馈线无功补偿电容器故障原因及治理措施研究

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1、论文题目：馈线无功补偿电容器故障原因及治理措施研究专业：电力系统及其自动化硕士生：李宛怡(签名)指导教师：董张卓(签名)摘要电力系统无功补偿的原则是区域无功平衡，并联电容器是常用的无功补偿设备，配电公网馈线上装设的并联电容器组时常损坏，电容器损坏后，加大了馈线的线损，且影响配电网向用户供电的可靠性和电能质量的优质性。分析馈线无功补偿电容器产生故障的原因，并提出治理措施具有重要理论意义和实用价值。论文中，首先总结了馈线无功补偿电容器的故障类型和故障特点，然后结合国内外电容器故障机理的研究现状，对现有避免电容器损坏技术手段进行分析和总结；结合我国电力系统中电容器的故障特点，分析产生故障

2、的原因。论文中，提出了在馈线上装设采用瞬时功率理论的三相并联电压抑制器对馈线过电压进行抑制的思想，并对过电压抑制器的电路拓扑和关键部分进行了设计。在MATLAB/simulink环境中构造了采用瞬时功率恒定的控制策略的三相三线制有源电力过电压抑制器，并搭建了实际10kV馈线模型，模拟谐振过电压故障。在10kV馈线模型上装设有源并联电压抑制器，验证论文中所提出的抑制措施的有效性和正确性。关键词：无功补偿电容器；过电压抑制器；瞬时功率理论；过电压；研究类型：应用研究万方数据Subject：ResearchofReasonsandGovernanceMeasuresofReactiveP

3、owerCompensationCapacitorFaultonFeederSpecialty：PowerSystemanditsAutomationName：LiWanyi（Signature）Instructor：DongZhangzhuo（Signature）ABSTRACTTheprincipleofreactivepowercompensationislocalpartitionbalancing.Shuntcapacitoriscommonlyusedforsuchpurpose.However,damageoftenoccursinshuntcapacitorbank

4、sinstalledonthepublicnetworkdistributionfeeders,whichcauseseconomylossandseriouslydegradesthereliabilityandqualityofthepowerdistributionnetwork.Thestudyonthecausesofsuchfailurehasgreatvalueforbothfundamentalscienceandpracticalapplications.Thisthesisisorganizedasfollows.First,thetypesandcharact

5、eristicsofthefaultinfeederreactivepowercompensationcapacitorsaresummarized.Second,theexistingtechniquesofpowercompensationcapacitorsareanalyzedandsummarized.Third,basedonthecharacteristicsofthefaultsthathaveoccurredintheelectricpowersystemcapacitorsinChina,thecausesofthefailuresarediscussed.Fo

6、urth,atechniquethatadoptsthree-phaseshuntvoltagesuppressoronthefeedertolimitthefeederovervoltage,whichisbasedoninstantaneouspowertheory,isproposed.Last,athree-phasethree-wireactivepowerovervoltagesuppressorusingconstantinstantaneouspowercontrolstrategyisconstructedinMATLAB/simulinkenvironment,

7、andapractical10kVthree-phasefeedermodelisbuilttosimulatetheresonanceover-voltagefault.ActivePowerShuntVoltageSuppressorsareinstalledon10kVthree-phasefeedermodel,whichisusedtoverifythecorrectnessofsuppressionmeasuresproposedinthisthesis.