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1、PowerSystemDynamics--PostgraduateCourseofTsinghuaUniv.GraduateSchoolatShenzhenNIYixinAssociateProfessorDept.ofEEE,HKUIntroduction0.1Requirementsofmodernpowersystems(P.S.)0.2RecenttrendsofP.S.0.3ComplexityofmodernP.S.0.4DefinitionsofdifferenttypesofP.S.stabi
2、lity0.5Computer-aidP.S.stabilityanalysis0.6ContentsofourcourseIntroduction(1)0.1Requirementsofmodernpowersystems(P.S.)Satisfyingloaddemands(asapowersource)Goodquality:voltagemagnitude,symmetricthreephasevoltages,lowharmonics,standardfrequencyetc.(asa3-phaseacvoltagesource)E
3、conomicoperationSecureandreliableoperationwithflexiblecontrollabilityLossofanyoneelementwillnotcauseanyoperationlimitviolations(voltage,current,power,frequency,etc.)andalldemandsarestillsatisfied.Forasetofspecificlargedisturbances,thesystemwillkeepstableafterdisturbances.Go
4、odenergymanagementsystems(EMS)Introduction(2)0.2RecenttrendsofP.S.Systemsinterconnection:toobtainmorebenefits.Itmayleadtonewstabilityissues(e.g.low-frequencypoweroscillationonthetielines;SSRcausedbyseries-compensatedlinesetc.).Systemsareoftenheavilyloadedandverystressed.Sys
5、temstabilityunderdisturbancesisofgreatconcern.Newtechnologyapplicationsinpowersystems.(e.g.computer/moderncontroltheory/optimizationtheory/IT/AItech.etc.)Powerelectronicsapplications:providesflexiblecontrollerinpowersystems.(e.g.HVDCtransmissionsystems,STATCOM,UPFC,TCSC,etc
6、.)Introduction(3)0.3ComplexityofmodernP.S.Largescale,Hierarchicalanddistributedstructure,Non-storableelectricenergy,Fluctuateandrandomloads,Highlynonlineardynamicbehavior,Unforeseenemergencies,Fasttransientswhichmayleadtosystemcollapseinsecondsorminutes,Complicatedcontrolan
7、dtheircoordinationrequests.--ModernP.S.ismuchmorecomplicatedthaneverandinthemeantimeitplaysasignificantroleinmodernsociety.Introduction(4)SomeviewpointsofDr.Kundur(authoroftheref.book):---Thecomplexityofpowersystemsiscontinuallyincreasingbecauseofthegrowthininterconnections
8、anduseofnewtechnologies.Atthesametime,financialandregulatoryconstrainshaveforcedut
