Improved predictive control approach to networked control systems

Abstract

A predictive control-based approach is proposed to networked control systems. In this approach, an improved predictive controller is designed using delayed sensing data and a compensation scheme is proposed to overcome the negative effects of the network-induced delays and data packet dropouts in both the forward and backward channels. The proposed approach is easy to be implemented in practice compared with previous results in that only delayed data of the control inputs are used to derive the forward control predictions. The stability of the closed-loop system is obtained by modelling the system as a time delay system with structural uncertainties. Simulations show that the proposed approach is superior to the previous results in the situation where only delayed data are used.

Packetized Predictive Control of Stochastic Systems Over Bit-Rate Limited Channels With Packet Loss

“…Lemma 1 stated below gives a necessary condition for MSS (see Definition 2) of MJLS's of the form (15). It gives a bound on the packet dropout-rate which only depends on the plant model (1) and not on how the control packet u k is designed.…”

“…The stability characterizations of Section IV-B are applicable to any packetized NCS which can be described by (15) and (16), where Γ, Ψ and M are arbitrary matrices of appropriate dimensions. We will next derive more specific results.…”

“…By conditioning upon the dropout process d k , Equation (15) provides that the cross-covariance function of the processes ν k and θ k is given by:…”

Modeling of Random Delays in Networked Control Systems

“…The latter compensates for the random network delay by choosing the latest control value from the control prediction sequences available on the plant side. In practice, predictive control has been applied into networked Hammerstein systems [48] and networked Wiener systems [49].…”

Exponential Stability Control for Networked Systems With Interval Distribution Time Delays

“…The problem of the stabilization of NCSs with packet dropout [8]. A networked predictive control method for networked systems with stochastic delay and data dropout is proposed in to compensate the networked-induced delay [9][10]. This paper considers the problem of mean-square exponential stability control for a class of networked control systems with interval distribution time delay.…”