Controlling industrial dead-time systems: When to use a PID or an advanced controller

LR da Silva, RCC Flesch, JE Normey-Rico - ISA transactions, 2020 - Elsevier
This work presents a comparative analysis of PID, DTC and MPC strategies when used to
control SISO processes with dead time considering characteristics commonly found in …

Improved cascade control structure for enhanced performance

I Kaya, N Tan, DP Atherton - Journal of Process Control, 2007 - Elsevier
In conventional single feedback control, the corrective action for disturbances does not
begin until the controlled variable deviates from the set point. In this case, a cascade control …

Smith predictor controller design using the direct synthesis method for unstable second-order and time-delay systems

Y İçmez, MS Can - Processes, 2023 - mdpi.com
Industrial processes often involve a long time delay, which adversely affects the stability of
closed-loop control systems. The traditional Smith Predictor (SP) is a model-based controller …

Two degree of freedom control scheme for unstable processes with small time delay

M Ajmeri, A Ali - ISA transactions, 2015 - Elsevier
In this work, a recently reported two degree of freedom control structure namely the Parallel
Control Structure (PCS) is modified to achieve improved control performance for unstable …

Design of an optimal fractional fuzzy gain-scheduled Smith Predictor for a time-delay process with experimental application

NS Özbek, I Eker - ISA transactions, 2020 - Elsevier
This study addresses an experimental investigation of a novel modified Smith Predictor (SP)
based fractional fuzzy gain-scheduled control scheme in control of a time-delayed thermal …

All-PD control of pure integrating plus time-delay processes with gain and phase-margin specifications

S Chakraborty, S Ghosh, AK Naskar - ISA transactions, 2017 - Elsevier
It is well known that PD controller, though yields good servo response, fails to provide
satisfactory regulatory response for Integrating Plus Time-Delay (IPTD) processes. On the …

A refinement procedure for PID controllers

I Kaya, N Tan, DP Atherton - Electrical Engineering, 2006 - Springer
Abstract Proportional-Integral-Derivative (PID) controllers are still extensively used in
industrial systems. In the literature, many publications can be found considering PID …

Use of Smith predictor in the outer loop for cascaded control of unstable and integrating processes

İ Kaya, DP Atherton - Industrial & engineering chemistry research, 2008 - ACS Publications
Cascade control is an alternative to conventional single feedback control to improve the
performance of a control system, particularly in the presence of disturbances. However, to …

Integral criteria for optimal tuning of PI/PID controllers for integrating processes

A Ali, S Majhi - Asian Journal of Control, 2011 - Wiley Online Library
Tuning formulas for PI/PID controllers for integrating processes are presented in this paper.
The controller parameters are obtained by minimizing various integral performance index …

Analytical design of modified Smith predictor for unstable second-order processes with time delay

M Ajmeri, A Ali - International Journal of Systems Science, 2017 - Taylor & Francis
In this paper, a modified Smith predictor using three controllers, namely, stabilising (Gc), set-
point tracking (Gc 1), and load disturbance rejection (Gc 2) controllers is proposed for …