Adaptive algorithms for the rejection of sinusoidal disturbances with unknown frequency
Automatica (Journal of IFAC)
A method of extraction of nonstationary sinusoids
Signal Processing
Paper: The internal model principle of control theory
Automatica (Journal of IFAC)
Brief paper: Unbiased estimation of a sinusoid in colored noise via adapted notch filters
Automatica (Journal of IFAC)
Rejection of harmonic disturbances at the controller input via hybrid adaptive external models
Automatica (Journal of IFAC)
Design of an extended Kalman filter frequency tracker
IEEE Transactions on Signal Processing
A nonlinear time-frequency analysis method
IEEE Transactions on Signal Processing
Periodic disturbance cancellation with uncertain frequency
Automatica (Journal of IFAC)
| Hi-index | 35.68 |
This paper is concerned with the robust rejection of harmonic disturbances with unknown frequency and amplitude affecting uncertain linear system. The developed control scheme combines the properties of adaptive feedforward cancellation (AFC) techniques with the phase and frequency detection capabilities provided by a nonlinear frequency estimation algorithm. Under mild assumptions on the nominal model of the system to be controlled, the proposed scheme is proven to achieve the complete rejection of harmonic disturbances at the input or at the output of the system. A detailed stability analysis based on averaging provides useful informations on the effect of the tuning parameters over the convergence of the estimator. The effectiveness of the proposed approach is demonstrated by a two-time scale averaging analysis.