Thesis - Methods for online voltage stability monitoring

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1、MethodsforOnlineVoltageStabilityMonitoringbyMaheshJungKarkiAthesissubmittedtothegraduatefacultyinpartialfulfillmentoftherequirementsforthedegreeofMASTEROFSCIENCEMajor:ElectricalEngineeringProgramofStudyCommittee:VenkataramanaAjjarapu,MajorProfessorDionysiosAliprantisSigurdurOlafssonIowaS

2、tateUniversityAmes,Iowa2009Copyright©MaheshJungKarki,2009.Allrightsreserved.GraduateCollegeiiTABLEOFCONTENTSLISTOFTABLESvLISTOFFIGURESvi1INTRODUCTION11.1Overview11.2ScopeofWork21.3ThesisOutline32ELEMENTSOFVOLTAGESTABILITYANALYSIS42.1Overview42.2PVCurves42.2.1PVCurveTracing62.2.1.1Continu

3、ationPowerFlow(CPF)Method72.3QVCurves112.4LoadModelsandDynamics132.5GeneratorExcitationLimits142.6TypesofVoltageInstabilities152.7VoltageStabilityDynamicsUsingNetworkandLoadPVCurves162.8Conclusion173REVIEWOFONLINEVOLTAGESECURITYMONITORING193.1Overview193.2IndexBasedVoltageInstabilityMeas

4、ure213.2.1IndexfromDirectPhasorMeasurements213.2.2IndexfromLoadFlowJacobian243.2.3OtherTechniques25iii3.3ArtificialIntelligenceTechniques273.4Conclusion294VOLTAGESTABILITYMARGINPREDICTIONUSINGREACTIVEPOWERAVAILABILITY304.1Overview304.2BackgroundandMotivation324.3ProposedMethod364.3.1TwoB

5、usSystem384.3.2MultipleBusSystem384.3.3DeterminationofReactivePowerLoss394.3.4Issues424.3.4.1ApplicationoftheMethodinLargeSystems424.3.4.2AlgorithmtoDetermineVCAandParticipationFactors434.3.4.3ApplyingVoltageControlArea454.4OnlineImplementationoftheMethod454.5ResultsandAnalysis484.6Concl

6、usion575ATTRIBUTESELECTIONFORONLINEVOLTAGESTABILITYMONITORINGUSINGDECISIONTREES585.1Overview585.2Motivation595.3DecisionTree615.3.1DecisionTreeBuilding645.3.2IssueswiththeTree675.4MethodsofAttributeSelection685.4.1GainRatioAttributeEvaluation69iv5.4.2ReliefAttributeEvaluation715.4.3Wrapp

7、erSubsetEvaluationUsingNaïveBayesLearner715.5PowerSystemPointofViewoftheAttributes735.6DecisionTreeImplementationinVoltageStabilityMonitoring745.7DataGeneration765.7.1VoltageStabilityCriteria785.7.2TestSystem805.8TangentVectorCalculation835.9ResultsandAnalysis865.8Conclus