《(完整word版)基于MATLABSimulink的电力系统仿真实验.docx》由会员分享，可在线阅读，更多相关《(完整word版)基于MATLABSimulink的电力系统仿真实验.docx（19页珍藏版）》请在课桌文档上搜索。
1、基于MATLAB/Simulink的电力系统故障分析IOkv系统三相短路分析三相短路（以中性点不接地系统模型为类）模块搭建：三相短路各元件参数设置如下:gBlOCkParameters:TheePhaseSoUrCeThree-PhaseSOllrCe(nasklink；7hrGG-phasVOItaZGSoUrCGinSGrieKWithRLbxanch.ParntsPhasetO-PhaSGsvoltaG(V):110.5e3PhaseanrlGfchaseA(degreGs):lFrtQutncy(HX):同InternalConn,action:YSPeCifriaped&nceUSX
2、nSSh-XtvCirCUitIeVeISoUreeresistance(Oh=Si:IO.009SoUrCeinductance(H):-116.58e-5-AITlrOKCancelHelpIIIBlOCkParameters;LinelIS-Three-PhasePZSeCtiOnLin已口a5%(Iink)ThiBblockinpleaentsathrt-phi.iPIsectionlintoXePreStitathiGG-phasGtransaisionline.ThigblockiGDresentsOnlyOnGPlsection.TOInplenente2orethatOnePI
3、SeCtiPnJyousiDlrneedtoCanneCtCOPieaQfthisblockinsexiesParaaQtQTSFreQUenCyUeeclforRLCspecification(Hz):F*PoIitiVe-Indzo-seauceresiBtances(0haska)K：RO:I0.012730.3SG4：Positive*andZeroeSGauencOinductances1)LILO:IT0.9327e-34.1264e-3PCSitiV-and4ro-ssau4neeca-pacitanees(FJka；IeICOI:I12.74e-97.751e-9LineSee
4、tiOnIGnSth(ka:.1130OKCanCeIKeIPApplyBlockParameters;Load4Tixice-PfcaseSeesRLCLoadaask(Iixlk)ZsDl3ntariecRLClead.Pajastt10e3Soainalfeuencyfn(Hz):lsActivtDorP(I):5ZnductlvereactivePOgrQL(positivecar):I5CaoaeitivereactivepwerQe(nerativa*):I5MeasuresentsIXone0BlockParameters:V-IThxee-PhaseVyeasureaent(B
5、a(link)Thisblockisusedtoseasurethree-phasevoltagesandcurrentsinacircuit.Whenconnectedinseriesithathree-phaseeIeaentfitreturnthethreepha-tofroundvoltagesandlincurrentB.Thtblke&noutputthtvoltteesandeury4nt8in.perunitvaluesyinolttAndamperes.Checkthe&pDropxiatebozesifyouranttooutputthevoltagesandcurrent
6、sin.DUPaaaet4r5Vltaceaeasure3ntphastophase7UceilabelSignal(usaFzqstolocktocollctthisinaL)S.VbcVoltaceinPUCuxrnt3tasuultlfult B Ih*ec-7hasc F nlVl au2V C IhtraA 7 FArJItIZFAalt ANPIeIEd MeaSULoiaLftlRLocaltaesareencIOSedinbrackets.,andSeODedtagna=esareSneIOSedinbraees；J).OKCanCaIIEelD)WFUnCtiOnBIOCkP
7、araneters;AddlCu,AcldcrsubtractXnPUtS-SCIfTCneOithefol.ovng:a) stringCOntainingor-foreachInPLtport,forSPaCerIeITefllPortS(e.c.一Db) SCalar)Avalue1SUalallinputs:1SUnlltstsOfatingleInPLtvctorMainISifnftIdatatypaICOnshae:re:l&ngulaxLIStOfKXeni:I*.SaSDlet-n*1forIEherXted):l,XICancelIHeIDIAppb一EroLJ.RckWi
8、ththespecifiedtar-Ifthttaeisdfi4dseoped,intheGotcMceltthenaGOtO7arVigibilitybloekustbeUSGCltodefinetheVigibilityOfthetag.After,UpdateDiaeraIDj：theblockicondisplaystheSeIeCtedtagnaze(IOCaItagsareenclosedinbrackets,andSCQPedtagnazesaxeenclose!inbraces：)OKCancelIHelp.1FUnCtiOnBlOCkParameters:DiSCrete3P
9、haScSeqUeflCeAnalyZcr2_K_一Diet3-PhESneAnly(linkThisdiscreteblockoutputsthpoitiv-1nfativ-.zro-orallBuaccoaponent(s)(3(anitudandPhase)ofastofthreebalanced.orunbalancedienfi.licaaycontainharaonics.ThethreeseQuenceCOSDanent3areCoaputedasfolllows:Vi=1/3*(Va*Vb2*Vc)V2-1/3(V-2aVc)VO=1/3TI*Vb，VC)rhrt;Va.-Vb
10、,Vc=inputphasersatfrqucyazxp(J*2pi3)=1*120dg.coaplxcpratorThtinputcontainsthtvctorixdiEalofthtthreeVaVbV,ciinutoida.1sicn&lsOutputoneandtwogiverespectivlytheaastudepeakvalu*)andphasedecprecs.cthespecxcdUeQUUtloeoosponcn(e).ForthefitcycleofSisulation,theouputsareheldconstanttthevaluesspecifiedbythepa
11、rameter*nitialinput*.Faa=etejs三相短路仿真波形如下:如图1a、b、c三相短路电流仿真波形图分析：正常运行时，a、b、c三相大小相等，相位相差120度。发生三相短路时，a、b、C三相电压全如图2一一线路1的零序电流分析：在没有故障时，没有零序电流，突然出现故障时，零序电流为故障电流的3倍，为31如图3线路1的零序电分析：在没普故障时，没有零序电压，突然出现故障律电需为故障电压的3倍，为如图4一一线路1的故障相电如图5线路3的零序电流如图6一一线路3的短路电流如图7一一三相对称电源电压如图8一一线路2的零序电流分析：在没有故障时，没有零序电流，突然出现故障时，零序电流
12、为故障电流的3倍，为310。如图9一一三相对称电源电流如图10一一三相对称电源零序电压如图11一相短路电流IOkV系统两相短路分析仿真模块搭建同三相短路，只有三相故障模块参数改变如下：注：a、b两相短路mtr:THr-PfyFltlJznrQa-Riia,ZGFUcgtn;Udcu飞ol2sx)prexaaruXcto-crcut)o-ooccroundYOMeandefinetHfaultniandalocboxoxapolanexternal.Ia1.KxrnolOonatx。！t。工，tHeaxnalcontrol7OprasaaFauixPtiasaDFaultPtId3。CFaulX
13、Fau11.isncAOOOtMeaauxeaene陵KTrGxundFaulatGreundre3xsatanocKcSnutr&CapacStancCq(Farad)IinfI-BztrnalcontrolofFau11tiaincTransition1atusC1O1ICioi)SnubterresxstanceRp(OrUD=IrriOJOfffifcxttrm分析：两相短路原理同三相短路，两相短路复合序网图是无零序并联网，短路两相电压相等，电流互为相反数，非故障相电流为零。零点漂移轨迹的验证一理论分析对于以下简单的中性点不接地系统，当其发生单相接地故障时，各量之间满足以下关系：其中，
14、分别表示A、B、C三相对0,点的导纳用复数形式可表示为UN=其相量关系如下图:可得所以，可以推出中性点不接地系统发生单相接地故障后，不同接地电阻下，对应的零点漂移轨迹为接地相右半圆.二matalab仿真模型搭建类似单相短路rTlAlLPhat-Souxcvjak)duc:tMu(H)Il.6BaumVoltrtiieo(V*JnaPlLPh).25e3QICCancelH1pApplv电源参数设置Branchtype:RLResistance(Ohms)30Inductance(H):0.8697Settheinitialinductorcurrent消弧线圈参数设置其它参数设置类似单相接地短路短路，但是接下来不知该怎么把它的参数通过图形描述出来，以此证明中性点不接地系统发生单相接地故障后，不同接地电阻下，对应的零点漂移轨迹为接地相右半圆.如下图:UcoUso
