资源描述：
《基于PSCADEMTDC的小电流单相接地故障模型仿真.doc》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、编号毕业设计（论文）题目基于PSCAD/EMTDC的小电流单相接地故障模型仿真二级学院电子信息与自动化学院专业电气工程及其自动化班级学生姓名学号24指导教师评阅教师时间摘要第一小段，应该介绍一下你论文的意义。然后下面再开始介绍你的工作建立了小电流接地系统的仿真模型，利用电磁暂态程序PSCAD/EMTDC全面仿真了不同故障情况对故障稳态和暂态电压、电流幅值特征和相位特征产生的影响,（这句话太拗口）并得到了相应的零序电压及零序电流的幅值、相位及波形。通过对仿真数据及波形的进一步分析，得出了小电流接地系统发生单相接地故障时的运行特点,验证了小电流接地故障稳态和暂态分析理论的科学性、合理性。为了提取配
2、电网单相接地故障选线和故障测距的暂态故障特征量,基于PSCAD/EMTDC的仿真环境,搭建了小电流接地系统的配电网络仿真模型并综合考虑不同短路时刻、不同接地电弧电阻、不同故障距离和线路长度等多个因素,对配电网小电流接地系统的单相接地故障进行了大量仿真。在配电网单相接地短路故障后的第1个工频周波(0~0.02s)内故障线路的零序电流包络线的变化速度比非故障线路变化缓慢,包络面积大,但与非故障线路首半波极性相反。仿真分析表明此暂态特性不受短路时刻、电弧电阻、故障距离和消弧线圈被偿度的影响,为单相接地故障选线和故障测距的研究提供了理论依据。关键词：小电流接地系统；单相接地故障；故障选线；PSCAD/
3、EMTDC仿真;选线原理;补偿度;故障相电压AbstractAsimulationmodelofnon-solidlygroundedsystemispresentedinthepaper.Overallsimulatingofamplitudeandphasecharacteristicsofsteady-stateandtransientfaultvoltageandcurrentondiversefaultconditionsisperformedbyusingElectromagneticTransientProgramPSCAD/EMTDC.Theamplitude,phaseand
4、waveformofthecorrespondingzerosequencevoltageandcurrentcanbeobtainedbythedesigningprogram.Byfurtheranalyzingthesimulationdateandwaveform,thebasicprinciplesandcharacteristicsoflow-currentgroundingpowersystemswerepresented,verifyingtheanalyticaltheoriesofthesteadyfaultandtransientfaultaboutsinglePhase
5、groundingscientificandreasonable.Thetransientcharacteristicofsingle-phasetogroundfaultisusedforthefaultlineselectionandfaultdistancedetectionindistributionnetwork.ThedistributionnetworksimulationmodelisestablishedfortheNeutralUneffectualGroundedSystem(NUGS),Variousfactors,suchasdifferentshortcircuit
6、time,arc-resistances,faultdistances,linelengthandthecompensationratesofarc-suppressioncoil,shouldbeputintooverallconsideration.Thesingle-phasetogroundfaultoftheNUGSissimulatedsoastoresearchthetransientcharacteristicsofsingle-phasetogroundfaultindistributionnetwork.Throughanalyzingthesetransientchara
7、cteristicssuchaszero-sequencecurrentandvoltage,fault-phasevoltageandcurrent,itisconcludedthatthesetransientcharacteristicschangewiththedifferentshortcircuittime,arc-resistances,faultdistancesandthecom
