電力系統(tǒng)非線性動(dòng)態(tài)特性分析.pdf

1、東北電力大學(xué)碩士學(xué)位論文電力系統(tǒng)非線性動(dòng)態(tài)特性分析姓名：陳武暉申請(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：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