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Explicit model-based real PID tuning for efficient load disturbance rejection

Authors:

Alberto Leva , Alessandro Papadopoulos, Silvano Seva , Chiara Cimino

Publication Type:

Journal article

Venue:

Industrial & Engineering Chemistry Research

DOI:

10.1021/acs.iecr.9b04198


Abstract

In process control, many PID loops are primarily devoted to rejecting load disturbances, and some of them are crucial for the quality of the overall plant operation. In such a emph{scenario}, automatic tuning is highly desired. However, load disturbance rejection calls for strong feedback up to quite high frequencies with respect to the dominant plant dynamics, on which most tuning rules are centred. As such it is difficult for a rule to yield good and, above all, emph{uniform} results in the face of all the various process structures it can be confronted with. In this paper we propose an explicit model-based PID tuning rule specifically targeted at the problem just evidenced. The rule minimises the magnitude of the nominal disturbance-to-output frequency response, at the same time preventing that magnitude to exhibit a peak or a emph{plateau} around its maximum. This characteristic, together with tuning the PID derivative filter, leads to sharp disturbance rejection without incurring in an excessive control sensitivity to high-frequency measurement noise, and mitigates the problems caused by heterogeneous process dynamics. The proposed approach is assessed by comparing the rule with selected counterparts, on a literature benchmark with different process structures. A laboratory experiment is finally presented, to show that our rule can withstand real-world operating conditions.

Bibtex

@article{Leva5703,
author = {Alberto Leva and Alessandro Papadopoulos and Silvano Seva and Chiara Cimino},
title = {Explicit model-based real PID tuning for efficient load disturbance rejection},
volume = {58},
number = {9},
pages = {23211--23224},
month = {December},
year = {2019},
journal = {Industrial {\&} Engineering Chemistry Research},
url = {http://www.es.mdu.se/publications/5703-}
}