| 摘要: |
| 结合小波变换良好的时频局部化特性和傅里叶变换良好的频域分析特性,提出小波变换与傅里叶变换相结合的暂态谐波分析方法。利用傅里叶变换和静态小波变换得到被测信号频域特性和时域特性,再结合连续小波变换得到暂态谐波的时频特性。理论分析和仿真试验结果表明,利用本方法得到的暂态谐波幅值与理论值一致。本方法能够准确分析电网中的暂态谐波,可为电力系统暂态谐波的分析和治理提供依据。 |
| 关键词: 暂态谐波 傅里叶变换 静态小波变换 连续小波变换 |
| DOI：10.11841/j.issn.1007-4333.2007.06.133 |
| 投稿时间：2007-03-23 |
| 基金项目:国家科技支撑项目;中国农业大学校科研和教改项目 |
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| Transient harmonic analysis algorithm using wavelet transform and Fourier transform |
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| Abstract: |
| This paper presents a novel algorithm to analyze transient harmonics.The algorithm combines the merits of wavelet transform and FFT transform.The frequency character of the sampled signal was obtained using FFT transform and the time domain character of the sampled signal was obtained using Stationary Wavelet Transform.Then the time-frequency character of transient harmonics was obtained using continuous wavelet transform.Theoretical analysis and simulation results validated that the algorithm presented in the paper could be used for precise transient harmonic analysis in power system. |
| Key words: transient harmonic,Fourier transform,stationary wavelet transform(SWT),continuous wavelet transform(CWT) |
