Abstract: | After voltage flicker signal, which modulated by low-magnitude single frequency signal or multi-frequency complex signal, is decomposed, it is characterized by symmetrical distribution on both sides of the frequency in the frequency domain, taking the frequency-band of actual modulated signals into account, a novel method is developed to realize the purpose of modulating the voltage flicker signal in frequency domain and keep down the low-frequency parts, which named as modulated flicker signal, the parameters of low-magnitude modulated signal can be extracted by the formulas deduced after the parameters of modulated flicker signal extracted by the Hilbert-Huang Transform. The simulation and example indicate that the method can extract the parameters of low-magnitude modulated signal from voltage flicker signal easily and effectively, and it is a new way to extract the parameters of low-magnitude modulated signal. |