1,2,2,1,Q.H.WU3,4(1./,210003;2.,210096;3.TheUniversityofLiverpool,LiverpoolL693GJ,UK;4.,530004):/,,,,,:;;;;;:TM712:2009202211(50595413);(SGKJ[2007]98&187&2009)0[1],,,(UFLS)/(UVLS),,(),,,,,()(LS)(),,UFLS/UVLS,:UFLSUVLS;;;LS;,,;,[2],[3],LS,,LS,UFLS/UVLS,:LSLSUFLSUVLS1LS,LS,LS,,,LSLS0013392009510Vol.33No.9May10,20091.11):,,LS;,LS122[4],LS2):LS[5][6]3):,[7],[3]LS,LS[8]LS,LS1.2,LS[9]:T,Vmin,Tcr.i[2][(fcr.1,Tcr.1),(fcr.2,Tcr.2),,(fcr.i,Tcr.i)](),((500.2)Hz,):fd=[fmin.i-(fcr.i-kTcr.i)]100%(1):fmin.ii;k,(fcr.i,Tcr.i)((fcr.i-kTcr.i),0),(),(P2V)1.3(),()[10],;,,,1.4,LS,,LS,,[11],,1.5,UFLS/UVLS,,[12]1.6,[7][13]1.7LS,1.81.8.1,,LS,,,LS,,,,LS,LS,,[14]101,(VIPI)[15],L[16][17](VIP)[18],[19],1.8.2,;,;,,LS[20]2,UFLSUVLS,2.1UFLS/UVLS,,LS,,,,,2.2,LS,,,UFLSUVLS,2.2.1UFLSUFLSLS,LS[21],;[22]LS;[23];[24],LS,LSLS2.2.2UVLS1),:[25];,[26];VIP,LS[27];Q2V;[28];LSLS;2),[3][7]2.3LS,(,),LSLS,,,LSLS,,LS,2.41),,:,,2),UFLSUVLS0.2s0.3s,UVLS[29],3)LSLS,,LS,LS,2012009,33(9),,2.5LSLSUFLS,UVLS,,,;,,,,3LS,,,,LSLS,,[9][6];,[25],,,,4UFLS4.1[30]4.1.137,0.2Hz0.3Hz,0.2s0.3s2:,;,[31],UFLS[32],[33],:,[34]4.1.2,,1,[35];[36];,4.1.3[37],,[38],,[39],,LS[40]LS,,,,,,[41]UFLS[42]LS,,LS4.24.2.1[24],[43],,,UFLS,301,,4.2.2LS,LS,,,;LS,,LS[34]4.2.3UFLS,[44],LS,,LS,[6],LS,LSLS,LS[5],[45]Benderps,LS[8]4.2.4(1)/,[3]UFLS,,5UVLS5.1UVLS,,,5.1.1LS,LS[25],LSLS,LS[4]N-1,N-2N-3LS,LSLS122[46],5.1.21),,UVLS,[47]:LS,LS[28][48],UVLS[46]2)Q2V[49],,,LS,LS3)VIPI[15]VIPI,LS4)L[16]2,L5)VIP,,[18]6)PV[17]7)/0,UVLS0,[4]5.1.34012009,33(9),,[13]5.2UVLSUVLSUVLS[3,9]61),LS(),LS,2)[7],UFLS/UVLS,,LS,,3)UFLSUVLSUFLSUVLS,,,,4),UFLS7UFLSUVLSLSLSLSLS,,,,,[1].:(),(),().,2006,30(1):8216;2006,30(2):1210;2006,30(3):1210,106.XUEYusheng.Space2timecooperativeframeworkfordefendingblackouts:Part,,.AutomationofElectricPowerSystems,2006,30(1):8216;2006,30(2):1210;2006,30(3):1210,106.[2]..:,1999.[3],,,..,2003,27(22):12215.XUTaishan,LIBijun,BAOYanhong,etal.Optimalparameter2settingofunderfrequencyandundervoltageloadsheddingfortransientsecurity.AutomationofElectricPowerSystems,2003,27(22):12215.[4]MOORSC,LEFEBVRED,VANCUTSEMT.Designofloadsheddingschemesagainstvoltageinstability//ProceedingsofIEEEPowerEngineeringSocietyWinterMeeting:Vol2,January23227,2000,Singapore:149521500.[5]CHENGCP,CHENS.Under2frequencyloadsheddingschemedesignbasedoncost2benefitanalysis//Proceedingsofthe6thInternationalConferenceonAdvancesinPowerSystemControl,OperationandManagement:Vol2,November11214,2003,HongKong,China:5142518.[6]HALEVIY,KOTTICKD.Optimizationofloadsheddingsystem.IEEETransonEnergyConversion,1993,8(2):2072213.[7],,DONGZhaoyang,..,2007,31(14):127.XUEYusheng,LIUQiang,DONGZhaoyang,etal.Areviewofnon2deterministicanalysisforpowersystemtransientstability.AutomationofElectricPowerSystems,2007,31(14):127.[8],,DONGZhaoyang,..,2007,31(12):30235.LUOYunhu,XUEYusheng,DONGZhaoyang,etal.Hybridoptimizationofgenerationcapacityadequacy.AutomationofElectricPowerSystems,2007,31(12):30235.[9].[D].:,2004.[10]LADHANISS,ROSEHARTW.Undervoltageloadsheddingforvoltagestability:overviewofconceptsandprinciples//ProceedingsofIEEEPowerEngineeringSocietyGeneralMeeting:Vol2,June6210,2004,Denver,CO,USA:159721602.[11],,,.:().,2006,30(14):10213,61.MAChanghui,XUEYusheng,WANGXiaoying,etal.Optimaltransmissionplanningbasedonbothstaticanddynamicrisks:Parttwowithuncertaininjectionpower.AutomationofElectricPowerSystems,2006,30(14):10213,61.[12]XUEY,LIW,HILLDJ.Optimizationoftransientstabilitycontrol:Partforcaseswithdifferentunstablemodes.InternationalJournalofControl,AutomationandSystems,2005,3(2):3412345.[13]WANH,MCCALLEYJD,VITTALV.Riskbasedvoltagesecurityassessment.IEEETransonPowerSystems,2000,15(4):124721254.501,[14]ARYALD,PANDEVS,KOTHARIDP.Atechniqueforloadsheddingbasedonvoltagestabilityconsideration.ElectricalPowerandEnergySystems,2005,27(7):5062517.[15]ESAKAT,KATAOKAY,OHTAKAT,etal.VoltagestabilitypreventiveandemergencypreventivecontrolusingVIPIsensitivities//ProceedingsofIEEEPESPowerSystemsConferenceandExposition:Vol1,October10213,2004,NewYork,NY,USA:5092516.[16]KESSELP,GLAVITSCHH.Estimatingthevoltagestabilityofapowersystem.IEEETransonPowerDelivery,1986,1(3):3462354.[17]NANDAA,CROWML.Anenergybasedapproachtoundervoltageloadshedding.ElectricPowerSystemsResearch,1995,32(1):11218.[18],.SMARTDevice.,2006,30(21):57260.YUWenjie,FANGYongjie.AnundervoltageloadsheddingmethodbasedonSMARTDevice.AutomationofElectricPowerSystems,2006,30(21):57260.[19]MOORSC,LEFEBVRED,VANCUTSEMT.Loadsheddingcontrollersagainstvoltageinstability:acomparisonofdesigns//ProceedingsofIEEEPortoPowerTechConference:Vol2,September10213,2001,Porto,Portugal:149521500.[20],,,..,2006,30(20):26231.WUJun,TUGuangyu,LUOYi,etal.Hierarchicalloademergencycontrolofpowersystem.AutomationofElectricPowerSystems,2006,30(20):26231.[21],,..,2005,25(19):48251.XIONGXiaofu,ZHOUYongzhong,ZHOUJiaqi.Studyofunderfrequencyloadsheddingschemebasedonloadfrequencycharacteristics.ProceedingsoftheCSEE,2005,25(19):48251.[22]PERUMALN,YINGCC.Aproposedstrategyofimplementationforloadsheddingandloadrecoverywithdynamicsimulations//ProceedingsofPow