大规模电力系统低频振荡分析与广域自适应控制研究(7)

2025-06-15

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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