变压器励磁涌流识别及抑制的仿真研究.doc

广西大学毕业设计论文摘要变压器励磁涌流识别及抑制的仿真研究摘要本文对变压器励磁涌流问题进行了深入的研究，从最基本的变压器磁路和电路结构出发，详细阐述变压器励磁涌流产生的基本原理，它的存在对常用的变压器保护性能的影响，以及如何在变压器保护中减弱和消除它的影响。文章在综述了励磁涌流的产生机理后，分析了励磁涌流的产生过程和波形特点，探讨利用电流作判据和现代数字信号处理技术与智能理论作涌流分析等识别励磁涌流进行了比较，并指出各种方法的优缺点。并对一些新的判别技术进行简单介绍和展望。此外，本文还介绍了目前使用得较为广泛、有效的几种抑制变压器励磁涌流的方法，并详细介绍了其中的选相投切技术的基本原理，分析了变压器空载投切的暂态过程，同时分析了快速合闸策略、延迟合闸策略、同步合闸策略以及相控投切策略这四种控制策略。最后在仿真软件中搭建变压器模型，对单相变压器励磁涌流和三相变压器励磁涌流进行了PSCAD和MatLab仿真，同时还对带合闸电阻的单相变压器励磁涌流和中性点串电阻的三相变压器励磁涌流进行了对比仿真试验。通过对比分析，证明这两种方法的正确性和可行性。关键词：励磁涌流选相投切技术PSCADMatLab仿真广西大学毕业设计论文AbstractResearchforIdentificationandInhibitionofTransformerInrushCurrentViaSimulationABSTRACTInthispaper,issuesoftransformerinrushcurrentisstudiedinsomedepth,Theresearchwillbebeginfromtheanalyzingbasicstructureofthemagneticcircuitandcircuitstructureoftransformer,andthemoredetailedprincipleofinrushcurrentgeneratedisstated,Further,thenegativeaffectionondifferentialprotectionoftransformerbyinrushcurrent,andhowtoweakenandeveneliminateitsimpactisalsodescribedinthepaper.Thispaperreviewstheinrushcurrentaftertheformationmechanism,analysisofinrushcurrentandwaveformcharacteristicsoftheproductionprocess,Exploretheuseofcurrentasthecriterionforidentificationinrushcurrentandtheuseofmoderndigitalsignalprocessingtechnologyandintelligenttheoryoftheinrushcurrentsurgeofidentificationmethodsareanalyzedandcomparedwiththeadvantagesanddisadvantagesofeachmethod,andanumberofThenewidentificationtechnologybriefandoutlook.Inaddition,thisarticlealsodescribesthecurrentusewasmoreextensiveandeffectiveinhibitionoftransformerinrushcurrentofseveralmethodsandgavedetailsoftheelectioninwhichcontrolledswitchingtechnologythebasicprinciple,analysisoftransformerno-loadswitchingtransientprocess,whilediscussedrapidclosingstrategydiscussed,delayedclosingstrategy,simultaneousclosingstrategy,andswitchingcontrolstrategywiththefourcontrolstrategies.Lastbuildtransformermodel,single-phasetransformerinrushcurrentandthree-phasetransformerinrushcurrentsimulationwithPSCAD,whilealsoclosingresistorwith