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1、第41卷第15期電力系統(tǒng)保護與控制v0l_41NO.152013年8月1日PowerSystemProtectionandControlAug.1,2013基于故障特征頻率的單端行波測距新方法梁睿,靳征37劉建華(1.輸配電裝備及系統(tǒng)安全與新技術(shù)國家重點實驗室(重慶大學),重慶400044;2.中國礦業(yè)大學信g-5電氣工程學院,江蘇徐州221008;3.山東電力集團公司東營供電公司,山東東營257000)摘要:當電網(wǎng)某線路發(fā)生故障時,其暫態(tài)信號分別向故障點兩側(cè)傳播,測量到的頻率與故障點到觀測點的距離有確定的數(shù)學關(guān)系。基于特征頻率的暫態(tài)信號分析方法不需要提取行波波頭到達時刻,避免了行波
2、時域分析時由于波形畸變造成的測距誤差。在研究前人的成果與不足基礎(chǔ)上,提出了應(yīng)用于中壓配電網(wǎng)單端行波故障測距新方法,大大提高了信號頻率分辨能力與測距精確度。該方法首先通過以故障波形信息自建立母小波函數(shù),提高了母小波的適應(yīng)性與特征頻率提取的分辨能力;由上一步確定的故障特征頻率,再從小波尺度圖進一步對其進行修正。大量的仿真實驗證明,基于該方法的單端故障測距適應(yīng)性好,定位精度高。關(guān)鍵詞:故障測距;行波;連續(xù)小波變換;特征頻率;母小波Anewsingle-endedtravelingwavesfaultlocationmethodbasedoncharacteristicfrequencyLI
3、ANGRui一,JINZheng。LIUJian.hua2,f1.StateKeyLaboratoryofPowerTransmissionEquipment&SystemSecurityandNewTechnology,ChongqingUniversity,Chongqing400044,China;2.SchoolofInformationandElectricalEngineering,ChinaUniversityofMining&Technology,Xuzhou221008,China;3.DongyingPowerSupplyCompany,ShandongElect
4、ricPowerCorporation,Dongying257000,China)Abstraet:Thetransientcharacteristicpropagatestobothendsof1inefromfaultpointwhenafaultOccursinthedistributionnetworks.Adeterminedmathematica1relationshipiSobtainedbetweencharacteristicfrequenciesanddistancefromthefaultpointtoobservationpoint.Theidentifica
5、tionofwavefrontisunnecessarywhenusingtransientsignalanalysisbasedoncharacteristicfrequencies.SOthatfaultlocationerroriSavoidedduetowaveformdistortionoftimedomainanalysis.Someachievementsandshortcomingsaresummarizedfromformerpapers,andanewsingle-endedfaultlocationmethodisproposedandappliedtomedi
6、umdistributionnetworks,whichimprovessignalfrequenciesresolutionandfaultlocationaccuracy.Theproposedprocedurebuildsanfault.waveforil1.inferedmotherwaveletsfirstly.whichenhancestheadaptabilityofmotherwaveletsandresolutionofcharacteristicfrequencies;thencharacteristicfrequenciesarecorectedbyscalog
7、ramintimedomainbasedondeterminedfrequenciesontheformerstep.Manysimulationsshowthenewmethodhasgoodadaptabilityandhighfaultlocationaccuracy.Keywords:faultlocation;travelingwave;CWT:characteristicfrequency;motherwavelet中圖分類號:TM773文獻標