Characteristics of Power Series Type Wavelet Transform for Online Frequency Estimation

A new approach to estimate the power system frequency and signal components using wavelet transform is proposed in this paper. The wavelet function is expressed by the power series and is able to be performed by the z-transform, which can shorten the estimating time of the signal frequency compared with the general convolution integral. The fundamental frequency (60Hz) or the harmonics frequency (300Hz) of the signal is quickly estimated and components of signal are extracted by the proposed method. The online estimation by the proposed method is successfully achieved in the experiment using the DSP system. And the characteristics of the estimation method by the parameter changes are confirmed.