漏电感参数辨识技术在线监测变压器绕组变形.pdf

《漏电感参数辨识技术在线监测变压器绕组变形.pdf》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、第32卷第11期高电压技术VoI.32No.112006年11月HighVoItageEngineeringNov.2006·67·*漏电感参数辨识技术在线监测变压器绕组变形郝治国，张保会，李朋，高晶，王强（西安交通大学电气学院，西安710049）摘要：电力变压器运行过程中发生绕组变形将会导致绕组漏感参数发生变化，为了实现变压器绕组的在线监测和预知性维修，以变压器回路方程作为参数辨识模型，提出了一种利用最小二乘算法进行绕组漏电感参数实时辨识从而实现绕组变形在线监测方法，推导了用于变压器漏电感参数辨识的

2、方程，分析了辨识结果产生误差的原因，并对忽略励磁电流带来的误差进行了补偿。动模试验数据及仿真数据验证了参数辨识结果具有较高的精度，且不受负荷变化及功率因数变化的影响，同时利用绕组模拟变形数据验证了绕组变形在线监测实现的可行性。关键词：漏电感；参数辨识；绕组变形；在线监测；最小二乘；回路方程中图分类号：TM403.2文献标识码：A文章编号：1003-6520（2006）11-0067-04StudyonOn-lineDetectingofTransformerWindingDeformationBase

3、donParameterIdentificationofLeakageInductanceHAOZhiguo，ZHANGBaohui，LIPeng，GAOJin，WANGOiang（SchooIofEIectricaIEngineering，Xi’anJiaotongUniversity，Xi’an710049，China）Abstract：TransformersarereguiredtodemonstratetheabiIitytowithstandshortcircuitcurrents.Inp

4、ractice，overcurrentscausedbyshortcircuitcangiverisetowindingsdeformation，whichisamainformofhiddenheaIthtroubIeorfauItoftrans-former.Thus，on-IinedetectingoftransformerwindingdeformationisofpracticaIsignificanceforthesafeandreIiabIeopera-tionofthetransfor

5、mer.Inthispaper，anoveImethodisproposedtomonitorthestateoftransformerwindings，whichisa-chievedthroughon-IinedetectingtheIeakageinductanceofthewindings.ThismethodisbasedonthefactthatthewindingsdeformationcancausethevariationoftheIeakageinductanceofthetran

6、sformer.First，theeguivaIentcircuiteguationofthetransformerisgiventoderivethemodeIforidentifyingtheIeakageinductanceofthewindings.Then，thiseguationisutiIizedtoidentifytheIeakageinductanceofthewindingsbyusingtheIeastsguareaIgorithm（LSA）.Furthermore，theeff

7、ectofmag-netizingcurrent，measurementerrorsandmodeIinaccuracyontheidentificationerrorareanaIyzed，andthecorrectedmodeIisaIsogiventodecreasethisadverseeffectontheresuIts.FinaIIy，thedynamictestiscarriedouttoverifythemethod.FromthetestresuIts，someconcIusions

8、canbedrawnasfoIIows.（1）TheidentificationresuItsareaccurate.Theomissionofmagneti-zingcurrentmayaffecttheIeakageinductanceidentifiedon-Iine，whichcanbeweakenedbycompensation.（2）Theidentifi-cationaIgorithmisstabIe.Theidentificationre