“…To extract harmonics in the presence of noise and to estimate parameters of harmonics, such as amplitudes and phases, various harmonic estimation methods have been proposed in a number of research papers that include fast Fourier transform (FFT) [1], shorttime Fourier transform (STFT) [2,3], discrete wavelet transform (DWT) [4] and wavelet packet transform (WPT) [5], recursive least squares (RLS) [6][7][8], least mean squares (LMS) [9,10], Newton methods [11] and Kalman filters (KFs) [12,13]. Although these techniques show very good results in harmonic estimation, they have their weakness.…”