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ID:37414177
大小:2.28 MB
页数:96页
时间:2019-05-23
《基于直接法的静态电压稳定临界点计算》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、ABSTRACTThecalculationofcriticalpoint,alsocalledmaximumpowerpon,isallimportanissueinthefieldofpowersystemstaticvoltagstabilityresearch.Withtheexactcriticalpointcalculated,theloadingmargintovoltagecollapsecallbedeterminedandthemarginsensitivityv矗t}lrespecttocontrolparamete
2、rCOalbeusedforpreventiveandcorrectivecontrolagainstvoltageinstability.Atthecriticalpoint,theJacobianmatrixofconventionalpowerflowequationsbecomessingular.Toovercomethisdifficulty,twomethodhavebeenappliedtocomputethiskindofpoints.Oneiscontinuationmethod,whichgetstheapproxi
3、matecriticalpointthrou曲tracingthePVcurve.Themaindisadvantageistime-consumingfeaturewhichmakeitunsuitableforonlineapplication.Theotherisdirectmethod.alsocalledNewtonmethod,whichgetstheexactpointbysolvingasetofnonlineardeterminationequations.Currently,thedirectmethodisnotwi
4、delyusedmainlybecausethatthedimensionofthedeterminationequationsistwiceaSthedimensionincontinuationmethod,whichneedsmoreCPUmemoryandtimetocompute.Inaddition,theestimationofinitialvalueisanotherdifficulty,divergencewillOccurwhentheinitialguessistoofarfromthesolution.Inthis
5、dissertation,anewmatrixreductiontechniqueispresentedtodirectlycalculatethecriticalpoint.ThefeatureofthisalgorithmisthattheoriginalNewtoniterativeequationswhichisof(2n+1)dimensionsCanbesolvedthrough(n+1)dimensionallinearequations.Comparedwitlltheoldermethod.thisapproachsig
6、nificantlyreducesthecomputationaleffortsandismoresuitableforonlineapplicationinbulkpowersystemsusingsparsetechnique.Inaddition,aneffectiveschemeisalsoproposedtoestimatetheinitialvalueofstatevariablesandrighteigenvectorofcriticalpoint,whichexploitthesecondderivativeofloadp
7、arameter.Toassessthevoltagestabilityunderbranchoutagecontingency,thisdissertationpresentsanewtechniqueforcriticalpointtracing.WithbranchadmittanceaSthecontinuationparameterthismethodcantracethroughthecriticalCOlWe,whichismadeupofcriticalpoints,frompre—contingencycasetopos
8、t·contingencycaseusingpredictorandcorrectonAllequationsinpredictionandcorrectionCanbesolvedusing
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