潮流计算-英文文献.doc

潮流计算-英文文献.doc

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外文资料

Summaryofpowerflowcalculation

Powersystemiscalculatedonthetrendofsteady-stateoperationofthepowersystemasabasis,it'srunningunderthegivenconditionsanddeterminetheentiresystemwiringinvariouspartsofthepowersystemrunning:

thevoltageofthebus,allcomponentsofamid-streampower,Thepowerloss,andsoon.Powersystemplanninginthedesignandoperationoftheexistingpowersystemintheformofresearch,weneedtocalculatethetrendofusingquantitativeanalysisofcomparativepowerprogrammeoroperationmodeisreasonable.Reliabilityandeconomy.Inaddition,thepowerflowcalculationiscalculatedstaticanddynamicstabilityofthefoundationofstability.Sothetrendiscalculatedonthepowersystemofaveryimportantandverybasisofcalculation.Powerflowcalculationalsodividedintoofflineandonlinecalculationoftwoterms,theformermainlyusedforsystemplanninganddesignandorganizationoftheoperationmode,whilethelatterisrunningforthesystemofregularmonitoringandreal-timecontrol.Theuseofelectronicdigitalcomputertocalculatethetrendofthepowersystemfromthemid-1950shasalreadybegun.Powerflowproblemsinmathematicalcalculationisagroupofdiversenon-linearequationstosolvetheproblem,itssolutioncannotbeseparatedfromiteration.Therefore,theflowcalculationmethod,itrequiresfirstandforemostareliableconvergence,andgivethecorrectanswers.Asthepowersystemstructureandparametersofsomeofthefeatures,andwiththecontinuousexpansionofthepowersystem,thetrendofincreasingorderoftheequation,sotheformulaisnotanymathematicalmethodcanguaranteeisgiventhecorrectanswer.Thiscalculationofthepowersystemtobecomeastaffcontinuetoseeknewandmorereliablewayoftheimportantfactors.

Useofdigitalcomputersinthepowerflowproblemsatthebeginning,thegeneraladoptionofanodeadmittancematrix-basedsuccessiveintothelaw.Theprincipleofthismethodisrelativelysimpletocomparethevolumeofdigitalcomputermemory,tothe1950scomputermanufacturinglevelandthenthepowersystemtheoreticallevel.However,itisconvergenceofthepoor,whenthesystemlarge-scalechange,thesharpriseinthenumberofiterationinthecalculationofconvergenceareoftennotthecaseiteration.Thisforcedthestafftothepowersystemtocalculateimpedancematrix-basedsuccessiveintothelaw.Impedancemethodtoimprovetheflowoftheconvergenceofcomputing,thesolutionoftheadmittancesystemcannotsolvesomeofthetrend,inthe1960s,accesstoawiderangeofapplications,hasthepowersystemdesign.Operationalandresearchhasmadegreatcontribution.Atpresent,therearestillsomeinthepowerindustryunitsimpedancemethodtocalculatethetrend.Impedanceofthemainshortcomingsoftheoccupationofthecomputer'smemory,eachiterationofthelargeamountofcalculation.Whenthesystemcontinuetoexpand,themoreprominentoftheseshortcomings.16Kmemoryofacomputerintheuseofimpedancemethodcanonlybecalculatedat100followingthesystem,32Kmemoryofthecomputercanonlycalculate150nodesunderthesystem.Inthisway,manyofthepowersysteminordertouseimpedancemethodshallnotbefirstonthetrendofthesystemisthestreamliningofwork.Inordertoovercomeresistanceinmemoryandspeedoftheshortcomingsofthemid-1960stothedevelopmentoftheimpedancematrix-basedBlockimpedance.Thisapproachtoalarge-scalesystemdividedintoseveralsmallregionalsystem,thecomputeronlyneedtostorevariouspartsofthesystemimpedancematrixcontactlinebetweenthemandtheresistance,notonlysubstantialsavingsinmemorycapacity,butalsoimprovetheComputingspeed.

OvercometheshortcomingsoftheimpedanceofhungryisanotherwaytouseNewton-Raphsonmethod.Thisisthemathematicsofnonlinearequationstosolvethetypicalmethod,abetterconvergence.Inresolvingtheissueofpowerflowcalculation,isadmittancematrix-based,therefore,aslongaswecanintheiterativeprocessasmuchaspossibletomaintaintheformulacoefficientmatrixsparse,andcangreatlyimproveNewton'sLawtrendoftheefficiencyofprocedures.Sincethemid-1960s,Newton'slawintheuseofthebestorderofelimination,theNewtoninconvergence.Memoryrequirements.Speedallovertheimpedance,asthelate1960safterthewidespreadadoptionoftheexcellentway.

Flowcalculationflexibilityandconvenienceoftherequest,theapplicationofdigitalcomputersisalsoaverykeyissue.Inthepastforalongtime,thepowerflowcalculationreliesontheTaiwanexchange.Taiwansimulatestheexchangeofpowersystems,computingplatformsinthecalculationofthetrendoftheexchange,calculatedatanytimesurveillancesystemscanrundifferentpartsofthestatetomee