高速列车四象限变流器非线性振荡现象-研究

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1、ABSTRACTABSTRACT：Hi曲一speedtrainissuppliedbyalternatingcurrent(AC)powerandbaseonsingle—phasefour-quadrant(4Q)converterasonenecessarypartofthe‘AC-DC(directcurrent)-AC’transformprocess．Thispaperconsidersdigitalcontrolsamplingdelayeffectsin4Qconvertercircuitanalysismodel．Focus

2、ingonthestabilitycharacteristicsofthesystem，itanalyzedthesystemstabilityofdifferentcircuitparametersandcontrolparameters．Italsoexplainedthenonlinearoscillationmechanismatdifferentfrequencyareasandharmonicsincreaseofthephenomenon．Thepaperpresentedamathematicalmodelforthesin

3、gle-phase4QconverterandusedHopfbifurcationtheoryofnonlinearsystems，smalldisturbancemethodandtheroot-locusmethodtostudythetypicaldrivesystemstability．Usingdescribingfunctionmethod，thePWMsaturationcharacteristichasbeenmodeledandanalyzed，andalimitcycleexistswhenthecurrentcont

4、rollerproportionalcoefficientisbeyondthebifurcationvalue．Italsoestablishedadiscrete-timemappingmodelforthedigitalcontrolledsystemtoobserveaperiod·doublingbifurcation，aborder—collisionbifurcation，andtheoscillationdevelopmentprocessfromacertainphasezonetotheentirecyclerange．

5、Accordingtotheequivalentimpedancecharacteristicsoftractionpowersupplysystem，thispaperhasbuiltastate-spaceaveragemodelofthetractionnetwork一4Qconvertercouplingsystem．UsingHopfbifurcationtheory,itpredictedabifurcationphenomenonandanewunstableboundary．Italsoderivedafrequencyca

6、lculationmethodwhena4Qconverterharmonicoscillationappearedinhi。曲speedtrains．Takingintoaccountthedifficultyinhandlinghighpowerconvertersforexperimentalanalysis，‘acomputersimulationhasbeenimplementedtodeliveravalidatedt001．However,asmallscaleprototypehasbeendevelopedtoconfir

7、mthesimulationresults．KEYWORDS：high—speedtrains；four-quadrantconverter；nonlinearbehavior；oscillation；Hopfbifurcation；stability．CLASSNO：TM461．5V目录致谢⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．iii中文摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．iiiABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一v

8、1绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1课题提出的背景及意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．2国内外研究现状⋯⋯⋯⋯⋯