【摘要】 将一种新的瞬时频率估计方法—基于经验模式分解(Empirical Mode Decomposition,简称EMD)的信号瞬时频率分析方法,应用于电力系统的信号分析中。它是通过EMD方法提取非平稳信号的本征模态函数(Intrinsic Mode Function,简称IMF),再进行Hilbert变换即可得到各信号分量的瞬时频率,对其进行分析即可检测到信号发生故障和扰动的准确时刻。此方法从根本上摆脱了傅立叶分析的局限性,通过仿真,验证了此方法的有效性。更多还原

【Abstract】 Instantaneous frequency based on EMD,a new method is applied to analyze transient signal in eletric power systems.The signal is decomposed into intrinsic mode function by EMD.Then instantaneous frequency are obtained from it.Thus the time of the disturbances caused by fault can be detected accurately through them.The method gets rid of localization of Fourier transform radically.The validity is confirmed by emluator.更多还原