基于暂态电气量超高压输电线路高阻接地保护算法的研究

上海交通大学硕士学位论文基于暂态电气量超高压输电线路高阻接地保护算法的研究姓名：衣书伟申请学位级别：硕士专业：电力系统及其自动化指导教师：郁惟镛200512015msATPTHEPROTECTFORHIGHRESISITANCEEARTHFAULTOFSUPERPRESSUREPOWERTRANSIMISSIONLINEBASEDONTRANSIENTCOMPONENTABSTRACTGenerally,transmissionlinefaultcancausebothhighphasecurrent.Propergroundingprotectionsetcanactreliablyandcutofffault.However,someuniquegeographicalcharacters,suchasfiregrounding,bamboogroundingandtreetopgrounding,cancausesinglephasehigh-impedancegroundingfaultfrequently.Sincethevoltageandthecurrentdropdownverylittle,themainprotectionofthefaultlinecan’tcutoffthefaultquicklyandaccurately.AtthepresenttimeDomesticandinternationalrelaymanufacturertohightohinderearthtroubleyethaveabettertechnologicalmeasuretoprotect,distanceprotecttohightohinderearthtroubledistanceisitisittripandhavemoredifficultdiscriminationstotroublepositiontoselecttoprotect.Differenceprotectionisitcanmakesurebothsidesmovementdancethetroublepicturebasicallytoprotect.Butisitisitwatchtoanalyzetorunfromsceneprotection,computercircuitprotectcommonlyuseddirectionhighfrequencyprotect,astohightohinderearthtroubleprotectsensitivitytobeenough.Generallyspeaking,atpresenthightohinderanalyticmethodthatgroundprotectionspendstoreinenough,thestandardizedcharacteristicvectorlimitstheutilizationratiototheinformationthatcanbeobtainedofthesystemgreatly,makeitstartandisitstoredifficultyintoselectnottoprotect,thusinfluencedtheperformanceoftheprotector.So,detectingandfindingthisfaultintimeisveryimportant.It’sverynecessarytodevelopanewhigh-performancescheme,whichinvolvesbothprincipleandhardware.Combinedwiththecharacterofthesuperpressurepowertransmissionlinefaulttransientcurrent,TheProtectforhighresistanceearthfaultofsuperpressurepowertransmissionlinewithoneterminaltransientcomponentbasedonwaveletpacketalgorithmisproposed.Thisschemeuseswaveletpacketalgorithmtodistilltransientcomponent.Fordifferentfaultkinds,afaultcanbeidentifiedasinternalorexternaloneaccordingtothenumberthattheratioofcorresponsivetwobandenergyexceedthanthresholdvalueincertaintime.Thisschemecanacttoanicetyinanybusbarcapacitanceandhighresistanceearthfaultsituation.Farthermore,itdoesn’tneedanycommunicationchannel,anditisimmunizedtosystemconfiguration.Thepaperjoinsanactualultrahighvoltagetransmissionlinesystem,throughATPtooutsidetheareain,theareaandreversebreaksdowndifferenttypetocarryonthesimulation,throughhasproventhisplanvalidityandtheaccuracytothesimulationexperimentobtaineddataanalysis.KEYWORDS:waveletpacketalgorithm,oneterminaltransientcomponent,highresistanceearthfault,differentofbusbarcapacitance200616___20061620061611.11.1.190%19986200112[1](MDT-F)21.1.2192030[2]——[3],()202019583[4]70()80[5,6][7][8]220KV[9]804[10,11]90GPSGPSGPS[12,13]GPS,,EHVT.W.Stringheld1957AIEE,70TakagiChamiaTakagi[14~16],;,,;[17],1RALDA:,,802RALDA,,2:[1],;[2]245,,,,,[17],FF0,;F=0,,5,,,N,N,,,[18],1S2S,,,21SS,21SS,,[19~20],,,:,2,,,,,:A(),(),B,,C,,[21],,,6,,,1.2,,20~40ms60L.N.Walker,[22][23],,,[24]T,,,,,,80,A.T.Johns[25]90,Johns[26,27],7(CVTcapacitorvoltagetransformer),,,,500kHz,,,Z.Q.Bo,,,,[28]EHV,MOV,;,[29][27],,(,,ABCVVV),(mod22ABCeVVV=−+mod3ACeVV=−),,,,,[30]:,,:,(TA)80kHz,;TA[31],,281kHz80kHz1fI2fI,1.5ms,opIreI,,[32,33][34][35,36][37],[38],,,,,2000pF15000pF[39][34-38]0.1Fµ6[34-38]1.39(ATP)ATP102.1,,(),:A,,[40]B,EHV,2,,EHV,,,,,,:EHV,MOV,()[40]:,,,,11[41]2-1xxdxdxxii∂∂+dxx+dxR0dxL0dxR0dxR0dxL0dxL0dxG0dxC0dxG0dxC0++xu−i−u2-1Fig2-1themodelofeventransmissionlinedistributedparametermoldedreliefmap00,RLΩ/mH/mC0G0F/mS/mxI(x,t)u(x,t)1200uiRiLxt∂∂−=+∂∂(2-1)00iuGuCxt∂∂−=+∂∂(2-2)uixt(0tt=)()xx0U1I11111dxcdxcUUchdxZIshdxUIshdxIchdxZγγγγ••••••=−=−+(2-3)0000()()RsLGsCγ=++,0000cRsLZGsC+=+,s[42]132-2(a)(b)Fig2-2(a)Systemmodelschematicdrawing(b)Breakdownattachmentconditionequivalentchart2-2EZ2Mud(t))sin()(0ϕω+=tEtumd)()(1tutud−=)(1tu20201)sincos(ωϕϕω++−=ssEUmi1(t)u1(t)(2-3)212212()()ccUsUchlZIshlUIsshlIchlZγγγγ••••••=+=+(2-4)U2=I2*Z2)()())(()sincos)((212022021221sfsfslchZlshZslchlshZZEUlchZlshZlchlshZZIccmcc=++++−=++=ωγγϕϕωγγγγγγ(2-5))(2sf[50]I(t)∑∞==1'211)()()(ktskkkesfsfti0ωjs±=14)(1ti∞rs=di1),,1(∞=±=Λkjrskkkω)(1tik(2-5))(2sf(2-5)2.22.2.1[43][44][45]15[46]2.2.2L2[a,b][a,b]ω(x)2()()baxfxdxω∞∫(2-6)ω(x)0(x(x,b))f,gL2[a,b],(,)()()()bafgxfxgxdxω=∫(2-7)1222()()bafxfxdxω=∫(2-8)L2[a,b]Vn⊂L2[a,b],12{,,}nnVspanϕϕϕ=L2[,]fLab∈1()()niiixcxϕϕ∗∗==∑(2-9)φVn22ffϕϕ∗−≤−(2-10)∗ϕ(x)f(x)[a,b]ω(x)),,2,1(njcjΛ=∗1(,)(,),1,2,,nijiijcfinϕϕϕ∗===∑L(2-11)160001()(cossin)()tNncnsnItIeIntIntetτωω−==+++∑(2-12)IncInsne(t)τteI−0tKIeIt100−=−τK1=IdtIIeIdt−=−00τ(7)k0001()(cossin)()kdncnsnIkIIkIntIntekωω==−+++∑(2-13)m)1,sin,,sin,cos,,(cos0000tmttmtωωωωϕΛΛ=1(,)(,),1,2,,nijiijcfinϕϕϕ∗===∑L(2-14)∗ick*2*2()()()kkmFkcc+=+,**()arctan()kmkkCCθ+=21()mFkc∗+=111212112121(,)(,)(,)(,)mmmmAϕϕϕϕϕϕϕϕ++++=LMOML(2-15)d12(,,,)dxxxL171(,)()()dijikjkkxxϕϕϕϕ==∑2(21)md+111212112121()()()()()()()()kkkmkkmkkmkmkxxxxTxxxxϕϕϕϕϕϕϕϕ++++=LMOML(2-16)1ddkkAT==∑Xd+1111111211121111211211()()()()()()()()dddmddmddmdmdxxxxTxxxxϕϕϕϕϕϕϕϕ+++++++++++++=LMOML(2-17)111dddAATT++=−+A(,)ifϕ~