Robust tuning of a generalized predictor-based controller for integrating and unstable systems with long time-delay

Abstract

ElsevierGarcía Gil, PJ.; Albertos Pérez, P. (2013) In this work, a general structure to control long time-delay plants is proposed and an easy methodology to tune the control parameters is outlined. All the sensitivity transfer functions are delay free. The proposed scheme is equivalent to the Smith Predictor but able to cope with any kind of systems, including non-minimum phase, unstable and integrating plants. The controllers are designed based on the delay free model. Contrary to other approaches, other than for the digital implementation, no delay approximation is used. A tuning parameter is provided in order to reach an intuitive tradeo between performance and robust stability. A comparative analysis with respect to recently successful proposals shows a substantial improvement in the performance/robustness tradeo as well as in the tuning process.

Analytical design of a generalised predictor‐based control scheme for low‐order integrating and unstable systems with long time delay

“…The main controllers, f ( ) K z and ( ) K z , however, were not specifically designed in the references 35,36 , and no performance specifications or stability constraints were studied for engineering applications. To address these issues and obtain improved control performance, analytical designs for these two controllers will be proposed in the following sections.…”

“…To assess control performance, the commonly used performance index of integral-absolute-error (IAE) of process output is adopted which should be as small as possible. as done in the reference 36 , i.e.…”

“…In the recent papers 35,36 , a generalized predictor (GP) structure was developed to control stable, integrating or unstable processes with long time delay. The proposed GP is equivalent to the SP but can be applied to integrating and/or unstable systems.…”

“…The control results compared with the references 26,36 are shown in Figure 14 along with the corresponding IAE indices listed in Tables 2 and 3. It is seen that given the similar set-point response, improved disturbance rejection performance is obtained by the proposed method.…”

Predictor-Based Disturbance Rejection Control for Sampled Systems With Input Delay

“…[1,2], which may provoke performance deterioration even instability of the control system, in particular for the presence of input delay, or equivalently, delayed output response [3]. Hence, control of industrial systems with time delay, especially for input delay, has attracted considerable attentions in the recent years [4][5][6][7][8][9]. It has been well known that the conventional PID controller could This work is supported in part by the NSF China Grants 61633006 and 61473054, and the National Thousand Talents Program of China.…”