Application of HHT Method for Analysis of Fault Signal in Electric Power System
Li Tianyun Zhao Yan Ji Xiaohui Li Nan (Northeast of China Electric Power Institute Jilin 132012 China)
In this paper, Hilbert-Huang Transform is applied to analyze fault transient signal in electric power system. The complicated signal can be decomposed into a finite Intrinsic Mode Functions (IMF) by the empirical mode decomposition (EMD), that make the Instantaneous frequency meaningful. Thus fault transient signal can be analyzed by Instantaneous frequency and Hilbert marginal spectrum. The result of simulation shows that this method can analyze the signal from time and frequency domains, and detect fault time and extract and distinguish harmonics. Compared with Fourier spectrum, Hilbert marginal spectrum has higher resolution in frequency domain.
【CateGory Index】： TM711