电力系统暂态分析.ppt

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1、NegativeSide:DirectMethodIntroductionsDefinition:UsePowerSystemTransientCharacteristicsFunctionToDescribeOrAnalyzeThePowerSystemTransientStabilityFirstIntroducedInThe1950sThanksToAthayAndKakimoto’sWork,TheDirectMethodGotRapidDevelopment.ClassificationsClassicalModelDirectMethodComplexModelEner

2、gyFunctionMethodTSEFAccelerationMethodRVEPPSEFLyapnoyFunctionMethodPEBSIMEFEEACTSDLyapnoyFunctionMethod:DengDashangPotentialEnergyBoundarySurface(PEBS):JiangTengIndividualMachineEnergyFunction(IMEF):FangLueExtendedEqual-areaCriterion(EEAC):JingTianApplications:MuhammadHamidConclusion:HuangYupe

3、ngAnAnalogyOfRollingBallModelRollingballmodelpointsTheareainsidetheballrepresentsthestabilityregionandtheoutsiderepresentstheinstabilityregion.Initiallytheballisrestingatthebottomofthebowl,thestateisreferredtoasstableequilibriumpoint(SEP).Whenkineticenergyisinjectedtotheball,theballwillrollupi

4、nsidethesurfaceofthebowl.Thepointwheretheballwillstopisgovernedbytheamountofkineticenergyinitiallyinjected.Iftheballconvertsallitskineticenergyintopotentialenergybeforereachingtherim,thenitwillrollbackandeventuallysettledownatthestableequilibriumpointagain.Ifthekineticenergyishighenoughtocause

5、theballtogoovertherim,theballwillentertheregionofinstability.Applicationtopowersysytem:ThebasisfortheapplicationoftheTEF(TransientEnergyFunction)methodtotheanalysisofpowersystemstabilityisconceptuallysimilartothatforaballrollinginabowl.Initiallythesystemisoperatingatastableequilibriumpoint.Ifa

6、faultoccurs,theequilibriumisdisturbedandthesynchronousmachinesaccelerate.Thepowersystemgainskineticandpotentialenergyduringfault-onperiodandthesystemmovesawayfromtheSEP.Afterfaultcleared,thekineticenergyisconvertedintopotentialenergyinthesamemannerastheballrollingupthepotentialenergysurface.To

7、avoidinstability,thesystemmustbecapableofabsorbingthekineticenergyatatimewhentheforcesonthegeneratorstendtobringthemtowardnewequilibriumpositions.Thisdependsonthepotentialenergy-absorbingcapabilityofthepost-disturbancesystem.Foragivenpo