Pre-stabilised Predictive Functional Control for Open-loop Unstable Dynamic Systems. Issue 6 (2021)

• Record Type: Journal Article
• Authors: Aftab, Muhammad Saleheen; Rossiter, John Anthony
• Is Part Of: IFAC-PapersOnLine. Volume 54:Issue 6(2021)
• Page Start: 147
• Page End: 152
• Publication Date: 2021
• Subjects: PFC -- coincidence point -- feedback compensation -- pre-stabilisation; Automatic control -- Periodicals; 629.805
• DOI: 10.1016/j.ifacol.2021.08.537
• Languages: English
• ISSNs: 2405-8963

Abstract

Abstract: Predictive functional control (PFC) is the simplest model-based algorithm, equipped with the attributes of a fully fledged predictive controller but at the cost and complexity threshold of a standard PID regulator. It has proven benefits in controlling stable SISO dynamic systems, but similarly to its competitor PID, it loses efficacy when a challenging application is introduced. In this paper, we present a modified PFC approach, especially tailored for open-loop unstable processes, using pre-stabilisation to efficiently control the undesirable dynamics at hand. This is essentially a two-stage design scheme with implications for PFC tuning and constraint handling. The proposal, nevertheless, is straightforward and intuitive, and provides improved closed-loop control in the presence of external perturbations against the standard PFC, and significantly better performance overall compared to the common PID algorithm, as demonstrated in a numerical case-study.