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某250MW抽水蓄能机组典型大波动过渡过程试验分析.docx

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某250MW抽水蓄能机组典型大波动过渡过程试验分析 Abstract: Thelargedisturbancetransitionprocessofa250MWpumpedstorageunitwasanalyzedthroughtheexperimentaltest.Thetestresultsshowthattheunithasgooddynamiccharacteristicsandcanmaintainstableoperationduringthetransitionprocess.Theanalysisofthetestresultsprovidesvaluablereferencedatafortheoperationandmaintenanceofsimilarunits. Introduction: Pumpedstoragepowerplantsareanimportanttypeofenergystoragesystem.Theyhavetheadvantagesofefficientenergystorageandrelease,frequencyregulationandpeakshaving.However,theoperationofthepumpedstorageunitisaffectedbymanyfactors,suchasexternalgriddisturbance,loadfluctuation,andinternalequipmentfailure.Therefore,itisnecessarytoconductexperimentalteststoanalyzethedynamicperformanceofthepumpedstorageunitandevaluateitsoperationalreliability. Inthispaper,thelargedisturbancetransitionprocessofa250MWpumpedstorageunitwasanalyzedthroughanexperimentaltest.Thetestresultsprovidevaluabledatafortheoperationandmaintenanceofsimilarunits. ExperimentalTest: Theexperimentaltestwascarriedoutunderthefollowingconditions: -Theunitwasoperatedinpumpingmodewitharatedpowerof250MW; -Thewaterlevelintheupperreservoirwasatthenormaloperatinglevel; -Thewaterlevelinthelowerreservoirwasatthemaximumoperatinglevel; -Thegeneratingunitwasoperatingwithastableloadandfrequency. Thelargedisturbancetransitiontestwasperformedbythefollowingsteps: -Step1:Increasetheloadofthegeneratingunitto80%oftheratedpower,andmaintainitfor10minutes; -Step2:Reducetheloadofthegeneratingunitto60%oftheratedpowerandmaintainitfor10minutes; -Step3:Cutofftheexcitationpowerofthegeneratingunit,andmaintaintheloadfor20seconds; -Step4:Restoretheexcitationpowerofthegeneratingunit,andmaintaintheloadfor20seconds; -Step5:Increasetheloadofthegeneratingunitto90%oftheratedpower,andmaintainitfor10minutes; -Step6:Reducetheloadofthegeneratingunitto70%oftheratedpower,andmaintainitfor10minutes. Duringthetest,thewaterlevelintheupperandlowerreservoirs,thegeneratorspeed,activepower,andreactivepowerwereallr