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：ItisestimatedthatChinawillemit28milliontonsofSO,in2020.16milliontonsmorethantheamountthatthecountry'senvironmentcanaccommodate.

简介：Anenergy-savingcontrolstrategybasedonpredictivecontrolforcentralair-conditioningsystemsisproposedinthispaper.Thecoldloadmodelisdevelopedtodescribethedynamiccharacteristicsoftemperaturecontrolsystems,andthenparametersinthecoldloadmodelandinthecentralair-conditioningsystemmodelareestimated.Generalizedpredictivecontrol(GPC)isusedtoestablishanoptimizationmodeltominimizetheconsumptionofenergyandthecontrolerroroftemperature.Thesimulatedanne...

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简介：BackgroundThepowerindustryhaslongbeenplaguedwithcomplicationsandoutagesrelatedtocorrosionofplantcomponents.Priortothemid-sixties,corrosionofboilerwater-walltubeswasoneoftheprominentproblemsinpowerplants.Water-walltubescorrosionproceedingunderironoxidedepositcausedcausticgougingoracidicembrittlementoftubemetal.Manyboilertubesfailedbysuddenrupture.Fieldandlaboratorystudiesshowedthat,carbonatealkalinityandneutralsaltinboilermakeupwatertreated

简介：Theboilerisoneofthekeypartsofpowerstation.Monitoringtheoperationoftheboilerautomatically,continuouslyandaccuratelyisveryimportant.Incaseofmalfunctions,anexpertsystemmightbehelpfultofindthesourcesoffaults,andthereafterwillassisttheoperatortoactcorrectlyandtopreventthefaultfromfurtherdevelopment.Inthispaper,asimulationstudyofanexpertsystem,whichcandiagnosetherunningfaultsofboilersystem,isconducted.Shallowanddeeptwo-layerknowledgebasestructureisusedinthistwolayersofknowledgebase.So.thiskindofexpertsystemcanovercomethedisadvantagesoftheoldtypesofexpertsystems,whichareonlyabletodealwithexperiencerulesbase.Asimulatorofpowerboilerisusedfortheresearchonfaultdiagnoseexpertsystem.Thisboilersimulatorgivesallnecessaryinformationforthediagnosis.Theknowledgebaseofexpertsystemisbuiltinhierarchies,sothespeedofreasoningmaybeinvreased.Afterthereasoningthesys

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：Inthepowermarketenvironment,duetotheuncertaintyofthereservoirinflowandthepoolpurchaseprice,itisveryimportanttoresearchpowergenerationriskdispatchofhydropowerplants,takingintoconsiderationthebenefitsandriskcontrolofbothsides.Thispaperinvestigatespowergenerationriskdispatchofhydropowerplantsinthemarketenvironment,andproposesamathematicalmodelwhichconsidersmaximizationofbenefitsandriskcontrol,reflectscontrolwillingnessofriskandbenefits,...

简介：Reliableconnectionofturbinegeneratorsincomplexmainwiringstructurestothepowergridthroughapluralityofswitchesisanewkeyproblem,referredtoasmultipointautomaticsynchronization(MPAS),inautomaticcontrolsystems(ACS).Inthispaper,differentmethodsofvoltage-frequencyandphase-differencecontrolareanalyzed,andacontrolmethodologybasedonactivefrequencytracking(AFT)ispresented.Throughtheestablishmentofthemulti-pointautomaticsynchronizationmodelandtheanalysisofthegovernortransferfunctionwiththiscontrolmethod,theimportantcontrolparametersandautomaticprocesscontrolsequencearesummarized.Thecorrectnessandeffectivenessofthedesignedmethodologyareinspectedthroughon-sitetesting,andtheimportanceofthefunctionandselectionofparametersarealsoexplored.

简介：Consideringtheadditionalelectricenergygeneratedafterthefulloperationoftheundergroundhydropowerstation,theelectricenergyaccommodationoftheThreeGorgesProject(TGP)isreviewed.Itisfocusedontheadditionalelectricityaccommodation,basedontheresearchattheearlystage.Theelectricenergyaccommodationsolutionsarerecommendedasthat,basedonthecost-benefitanalysisofthepowerdistributionarea,theadditionalelectricenergyoftheThreeGorgesshouldbegivenprioritytomeettheneedsatthesupplyendofHubeiandChongqing.TheresultsofthisresearchhasareferencevalueontheimplementationoftheThreeGorgeselectricpoweraccommodation,afterthefurtheroptimizationofthetransmissioncurvesinbothwetanddryseasons.

简介：ＦｅａｓｉｂｉｌｉｔｙｓｔｕｄｙｒｅｐｏｒｔｏｎＪｉｎｇｈｏｎｇＨｙｄｒｏｐｏｗｅｒＳｔａｔｉｏｎｉｎＹｕｎｎａｎＰｒｏｖｉｎｃｅｃｏｍｐｌｅｔｅｄＣｈｉｎｅｓｅａｎｄＴｈａｉｅｘｐｅｒｔｓｈａｖｅｃｏｍｐｌｅｔｅｄａｊｏｉｎｔｆｅａｓｉｂｉｌｉｔｙ...

简介：Thispaperpresentsanexperimentalstudyresultofflowfieldofadual-channelburner.Inordertosolvetheubiquitousproblemofbadrigidityofjetsindual-channelburners,wedgeswithdifferentarrangementsandstructuralparameterswereaddedtodifferentpositionsattheoutletoftheburners.LaserParticleImageVelocimetry(PIV)wasusedinthisstudytomeasuretheflowfieldtoinvestigateinfluenceofthewedgesonflowfieldofthedual-channelburner.Experimentalstudyshowsthatfixingwedgesatbothrightandleftsidesoftheburner'soutletcanincreasetheintensityofrecirculationwithoutchangingthesizeoftherecirculationzoneandenhancetherigidityofjetsviaincreasingspeedofthetwoprimaryairjetsattheoutlet.

简介：MostofthehydropowerprojectsinSouthwestChinaandtheadjacentforeignregionswillbeputintooperationbetween2015and2020,whichwillbringsomedifficultiesforreasonableaccommodationanddeliveryofelectricenergy.Inthispapertheauthorstudiesthedevelopmentscale,developmentschedule,accommodationandtransmissionschemesofthecascadehydropowerstationsalongtheLancangRiverbasin,oneofthefivelargebasinsinChina,basedontheloadcharacteristicsofgridsatboththesendingendandthereceivingend,thestrategyofcomplementaryutilizationofthermalpowerandhydropower,theadvancedtransmissiontechnologies,andtheoptimaleconomicperformance.Thestudyresultsshowthat,thecascadehydropowerstationsontheupperreachesoftheLancangRiverinYunnanshouldmainlyserveGuangdongProvince,withproperplanningofpartlyservingYunnanProvinceduringdryseasons.ThetransmissionschemesshouldadoptUHVDC,UHVAC,andsingle-towerdouble-circuitedHVDCtransmissionschemeaccordingtothetransmissioncapacityanddistance.

简介：Thispapertriestodeterminetheeconomicaltypeofreinforcedconcretechimneystructurebasedonthesameeffectiveheightofchimney.Thesimulatedexperimentsofwindtunnelareperformedforthestudy,whichcomparemulti-tubechimneywithsingletubechimneybasedonthesamebuoyancyfluxofplume.Accordingtothecomparisonamongtheexperimentresultsandthepreviousstudyofplumerise,thepaperdefinessomefinalplumerisemodels.Finally,thepapergivesthecost-benefitanalysisaftermakingcostestimationfordifferenttypesofchimneystructureandrecommendstheeconomicalandreasonabletypeofchimneystructureinlightofthesameenvironmentalbenefits.

简介：Inthispaper,aseriesofmajorpolicydecisionsusedtoimprovethepowergridreliability,reducetheriskandlossesofmajorpoweroutages,andrealizethemodernizationof21stcenturypowergridarediscussed.ThesedecisionswereadoptedbyAmericangovernmentandwouldalsobehelpfulforthestrategicdevelopmentofChinesepowergrid.ItisproposedthatChinashouldtakeprecaution,carryoutsecurityresearchontheoveralldynamicbehaviourcharacteristicsoftheUHVgridusingthecomplexitytheo...

简介：The2ndAnnualSessionofEnergyandInformationCommittee,CSEE,chairedbyMr.SunJiapingwasheldinBeijingonDec.17-20,1991.ViceMinisterShiDazhen,ChiefEngineerMr.LuYanchangoftheMinistryofEnergy,GeneralSecretaryMr.DuXingyouofCSEEandsomeotherleadingstaffattendedthemeeting.ViceMinisterShiDazhenexpressedsincerehopeinhisaddresstothesessionthatscien-tificandtechnicalstaffinenergyfieldshouldlaunchmacropolicystudymorewidelyanddeeplyundertheguidelineofso-