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AppendixA1:ASystemsViewoftheModernGridSELF-HEALSConductedbytheNationalEnergyTechnologyLaboratoryfortheU.S.DepartmentofEnergyOfficeofElectricityDeliveryandEnergyReliabilityMarch2007OfficeofElectricityDeliveryandEnergyReliabilityPageA1-1ModernGridSystemsView:AppendixA1v2.0Self-HealsTABLEOFCONTENTSTableofContents...........................................................................1ExecutiveSummary........................................................................2CurrentandFutureStates..............................................................6CurrentState..................................................................................6Transmission..................................................................................6Distribution.....................................................................................6FutureState....................................................................................7Requirements................................................................................9KeySuccessFactors......................................................................9Reliable...........................................................................................9Secure.............................................................................................9Economic......................................................................................10EfficientandEnvironmentallyFriendly.......................................10Safe...............................................................................................10ObservedGaps.............................................................................10DesignConcept............................................................................11DesignFeaturesandFunctions..................................................12ProbabilisticRiskAssessment.....................................................12PowerStabilizationTechniques..................................................12DistributionSystemSelf-healingProcesses...............................12UserInterface...............................................................................13FunctionalArchitectureStandardization....................................13PerformanceRequirements........................................................14Barriers......................................................................................16Benefits.....................................................................................18Recommendations.....................................................................19Summary....................................................................................20Bibliography...............................................................................22PageA1-2ModernGridSystemsView:AppendixA1v2.0Self-HealsEXECUTIVESUMMARYThesystemsviewofthemoderngridfeaturessevenprincipalcharacteristics.Oneofthosecharacteristicsis‘Selfheals’.Whatthatmeansandhowwemightattainthatcharacteristicisthesubjectofthispaper.Figure1:TheModernGridSystemsViewprovidesan“ecosystem”perspectivethatconsidersallaspectsandallstakeholders.Inthecontextofthemoderngrid,“self-healing”referstoanengineeringdesignthatenablestheproblematicelementsofasystemtobeisolatedand,ideally,restoredtonormaloperationwithlittleornohumanintervention.Theseself-healingactionswillresultinminimalornointerruptionofservicetoconsumers.Itis,inessence,themoderngrid’simmunesystem.Themodern,self-healinggridwillperformcontinuous,onlineself-assessmentstopredictpotentialproblems,detectexistingoremergingproblems,andinitiateimmediatecorrectiveresponses.Theself-healingconceptisanaturalextensionofpowersystemprotectiverelaying,whichformsthecoreofthistechnology.Aself-healinggridwillfrequentlyutilizeanetworkeddesignlinkingmultipleenergysources.Advancedsensorsonnetworkedequipmentwillidentifyamalfunctionandcommunicatetonearbydeviceswhenafaultorotherproblemoccurs.Sensorswillalsodetectpatternsthatareprecursorstofaults,providingtheabilitytomitigateconditionsbeforetheeventactuallyoccurs.Theself-healingobjectiveistolimiteventimpacttothesmallestareapossible.Thisapproachcanalsomitigatepowerqualityissues;sensorscanidentifyproblematicconditionsandcorrectivestepscanPageA1-3ModernGridSystemsView:AppendixA1v2.0Self-Healsbetaken,suchasinstantlytransferringacustomertoa“clean”powerqualityorsource.Asimplifiedexampleoftheself-healingconcept,illustratedinFigure2below,showstwopowerlineshavingmany“intelligentswitches”(notedas“R”)locatedalongthecircuit.Thisdiagramillustratestheintelligentswitchingfeatureofself-healing,whichcanmaintainpowertoamaximumnumberofcustomersbyinstantaneouslytransferringthemtoanalternateenergysource.Alternateenergysourcesmayincludecircuittiestootherfeedersortodistributedenergyresources(DER)suchasenergystoragedevicesandsmallelectricalgenerators(poweredbybothrenewableandnon-renewablefuels).Demandresponse(DR)canalsobeatoolinmatchingloadtogenerationintheself-healingprocess.Figure2:Automa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