文档名：基于扩展卡尔曼滤波的水中放电阶段辨识方法
摘要：水中脉冲放电的电弧通道发育具有强随机性,难以固定时域进行放电阶段划分,故水中脉冲放电阶段的辨识方法研究极为重要.首先,该文建立了水中脉冲放电等效电路模型并阶段化分析了电阻时变特性,得到了判定放电阶段的临界参数阈值;其次,采用扩展卡尔曼滤波算法将离散电阻数据连续化,同时降低随机放电带来的噪声,从而获得辨识时变电阻模型;再次,计算辨识电阻斜率,并依据斜率变化特性及变化系数判定预击穿放电阶段和剧烈放电阶段;最后,通过水中脉冲放电观测试验平台验证了该辨识方法的有效性.结果表明,基于扩展卡尔曼滤波算法得到的水中脉冲放电电阻较试验值的方差小于1.717?2,电阻斜率方差小于1.899,故该方法可用于水中脉冲放电阶段的判定.
Abstract：High-voltagepulseddischargeinwaterisacomplexplasmagenerationandcollapseprocessinvolvingcoupledphysicalprocesses,suchaselectricity,light,andheat.Thedischargeprocessconsistsofpre-breakdown,violent,andoscillatorydischargestages.Themainexistingmethodfordeterminethedischargestageisbyusinghigh-speedcameraphotography,butthisapproachisnotsuitableforpracticalapplicationsenvironmentofpulseddischargetechnologyinwater.Additionally,thedevelopmentofthearcchannelduringrepeateddischargesexhibitsstrongrandomness,makingitdifficulttoclassifydischargestageswithinafixedtimedomain.Therefore,studyingtheidentificationmethodoftheunderwaterdischargestageiscrucial.Thispaperproposesacorrespondingmethodbasedonthearcimpedancechangecharacteristicsofthedischargeinwater.Firstly,theplasmachangecharacteristicsobservedateachdischargestageareamalgamatedtoelucidatethevariationsinresistance.Theinitialplasmachannelisformedduringthepre-breakdowndischargestage.Itcontinuestoionizetoformamorerobustinitialarcchannelundertheactionofanexternalelectricfield,withamorestableandlineardeclineinresistance.Subsequently,adensearcisestablishedoncetheplasmadensitywithinthechannelsurpassesacriticalthreshold,leadingtoasuddensurgeinplasmadensityandarapiddecreaseinresistance.Nevertheless,withthediminishingstrengthoftheexternalelectricfield,sustainingabalancedarcdischargebecomesimpracticable,resultingintheextinctionofthearc.Thechannelretainsasubstantialplasmathatgraduallydiminishesovertimeatthisstageandmakestheresistanceprogressiveincrease.Secondly,thedischargeprocessinwaterismainlycarriedoutinaninhomogeneousmedium.Hence,thearcchannelmorphologyandspatiallocationarerandom,andtheresistancevalueswithineachdischargecycleinarepetitivedischargeenvironmentalsovary.TheExtendedKalmanFilteringalgorithmfiltersthemeasuredresistancedataagainsttherandomness,thusobtainingarepresentativevalueoftheidentifiedresistance.Solvingtheslopeoftheresistancechangeateachmomentandcombiningitwiththecharacteristicsofthechangesineachdischargestage,athresholdvaluefortheresistancechangerateisderived.Thisthresholdvalueservesasacriteriontodeterminethetransitionofthedischargestage.Finally,theexperimentalplatformforpulsedischargeobservationinwaterconfirmedtheeffectivenessofthemethod,andananalysisoferrorswasconducted.Furtherexperimentalvalidationanalyseswerecarriedoutatthebiggestdistanceelectrodegapsof2.04mmand3.01mmbasedongapdistancesequalto0.62mm,1.01mm,and1.38mm.Additionally,theconductivityofthesolutionisincreasedto4685.13μS/cm,6740.45μS/cm,7820.62μS/cm,12340.68μS/cm,and19319.25μS/cm,respectively.TheresultsindicatethatthevarianceoftheidentifiedresistancevaluesobtainedbasedontheExtendedKalmanFilteralgorithmforunderwaterpulsedischargeislessthan1.717?2comparedtotheexperimentallymeasuredresistancevalues.Moreover,thevariancesofthetwotype'sresistanceslopesarelessthan1.899,witharelativeerroroftheresistanceslopebeinglessthan8.9%.Despitevariationsinelectrodegapdistanceandsolutionconductivity,thismethodmaintainshighaccuracy.Thus,itissuitablefordeterminingdischargestagesintheunderwaterpulsedischargeprocess.
作者：高崇 邵在康 康忠健 傅雪原 侯腾飞 Author：GaoChong ShaoZaikang KangZhongjian FuXueyuan HouTengfei
作者单位：中国石油大学(华东)石大山能新能源学院青岛266580中国石油集团工程技术研究院有限公司北京102206
刊名：电工技术学报 ISTICEIPKU
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(11)
分类号：TM89
关键词：水中脉冲放电 时变电阻 扩展卡尔曼滤波 放电阶段辨识
Keywords：Pulsedischargeinwater time-varyingresistance extendedKalmanfiltering(EKF) dischargestageidentification
机标分类号：TP274TM89O461.25
在线出版日期：2024年6月18日
基金项目：国家重大科技专项，中国石油大学(华东)研究生创新基金资助项目基于扩展卡尔曼滤波的水中放电阶段辨识方法[
期刊论文] 电工技术学报--2024, 39(11)高崇 邵在康 康忠健 傅雪原 侯腾飞水中脉冲放电的电弧通道发育具有强随机性,难以固定时域进行放电阶段划分,故水中脉冲放电阶段的辨识方法研究极为重要.首先,该文建立了水中脉冲放电等效电路模型并阶段化分析了电阻时变特性,得到了判定放电阶段的临界参...参考文献和引证文献
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