基于MUSIC算法的電力諧波、間諧波頻譜估計(jì)方法研究.pdf

1、長沙理工大學(xué)碩士學(xué)位論文基于MUSIC算法的電力諧波、間諧波頻譜估計(jì)方法研究姓名：蔣瓊申請學(xué)位級別：碩士專業(yè)：高電壓與絕緣技術(shù)指導(dǎo)教師：羅日成201205ABSTRACTWiththedevelopmentofeconomyandtheimprovementofpeople’Slivingstandard，thestableoperationofthepowersystemanditspowerqualityleveldirectlyi

2、nfluencesthedevelopmentofthenationaleconomy，especiallywhenlotsofpowerelectronicdevicesandnonlinearloadusedinelectricpowernetwork，suppressionofelectricharmonicwaveisfacingunprecedentedchallengeHarmonicanalysisisthefocusof

3、powerqualityanalysisforalongtime，notonlythehamonicinintegertimesbutalsoinerharmonics，whichishamonicinnonintegertimes，isexistedinthepowergridInThepastfewyears，harmonicanalysishasgotgooddevelopmentbecauseofthejointeffortso

4、fthedomesticandforeignexpertsandscholars，andtheintroductionofvariousalgorithminfectnewtechnologyforHarmonicanalysisHarmonicanalysisismainlybasedondetectionoffrequency，phase，amplitudeandpowerofelectricalsignal，andanalysis

5、theircurvewithtimevariationTherefore，accurateharmonicparameterestimationisthepremiseforsuppressionandmanageofharmonicandinerharmonicsThecommonparsingalgorithmofharmonicandinerharmonicsparameterestimationmainlyincludeFour

6、iertransform，Wavelettransform，NeuralNetworkAnalysis，andSpatialspectrumTheyallhaveadvantagesanddisadvantagesthemselves，therefore，itisveryimportanttofindappropriateparsingalgorithmThisarticlediscussedharmonicandiner—harmon

7、icsparameterestimationfromseveralaspect，suchasFouriertransform，Wavelettransform，anmodemspectrumThemainlyusedanalysismethodforgridharmonicisbasedondisperseFouriertransform(DFT)DFTislimitedoperation，whenitiscuttingoffinfin

8、itesignalitwillformspectralleakageToImprovetheresolutionoftheanalysis，Addwindowinterpolationalgorithm，whichreducesleakageontheprincipleofincreasingsamplingpoint，isquotedinthealgorithm，however，thespectralleakageproblemisn

9、otsolvedfundamentallyAlongwiththedevelopmentofthetheoryofwavelet，harmonicanalysismethodbasedonitappearedAlthoughthewavelettheoryhasitsownadvantages，ithasmanyshortageswhenappliedinharmonicanalysis，forexample，itwillproduce