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时间:2020-03-28
《提升经验模态分解检测低频振荡模式精度的改进算法研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第41卷第22期电力系统保护与控制V_o1.41No.222013年11月16日PowerSystemProtectionandControlNOV.16.2O13提升经验模态分解检测低频振荡模式精度的改进算法研究易建波,黄琦,丁理杰,张华(1.电子科技大学电力系统广域测量与控制四川省重点实验室,四川成都611731;2.四川电力科学研究院,四川成都610072)摘要:基于实测受扰轨迹分析低频振荡问题已成为现代电力系统稳定性分析的重要手段。针对经验模态分解(EMD)方法分析低频振荡信号时,影响该方法精度的端点效应、频率
2、漂移、模态混叠、阻尼损失等问题,分别提出基于ARMA模型的端点延拓法、B样条插值法、精细化复小波分析法及能量微差因子控制法加以解决。通过这些方法的混成应用,设计出一套改进的应用算法,有效提高了低频振荡信号非平稳特性参数检测精度。最后,通过EPRI-36仿真算例和RTDS实时算例测试,验证了所提算法检测复杂低频振荡信号模式信息具备很高的有效性和精度。关键词:低频振荡;非平稳信号;经验模态分解;模态混叠;复小波分析Researchonanimprovedalgorithmtoenhancethedetectionaccur
3、acyoflow—frequencyoscillationmodesbyempiricalmodedecompositionYIJian—bo,HUANGQi,DINGLi-jie,ZHANGHua2(1.UniversityofElectricScienceandTechnologyofChina,TheKeyLabofWide—areaControlandMeasurementonPowerSystemofSichuanProvince,Chengdu611731,China;2.SichuanElectricPo
4、werResearchInstitute,Chengdu610072,China)Abstract:Thecharacteristicanalysisoflow-frequencyoscillationbasedondisturbedmeasuredtrajectorygraduallybecomesanimportantmeansofmodemlargegridstabilityanalysis.Whenempiricalmodedecomposition(EMD)methodisusedtoanalyzethelo
5、w-frequencyoscillationsignal,theproblems,suchasendefect,frequencydrift,modemixinganddampingloss,willafecttheanalysisaccuracyofthemethod.So,theARMAmodel—basedendpointextensionmethod,theBsplineinterpolationmethod,thefinecomplexwaveletanalysisandtheenergydiferencef
6、actorcontrolmethodareproposedseparatelytosolvetheaboveproblems.Animprovedalgorithmisdesignedbythehybridapplicationoftheabovemethod,whichefectivelyimprovestheaccuracyofdetectingsignalnon—stationarycharacteristics.Finally,throughthetestingandanalysisofEPRI-36simul
7、ationcaseandRTDSreal-timecase,itisverifiedthattheproposedalgorithmhashighaccuracyandefectivenesstodetectthemodesinformationofcomplexlow-frequencyoscillationsigna1.ThisworkissupportedbyNationalNaturalScienceFoundationofChina(No.51277022).Keywords:low-frequencyosc
8、illations;non-stationarysignal;empiricalmodedecomposition;modemixing;complexwaveletanalysis中图分类号:TM712文献标识码:A文章编号:1674—3415(2013)22.0071-08法受制于模型的阶数和参数准确性以及未建模动态0引言和交
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