H∞ performance optimization for networked control systems with multiple sensors and actuators

This paper is concerned with the problem of H∞ performance optimization for NCSs with multiple sensors and actuators. The controller, sensors, and actuators employ a periodic time sequencing scheme for message transmissions, and the switched controller gains will introduce less conservatism than the common controller gain based method. By choosing appropriate Lyapunov function, sufficient conditions guaranteeing the H∞ performance of the considered system are presented, and a new switched controller design method is also proposed. The merit of the proposed optimization method lies in its less conservatism, which is achieved by adopting periodic time sequencing scheme for controller and proposing new switched controller design method. The results are also extended to NCSs with norm-bounded parameter uncertainties. The simulation results illustrate the effectiveness of the periodic time sequencing scheme for sensors, actuators and controller.

1 INTRODUCTION

Networked control systems (NCSs) are control systems in which controller and plant are connected via a communication channel. The defining feature of an NCS is that information (reference input, plant output, control input etc.) is exchanged using a network among control system components (sensors, controller, actuators, etc.). The introduction of communication network will lead to many advantages, however, it will inevitably lead to time delay, packet dropout, communication constraints, etc., which should be taken into full consideration in NCSs design.