電力系統(tǒng)非線性動態(tài)特性分析

1、東北電力大學碩士學位論文電力系統(tǒng)非線性動態(tài)特性分析姓名：陳武暉申請學位級別：碩士專業(yè)：電力系統(tǒng)及其自動化指導教師：鄧集祥20070301Abstract11他interconnectedpowersystemsareinherentlywideareanonlinearsystemsAndthescaleofinterconnectednetworksisendlesslyenlarged，powersystemsareoperated

2、increasinglyclosetotheirlimitsandmanyvariousnewtypefastcontroldevicesarecontinuallyutilized111efactsmentionedaboveleadtotheincreaseofpowersystemnonlinearityandmakepowersystemsexhibitcomplexnonlinearmodalinteractionsButit

3、isunsuitablethatthepreviousmethodssuchasthelinearizationtheorythedirectmethodandthetimedomainsimulationareusedtoanalyzethecomplexdynamicbehaviorwhichiscausedbynonlinearmodalinteractionsAfIcrnormalformsofvectorfieldsandmo

4、dalseriesmethodsareintroducedintothefieldofanalysisofpowersystems，theybecometheimportanttoolstoanalyzenonlineardynamicperformanceofpowersystemsneformulaofsecondordersolutionsbasedonnormalformsofvectorfiel幽andmodalseriesh

5、avebeenalreadyobtained。SOwecancognize，understandandanalyzestabilityanddynamicperformanceofpowersystemsbysecondordernonlinearstructuralcharacteristicsNevertheless，itisinsufficienttoexplainallnonlineardynamicphenomenaofhig

6、hlystressedpowersystemsbysecond—ordernonlinearstructuralcharacteristicsTherefore，itisnecessarytostudynonlineardynamicperformanceofpowersystemsinthespaceofthird—ordersolutionsOnthebasisofsecondordersolutionsofnormalformso

7、fvectorfieldsandmodalseries，modalseriesthirdordersolutionsarederivedandnumericaldifferentialmethodisdevelopedtosolve也irdpartialderivativesnleeffectivenessofmodalseriesmirdordersolutionsisvalidatedontheanalysisofnonlinear

8、dynamicperformanceThird—ordercombinationmodesaretestedbyPronyanalysisTllird—ordersolutionsareappliedforanalyzingthemechanismoftheincreasingamplitudelowfrequencyoscillationanditisconcludedthatthehighnonlinearityisthemainc