山东大学博士学位论文
generatorsinEastChinamaingridincreasesalongwithincrementofpowertransmitedfromFujianpowergrid
aftertoEastChinamaingrid.DampingofthismodeisnotablyenhancedHangbeisubstationareallUHVtransmissionlinesinlost,whiledampingofoscillationmodewheregeneratorsinAnhuiandZhejiangpowergddswingagainstgeneratorsinJiangsupowergridandYangchengpowerplantdeclinessharplyafterthelost.WhetherShijiazhuangUHVsubstationislostornot,haslittleimpactonallinterarealowfrequencyoscillationmodes.
2)In
controllerpowersystemdampingcontrolresearch,systemmodelispremiseandbasisfordesign.Withrespecttomodeminterconnectedpowersystem,whichhasacharacteristicoflargescaleandvariableandcomplexoperationconditions,onlinerecursiveclosed—loopsubspaceidentification
erroralgorithm,i.e.,pastoutputerrorsinvariables-multiv&riableoutputstatespacemodelidentificationalgorithm(POEIV-MOESP),is
proposed.Itisthefirsttimethatthisalgorithmisproposedfordampingcontr01.Thealgorithmmainlyfocusonsolving‘‘identification’’in‘‘controlwhileidentification’’thought.
wellasUnderclosed-loopcondition,systeminputandoutputmeasurementnoisesas
processnoise&reeliminatedbyinstrumentalvariablewhichisformedbysystem‘‘past'’inputandoutputHankelmatrices.Then,spacespannedbythecolumnsofsystemextendedobservabilitymatrixisobtainedbymatrixorthogonal
valueprojection.Withthehelpofsingulardecomposition(SVD)andshiftinv&riantcharacteristicofextendedobservability
canmatrix,systemmatricesAandC
computed
become
trackingbederived.Thereafter,matricesBnewandDCanbeoutputdatasubspaceoutbyusingleastsquarealgorithm.Whensampledinputandavailable,extendedinstrumentalvariable—projectionapproximatec’whilealgorithm(EIV-PAST)isusedtorecursivelyupdateAandrecursiveleastsquare(RLS)algorithm
algorithmtopowerisutilizedtorecursivelyupdateasBandD.Aspectsonapplyingthesystemdampingcontrol,suchclosed loopidentifiabilityofsystemmodel,choiceofpersistentexcitationsignalandscalingfactorforsampleddata,&realsodiscussed
dampinginthisdissertation.Underthecontrolself-tuningprinciplebasedwide-areaadaptivequadraticframework,linearoptimalpartialoutputfeedbacksupplementarydampingcontrollerisdesignedbyusingonlinerecursiveclosed—loopsubspaceidentification
Thealgorithm
containssystemusealgorithm.systemdynamicresponsetoidentifyreduced-ordermodelwhichdominantlowfrequencyoscillationmodes.Thus,difficultyinobtainingpracticalsystemmodelwhichhasveryhighorderisavoided.Additionally,thealgorithmVI
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