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1、第40卷第8期電力系統(tǒng)保護(hù)與控制v01.40NO.82012年4月16日PowerSvstemProtectionandControlApr.16,2012小電流單相接地故障在線定位裝置研究與實(shí)現(xiàn)鄭顧平,杜向楠,齊鄭,李琦,楊以涵(1.華北電力大學(xué),河北保定071003;2.新能源電力系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué)),北京102206)摘要:配電網(wǎng)單相接地故障在線定位是制約供電部門提高供電質(zhì)量的關(guān)鍵問題之一。通過對小電流接地系統(tǒng)單相接地故障進(jìn)行分析,研究基于零序功率方向和五次諧波分量法的在線定位方法,并設(shè)計了基于嵌入式系統(tǒng)的小電流故障定位裝置。該裝置基于ARM
2、Cottex-M3處理器,利用GPS技術(shù)和軟件跟頻技術(shù)實(shí)現(xiàn)了配電網(wǎng)廣域零序相量的獲取,并通過CSD通信網(wǎng)絡(luò)進(jìn)行遠(yuǎn)程無線數(shù)據(jù)傳輸。在線路的零序電流測量節(jié)點(diǎn)處,將變電站測量的零序電壓與線路節(jié)點(diǎn)的零序電流相位進(jìn)行比較,依據(jù)零序功率方向法和五次諧波分量法,準(zhǔn)確判斷故障點(diǎn)的位置。在10kV物理模型上進(jìn)行了仿真實(shí)驗(yàn),結(jié)果表明該裝置能較好完成信號同步測量與傳輸,可以實(shí)現(xiàn)小電流接地系統(tǒng)單相接地故障的檢測與定位。關(guān)鍵詞:小電流接地系統(tǒng);零序功率方向法;五次諧波分量法;嵌入式系統(tǒng);在線定位Researchandimplementationofneutralinefectivesin
3、gle—phasegroundfaultonlinelocationdeviceZHENGGu.ping,DUXiang.nan,QIZheng2,LIQi,YANGYi.ban2(1.NorthChinaElectricPowerUniversity,Baoding071003,China;2.StateKeyLaboratoryofAlternateElectricalPowerSystemwithRenewableEnergySources(NorthChinaElectricPowerUniversity),Beijing102206,China)Abs
4、tract:Withtheimprovementofuserrequirementsforthereliabilityofthepowerquality,faultlocationonlinefordistributionnetworkisnecessary.Throughanalyzingthesingle-phase-to—earthfaultofneutralinefectivegroundingsystem,thispaperresearchesonlinefaultlocationmethodbasedonzero—sequencepowerdirec
5、tionandquinticharmoniccomponentmethod,anddesignssmallcurrentfaultlocationdevicebasedonembeddedsystem.ThedevicebasesonARMCortexM3processor,usesGPStechnologyandsoftwareachievefrequencytechnologyforaccessingzerosequencephaseofwide-area,andcommunicatesthroughtheCSDnetwork.Inthezero—seque
6、ncecurrentmeasurementnodeside,itcompareszerosequencevoltageandzerosequencecurrentphase,throughzero-sequencepowerdirectionmethodandquinticharmoniccomponentmethod,accuratelydeterminesthefaultlocation.Theexperimentalresultson10kVphysicalmodelshowthatthedeviceCanbettermeasureandtransmitt
7、hezero-sequencesignal,andcanbeusedforsinglephasegroundfaultdetectionandlocation.ThisworkissupportedbyNationalNaturalScienceFoundationofChina(No.60974125).Keywords:neutralinefectivegroundingsystem;zero-sequencepowerdirection;quinticharmoniccomponentmethod;embeddedsystem;onlinelocation
8、中圖分類號:TM726文