Controller design on a new 2DOF PID structure for different processes having integrating nature for both the step and ramp type of signals

Abstract

Chemical reactors, heat exchangers, level-loops, and distillation columns are commonly encountered in the chemical process industry, and these are having a significant role in the functioning of any chemical process. For the smooth and efficient functioning of any such process, a robust control law design is an important work to be considered. In this paper, a modified 2DOF robust PID control law has been developed to ensure satisfactory performance in both the step and ramp type references and disturbances. Controller parameters are derived with Maximum sensitivity, Gain, and Phase margin specifications. Case studies with different chemical processes like CSTR, distillation column, heat exchangers, and boiler drum level-loop are included for both the nominal and perturbed cases. Lastly, a performance comparison of ISE (Integral of square error), ITAE (Integral time absolute error), IAE (Integral absolute error), and Total variation (TV) of the control signal is also included.

KEYWORDS:

• 2DOF PID control
• integrating processes
• maximum sensitivity
• gain and phase margin
• time-delay

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

Data sharing is not applicable to this article as no datasets were generated or analysed during the current study.

Additional information

Notes on contributors

Dipjyoti Das

Mr. Dipjyoti Das Obtained his B.Tech degree in Electronics and Instrumentation Engineering from National Institute of Technology Silchar, India in 2017. After which, he received his M.Tech degree from Sant Longowal Institute of Engineering and Technology, Punjab, India in 2020. Currently, he is pursuing his Ph.D in Electronics and Instrumentation Engineering from National Institute of Technology Silchar, India. His research area includes Process control, PID control. Email: [email protected]

Sudipta Chakraborty

Dr. Sudipta Chakraborty Obtained his B.Tech degree in Electronics and Instrumentation Engineering from WBUT, India in 2012. After which, he received his M.Tech degree from National Institute of Technology Rourkela, India in 2014. In 2018, he was awarded Ph.D. degree in Electrical Engineering from the same institute. He is currently working as an Assistant Professor in Department of Electronics and Instrumentation Engineering, National Institute of Technology Silchar, India. His research area includes Process control, PID control, Robust control, Time-delay systems, Fractional Order Control. Email: [email protected]

Asim Kumar Naskar

Dr. Asim Kumar Naskar Obtained his B.Tech degree in Electrical Engineering from Jadavpur University, India in 2001. After which, he received his M.Tech degree from the same Institute in 2006. In 2015, he was awarded with Ph.D. degree in Electrical Engineering from Indian Institute of Technology, Kharagpur, India. He is currently working as an Assistant Professor in the Department of Electrical Engineering, National Institute of Technology, Rourkela, India. His research area includes Robust Control, Control allocation. Email: [email protected]