大规模电力系统低频振荡分析与广域自适应控制研究(8)

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hasgoodnumericalstabilityandlowtimecomplexity,whichprovidesbasisfor‘‘control’’in“controlwhileidentification”thought.

SimulationresultsoftheChinaEPRI8-machine36-bussystemdemonstratethattheproposedon -linerecursiveclosed- loopidentificationalgorithmCaneffectivelyidentifyand

lowfrequencytrackreduced.orderstatespacemodelwhichcontainssystem

oscillationmodes,anddominantCanbeusedtoadjustparametersofsupplementarydampingcontrolleron-line.Additionally,supplementarydampingcontrollerCaneffectivelydampsystemintearealowfrequencyoscillations.

3)Witll

intotheregardstoshortcomingofoptimalcontrolwhichcannottakecontrolconstraintsadaptiveoptimization,wide-areadampingcontrolstrategybasedonmodelpredictivecontrol(MPC)isproposed,whichattempts

identification'’thought.Basedontosolving‘‘control’’in‘‘controlwhileidentifiedmodel,systemoutputdisturbancemodelis

topreventoutputsobtainedbyaugmentingsystemstateswithoutputdisturbances

steady.stateoffsets.Kalmanfilterisused

Accordingtotofromestimatestatestheaugmentedmodel.theidentified

anmodel,predictiveequationsforclosed loopsystemarefunctionrepresentingformulated.Thenobjectivethecostofdeviationofsystem

responsesfromthereferencetrajectoryandthecostofimposingdampingcontrolsin

oninfinitehorizonisestablished.Consideringconstraintscontrolinput,optimalcontrol

usesCanbeobtainedbysolvingthisoptimalcontrolproblemwhichcurrentstateofpower

aresystemastheinitialstate.Onlinemodelidentificationandcontroloptimizationrepeated

ineachtimeinterval.Theproposedmethodisanorganicintegrationofonlinemodelidentificationandonlineupdatingcontrol

powersystemlowfrequency

、析thfixed

controlparameters.Itareaccomplishesadaptivecontrolofoscillation.Thus,theofflineidentificationtovariationinherentshortcomingsofcontrollersparametersbasedonovercomeandtheproblemoftheperformance

aredegradationdueofthecomplexoperationconditionsandtime-varyinganduncertaincharacteristicofsystemofcontrolparametersaresolved.Negativeeffectsavoidedbyadoptingmodelprediction,recedingoptimizationandfeedback

.compensationstrategyinthismethod.

SimulationresultsoftheChinaEPRI8-machine36-bussystemdemonstratethattimeconsumptionforupdatingofsystem

lessthanstatespacemodelandmodelpredictivecontrollawissamplinginterval.Thus,modelpredictivedampingcontrollerssatisfyrequirementsforonlineapplication.It

oscillationmodes.ItalsoCaneffectivelydampinter-arealowfrequencytohavetheabilitycoordinatewithPSSsandothermodelⅥI

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