Stable observer-based control for long network-induced delays

Abstract

With regards to the characteristics of uncertain long delay of networked control system (NCS), the stochastic time-delay system can be transformed to a deterministic delay system by placing proper quantities of buffers at the nodes of the double-end networked control systems. An observer-based control design subject to fixed time delay is proposed to construct the augmented state-space model. Based on the Lyapunov function and linear matrix inequality (LMI) theorem, sufficient and necessary conditions for stability of such systems using static state feedback are given. Simulation result proves its effectiveness.

Robust optimal estimation over networks: Application to battery state of charge estimation

“…The corresponding delay compensation algorithm was based on a deterministic state estimator. In , similar delay maximizing strategies were presented to deal with sensor‐to‐estimator measurement feedback signals with a buffer or ‘waiting’ scheme. As its name implies, assuming that there is a maximal value of time delay, this maximal‐delayed data packet is guaranteed to arrive at the estimator.…”

“…Research work on network‐faced state estimation has gone through several phases: first of all, a deterministic model , secondly, stochastic measurement feedback or network modeling , and today, robust design to conquer network‐induced issues . With the change of different network environments and new required performance demands, these techniques corresponding to the previously mentioned phases have been developed up to now.…”

“…Such a method has also been proposed by Jin and Xue . Compared with the deterministic state estimation method , the results in show that a bounded error covariance is achieved and optimized with respect to the stochastic packet arrival process. It is suitable for the situation where statistical properties of packet transmission are collected.…”