基于HILBERTHUANG变换的牵引供电系统电能质量检测方法的研究

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1、西南交通大学硕士学位论文基于Hilbert-Huang变换的牵引供电系统电能质量检测方法的研究姓名：苏玉香申请学位级别：硕士专业：电力系统及其自动化指导教师：刘志刚20080401西南交通大学硕士研究生学位论文第1I页次谐波信号。对分离出的单分量谐波信号进行Hilbert变换，可以得到各次谐波的瞬时频率和瞬时幅值，即可以得到真正意义上的时频分布。关键词：电能质量检测；谐波检测；Hilbert．Huang变换；EMD：电气化铁道谐波；西南交通大学硕士研究生学位论文第1lI页AbstractWiththepervasio

2、nofpowerelectronicsapparatusandnonlinearloads，recentlythepowerqualityproblemshavebeenmoreandmoredeterioratedbythedistortedwaveformofvoltagesandcurrentsinpowernetwork．TraditionalpowerqualityanalysismethedisFouriertransform．Asatraditionalanalysistoolinfrequencydo

3、main，itisnotsuitableforthenon—stationaryandnon—linearsignalsprocessing．Thusnewanalysismethodsarerequiredtodetectandanalysispowerqualitydisturbancesaccurately．Hilbert-HuangTransform(HHT)isappliedindetectionandanalysisofpowerqualityinthispaper．Shorttimepowerquali

4、tydisturbancesandharmotiesaretakenmoreconsideration．Forthefirsttime，Hilbert-HuangTransformisappliedtodetectharmonicintractionpowersysteminthispaper．AndsimulationresultsshowthatthismethodiSeffectivetoextractharmonic．Themaincontributionisgavenasfollows：Hilbert—Hu

5、angTransformisstudieddeeplyanditisappliedtopowerqualityinpowersystem，suchasshorttimepowerqulitydisturbancesincludingvoltagesags，voltageswells，interruption，transientoscillasionandtransientinterruption，andharmonicsincludingintegerharmonic，non·integerharmonic，tran

6、sientharmonicdistortion，andSOon．InordertorestraintheendeffectsofHilbert—Huangtransform，twonewmethods，combinationofsupportvectorregressionmachinesandmirrorizingextension，combinationofBPneutralnetworkandmirrorizingextension，areproposedinthispaperbasedontheorigina

7、lextensionmethods．Themeritsofsupportvectorregressionmachines，BPneutralnetworkandmirrorizingextensionarediscussed，andthedisadvantagesofthemarelisted．SimulationresultsshowthatthetwomethodsareeffectivetoimprovetheendeffectsofHHT．Comparisionofthetwomethodsisgivenin

8、thispaper,andtheresultsshowthattheformernewmethodiSbetterthanthelatterformostofsimulationandrealsignals．西南交通大学硕士研究生学位论文第1V页ThecharateritsicofharmonicsintractionpowersystemIS