Browse > Article
http://dx.doi.org/10.9713/kcer.2020.58.3.430

Development of Anti-windup Techniques for Cascade Control System  

Bae, Jeong Eun (School of Applied Chemical Engineering, Kyungpook National University)
Kim, Kyeong Hoon (School of Applied Chemical Engineering, Kyungpook National University)
Chu, Syng Chul (School of Applied Chemical Engineering, Kyungpook National University)
Heo, Jaepil (School of Applied Chemical Engineering, Kyungpook National University)
Lim, Sanghun (School of Applied Chemical Engineering, Kyungpook National University)
Sung, Su Whan (School of Applied Chemical Engineering, Kyungpook National University)
Publication Information
Korean Chemical Engineering Research / v.58, no.3, 2020 , pp. 430-437 More about this Journal
Abstract
In this research, the anti-windup techniques for the cascade control system are newly developed. Cascade control system has an additional internal feedback control loop to reject disturbances better than the conventional control system. Remarkable difference between the conventional single-loop control system and the cascade control system is the interaction that the controller output saturation of the secondary control loop strongly affects the integral action of the primary control loop. In industry, local back calculation anti-windup method has been mainly used for each controller without considering the interaction between the two controllers. But it cannot eliminate the integral-windup of the primary controller originated from the saturation of the secondary controller output. To solve the problem, the two anti-windup techniques of the cascade conditional integration and the cascade back calculation are proposed in this research by extending the local anti-windup techniques for the single-loop control system to the cascade control system. Simulation confirmed that the proposed methods can effectively remove the integral windup of the primary controller caused by the saturation of the secondary controller output and show good control performances for various types of processes and controllers. If the reliability of the proposed methods is proved through the applications to real processes in the future, they would highly contribute to improving the control performances of the cascade control system in industry.
Keywords
PID; Anti-windup; Cascade Control System; Conditional Integration; Back Calculation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Sung, S. W., Lee, J. and Lee, I. B., Process Identification and PID Control, John Wiley & Sons (2009).
2 Seborg, D. E., Mellichamp, D. A., Edgar, T. F. and Doyle III, F. J., Process Dynamics and Control, John Wiley & Sons(2010).
3 Berner, J., Hagglund, T., and Astrom, K. J., "Asymmetric Relay Autotuning - Practical Features for Industrial Use," Control Eng. Practice, 54, 231-245(2016).   DOI
4 Lee, J., Sung, S. W., Lee, F. Y., Baldea, M., and Edgar, T. F., "Full Closed-Loop Tests for the Relay Feedback Autotuning of Stable, Integrating, and Unstable Processes," ACS Omega, 4(20), 18760-18770(2019).   DOI
5 Park, B. E., Kim, K. H., Kang, H. S., Sung, S. W. and Lee, I. B., "Improved Relay Feedback Method Under Noisy and Disturbance Environments," J. Chem. Eng. Jpn., 52(5), 430-438(2019).   DOI
6 Nikita, S. and Lee, M., "Control of a Wastewater Treatment Plant Using Relay Auto-tuning," Korean J. Chem. Eng., 36(4), 505-512 (2019).   DOI
7 Morari, M. and Zafiriou, E., Robust Process Control, Prentice Hall(1989).
8 Jia, B., Mikalsen, R. Smallbone, A., Zuo, Z. and Feng, H., "Piston Motion Control of a Free-piston Engine Generator: A New Approach Using Cascade Control," Appl. Energy, 179, 1166-1175 (2016).   DOI
9 Astrom, K. J., and Hagglund, T., PID Controllers: Theory, Design, and Tuning, Instrument Society of America(1995).
10 Rehan, M., Ahmed, A. and Iqbal, N., "Static and Low Order Antiwindup Synthesis for Cascade Control Systems with Actuator Saturation: An Application to Temperature-based Process Control," ISA Trans., 49(3), 293-301(2010).   DOI
11 Mehdi, N., Rehan, M., Malik, F. M., Bhatti, A. I. and Tufail, M., "A Novel Anti-windup Framework for Cascade Control Systems: An Application to Underactuated Mechanical Systems," ISA Trans., 53(3), 802-815(2014).   DOI
12 Adegbege, A. A. and Heath, W. P., "A Framework for Multivariable Algebraic Loops in Linear Anti-windup Implementations," Automatica, 83, 81-90(2017).   DOI