摘要
鉴于现有电力系统谐波检测与分析方法的不足,用希尔伯特-黄变换(HHT)进行谐波分析。该方法由两部分组成。首先对谐波信号作经验模态(EMD)分解,得到满足一定条件的固有模态信号(IMF),然后用希尔伯特变换求其瞬时频率和瞬时幅值。该方法适用于非线性非平稳信号的分析,具有概念清晰、计算简单的优点。仿真研究表明,用HHT方法进行电力系统谐波分析是可行的,与傅立叶变换和小波变换等现有方法比较,有很多独特的优点。
Because of the drawback in existing methods of harmonic detection of power system, Hilbert- Huang Transform is applied to detect the harmonic signal. HHT is composed of two sections. At first the harmonic signal is decomposed by the EMD method, the intrinsic mode function IMFs setisfieding specific requirements are obtained. Then the instantaneous frequency and amplitude are computed by the hilbert transform. The method is suitable for analysis of nonlinear and nonstationary signals, has advantages of distinct concept and is easy to use. Simulations show that the HHT-based method is practicable for harmonic analysis of power system, and has many distinctive advantages over fourier transform and wavelet transform.
出处
《江苏工业学院学报》
2007年第3期58-61,共4页
Journal of Jiangsu Polytechnic University
基金
江苏省教育厅自然科学基金项目(06KJD470051)
