谐波和间谐波三参数识别的SSI-LS方法.pdf

《谐波和间谐波三参数识别的SSI-LS方法.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39卷第10期电力系统保护与控制v01．39NO．102011年5月16日PowerSystemProtectionandControIMay16，20It谐波和间谐波三参数识别的SSI—LS方法李天云，袁明哲，郑波，许洁，于奉振(1．东北电力大学电气工程学院，吉林吉林132012；2．澳大利亚皇家墨尔本理工大学电气和计算机_T-程学院，澳犬利亚墨尔本3001)摘要：为精确检测谐波和间谐波的三参数，提出了基于随机子空间辨识(stochasticSubspaceIdentification，SSI)与最小二乘(LeastSquare)法的谐波和间谐波三参数检测方法。运用

2、奇异值差值法确定SSI—LS算法的阶数；利用SSI算法直接对原始含噪信号精确检测出各谐波和间谐波分量的频率；当信噪比大于20dB时，应用最小二乘法对各谐波和间谐波分量进行幅值和相位的估计，从而实现了谐波和间谐波的三参数识别。分别针对含有噪声和直流分量的谐波和间谐波数值仿真信号和频率相近且幅值相差百倍的谐波和间谐波信号作谐波和间谐波的三参数识别。仿真分析表明该方法抗噪声能力强、检测精度高、计算速度快，尤其是对信号中各谐波和间谐波分量的相位检测精度高、对频率相近且幅值相差百倍的谐波和间谐波信号具有较高的分辨率，为电力系统谐波和间谐波的精确检测提供了新的思路与方法。关键词：谐

3、波；间谐波；奇异值差值法；随机子空问；最小二乘法Amethodofthreeparametersofharmonicsandinter-harmonicshighaccuracydetectionbasedonSSI-LSLITian．yun，YUANMing．zhe，ZHENGBo，XUJie，YUFeng．zhen(1．ElectricalEngineeringCollege，NortheastDianliUniversity，Jilin132012，China；2．ElectricalandComputerEngineeringSchool，RMITUnivers

4、ity，MelbourneVIC3001，Australia)Abstract：Inordertodetectaccuratelythreeparametersofharmonicandinter‘harmonic，amethodofthreeparametersofharmonicsandinter．harmonicdetectionbasedonStochasticSubspaceIdentification(SSI)andleastsquares(LS)isproposed．TheorderofSSI．LSalgorithmistestedbyuseofthesi

5、ngularvaluedifferencemethod，andtheactualfrequencyofeachharmonicandinter-harmoniccomponentintheoriginalnoisysignalisaccuratelydetectedbySSIalgorithm，andthemethodofleastsquaresisappliedtoestimatethephaseandamplitudeoftheharmonicandinter—harmonicscomponentwhenSNRismorethan20dB．Sothreeparame

6、tersofinter-harmonicsareidentifiedcompletely．ThenumericalsimulationsignalswithnoiseandDCcomponentandthesignalswithsimilarfrequencyandhundredfold·diferenceamplitudeareidentifiedbyusingthreeparametersofharmonicandinterharmonicdetection．Simulationanalysisshowsthatthemethodhasstronganti-nois

7、eability，highdetectionaccuracyandfastcalculationspeed，especiallyhashighprecisionandresolutionforthephaseofinter—harmonicsignalwithsimilarfrequencyandhundredfold-diferenceamplitude．Itprovidesanewmethodfortheharmonicprecisiondetectioninpowersystem．ThisworkissupportedbyNatio