Title: Inverse plant model and frequency loop shaping-based PID controller design for processes with time-delay

Authors: Sudipta Chakraborty; Asim K. Naskar; Sandip Ghosh

Addresses: Department of Electrical and Electronics Engineering, Silicon Institute of Technology, Bhubaneswar, India ' Department of Electrical Engineering, National Institute of Technology, Rourkela, India ' Department of Electrical Engineering, Indian Institute of Technology, BHU, India

Abstract: To achieve satisfactory set-point tracking and load disturbance rejection, two approaches for PID controller design is presented in this paper. With a PD type controller, conventional IMC techniques fail to provide a satisfactory regulatory response for integrating processes and use of an integral action may lead to a large overshoot in servo response. To address this issue, a modified IMC structure with a second compensation for integrating processes is proposed to achieve desired servo as well as regulatory responses. Next, a frequency loop-shaping based design is proposed and the guidelines for choosing the desired loop-shape are also presented. To obtain the controller parameters in frequency loop-shaping framework, the optimisation problem is solved with primal-dual interior point method. To demonstrate the effectiveness of the proposed controllers, simulation comparisons with some recently developed methods are included. Moreover, the proposed method is experimentally validated on a temperature control process.

Keywords: internal model control; IMC; integrating processes; time-delay; inverse plant model; frequency loop shaping; FLS.

DOI: 10.1504/IJAAC.2020.108273

International Journal of Automation and Control, 2020 Vol.14 No.4, pp.399 - 422

Received: 11 Jun 2018
Accepted: 20 Dec 2018
Published online: 08 Jul 2020 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article