonsomebasicrequirementsforpowerflowcalculationof(本文来自:
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四字成语翻译开题报告)Thepowerflowcalculationrequirementscanbesummarizedasthefollowingpoints:
(1)Thereliabilityofthecalculationmethodandconvergence;
(2)Thecomputermemoryrequirements;
(3)Thecalculationspeed;
(4)Thecomputationalconvenienceandflexibility
Calculationofpowerflowinmathematicsismultivariatenonlinearequationsolutionofagroupthemethodsareallcannotdowithoutiteration.Therefore,calculationofflow,firstlyitcanreliablyconverge,andgivesthecorrectanswer.Becauseofsomecharacteristicsofthestructureandparametersofpowersystem,andwiththepowersystemisenlargedcontinuously,equationoforderflowcalculationismoreandmorehigh,theequationisnotanymathematicalmethodscanensurethecorrectanswers.Thissituationhasbecomeanimportantfactorinthecalculationofpowersystempersonnelcontinuetoseekamorereliablemethod
Thesignificanceanddevelopmentofthe1.3powerflowcalculation
Powerflowcalculationofpowersystemisoneofthemostbasiccalculationinelectricpowersystemanalysis,calculationofthesteadystateoperationofnormalandfaultconditionsofcomplexpowersystemPowerflowcalculationofthetargetiscalculatedforapowersystemrunningstate.Thenodevoltageandpowerdistribution,allelementsusedtocheckwhetherthesystemisoverloaded.Thevoltagewhethermeettherequirements,distributionandpowerallocationisreasonableandthepowerlossetc.Ontheoperationandexpansionofthepowersystem,thepowersysteminthenewdesignandanalyzethestaticandtransientstabilityofpowersystemisbasedonpowerflowPowerflowcalculationresultsareavailablesuchassteadystateanalysisofpowersystem,hasadirectimpactonmodel
andmethodofsafetyestimationandoptimalpowerflowinpowerflowcalculation.TheactualpowersystemloadflowtechniquethatmainlyusesTheNewton-Raphsonmethod.
Inthemethodofoperationmanagement,thetrendistodeterminethebasicstartingpointofpowergridoperationmode;inthefieldofplanning,theneedforflowanalysistoverifytherationalityoftheplanningscheme;inreal-timeenvironment,dispatcherpowerflowprovidesapluralityofgridintheexpectedoperatingconditionsinordertocheckthereliabilityofthepowerflowdistribution.Inmanyfieldsofpowersystemdispatchingoperationarerelatedtothepowerflowcalculation.Thetrendistodeterminethebasicfactorsofoperationstateofthepowernetwork,powerflowproblemisthebasisandprerequisitetoresearchtheproblemofpowersystemsteadystate.
Thebeginningofpowersystemloadflowsolutioninadigitalcomputer,generallytakeasuccessivesubstitutionmethodinthenodeadmittancematrixbased.Theprincipleofthismethodisrelativelysimple,comparedwithdigitalcomputermemoryrequirements,tothe50'scomputermanufacturinglevelandatthelevelofthepowersystemtheory.Butitspoorconvergence,whenthesystemscalebecomeslarge,asharpriseinnumberofiterations,thenonconvergenceofthesituationoftenappearsinthecalculation.Thishasforcedthepowersystemcomputationresearchersturntosuccessivesubstitutionmethodwiththeimpedancematrixbased.Convergenceoftheimpedancemethodimprovesthesystempowerflowcalculationproblem,solvedsomesystemofadmittancemethodcannotsolvethepowerflowcalculation,obtainedthewidespreadapplicationinthe60's.ThemaindisadvantageofimpedanceislargeEMSmemory,theperiterationcomputationalquantity.Whenthesystemisgrowingtheseshortcomingsismoreprominent.Inordertoovercometheimpedancemethodintermsofmemoryandspeeddisadvantage,60timemetaphasedevelopmentblockimpedancemethodbasedonimpedancematrix.Thismethod,alargesystemisdividedintoseveralsmallareasystem,onlytheimpedancebetweentheimpedancematrixstorageareasandtheircontactlinesystemneedsinthecomputer,notonlygreatlysavesmemorycapacity,butalsoimprovethespeedofcalculation.
AnotherwaytoovercometheshortcomingsoftheimpedancemethodisusingtheNewton-Raphsonmethod.Thisisthetypicalmethodofnonlinearequationsolvingmathematics,hasbetterconvergence.Inthesolutionofpowerflowcalculationofpowersystemproblems,isbasedontheadmittancematrixbased,therefore,aslongaswecanbesparseintheiterativeprocessasmuchaspossibletomaintaintheequationcoefficientmatrix,cangreatlyimprovetheefficiencyofNewtonpowerflowprogramSince60timemetaphaseusingthebestorder
eliminationinNewtonmethod,NewtonmethodinconvergenceMemoryrequirements.Speedthantheimpedancemethod,alate60'sexcellentmethodwidelyused.
Powerflowcalculationisapowersystemanalysisofthemostbasicterms,thecomplexpowersystemundernormalandfailureconditionssteady-staterunningthecalculation.Thetrendiscalculatedtostrikeatargetinthepowersystemtoberunningthecalculation.Thatis,voltageandpowerdistributionnode,tocheckwhetherthecomponentsofthesystemoverload.Voltagemeetsallrequirementsofthedistributionandallocationofpowerisreasonableandthepowerloss,andsoon.Oftheexistingpowersystemoperationsandexpansion,thenewpowersystemplanninganddesignofthepowersystemforstaticandtransientstabilityofthetrendarecalculatedasthebasis.Ifthetrendoftheresultsavailableonsteady-statepowersystem,orestimatetheoptimalsecurity,suchasthetrendoftheflowcalculationmethodandthemodelhasadirectimpact.TheactualpowersystemthatthemaintrendoftechnologyadoptionNewton-Raphsonmethod.
电力系统潮流计算综述
1.1电力系统叙述
电力工业发展初期,电能是直接在用户附近的发电站
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