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In this paper, a modified Smith predictor control scheme is proposed for periodic disturbance rejection in both stable and unstable processes with time delay. Without affecting the superior setpoint response of Smith predictor control, the regulation performance under periodic disturbance can be enhanced significantly by the proposed design. Meanwhile, the asymptotical rejection for non-periodic disturbance...
In this paper, a modified virtual feedforward control (VFC), is presented for asymptotic disturbance rejection. The proposed VFC control is able to reject the periodic disturbances efficiently in nonminimum phase processes, and has been extended from SISO application to MIMO cases. The robustness of this control scheme is analyzed. The effectiveness is sustained by simulation.
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