|
|
中国电机工程学报 2008, 28(4) 109-113 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
|
|
|
|
本期目录 |
下期目录 |
过刊浏览 |
高级检索
[打印本页]
[关闭] |
|
| 输配电及供电 |
|
|
基于希尔伯特-黄变换的电力系统谐波分析 |
|
|
李天云 程思勇 杨梅 |
|
|
东北电力大学电气工程学院 东北电力大学电气工程学院 东北电力大学电气工程学院 |
|
|
摘要:
准确的谐波分析对电力系统稳定具有重要意义。为克服FFT方法与小波分析方法的缺点,提出将希尔伯特-黄变换(Hilbert-Huang transform, HHT)用于谐波分析。将谐波信号进行经验模态分解(empirical mode decomposition, EMD),得到一系列经验模态函数(intrinsic mode function, IMF)。由于不同的IMF对应不同的谐波分量,通过对每个IMF分量进行Hilbert变换(HT)及最小二乘拟和,最终可以得到各次谐波的幅值、频率和相位,从而实现电力系统谐波的准确分析。在经验模态分解过程中,采用了分段三次Hermite插值,并通过添加极值的方法减轻边缘效应的影响,使谐波分析能够更准确。仿真表明,Hermite插值比三次样条插值对谐波分析更具优势。该方法分析电力系统谐波精度高,能够取得满意的效果。 |
|
|
关键词:
希尔伯特-黄变换
经验模态函数
最小二乘
Hermite插值
电力系统谐波
|
|
|
Power System Harmonic Analysis Based on Hilbert-Huang Transform |
|
|
LI Tian-yun CHENG Si-yong YANG Mei |
|
|
|
|
|
Abstract:
To analyze harmonic accurately is significant to the stability of power system. HHT (Hilbert-Huang Transform) is adopted to analyze harmonic in order to overcome the shortcoming of FFT method and wavelet analysis method. The power quality signals are decomposed by empirical mode decomposition (EMD) method, and then a series of intrinsic mode function (IMF) are obtained. Owing to different IMFs correspond to different harmonic, all harmonic' amplitudes, frequencies and phases can be achieved via Hilbert transform (HT) plus Least Square fitting, to realize accurate analysis of power system harmonic. During the procession of EMD, piecewise Cubic Hermite Interpolating Polynomial is employed. Furthermore, in order to alleviate edge effects the method of adding extremes is used. Simulation indicates that Hermite interpolation is superior to the cubic spline interpolation in harmonic analysis. The method has high precise and is satisfied to analysis power system harmonic. |
|
|
Keywords:
Hilbert-Huang transform
intrinsic mode function
least square
Hermite interpolation
power system operation
|
|
|
收稿日期 2006-09-20 修回日期 1900-01-01 网络版发布日期 |
|
|
DOI: |
|
|
基金项目:
|
|
|
通讯作者: 李天云 |
|
|
作者简介: |
|
作者Email: tyleee@126.com |
|
|
| 参考文献: |
|
| 本刊中的类似文章 |
| 1.刘双宝 吕超 于继来 王立欣.希尔伯特-黄变换在变压器局部放电脉冲识别中的应用[J]. 中国电机工程学报, 2008,28(31): 114-119 |
| 2.李天云 谢家安 张方言 李晓晨.HHT在电力系统低频振荡模态参数提取中的应用[J]. 中国电机工程学报, 2007,27(28): 79-83 |
| 3.周云龙 王强 孙斌 张永刚.基于希尔伯特-黄变换与Elman神经网络的气液两相流流型识别方法[J]. 中国电机工程学报, 2007,27(11): 50-56 |
|
| Copyright by 中国电机工程学报 |