简介：TopicsofcurrentinterestInthelastissueofthisjournal“ELECTRICITY,CSEE”areportwaspresentedontheInternationalConferenceonPowerSystemTech-nology’91wherespecialistsfrom15countriesweregatheredtogethertodiscusstopicsofcommoninterest.Severaloutstandingproblemsdeservespecialreport.Forinstance,thegreenhouseproblemwasreportedinthisissueunderthecolumnofpowerandenvironment.Theoperator’strainingsimulatorisreportedinaspecialarticleinthisissue.Sinceaseriesoflargescaleblackoutsoccurredinseveralcountries,particularlythe1977NewYorkCityblackout,peoplerealizedthatoperatorsinthemodemfullycomputerizedandautomatedcontrolcenterneedconstantpracticeonasimulator,sothattheycanbefullypreparedtohandlesuddenattacksofseveredisturbances.Thecurrentprob-lemsandviewsfromseveralcountriestakingpartinthepaneldiscussionwerereportedinthisissue.Somenewtechniquesattractingmuchattentionfromresearchersinthefieldofpowersystemtechnology,suchasfuzzysystems,ExpertSystems,ArtificialNeuralNetworksandPetriNetswerediscussedtoquitesomeextentinthisconference.Theyarealsoreportedinthisissue.Morespecialsubjectswillbereportedinlaterissues.(Ed.)

简介：Theboilerisoneofthekeypartsofpowerstation.Monitoringtheoperationoftheboilerautomatically,continuouslyandaccuratelyisveryimportant.Incaseofmalfunctions,anexpertsystemmightbehelpfultofindthesourcesoffaults,andthereafterwillassisttheoperatortoactcorrectlyandtopreventthefaultfromfurtherdevelopment.Inthispaper,asimulationstudyofanexpertsystem,whichcandiagnosetherunningfaultsofboilersystem,isconducted.Shallowanddeeptwo-layerknowledgebasestructureisusedinthistwolayersofknowledgebase.So.thiskindofexpertsystemcanovercomethedisadvantagesoftheoldtypesofexpertsystems,whichareonlyabletodealwithexperiencerulesbase.Asimulatorofpowerboilerisusedfortheresearchonfaultdiagnoseexpertsystem.Thisboilersimulatorgivesallnecessaryinformationforthediagnosis.Theknowledgebaseofexpertsystemisbuiltinhierarchies,sothespeedofreasoningmaybeinvreased.Afterthereasoningthesys

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