【摘要】 电力系统的谐波分析方法应该有良好的计算效率,并有良好的时域和频域分辨率。迄今为止,小波变换被广泛地应用于这个领域,但是小波基的选取等问题还需要进一步研究。近几年来,希尔伯特-黄变换的应用越来越多,该方法运用简便,而且并不涉及频率分辨率和时间分辨率的矛盾问题,是一个有很好应用前景的分析方法。把上述两种方法应用于电力系统的谐波分析,比较了两者的优缺点。结果表明,希尔伯特-黄变换有较好的计算效率,以及较好的时域和频域分辨率,但存在端点飞翼和瞬时频率轻微波动两个问题。更多还原

【Abstract】 For harmonic analysis of power system,it is expected that a desired analysis method should have good computation efficiency,and have good resolution in both time domain and frequency domain.The Wavelet Transform(WT) has been widely used so far,but there are some problems like how to select the wavelet function and so on.The recent popular analysis method,Hilbert-Huang Transform(HHT) is easy to use,and does not involve the concept of frequency resolution and the time resolution,so the HHT seems to have potential to become a perfect tool.Both the HHT and WT are used and compared for harmonic analysis in this paper.The comparison results have shown that,the HHT has better computing efficiency,and has better resolution both in time domain and in frequency domain,but the problems of swings at ends of signal and ripple phenomenon in its estimated frequency should be solved.更多还原