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《改进汉明Burg和稳健支持向量机的间谐波检测.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26卷第6期电力系统及其自动化学报Vo1.26No.62014年6月ProceedingsoftheCSU-EPSAJun.2014改进汉明Burg和稳健支持向量机的间谐波检测崔晓荣,王军,林莉t,孙章,田攀(1.西华大学电气信息学院,成都610039;2.四川中电启明星信息技术有限公司,成都610000)摘要:问谐波具有非线性、随机性及非平稳性等特点,在实时检测中具有一定困难。为精确检测出所含间谐波分量,文中先利用改进汉明Burg算法检测间谐波的频率,该算法按二阶预测误差输出功率最小原则求解一、二阶系数,求高阶系数时进行汉明加权,选取阶次时引入控制参数;
2、再用稳健支持向量机法校正检测出的频率分量,并获得其幅值和相位。仿真结果表明,该算法检测频率时,减弱了谱峰偏移度且不易出现谱线分裂,低信噪比时不会出现谱峰消失现象,提高了频率检测精度;用稳健支持向量机法校正频率可精确得出间谐波的频率、幅值和相位,且计算量小。关键词:间谐波;自回归模型;伯格算法;汉明加权;稳健支持向量机中图分类号:TM711文献标志码:A文章编号:1003—8930(2014)06—0030—07ModifiedHammingWeightedBurgandRobustSupportVectorMachineAlgorithmforInter-h
3、armonicsDetectionCUIXiao—rong,WANGJun,LINLi,SUNZhang,TIANPan(1.SchoolofElectricalandInformationEngineering,XihuaUniversity,Chengdu610039,China;2.TheSichuanCLPAostarInformationTechnologiesCo.,Ltd.,Chengdu610000,China)Abstract:Duetothenon-linearity,randomness,instability,etc.,itishig
4、hlydifficulttocarryoutthereal-timein-ter-harmonicsdetection.Inordertodetecttheinter—harmoniccomponentaccurately,themodifiedHammingweightedalgorithmisinitiallyutilizedforthefrequentcomponentsdetection.Thefirstandsecondcoefficientsareobtainedbymin’imi—zingthetotlaoutputpowerofsecondo
5、rderpredictionerror,andtheotherhighercoefficientsarecalculatedviahammingweighted,andthecontrolparameterisintroducedinthemodelorderselectiom.Theneachfrequencyofde—tectedwascorectedbyrobustsupportvectormachinealgorithmwhichcouldgetaccuratefrequency,meanwhileam—plitudeandphaseofinter-
6、harmonicareobtained.Simulatedresultsdemonstratethatwhendetectingthefrequencycomponent,thepeakshiftingisreducedandspectralsplittingisnotmanifest;thephenomenonofspectraldisappearwillvanishwithlowsignaltonoiseration,andtheaccuracyoffrequencydetectionisimproved;thefrequencycompo—nentsa
7、recalibratedbyrobustsupportvectormachine,meanwhiletheamplitudeandphasecanbeobtained,moreoverthecomputationiscurtailed.Keywords:inter—harmonics;autoregressivemodel;Burgalgorithm;Hammingweighted;robustsupportvectorma-chine间谐波是一种特殊的谐波,大量存在于电力套可行性强且能够精确检测出间谐波分量的方案系统中,它是指非整数倍基波频率的谐波[1】。
8、间谐具有重要的意义。波的存在,严重影响了电网的电能质
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