A NEW METHOD FOR POWER QUALITY DETECTION BASED ON HHT
Zhao Yan · Proceedings of the CSEE · 2005
Hilbert-Huang Transform is introduced for detection and analysis of power quality disturbances (voltage sag and swell, voltage interruption, transient interruption and oscillation etc.) and harmonics (integer and non-integer harmonics). The method is composed of Empirical Mode Decomposition (EMD) and Hilbert Transform. The signal is decomposed into Intrinsic Mode Function (IMF) by the EMD method. Then amplitude and frequency of corresponding time can be detected accurately and quantitatively. It can detect time, amplitude and frequency of the power quality disturbances and also detect amplitude and frequency of harmonics by this method. Simulation results show that this method has good performance to analyze non-stationary and stationary signals.