电力系统共振机理低频振荡的研究

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1、华北电力大学硕士学位论文摘要低频振荡问题一直是影响电力系统安全稳定运行的重要问题。本文围绕电力系统共振机理低频振荡这一问题，重点研究了系统因素对振荡特性的影响、多机系统中的振荡情况以及共振机理低频振荡的产生原因等几方面的问题，完成的主要工作如下:1.根据电力系统低频振荡的共振机理，分析共振机理低频振荡的振荡特性，研究系统中各个影响因素对共振机理低频振荡特性的影响。2.理论推导了两机互联系统的共振机理，分析了两机互联系统固有频率与阻尼的关系。并以两区域四机系统和河北南网系统为例，使用PSS/E软件，研究共振机理低频振荡在多机系统中的振荡情况。3综合考虑汽轮机热力系统与电力

2、系统的相互影响，从汽轮机热力系统寻找电力系统发生共振机理低频振荡的扰动源，讨论了汽轮机蒸汽各初终参数变化对汽轮机输出机械功率的影响。4.建立了汽轮机压力功率模型，着重研究了汽轮机压力脉动与系统发生共振振荡的关系，仿真分析表明汽轮机压力脉动可能是电力系统发生共振机理低频振荡的产生原因。关键词:电力系统，低频振荡，共振机理，汽轮机，压力脉动华北电力大学硕士学位论文ABSTRACTLowfrequencyoscillationisanimportantproblemwhichalwaysaffectsthesecurityandstabilizationofpowersyst

3、em.Thisdissertationconcentratesontheresearchofpowersystemlowfrequencyoscillationsofresonancemechanism.Theefectsofsystem'sinfluentialfactorsonoscillations,resonanceoscillationsinmulti-machinepowersystemsandthereasonsofresonanceoscillationsarecomprehensivelystudiedinthispaper.Themaincontri

4、butionsofthisdissertationarelistedasfollowing:1.Inaccordancewiththeresonancemechanismoflowfrequencyoscillations,thecharactersofoscillationsandtheefectsofsystem'sinfluentialfactorsonoscillationsareanalyzedinthispaper.2.Lowfrequencyoscillationresonancemechanismoftwo-machinesystemwasestabli

5、shedinthispaper.Therelationsbetweennaturaloscillationfrequencyanddampingoftwo-machinesystemwereanalyzed.Four-machinetwo-areasystemandsouthernnetworkofHebeiprovinceweretakenastheresearchobject.Lowfrequencyoscillationofresonancemechanisminmulti-machinepowersystemsisanalyzedusingPSS/E.3.The

6、efectsofvariationsofsteamturbine'soriginalandfinalparametersonoutputmachinepowerwerediscussed.Theinteractionsbetweenturbine'sthermalsystemandpowersystemareconsidered.Thenthereasonoflowfrequencyoscillationofresonancemechanismisfoundfromthermalsystemofsteamturbine.4.Thepressure-powermodelo

7、fturbineisestablished.Therelationbetweenthevariationsofturbo-pressureandpowersystemresonanceoscillationhasbeendiscussed.Aconclusionfromthesimulationisdrawnthatthevariationsofturbo-pressuremightcausepowersystemlowfrequencyoscillationofresonancemechanism.HanZhiyong(electric