简介:ThePowerSystemDepartment(PSD)isthelargestpro-fessionalresearchanddevelopmentorganizationoncomprehensivepowersystemplanning,engineeringandoperationoftheElectricPowerResearchInstitute(EPRI)oftheMinistryofEnergy.TheactiveRD&EofPSDarecomposedofthefollowingfivemajorareas.Powersystemanalysis,softwaredevelopment&application,automaticdevices,DCtransmission,generation&transmissioncommission,modernlaboratoriesforRD&Eandelectricalappara-
简介:Withthedevelopmentofcleanenergy,switchinganddistributionissuesinaphotovoltaicsystemaregettingmuchattentioninrecentyears.ThispaperdesignsaDCtoACinverterandpowerswitchinganddistributionsystembetweenasolarpowersystemandthemunicipalsystembyusingtheDarlingtonamplifierstructurewiththephotosensitiveresistorandaccompanyingrelays,anddetailsthesystemcircuits.Theproposedsystemcanachieveastableoutputof110VAC,aswellasself-generatingdrivingvoltageandswitchingbetweenthemunicipalelectricalsystemandthesolarpowersystem.Themathematicanalysisandactuallytestresultsdemonstratethattheproposedmethodisaneasy,inexpensive,andlowcostwaytobuildasolarpowerswitchinganddistributionsystem.
简介:Basedonananalysisofthemisunderstandingsandproblemsconcerningwindpowerdevelopment,thispapersummarizestheexperiencesofthecoordinateddevelopmentofwindpowerandpowergridsinforeigncountries,andproposesprinciplesandstrategiesforthecoordinateddevelopmentofwindpowerandpowergrids,andrelatedmeasuresandsuggestionsforlargescaledevelopmentofwindpowerinChina.
简介:线电压落下的效果在负担上被认为更大,特别在在大轮船的力量系统的异步的马达,变压器和另外的非线性的负担参数上。基于改进节点电压,方法被建议的一个新奇功率流动方法,和一艘典型轮船驱动系统,它有2个发电站和10个节点,与靠近环的设计但是开环的操作,作为一个例子被拿。模拟结果证明改进力量流动计算方法完成了更高的精确性和更好的集中。关键词功率流动方法-节点电压方法-异步的马达-变压器基础条款:不到资助号码60704004由国家自然科学基础支持了。HaiLan在1975出生了。他是在设计大学的哈尔滨的一个副教授。他的当前的研究兴趣包括轮船力量系统分析,控制和模拟,等等。Jiu毒牙李在1980出生了。她是在设计大学的哈尔滨的一个研究生。她的当前的研究兴趣包括轮船功率系统控制,模拟,等等。张殿华在1981出生了。他是在设计大学的哈尔滨的一个研究生。他的当前的研究兴趣包括力量系统分析,模拟,等等。
简介:Thispaperproposesahybriddecoupledpowerflowmethodforbalancedpowerdistributionsystemswithdistributedgenerationsources.Themethodformulatesthepowerflowequationsinactivepowerandreactivepowerdecoupledformwithpolarcoordinates.Second-ordertermsareincludedintheactivepowermismatchiteration,andconstantJacobianandHessianmatricesareused.Ahybriddirectandindirectsolutiontechniqueisusedtoachieveefficiencyandrobustnessofthealgorithm.Activepowercorrectionissolvedbymeansofasparselowertriangularanduppertriangular(LU)decompositionalgorithmwithpartialpivoting,andthereactivepowercorrectionissolvedbymeansofrestartedgeneralizedminimalresidualalgorithmwithanincompleteLUpre-conditioner.Typicaldistributiongenerationmodelsanddistributionloadmodelsareincluded.Theimpactofzero-impedancebranchesisexplicitlymodeledthroughreconfiguringoftheadjacentbrancheswithimpedances.Numericalexamplesonasampledistributionsystemwithwidespreadphotovoltaicinstallationsaregiventodemonstratetheeffectivenessoftheproposedmethod.
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简介:CentralBusinessDistrict(CBD),aconceptthatwasfirstproposedbyU.S.scholarsinthe1920s,referstoabusinesscenterthatfunctionsasacommercialtrading,finan-cialinformation,culturalcenter,exhibitionandofficeareaallrolledintoone:aplacethatisthecenterofbusiness,thedrivingpowerofurbaneconomicdevelopmentandthesoulofacity.
简介:Intenseclashesofinterestsandcollusionofideassprangupincessantlyamongnationsoverupwardsovereigntytransfer,interestsdistributionandmaintenanceofparityamongpartnersinthecourseofeconomicintegration.Disparitiesinsize,territory,nationalstrengthanddevelopmentlevelconceivablyoftenledtotensionsandevencrisesoverpowerdistribution.SoEUhistorycanbedescribedasoneofcrisesorcrisissettlementthroughreachinganewequilibrium,asignificantprocessforsustainedEUstability.
简介:1.AllpowersupplyunitsundertheStatePowerCorporationshallpublicizepowertariffstandardsandserviceprocedures.2.AllpowersupplyunitsoncountyorhigherlevelundertheStatePowerCorporationshallopentoservice7daysaweek.3.Powersupplysecurity,reliabilityandservicequality