Automatica, Vol.103, 346-353, 2019
L-1 adaptive sampled-data control for uncertain multi-input multi-output systems
This paper develops a sampled-data (SD) controller for uncertain multi-input multi-output (MIMO) systems, possibly with non-minimum phase zeros, using the L-1 adaptive control architecture. The proposed controller compensates for disturbances and uncertainties within the bandwidth of a low-pass filter. Sufficient conditions for robust stability are obtained for the closed-loop system with SD controller, where the input/output signals are held constant over a sampling period. It is shown that the hybrid closed-loop system can recover the performance of a continuous-time reference system as the sampling time of the SD controller tends to zero. Simulation examples are provided to validate the theoretical findings. (C) 2019 Elsevier Ltd. All rights reserved.
Keywords:Multi-input multi-output system;L-1 adaptive sampled-data control;Output-feedback;Disturbance compensation;Digital controller;Non-minimum-phase system