CRONE Control: Principles and Extension to Time-Variant Plants with Asymptotically Constant Coefficients

The principles of CRONE control, a frequency-domain robust control designmethodology based on fractional differentiation, are presented.Continuous time-variant plants with asymptotically constant coefficientsare analysed in the frequency domain, through their representation usingtime-variant frequency responses. A stability theorem for feedbacksystems including time-variant plants with asymptotically constantcoefficients is proposed. Finally, CRONE control is extended to robustcontrol of these plants.