Presentation - Long-term dynamics of power systems

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1、Long-termdynamicsofpowersystemsIEATopicalExpertMeeting#449-10.11.2004DublinSannaUski&BettinaLemström2VTTTECHNICALRESEARCHCENTREOFFINLANDTypesofpowersystemsimulations´Steadystate–powerflow–voltagestabilityanalysis(PV-,VQ-curvesetc.)–faultcurrentcalculation´Longtermdyn

2、amics´Stability–impactoffaults,disturbancesonthepowersystem–largevoltageandfrequencyexcursions–alsounstablesituations´Electromagnetictransients–faults,switching-events,protection–localstudiesVTTPROCESSES3VTTTECHNICALRESEARCHCENTREOFFINLANDPhenomenaTimescaleResearchto

3、olsVTTPROCESSES4VTTTECHNICALRESEARCHCENTREOFFINLANDLongtermdynamics´realbehaviourofthepowersystemduringaperiodoftimerangingfromtensecondstohours´includes–electromechanicalrotortransients–turbineandboilerdynamics–protection–automation–centralisedcontrolleractions–load

4、change–powerplantandsystemoperatoractionsVTTPROCESSES5VTTTECHNICALRESEARCHCENTREOFFINLANDTool:PSS/E&Extendedtermdynamics-module´usesmainlysameinputasordinaryPSS/Edynamicmodelling´possibletoinclude–transformertapchangers–boilereffects–actionofexcitationlimiters–switch

5、ingofcapacitorsandreactors–restorationofloadsetc.´suitabletoolforstudying–secondarycontrol–powerplantdispatch–voltageandfrequencyvariations–transmissioncapacityandbottlenecksVTTPROCESSES6VTTTECHNICALRESEARCHCENTREOFFINLANDTool:PSS/E&Extendedtermdynamics-module´timest

6、episuser-definedandcanvaryduringthesimulation´threedifferentmodesdependingontimestepinordertoincludehigh-frequencycharacteristicsindifferentdegree:–forsmalltimestep(~halfcycle)–formediumtimestep(~threetosixcycles)–forlargetimestep(~0,15-0,2s)´additionalmodels:–Online

7、TapChanger–OnlinePhaseShifter–dcLineTapChanger–MaximumExitationLimitersVTTPROCESSES7VTTTECHNICALRESEARCHCENTREOFFINLANDSimulationexample´Sintef23-generatormodel–loadsat25nodesGGG–basecaseconsumption49.5GWG–loadsmodelledas–P:40%constantZ,GG60%constantIGGG–Q:100%consta

8、ntZGGGGGG´AdditionalwindpowerGGGG–5GWinmid-Norway–modelledasnegativeP-loadGG–100%constantpowerGGVTTPROCESSES8VTTTECHNICALRESEARCHCE