Robust stability of networked control systems with dynamic controllers in the feedback loop

The study of networked control systems (NCS) stability has experienced rapid development thanks to recent contributions. However, in most cases, results only concern a special type of feedback structure, namely static state feedback controllers. Such controllers constitute a particular case of dynamic controllers - a much broader class of feedback compensation - which are, in fact, the most widespread controllers found in industrial and practical applications. Thus, encompassing dynamic controllers is an important step to ensure NCS theory reaches real-world practice. This paper addresses the stability of NCSs with dynamic controllers where the system is subject to model uncertainties. The novel robust stability criterion presented outperforms previous results regarding dynamic controllers when particularized to the case without model uncertainty with substantially less computational effort, as the provided numerical examples illustrate.