2024年考虑高比例新能源不确定性的电力系统暂态稳定约束最优潮流报告

DrYanXuCham Tao Soon Professor in EngineeringDirector,CenterforPowerEngineeringCo-Director,SingaporePower Group-NTU Joint LabNanyangTechnological University Literature Review Proposed Methods 1.Preliminaries PowerSystemStability:Definition&Classification IEEE/CIGREjointtaskforce: "The ability of an electric power system,for a given initial operating condition,to regain a state ofoperating equilibrium after being subjected to a physical disturbance, with most system variablesboundedsothatpracticallytheentiresystemremainsintact." PowerSystem Stability:Challenges Generation side:Higher-levelintermittentrenewable energy resources Demandside: Demandresponse,distributedenergy storage units, etc. Higheroperatinguncertainties Complicatedsystemdynamics OptimalPowerFlow(OPF) u-controlvariables.suchasactivepoweroutputandyoltagesettingsofthegeneratorunitsx-statevariables(alsocalleddependentvariable),suchasbusvoltagemagnitudesandanglesaswellasbranchpowerflow,parameters,suchasloaddemand,networktopologyandnetworkparameters,whichcanbestochasticiflesspredictable,suchasthewindandsolarpoweroutputthatisnaturallyuncertain.g-equalityconstraints,i.e.,powerbalancebasedonpowerflowequationsh-inequalityconstraints.i.e.,network operating limits(suchasbranchflow limits and voltagelimits)andlimitsoncontrolvariables(suchasgeneratorcapacity). min F(x,u,y)s.t. g(x,u,y)=0h(x, u, y)≤0 OptimalPowerFlow withSecurity &StabilityConstraints Security-ConstrainedOPF (SCOPF) TransientStability-ConstrainedOPF(TSCOPF) subscriptkdenotesthekthsystemconfiguration(k=ocorrespondstopre-contingencyconfiguration,andk>ocorrespondstothekthpost-contingencyconfiguration).SCOPFonlyconsiderssteady-statesecuritycriterion,i.e.,branchflowandbusvoltage Constrainedbyatransientstabilityindex(TSl)largerthanathresholdforapre-definedcontingencylistCTheTSlcorrespondstoalargesetofdifferential-algebraicequation(DAE)thatcharacterizessystemdynamics ChallengesforTSCOPFproblems 1SelectionofaproperTSl>traditionalcriterion isthemaximumrotorangledifference,e.g.,18oo,whichishoweversystemandoperationconditiondependentimpropervaluesleadtoconservativeoroptimisticsolutions2)HandlingoftheTSl constraintsalargesetofDAEsthataremathematicallyintractableinoptimizationmodel.3)Solutionqualitycomputationspeed,optimality,convergence;compatiblewiththeindustrypractice(e.g.,industry-grademodelsandsimulationtools)4Modelingandaddressingtheuncertainties>intermittentrenewableenergyresourceshavebeenwelladdressedinScOPFproblemsbutnotTSCOPF.Besides,theloaddynamicsanditsmodeluncertaintyhasasignificantimpactontransientstability.Solutionsshouldberobustagainstsuchuncertainties.Multi-stagecoordinationfortransientstabilitycontrol>preventivecontrol(PC)beforethecontingencyandcorrectcontrol(CC)actionsafterthecontingency 2.Literature Review Thefirst(probably)paperonTSCOPF-1983 LiteratureReviewforTSCOPF Direct method Todirectlystabilizethesystemthroughcriticalcontrolvariables (e.g.,generationoutput)basedontheunderlyingstabilitymechanism. Computationflowchart Classicreferences: i[1] KS.ChandrashekharandD.J.Hill,"Dynamic Security Dispatch:BasicFormulation,"IEEETrans.PowerApparatusandSystems,1983 i[2] T.NguyenandM.A.Pai,"Dynamicsecurity-constrainedreschedulingofpowersystemsusingtrajectorysensitivities,IEEETrans.PowerSyst,2003 [3]D.Ruiz-VegaandM.Pavella,"AcomprehensiveapproachtotransientstabilitycontrolI:Nearoptimalpreventivecontrol,"IEEETrans.PowerSyst.,2003 i[4] R.Zarate-Minano,T.V.Cutsem,F.Milano,andA.J.Conejo,"Securingtransientstabilityusingtime-domainsimulationswithinanoptimalpowerflow,IEEETransPowerSyst.,2010. Discretization method Classicswingequations ModeltheTSlastheswingequations(DAEs). ConstraintherotorangleinCenterofInertia(COl)frameworkwithanempiricalthreshold. DiscretizetheDAEsintonumericallyequivalentalgebraicequationsandincorporatethemintotheOPFmodel. TSIconstraints DiscretizationofDAEs Classicreferences: [1]D.Gan,R.J.Thomas,andR.D.Zimmeman,Stability-constrainedoptimalpowerflow,"IEEETrans.PowerSyst.,200o. [2]Y.Yuan,J.Kubkawa,andH.Sasaki,"Asolutionofoptimalpowerflowwithmulticontingencytransientstabilityconstraints"IEEETrans.PowerSyst.,2003 [3] Q.JiangandZHuang,"Anenhancednumericaldiscretizationmethodfortransientstabilityconstrainedoptimalpowerflow,IEEETrans.PowerSyst.,2010. Data-driven (machine learning)method Computationflowchart Extractstabilizationrulesviamachinelearningfromatransientstabilitydatabaseandincorporatestherulesasexplicit constraints intothe ordinary OPFmodel. Thekeyistoextracteffective,accurate,androbuststabilizationrules. Classicreferences: i[1] E.S.Karapidakis,N.D.Hatziargyriou,On-Linepreventive dynamic security of isolated i[2] I.Genc,R.Diao,V.Vittal,etal,"Decision trees-basedpreventive and correctivecontrolapplicationsfordynamicsecurityenhancement inpowersystems,"IEEETrans.PowerSyst.,2010. Evolutionary algorithm(EA)-based method RunanEAtoheuristicallysearchtheoptimalsolutionsoftheTScOPFmodel,wherethestabilitycomplianceischeckedthroughTS