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1、USINGGRAPHTHEORYTORESOLVESTATEESTIMATORISSUESFACEDBYDEREGULATEDPOWERSYSTEMSADissertationbyJIANSHENGLEISubmittedtotheOfficeofGraduateStudiesofTexasA&MUniversityinpartialfulfillmentoftherequirementsforthedegreeofDOCTOROFPHILOSOPHYMay2007MajorSubject:ElectricalEngineeringUSIN
2、GGRAPHTHEORYTORESOLVESTATEESTIMATORISSUESFACEDBYDEREGULATEDPOWERSYSTEMSADissertationbyJIANSHENGLEISubmittedtotheOfficeofGraduateStudiesofTexasA&MUniversityinpartialfulfillmentoftherequirementsforthedegreeofDOCTOROFPHILOSOPHYApprovedby:ChairofCommittee,GarngM.HuangCommittee
3、Members,ChananSinghDonR.HalversonPaulNelsonHeadofDepartment,CostasN.GeorghiadesMay2007MajorSubject:ElectricalEngineeringiiiABSTRACTUsingGraphTheorytoResolveStateEstimatorIssuesFacedbyDeregulatedPowerSystems.(May2007)JianshengLei,B.S.,TsinghuaUniversity,Beijing,China;M.S.,T
4、singhuaUniversity,Beijing,ChinaChairofAdvisoryCommittee:Dr.GarngM.HuangPowerindustryisundergoingatransitionfromthetraditionalregulatedenvironmenttothecompetitivepowermarket.Tohaveareliablestateestimator(SE)inthepowermarketenvironment,twomajorchallengesareemerging,i.e.tokee
5、pSErunningreliablyevenunderacontingencyandtorunSEoveragridwithextremelylargesize.Theobjectiveofthisdissertationistousegraphtheorytoaddresstheabovetwochallenges.TokeepSErunningreliablyunderacontingency,anoveltopologicalapproachisfirstproposedtoidentifycriticalmeasurementsan
6、dexaminenetworkobservabilityunderacontingency.Toadvancetheclassicaltopologicalobservabilityanalysis,anewconceptofcontingencyobservabilitygraph(COG)isintroducedanditisproventhatapowersystemnetworkmaintainsitsobservabilityunderacontingencyifandonlyifitsCOGsatisfiessomecondit
7、ions.AsanapplicationofCOG,atwo-stageheuristictopologicalapproachisfurtherdevelopedbasedonthenewconceptofqualifiedCOG(QCOG)tominimizethenumberofmeasurementsandRTUsundertheconstraintthatthesystemremainsobservableunderanysinglecontingency.ToovercomethedisadvantagesofexistingS
8、Eoverextremelylargenetworks,atextureddistributedstateestimator(DSE),whichconsistsoftheoff
