Title :
An adaptive notch filter for frequency estimation of a periodic signal
Author :
Mojiri, M. ; Bakhshai, A.R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Isfahan Univ. of Technol., Iran
Abstract :
Online frequency estimation of a pure sinusoidal signal is a classical problem that has many practical applications. Recently an ANF with global convergence property has been developed for this purpose. There exist some practical applications in which signals are not pure sinusoidal and contain harmonics. Therefore, online frequency estimation of periodic but not necessarily sinusoidal signals espoused by such applications becomes quite important. This note presents an alternative stability analysis for a modified ANF that permits the presence of harmonics in the incoming signal. Also, this stability analysis is simpler and alleviates the problem complexity even in the case of pure sinusoidal signal. Simulation results confirm theoretical issues.
Keywords :
adaptive filters; convergence; frequency estimation; harmonic analysis; notch filters; stability; adaptive notch filter; averaging theory; global convergence property; harmonics; online frequency estimation; periodic signal; pure sinusoidal signal; stability analysis; Adaptive filters; Amplitude estimation; Asymptotic stability; Convergence; Filtering theory; Frequency estimation; Power harmonic filters; Power system harmonics; Power system stability; Stability analysis;
Journal_Title :
Automatic Control, IEEE Transactions on
DOI :
10.1109/TAC.2003.821414