Voltage flicker detection based on independent component analysis
Yang Hong-geng · Dianli zidonghua shebei · 2007
ICA(Independent Component Analysis) separates and restores signal by using the high-order statistics of that signal.A method of voltage flicker detection using synchronous filtering and ICA is proposed.The multiplicative result of envelope signal and power voltage is transformed into the signal combination of envelope signal and DSB(Double Side Band) modulated signal with 100 Hz as its central frequency.With fixed-point Fast-ICA algorithm,BSS(Blind Source Separation) is then carried out according to the independency principle of maximizing Negentropy.The amplitude of the separated envelop signal is revised to obtain the estimation of real signal.Simulation results show that,this method separates the envelop signal from steady or unsteady voltage flicker with higher precision of frequency and amplitude detection.