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ID:15783919
大小:3.75 MB
页数:102页
时间:2018-08-05
《基于单周期控制的三相三开关三电平boost型pwm整流器的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、华南理工大学硕士学位论文基于单周期控制的三相三开关三电平Boost型PWM整流器的研究姓名:武志贤申请学位级别:硕士专业:电力电子与电力传动指导教师:蔡丽娟20050501华南理工大学硕士学位论文由实验结果可以看出,VIENNA整流器是一种性能良好的拓扑,具有很多优点,尤其是在开关管的选择过程中可以很方便的选择所需的开关管,是一种值得推广的新颖拓扑。关键词:功率因数校正,三开关,三电平,单周期控制,统一恒频积分控制器IIABSTRACTABSTRACTWiththedevelopmentofscienceandtechnology,thepo
2、llutiontotheEarthisbecomingworseandworse.Asakindofenvironmentthepowersystemisfacedwithpollution.harmonicsandreactivepowerisoneofthebiggestpollutionofpowersystempollution.Duetotheincreasingdemandforimprovedpowerquality,harmonicsandreactivepowerproblemhavegainedconsiderableat
3、tention.Forconventionalrectifieroftenconnectuncontrolleddioderectifierwithcapacitorfilter,whichmakesinputcurrentdistortedseverely.Highorderharmonicsseverelyinterferedevicesinthepowerlineanditself.Three—phaseactivepowerfactorcorrection(PFC)isanactivemodetoeliminateharmonics,
4、whichoftenusedinmediumandhigherpowerlevels.Thetopologythree-phase/switch/levelBoost—type(VIENNA)rectifierisanovelstructureandisselcotedtobestudiedinthedissercatiOn.Itshowsespeciallythefollowingadvantagesascomparedtoconventionalthree·-phasetwo--levelconvertersystems:lowerblo
5、ckingvoltagestressonthepowertransistor,lowerharmonicsofthemaincurrent,highpowerfactorandhighreliabilitybeinginherenttothesystem.Themainachievementsareasf01lows:1.Summarizethedevelopmentofthree—phasepowerfactorcorrectionandchooseVIENNArectifierastheresearchobject.2.Introduce
6、theoperatingprincipleofVIENNArectifier.Onthebaseoftheoperatingprincipleseveralcontrolmethodsaregiven.Aftercompareone—cyclecontr01methodischosentorealizethecontr01aim.3.UnifiedConstant—FrequencyIntegration(UCI)controllerbasedonone·cyclecontrolconceptofVIENNArectifierisintrod
7、uced.4.Toverifytheconceptasimulationcircuitwasbuilt.5.Anexperimentalcircuitwasbuiltandverifiedtheconceptproposedisright.Keywords:Powerfactorcorrection(PFC),Three—Switch,Three-LeveOne—cyclecontroI,UnifiedConstant-FrequencyIntegration111第一章绪论第一章绪论帚一早珀T匕1.1课题的理论和实际意义随着工业现代化进程的
8、不断加快,对地球环境的污染和破坏不断加剧。电力系统作为一种环境也面临着污染,公共电网中的谐波和无功问题是其中最大的一种污染,因此谐波和无功问题也日益受到重视。为了减
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