简介:IntroductionInrecent10years,duetofastdevelopingofeconomyinChina,seriouspowershortageoccurs.Thesystemfrequencyoftenfelltoabnormalvaluesinmostnetworks.Forthesecurityofpowersystems,forcedswitchoffoffeedersfromthedistributionsubstationoftenhappendtorecovernormalfrequency.Infact,thespeedofdevelopmentofChinesepowerindustryisveryhighinthisperiod.Theyearlyaverageincreasingrateofgeneratingcapacitywasabout8%.Theyearlynewlyinstalledca-pacitywasmorethan9000MWinrecent4years.Buttheannual
简介:Summary1.Thereare12powersystemsincluding5regionalpowersystemswithover1000MWofcapacityeach.In1989CentralandEastChinapowersystemswereinterconnectedbya±500kVHVDCLine.2.Thehierarchicalcontrolorganizationcanbedividedinto5levels,i.e.NCC,6RCCs,25PCCs,250DCCsandmorethan2000CCCs.3.AllcontrolcenterswillbeequippedwithSCADAandEMSinthenearfuture.4.Chinapowersystemhasalarge,dedicatedcommunicationnetworkofitsown.
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简介:Anenergy-savingcontrolstrategybasedonpredictivecontrolforcentralair-conditioningsystemsisproposedinthispaper.Thecoldloadmodelisdevelopedtodescribethedynamiccharacteristicsoftemperaturecontrolsystems,andthenparametersinthecoldloadmodelandinthecentralair-conditioningsystemmodelareestimated.Generalizedpredictivecontrol(GPC)isusedtoestablishanoptimizationmodeltominimizetheconsumptionofenergyandthecontrolerroroftemperature.Thesimulatedanne...
简介:BackgroundThepowerindustryhaslongbeenplaguedwithcomplicationsandoutagesrelatedtocorrosionofplantcomponents.Priortothemid-sixties,corrosionofboilerwater-walltubeswasoneoftheprominentproblemsinpowerplants.Water-walltubescorrosionproceedingunderironoxidedepositcausedcausticgougingoracidicembrittlementoftubemetal.Manyboilertubesfailedbysuddenrupture.Fieldandlaboratorystudiesshowedthat,carbonatealkalinityandneutralsaltinboilermakeupwatertreated
简介:ThePLCanduppercomputerareusedinBOPcontrolsystemoftraditionalthermalpowerplanttomonitorthein-situequipment.Itiscomplicatedandwasteslaborandresources.Itisdifficulttomaintainandmanagethem.BeijingGuoDianZhiShenControlTechnologyappliedthehomemadeDCS(EDPF-NTSystem)totheintegratedBOPcontrolsystemof600-MWsupercriticalpowerunit,whichoffersadvantagesinefficiencypromotion,costreductionandresourcesharing.ThatalsoreflectsthedominanceofEDPF-NTSysteminperformance,price,real-timeDUP,networkcompatibilityandcommunication.Thisarticleintroducesthemaincharacteristics,structureandconfigurationofEDPF-NTSystem,aswellasthehierarchicaloperation,themulti-domainnetworkstructureandtheprivatenetworkrouterdevelopedforZhuanghePowerPlant.
简介:Reliableconnectionofturbinegeneratorsincomplexmainwiringstructurestothepowergridthroughapluralityofswitchesisanewkeyproblem,referredtoasmultipointautomaticsynchronization(MPAS),inautomaticcontrolsystems(ACS).Inthispaper,differentmethodsofvoltage-frequencyandphase-differencecontrolareanalyzed,andacontrolmethodologybasedonactivefrequencytracking(AFT)ispresented.Throughtheestablishmentofthemulti-pointautomaticsynchronizationmodelandtheanalysisofthegovernortransferfunctionwiththiscontrolmethod,theimportantcontrolparametersandautomaticprocesscontrolsequencearesummarized.Thecorrectnessandeffectivenessofthedesignedmethodologyareinspectedthroughon-sitetesting,andtheimportanceofthefunctionandselectionofparametersarealsoexplored.