高压直流输电线路暂态电流保护与测距分析

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1、上海交通大学硕士学位论文摘要方案综合考虑了多种因素的影响和作用，如：长距离高压直流输电线路对地分布电容影响。以故障点为参考基准，建立线路的电压电流平衡矩阵方程，采用双端电压、电流递推法计算故障距离。该方法可以消除过渡电阻的影响，测距精度高。最后，总结了全文的主要研究内容和研究方法，通过实验验证了研究结果的正确性，对进一步深入研究有一定参考价值。关键词：高压直流输电，双端暂态电气量，位移偏差量，变化乘积量，故障测距，分布参数模型国家自然科学基金资助项目（51177066）II万方数据上海交通大学硕士学位论文ABSTRACTStudiesonTransmissionLineTrans

2、ientCurrentProtectionandFaultLocationinHVDCSystemABSTRACTInconsiderationofthegrowthofnationaleconomy,theincreasingdemandforelectricity,thenaturalconditionsaswellasthedistributionofenergyinChina,ithasbecomeaninevitabletrendoflong-distanceandlarge-capacitypowertransmission.Inordertoreducethepow

3、erlossintransmissionlinesandsavethelandresource,HVDCtransmissionsystemisneeded.TheprotectionofHVDCtransmissionlineisveryimportantforthesystemsafeandstableoperation.Therefore,itisessentialtodofurtherresearchandimprovement.ThesummaryofHVDCsystempowersimulation,transmissionlineprotectionschemean

4、dfaultlocationispresentedinthispaper.(1)Uni-polar12pulseHVDClinewithgroundreturnmodelisestablishedbasedonCIGREDCtransmissionstandardandPSCAD/EMTDCsoftware.Sometypicalfaultconditionshavebeensimulatedandanalyzed.Accordingtothat,theoperationcontrolmannerandrelayprotectionsystemareresearched.(2)A

5、newpilotprotectionbasedonpolaritycomparisonisproposedthroughIII万方数据上海交通大学硕士学位论文ABSTRACTamplitudeanddirectiondifferencecomparisonoftransientcurrentatbothends.Utilizingthedissimilarityoftransientcurrentwaveformsattwoends,displacementdeviationandproducttermofcurrentchangesareintroduced.Thereby,t

6、herelevantcriterionisproposedtodistinguishtheinternalandexternalfaultseffectively.Simulationresultsshowthattheproposedschemehashighreliability.(3)NewfaultlocationmethodinHVDCtransmissionlineisproposed.Themethodusesthevoltageandcurrentatbothterminalsofthetransmissionlinestocalculatethefaultdis

7、tancebymeansofsolvingbalancedmatrixequation.Simulationresultshowsthatthemethodhasgoodprecision.Finally,summarizedthewhole-lengthmainresearchcontentandthemethodofresearch,throughtheresultsverifythecorrectnessoftheresultsofthestudy,thefurtherst