期刊网_中国期刊网

Investigation on Frequent Wind Power Off-Grid Fault

简介：Withthecommissioningofthe750-kVHexipowertransmissionandtransformationproject,thefirststageofthe10-GWclassJiuquanWindPowerBaseprojectwascompletedandputintooperationthisyear.However,disconnectionsinvolvingsomewindturbinestookplacequiteafewtimesinJiuquanrecently,whichhavecausedsignificantimpactsonthepowergridanddrawnextensiveattentionsbothdomesticallyandabroad.TakethetypicalfaultsinJiuquanforexamples,thebasicsituationsarepresentedandthecausesofthefaultonFebruary24thareanalyzed.Thenthecorrespondingsolutionsareputforwardafterwards.
标签： WIND power FAULT analysis SOLUTION

全文阅读

Investigation and Analysis of Ice and Snow Disaster Suffered by Hunan Power Grid in 2008

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

全文阅读

Investigation and recommendation on allowable operating duration of large-sized turbine-generator unit under abnormal frequency

简介：1.IntroductionWiththeincreasingofturbo-generator(TG)capacity,thelimi-tationontheabnormalfrequencyoperationisgrowingmorerestric-tive.InordertoensurethesafetyoperationofcertainTGunit,splitingdevicewhichisolatesthegeneratingunitfromthesystemisem-ployedwhenthesystemfrequencyisdeclinedtoacertainextent.However,duringthedegradationoffrequency,toisolatethelarge-sizedTGunitfromthepowersystemwillcausethesystemfre-quencytofurtherdecline.Hence,howtousethelowfrequencysplit-tingprotectionproperlyandhowtocoordinatetheoperationofunderfrequencyloadshedding(UFLS)withunderfrequencygeneratorsplitting(UFGS)aresignificantforsecuringthesafetyoperationof
标签： sized generator turbine abnormal declined turbo

全文阅读