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ID:36619492
大小:2.43 MB
页数:72页
时间:2019-05-13
《基于TCP-IP的牵引供电SCADA系统通信网络性能及QOS仿真研究》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、西南交通大学硕士学位论文基于TCP/IP的牵引供电SCADA系统通信网络性能及QoS仿真研究姓名:张然申请学位级别:硕士专业:电力系统及其自动化指导教师:陈奇志20070501西南交通大学硕士研究生学位论文第1I页AbstractWiththerapiddevelopmentofnetworkcommunicationtechnology,thecommunicationnetworkforTractionPowerSCADAsystemhasdevelopedfromthetraditionallowspeedandanal
2、ogcommunicationsystemtothedigitalsystem,especiallyphasesinthehighspeedandbroadband.TheNetworkbasedonTCP/IPprotocolhasgotextensiveappliedinTractionPowerSCADAsystem.Studyingandanalyzingthecapabilityandthequalityofservice(QoS)inthiscommunicationnetworkhasbeenahotspotin
3、thisdomain.Firstly,thepaperintroducesthedefinitionofQoSandthecontrolmechanisms.Secondly,itanalysestheendtoendcontrolmodelandcontrolprotocolsofQoS,includingtheInterServmodelandDiffServmodel.ThepaperstudiesthecongestioncontrolalgorithmbasedonTCP/IPprotocol,anddiscusse
4、showtocombinethetwocongestioncontrolmechanisms.Subsequently,thepaperadoptsthesimulationtool(NS2),whichiswidelyusedinnowadaynetworksimulation.ThepaperalsolucubratestheinfluencefactorofthecommunicationnetworkbasedonTCP/IPprotocolforSCADA,suchasnetworkscale,transmissio
5、nbandwidth,datasendingperiod,queuebufferandSOon,whichaffecttheSCADAnetworkcapabilityparameterssuchasdelay,thepercentageoflostpackagesandSOon,usingNS2tosimulateandtesttherelevantcapabilityparameters.Howtoguaranteethenetwork’SOoSintheconditionofincreasingnetworkloadis
6、discussedinthepaper.Itcan’tbelimitedbyincreasingthesizeofbuffer,whichwillincreasethenetworkdelay.AfterstudyingtheRED(RandomEarlyDetection)algorithm,theREDalgorithmisappliedintheSCADAcommunicationnetwork.ComparedwiththeDroptailalgorithminthelow—gradenetworkcongestion
7、,thecapabilityparametersareevidentlystraightenupbyusingtheREDalgorithm.AfterstudyingtheDiffServmodel,thistechnologyis西南交通大学硕士研究生学位论文第1lI页appliedintheSCADAnetwork.Byconstructingthedifferentiatedservicelink,thenetworkcapabilityparametersgetbetterthanbefore,thenetwork’
8、sOoSisguaranteed.ThemethodofcombiningtheTCPcongestioncontrolandIPcongestioncontrolisappliedinthispaper。UsingtheDiffServtechnology,theQoSsy
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