A Method to Recognize Power System Instantaneous Voltage Distortion Signal Based on Independent Component Analysis
Wu Jiekang · Power System Technology · 2009
Based on independent component analysis(ICA),a method to detect and recognize instantaneous power quality distortion signal is proposed.By use of the property that ICA can separate mutual-independent source signals from their linear mixture,in the proposed method the negative entropy is served as the objective function to evaluate the independence of signals,and through optimizing the objective function a fixed-point algorithm,namely FastICA,is derived by which the power network voltage signals containing instantaneous power quality disturbance signals are calculated,and the signals corresponding to the disturbance can be separated.For different types of disturbances,the proposed method can detect and recognize various instantaneous voltage distortion signals effectively such as instantaneous voltage sag,instantaneous voltage swell,instantaneous voltage impulse,instantaneous voltage interruption,harmonics and so on.