dynamic load models for power systems

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1、DynamicLoadModelsforPowerSystemsEstimationofTime-VaryingParametersDuringNormalOperationInésRomeroNavarroLicentiateThesisDepartmentofIndustrialElectricalEngineeringandAutomationiDepartmentofIndustrialElectricalEngineeringandAutomationLundUniversityP.O.Box118SE-

2、22100LUNDSWEDENhttp://www.iea.lth.seISBN91-88934-26-8CODEN:LUTEDX/(TEIE-1034)/1-166/(2002)©InésRomeroNavarro,2002PrintedinSwedenbyMedia-TryckLundUniversityLund,2002iiAbstractEconomicandenvironmentalconcernswillslowdowntheexpansionofthetransmissionsysteminmanyc

3、ountries.Theadditionofnewtransmissionlineswillbefewandfarbetween.Thede-regulationofthepowersupplywillintroducenewpowerflowpatternsonthebulktransmissionsystems.Thenetresultisthatthepowersystemswilloperatemuchclosertotheirtransferlimitsandoperatetheremuchlongert

4、imethanhasbeennecessary.Theriskforvoltagecollapsedeterminesthetransferlimitsinmanybulktransmissionsystems.Theaccuratedeterminationofthetransferlimitswillbeanincreasinglyimportanttasktomaintaintheoperationalsecurityandeconomicoperationofthepowersystem.Manystudi

5、eshaveshowntheimportanceoftheloadrepresentationinvoltagestabilityanalysis.Staticloadmodelsarenotaccurateenoughforcapturingthedynamicsofthenetwork.Thereforedynamicloadmodelsareneededevenifvoltagecollapse,inmanycases,isaslowphenomenon.Duetothelargeamountofelectr

6、icheatingloadsinSwedenanditseffectonvoltagestability,HillandKarlssonhaveproposedaloadmodelwithexponentialrecovery.Themodelisexpressedasasetofnonlineardifferentialequations,wheretherealandreactiveloadpowershaveanonlineardependencywithvoltage.Thestandarddynamica

7、ctiveloadmodelischaracterizedbythreeparameters,steadystateload-voltagedependence,transientload-voltagedependenceandaload-recoverytimeconstant.Thesameappliestoreactiveload.Asanextensionofthementionedwork,thepresentauthorproposesanautomaticmethodforthedeterminat

8、ionofparametersinstandarddynamicloadmodels.Thedynamicsetofnonlinearequationshasbeenlinearisedandtheproblemhasbeenreducedtoalinearidentificationproblem.TheLeastSquarescriterionisuse