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1、高电压技术第36卷第6期2010年6月30日1494HighVoltageEngineering,Vol.36,No.6,June30,2010采用全相位基波信息提取的介损测量黄翔东,王兆华(天津大学电子信息工程学院,天津300072)摘要:为提高电容介损测量精度和降低计算量,提出了结合全相位数据预处理与基波信息提取的测量方法。并指出提高精度的根本途径在于改善序列截断引起的谱泄漏效应,故首先将电流和电压样本数据进行全相位预处理,然后将得到的数据与离散基波序列内积,再从内积结果提取电流和电压相位差而测出介损正切值。此方法无需引入附加的解析变换、数字滤波及离散傅立叶变换(DFT)措施
2、,因而信号处理流程简单;由于全相位预处理抑制了各次谐波对基波的干扰,因而大大提高了测量精度。仿真实验表明:此算法的测量精度比传统正交滤波法高出2~3个数量级,其耗费的乘法计算量也仅为改进的正交滤波法的2.7%。关键词:介损;全相位预处理;基波;相位;谱泄漏;内积;正切中图分类号:TM835;TM934.32文献标志码:A文章编号:10036520(2010)06149407UsingAllphaseExtractingFundamentalWaveInformationtoMeasureDielectricLossHUANGXiangdong,WANGZhaohua(Sch
3、oolofElectronicInformationEngineering,TianjinUniversity,Tianjin300072,China)Abstract:Toimprovetheaccuracyandtoreducethecomputationamountofmeasuringcapacitorsdielectricloss,weproposedadeterminationmethodcombiningallphasedatapreprocessingandextractingtheinformationoffundamentalwave.Itwasfoundth
4、attheessentialapproachofenhancingtheaccuracylayinimprovingtheeffectofspectralleakagearisingfromsequencetruncation.Thusthecurrentandvoltagesamplesrequiredtobeallphasepreprocessedfirst,andtheprocesseddataanddiscretesequenceoffundamentalwavewerecollectedtomaketheinnerproduct,fromwhichtheinformat
5、ionofthephasedifferencebetweencurrentandvoltagecouldbeextractedsothatthetangentvalueofdielectriclosscouldbedetermined.Theproposedmethoddoesnotrequireanyothermeasureslikeanalyticaltransformation,digitalfilteringorDFT,theprocessingflowissimplified.Moreover,sincetheallphasepreprocessingcansuppress
6、theindividualharmonicsspectralinterferenceonthefundamentalwave,theaccuracyisgreatlyenhanced.Simulationshowsthatthemeasuringprecisionoftheproposedalgorithmis2~3amountlevelshigherthanthatofconventionalorthogonalfilteringmethod.Moreover,theamountofconsumedmultiplicationisonly2.7%ofthatofthemodif
7、iedorthogonalfilteringmethod.Keywords:dielectricloss;allphasepreprocessing;fundamentalwave;phase;spectralleakage;innerproduct;tangent[24]波分析法,此法需先借助传感器等装置分别测量0引言运行电压和流经试品的电流,再将模拟信号转化为介质损耗角正切是衡量电力设备绝缘性能的重数字信号,然后采用离散傅立叶变换(
