A novel algorithm for phasor calculation based on wavelet analysis [power system analysis]

A novel discrete wavelet transform (DWT) approach to the computation of synchronized phasors is presented in this paper. Under steady state, the error in the phasor obtained by the proposed algorithm is very small, i.e. 0.001 p.u. in magnitude error and 0.05/spl deg/ in angle error. During transients and considering frequency deviation, the performance of the proposed algorithm is far higher than that in FFT.

I. INTRODUCTION

From the DWT powerful property point of view, many researchers [1] predict that DWT is a useful tool for calculating phasor. Unlike FFT, there is no strict relationship between frequency domain and time domain in DWT, what can be obtained from DWT is two sets of coefficients that present the details and approximations of the original signal respectively. It is difficult to obtain phasor directly by using those coefficients, this paper proposes a novel DWT algorithm to compute synchronized phasor.