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1、浙江大學(xué)電氣工程學(xué)院碩士學(xué)位論文城市電網(wǎng)安全預(yù)警與保障決策支持系統(tǒng)姓名：劉磊申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電力系統(tǒng)及其自動(dòng)化指導(dǎo)教師：江道灼;郭瑞鵬20080510浙江人學(xué)碩二f：學(xué)位論文AbstractDuringthepastyears，blackoutsinthepowersystemoccurredovertheworld．TheshortcomingsofEMSwereexposedtothedispatchingcentre，andallintelligentsecurityearlywarningsystemisrequired．Thesecurityear
2、lywarningsystemshouldobservethereal．timestateofpowersystem，carryouttheanalysisofpowersystemsecurityassessment，findthehiddenfaultandsendthesecurityearlywarningreporttothedispatcher,whowilldecidethemeasureoffaultdisposaltokeepthesecurityofpower鰣d．Inthispaper,thestructureofon-linesecurity
3、earlywarninganddecisionsupportsystem(EWDSS)forurbanpowergridarepresented．Intheurbanpower曲d，theproblemofanglestabilitycanbeignored，butthethermalstabilityproblemisobvious．So，theon．1inesecurityearlywarninganddecisionsupportsystemisdiscussedfromseveralprofessionalaspects．Urbanpowergridsgen
4、erallyusedlooppowernetworkdesigned，radialrunningmode．Whentherewerefaultsormaintenanceinurbanpowergrid，thepowerloadsweretransferredthroughclosingloopoperationtoavoidblackoutsofconsumersandimprovethereliabilityofpowersupply．Astheperformanceofthegridafterclosingloopwasopaquetothedispatche
5、randtojudgethefeasibilityofclosingloopWasdi衢cult，thelooppowerflowWassometimestoolarge，whichwouldcauselinesorequipmentsoverload，relayactionandblackoutsofconsumers．AfterChina’S220kVpowergriddivision，closingloopoperationbetweendifferentregionsofcentralpowersupplyhaspuzzledtheactualoperati
6、onoftheelectricityproduction，andthephenomenonofrelayactionduetolargelooppowerflowrepeatedlyappearedinmanycities．So，allon．1inelooppowerflowcalculationmethodisrequiredtocalculatethelooppowerflowinadvance，andthedispatchercouldbeinstructedtoholdthebesttimeofclosinglooptoensurethesafetyofeq
7、uipmentsandimprovethereliabilityofpowersupply．Closingloopoperationandcalculationoflooppowerflowarestudiedinthispaper．Basedonthestudy,thefunctionofon-linelooppowerflowcalculation(stateestimationonactivepower)oftheEWDSSaredesignedandrealized．Stateestimationonactivepowerisestablishedont
