简介：IntroductionAnalysisandforecastofloadcharacteristicsareimportantaspectsinpowermarketanalysisandprediction.Correctlymasteringgridloadcharacteristics

简介：Atthebeginningof2008,theCentral,EastandSouthChinasufferedararesnowandicedisaster.Afterthedisaster,powergenerationandpowergridenterprisesfacedabigproblemofpowercoalsupply.

简介：ThispaperpresentsthedataonoperationreliabilityindicesandrelevantanalysestowardChina'sconventionalpowergeneratingunitsin2009.Theunitsbroughtintothestatisticalanalysisinclude100-MWorabovethermalgeneratingunits,40-MWorabovehydrogeneratingunits,andallnucleargeneratingunits.Thereliabilityindicesembodiedincludeutilizationhours,timesandhoursofscheduledoutages,timesandhoursofunscheduledoutages,equivalentforcedoutagerateandequivalentavailabilityfactor.

简介：Basedontheanalysisandcomparisonofcoal,oilandwaterconsumptionsinthermalpowerplants,thispaperintroducesthepresentstateofresourcesutilizationinthermalpowerindustry,andpointsoutthatthepoten-tialofresourcessavingliesmainlyincuttingdowncoalconsumptionandincreasingtheratiooflarge-sizedthermalunits.Measuresandsuggestionsforupgradingresourcesutilizationareputforward,suchastooptimizecoal-firedthermalpowerstructure,developcogeneration,cleancoalcombustiontechniquesandgas-steamcombinedcycletechniques.Theexistingthermalpowerplantsshallexecutetechnicalretrofitsandpopularizewatersavingtechniques.

简介：ThestatisticdataofresidentialelectricityconsumptionshowninthetableP.58arequotedfromtheEnergyStatisticalYearBookpublishedbytheNationalStatisticBureauandthestatisticsissuedbytheMinistryofEnergy.Thereasonofthedifferencesbetweenthedatafromthetwosaidsourcesisthatthelatterdoesnotincludetheconsumptionsup-pliedbythelocalsmallpowersources.Fromthestatisticaldatawecanseethat:

简介：I.IntroductionA31.2km110kVtransmissionlineisdesignedtooperateunder35kVwithconductormodelAC-185(aluminiumstrand--28x2.87mm~2,steelcore--7x2.50mm~2)ataverageoper-atingstressof24.2%,andoverheadgroundwiremodelC-50(steelstrand--7x2.97mm~2)ataverageoperatingstressof20.6%.Thewholelinehas130pole-towers,mostofwhichareofprestressedconcretedouble-polestructure,asshowninFig.1.The

简介：IntroductionWithever-increasingofpowersources,thecapabilityofpowersupplywasfurtherenforcedin2007.Thismetthestrongdemandofnationaleconomydevelopment.Restruc-turingofpowersourceswasdeepening,ofwhich"substi-tutinglargepowerunitsforsmallones"startedwell,theinstalledcapacityofwindpowerwasdoubledandobviousresultswereachievedintheenergy-conservationandpollu-

简介：1.IntroductionConductorgallopinghascausedmoreandmoredisturbancestothesecureoperationofpowersystemfrom1930untilnow.Al-thoughmanyauthorshavebeenstudyingitstheoryandpreventivemeasuresbywind-tunnelandfieldmodellingtestsandgettingsome

简介：InJanuary2008,asuddendisastercausedbyicingandsnowinghappenedinlargeareasofCentralChinaandSouthChina.TheequipmentsofHunanpowergridwereseriouslydamagedduringtheicingandsnowingdisaster.AnexpertgroupfromChinaElectricPowerResearchInstitute(CEPRI)wasorganizedandwenttoHunanprovinceforfieldinvestigation.Asasummaryofthisinvestigation,thispaperintroducespowerequipmentdamages,suchasflashovercausedbyicing,collapseoftowers,conductorbreakageanddamageofsubstationequipments.Thecountermeasuresadoptedforthisicingandsnowingdisasterarealsosummarized.Theanalysisshowsthattheraremeteorologicalconditionisthemainreasonforlarge-areadamageofHunanpowergrid.IntheicingdisasterofHunanpowergrid,theicethicknessgreatlyexceedsthepermissiblelimitofdesign,thusitisnecessarytoimprovethedesignparametersreasonablytoagainsticingoftransmissionlines,andthedesignofexternalinsulationandtheanti-icingtechnologyforsubstationsarealsoneedtobeenhanced.

简介：1.Speedupthedevelopmentofthefifthenergyresource-electricalenergy-savingTheworldexperiencedseriousenergycrisestwiceinthe1970’s,butthesituationwasalleviatedatthebeginningofthe1980s.Comprehensivereportspublishedbyinternationalenergyorganiza-tionsin1986summeduptheimportantachievementsofenergy-sav-ingobtainedin19mainindustrializedcountriesintheperiodof1973to1985.Theirprimaryexperienceistobringaboutthestructuralenergy-savingbyrelyingonthetechnicalprogress,thatis,changingthehighenergyconsumptionindustriestolowconsumptionones.Thischangetidedthemsuccessfullyovertheenergycrises,moreo-

简介：Sincethefirstbatchof350-MWsupercriticalutilityboilerswasputintooperation,theexhaustfluegastemperatureoftheboilershasalwaysbeenhigherthanthedesignedvalue.Themainreasonisthattheheatabsorbedbytheairheaterisnotsufficient.InHuanengDongfangPowerPlant,theexhaustfluegastemperatureisloweredthroughmodificationstotheeconomizerandtheairheater.Theexperimentalresultsrevealthateveryyear,eachboilercouldsave3850tonsofstandardcoalandreduce85tonsofSO2and9000tonsofCO2respectivelyafterretrofit.

简介：<正>ThepaperoutlinestheYangtzeThreeGorgeswaterconservancycomplex.ItdescribesthepowertransmissionanddistributionequipmentintheThreeGorgesLeftBankHydropowerStation,especiallylargehigh-voltagedistributiondevices.ItelaboratesthemeasuresforsuppressingGISover-voltageandthetestsonVFTO,besidestechnicalmeasurestoensuresafetyandstabilityofpowersysteminthestation.Italsomakessomeanalysesandsummariesabouttheproblemsencounteredinoperationoftheequipment.

简介：SummaryThispaperanalysestheturbinebypasssystemdesignandoperationmodefordomesticallymade300MWunitwithtechnologyimported,andputforwardsomesuggestionsaboutwhetherbypasssystemisneeded.1.0IntroductionThedomesticallymadeWHCo,patent300MWunitisproducedaccordingtothetechnologyofAmericanWestinghouse(WH)Corporation.Theoriginalimported

简介：ThispaperpresentsthebehavioranalysisofmodularmultilevelconverterunderDCpole-to-poleshort-circuitfault,whichisanimportantissueinfaultmanagement,electricalsystemdesignandMMCbasedpowersystemprotectionandcontrol.Firstly,thetransientbehaviorisanalyzedandtheconductionoverlappingangleγisdefined.Secondly,sevenpossibleshort-circuitcurrentpathsinducedbydifferentγvaluesareidentified,andthecorrespondingengineeringshort-circuitcurrentcalculationmethodsforbothACandDCsidesareproposed.Andthen,theinfluencesofimpedancedistributionfactorkandequivalentshort-circuitresistanceRSConshort-circuitcurrentsareelaborated.Finally,casestudyisusedtoverifytheeffectivenessoftheproposedanalysismethods.

简介：Basedonthecalculationandanalysisofenergy-savingbenefitundervariousoperatingconditions,andtheinvestmentpaybackperiodforthelowpressureeconomizerofthe3rdstageprojectofLongkouPowerPlant,theoptimumoperatingconditionsofthesystemanditsreasonableheatingsurfacearedefined,andthefeasibilityofthedesignalternativeofthelowpressureeconomizersystemisverified.