| 基于时频平面脊信息提取的间谐波分析新方法 |
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| 引用本文： | 金国彬,李玲,黄绍平.基于时频平面脊信息提取的间谐波分析新方法[J].湖南工程学院学报(自然科学版),2008,18(2):5-8. |
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| 作者姓名： | 金国彬 李玲 黄绍平 |
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| 作者单位： | 湖南工程学院电气与信息工程系,湖南湘潭,411101 |
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| 摘 要： | 针对电力系统间谐波分析的局限性,提出一种基于时频平面脊信息提取的间谐波分析新方法.该方法首先基于自适应最优核时频分布理论得到间谐波信号的时频分布,然后进行时频平面脊信息的提取,从而得到各间谐波分量频率随时间变化的特征.同仅采用时频分布刻画间谐波信号时频分布特性相比,该法具有更高的时频分辨率及更强的信息可读性.仿真及实测数据分析结果表明：该方法表现出很高的时频聚集性,且不受交叉项的影响,清晰地刻画出各间谐波分量的时变性特征,对各频率分量相隔较近的信号仍然有效.
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| 关 键 词： | 时频分布 自适应最优核时频分布 脊 间谐波 |
A New Method of Inter-harmonics Analysis Based on Ridges of Time-frequency Plain |
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| JIN Guo-bin,LI Ling,HUANG Shao-ping.A New Method of Inter-harmonics Analysis Based on Ridges of Time-frequency Plain[J].Journal of Hunan Institute of Engineering(Natural Science Edition),2008,18(2):5-8. |
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| Authors: | JIN Guo-bin LI Ling HUANG Shao-ping |
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| Institution: | (Dept. of Elect. and Information Eng. , Hunan Institute of Engineering, Xiangtan 411101, China) |
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| Abstract: | Limitation exists in inter-harmonics analysis.A new method of inter-harmonics analysis based on ridges of time-frequency plain is presented in this paper.Firstly,time-frequency distribution of inter-harmonics is acquired based on adaptive optimal kernel time-frequency distribution.Then ridges are detected from time-frequency plain.Therefore,all kinds of characteristics of inter-harmonics signal can be detected and identified.The testing results show that the method has higher time-frequency resolution and better information readability than adaptive optimal kernel time-frequency distribution.It is independent from cross components,and the time-frequency plain characteristics of time varied inter-harmonics are revealed distinctly.In condition of small frequency difference,the method is still valid. |
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| Keywords: | time-frequency distribution AOK TFR ridge inter-harmonics |
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