Stability and H_inf Performance Preserving Scheduling Policy for Networked Control Systems

Hai Lin, Guisheng Zhai, Lei Fang, and Panos J.Antsaklis

Proc. of the 16th IFAC World Congress
Prague, Czech Republic, July 4-8 2005

Abstract—In this paper, the exponential stability and the L_2 induced gain performance are investigated for a collection of plants whose feedback control loops are closed via a shared network link. Due to a limited communication capacity, the network link can only close one feedback control loop at a time, while the other control loops are assumed to be open-loop. Therefore, it is necessary to carefully allocate the communication resources in order to guarantee exponential stability and achieve desired H_inf performance of the whole networked control systems. In this paper, we derive a condition for scheduling the network so that all the plants achieve the exponential stability and some reasonable H_inf disturbance attenuation levels. The proof is constructive. A time-division based scheduling policy is proposed to guarantee the exponential stability and a weighted H_inf performance. The techniques used in this paper are based on the average dwell time approach incorporated with piecewise quadratic Lyapunov-like functions.

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