A two-step supervisory fault diagnosis framework (1).pdf

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1、ComputersandChemicalEngineering28(2004)21312140Atwo-stepsupervisoryfaultdiagnosisframeworkYvonnePower,ParisaA.Bahri∗SchoolofEngineeringScienceandA.J.ParkerCooperativeCentreforHydrometallurgy,MurdochUniversity(RockinghamCampus),Murdoch,WA6150,AustraliaReceived5December2002;receivedinrevise

2、dform21December2003;accepted20January2004Availableonline4June2004AbstractTechniquesenablingearlydetectionanddiagnosisoffaultsareimportantintheprocessingindustries.Thispaperemphasisesatechniqueforearlyfaultdetectionanddiagnosisbasedondynamicfaultdataandatwo-stepfaultdetectionanddiagnosisfr

3、amework.Theapproachshowsvariousadvantagesoveralternativemethodsincludingpromptfaultdetectionandlocalisation,applicabilitytolarge-scalesystemswithouttheneedforexcessivecomputingresources,andamodulararchitecturethatallowsplantsectionstobetreatedindividually.Intheproposedmethod,thelarge-scal

4、eplantisbrokenupintosectionsandaPetrinetbasedonrealtimedataisusedtolocatetheparticularsectionoftheplantinwhichthefaultoriginates.ThisPetrinetthenactivatessecondaryneuralnetworks,whichdiagnosetheexactlocationofthefaultinthatparticularplantsection.Applicabilityoftheproposedtechniqueisdemons

5、tratedthroughapilotplantcasestudy.©2004ElsevierLtd.Allrightsreserved.Keywords:Faultdetectionanddiagnosis;Petrinets;Neuralnetworks1.IntroductiondiagnosistrainedondynamicfaultdataandtheuseofaPetrinetforfaultdetectioninlarge-scalesystems.FaultdetectionanddiagnosisisanessentialpartoftheInthep

6、ast,Petrinetshavecommonlybeenusedtomodeloperationofanyprocessingplant.Earlydetectionanddiag-discreteeventsystemssuchasbatchprocesses,wherethenosisoffaultsisimportantinprocessingindustrysincealotmaterialisoperatedinfinitequantities(orbatches),ratherofdamageandlosscanresultbeforeafaultpresen

7、tinthethanforfaultdetectionbasedoncontinuoustimedata.How-systemisdetected.Inaddition,itbecomeshardertodistin-ever,evenwithacontinuousprocess,dataiscollectedfromguishtherootcauseofthefaultoncethefaultpropagatesthedistributedcontrolsystem(DCS)atdiscretetimein-throught