Abstract
The emergence and integration of communication technologies in industrial control systems has created new requirements in terms of stability, performance and robustness that should be met to deal with the effects of network-induced delays. In this paper, the analytical design of a networked cascade control system exposed to communication delay and data dropout is investigated. First, an appropriate augmented continuous-time state-space model is proposed. Then, a mathematical approach is introduced to implement the augmented Lyapunov-Krasovskii functional and free-weighting matrix technique for the stability analysis purpose. The augmented representation simplifies the stability analysis of these systems significantly and makes it possible to correlate different variables in Lyapunov functional, which causes a remarkable improvement in H ∞ performance. Numerical simulations are presented to validate the feasibility and performance of the proposed approach. The obtained results indicate achieving much higher allowable delay bounds and robustness against disturbances.
Published Version
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