文档名：地下交叉互联高压电缆分布式护层电流传感系统的时滞控制方法
摘要：交叉互联高压电缆系统中的分布式护层电流检测对于护层接地故障诊断至关重要.为解决地下高压电缆不依赖外部时标的分布式护层电流传感时间同步问题,该文基于交叉互联高压电缆护层间的耦合关系,采用并联Smith预估补偿器提升时滞补偿效率,获取残差最小的时间偏置补偿时滞量,提出多护层电流传感器时滞误差的递归最小二乘跟踪方法,以电容电流短时不变为稳定判据,对实际测量时分布式护层电流传感器之间的时延进行估计和控制.该方法在220kV高铁牵引变压器一次侧高压电缆分布式护层电流传感系统上进行了试验验证,验证结果表明,该方法收敛至最小残差值点,平均残差为0.30A,准确时滞量为3.93s,能实现分布式护层电流传感的时间同步.
Abstract：UndergroundHV(HighVoltage)cableisthebackboneofmodernurbanpowersystems.Inthelastdecades,thesheath-to-groundfaultisbecomingoneofthemainmodescontributingtothesingle-phasegroundingfault.Sheathcurrentsensingiswidelyadoptedinfieldteststodetectthesheath-to-groundfault.However,thesynchronizationofdistributedsheathcurrentsensingbasedonGPS(GlobalPositionSystem)orBeidouisunstablebecausethetimetransfertagisusuallyunavailableinundergroundcabletunnels.Therefore,atimedelaycontrolmethodbasedontheSmithpredictorcompensatorandrecursiveleastsquaresmethod(RLSM)isproposedusingthecapacitivecurrentasareferenceofthemeasuredsheathcurrentinthesamesheathloop.Firstly,thearchitectureofthedistributedsheathcurrentsensinginHVcross-bonedcablesystemsisintroduced,andtheformulationofthemeasuredsheathcurrentinthesamesheathloopwithtimedelayisdeduced.Secondly,theelectromagneticcouplingrelationshipbetweenthesheathcurrentandloadcurrentismodeled,andthephasordifferenceofthemeasuredsheathcurrentinthesamesheathloopwithouttimedelayisformulatedasthereferenceoftheRLSM.Thirdly,theparallelSmithpredictorisproposedtocompensateforthetimedelayerroroftheadjacentsheathcurrentdetectionpointsinthesamesheathloop.Finally,arecursiveleastsquaretrackingmethodforthetimedelayerrorofthemulti-sheathcurrentsensorisproposedtoobtainthetimedelaywiththeminimumresidual.Theproposedmethodisverifiedbyfieldtestsofa220kVcross-bonedcablesupplyingthehigh-speedtractiontransformer.Theresultsshowthatthewaveformofcapacitivecurrent,whichisthereferenceofRLSM,inosculateswellwiththedifferenceofthemeasuredsheathcurrentinthesamesheathloopafterusingtheproposedmethod.Themaximumdifferenceis0.297A,andtheminimumdifferenceis0.002A.Moreover,thereferencestandardfortimedelayestimationistheaverageresidualofthethreeloops,andtheminimumresidualofeachloopisbetween0.28～0.33A.Inaddition,theSmithpredictoristranslatedforthe197thtime,andtheresidualvalueintheoverallrangeisthesmallestwhenthetimedelayoffsetis3.94s,whichis0.3A.Thefollowingconclusionscanbedrawnfromtheexperiment:(1)Theinstantaneouscurrentdifferencebetweenadjacentsheathsinthesameloopinosculateswiththeinstantaneouscapacitorcurrentafterusingtheproposedmethod,whichimpliesthesynchronizationofdistributedsheathcurrentsensing.(2)Whendistributedsheathcurrentsensingisasynchronous,thecurrentphasordifferenceofthesheathisnotaccurate,whichwillaffecttheevaluationofthegroundingstateofthesheath.(3)Theproposedmethodconvergestotheminimumaverageresidualvalueof0.3Aintheglobalrange,andthetimedelayis3.94s.
作者：周莎莎 王航 杨斌 夏湛然 周承科 Author：ZhouShasha WangHang YangBin XiaZhanran ZhouChengke
作者单位：湖北工业大学新能源及电网装备安全监测湖北省工程研究中心武汉430068国网湖北省电力公司武汉供电公司武汉430024格拉斯哥卡里多尼亚大学格拉斯哥G40BA
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(4)
分类号：TM274
关键词：高压电缆 交叉互联 护层电流 在线监测 时滞控制
Keywords：HVcable cross-bonding sheathcurrent onlinemonitoring time-delaycontrol
机标分类号：TP273TM77TM922.73
在线出版日期：2024年3月5日
基金项目：湖北省电力公司科技项目，湖北工业大学科研启动基金地下交叉互联高压电缆分布式护层电流传感系统的时滞控制方法[
期刊论文] 电工技术学报--2024, 39(4)周莎莎 王航 杨斌 夏湛然 周承科交叉互联高压电缆系统中的分布式护层电流检测对于护层接地故障诊断至关重要.为解决地下高压电缆不依赖外部时标的分布式护层电流传感时间同步问题,该文基于交叉互联高压电缆护层间的耦合关系,采用并联Smith预估补偿器...参考文献和引证文献
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地下交叉互联高压电缆分布式护层电流传感系统的时滞控制方法 Time Delay Control Method for Distributed Sheath Current Sensing System of Underground Cross-Bonding High Voltage Cable
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