城市电网安全预警与保障决策支持系统

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1、浙江大学电气工程学院硕士学位论文城市电网安全预警与保障决策支持系统姓名：刘磊申请学位级别：硕士专业：电力系统及其自动化指导教师：江道灼;郭瑞鹏20080510浙江人学硕二f：学位论文AbstractDuringthepastyears，blackoutsinthepowersystemoccurredovertheworld．TheshortcomingsofEMSwereexposedtothedispatchingcentre，andallintelligentsecurityearlywarningsystemisrequired．Thesecurityear

2、lywarningsystemshouldobservethereal．timestateofpowersystem，carryouttheanalysisofpowersystemsecurityassessment，findthehiddenfaultandsendthesecurityearlywarningreporttothedispatcher,whowilldecidethemeasureoffaultdisposaltokeepthesecurityofpower鲥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