摘要
基于能够精确提取频率分量的希尔伯特-黄变换HHT,对电力系统中的次同步谐振SSR进行了检测分析。首先采用小波滤除基频以上的高次谐波,然后通过HHT中的经验模态分解EM D实现SSR模态分量的有效分离,最后对各分量进行希尔伯特(H ilbert)变换,计算其相应瞬时幅值和瞬时频率。结果表明,与以往文献所用方法相比,该方法可以更加精确地提取SSR的模态参数,有助于分析电力系统的SSR模态及阻尼控制器的设计研究。
Based on Hilbert-Huang transform （HHT）, which can extract frequencies precisely, this paper present a method to detect and analyze the sub-synchronous resonance （SSR） in power system. This method use Wavelet to eliminate ultra-harmonics above basic frequency. Then extract subsynehronous frequencies by empirical mode decomposition （EMD）. Finally get the value of amplitude and frequency of each mode components. The result of emulation shows that this method can extract signal characteristics more precisely comparing with previous methods, which may help in analyzing subsynchronous resonance mode of power systems and designing and research of damping controller.
出处
《吉林电力》
2009年第3期20-23,共4页
Jilin Electric Power
关键词
次同步谐振
希尔伯特-黄变换
经验模态分解
suhsynchronous resonance （SSR）
Hilbert-Huang transform （HHT）
empirical mode decomposition （EMD）
