基于TCP-IP的牵引供电SCADA系统通信网络性能及QOS仿真研究

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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