Control and Systems Engineering, Electrical and Electronic Engineering
5
Scopus Publications
Scopus Publications
Maximum sensitivity-based PID controller cascaded with 2/3 order filter for integrating processes with time delay K. Divakar, Muni Reddy G., N.M.G. Kumar, M. Ijaz Khan Results in Control and Optimization, 2025 In the chemical industry, integrating processes are often encountered. Examples of integrating processes include bottom level control of a distillation column, level control of a tank with a motor fixed at the outlet, current-controlled DC motor, fermentation reactors, spacecraft take-off dynamics, paper industry drying processes, continuous stirred tank reactor (CSTR) with exothermic reactor, and so on. This article describes a new PID controller with a 2/3 order filter for integrating processes with time delay. Time delay is approximated to ratio of two polynomials using a second-order Pade’s approximation. A set point filter is used to minimize overshoot and the settling time of servo responses. Simulation studies are conducted on some of the benchmarking process models utilized in the literature. The comparative assessment is based on various performance indices.
A Technical Review on IMC-PID Design for Integrating Process with Dead Time K. Divakar, M. Praveen Kumar, C. Dhanamjayulu, G. Gokulakrishnan IEEE Access, 2024 The demeanour of many chemical and non-chemical processes resemble that of an integrating process. Developing a control plan for an integrating process is complicated, and the difficulty becomes even more when dead time is present. Internal Model Control (IMC) is enthralling in the creation of control strategies because it can derive the controller in the framework of a Proportional-Integral-Derivative controller (PID). It has been noted that when a filter is added to a controller, its performance improves, and various researchers have proposed PID with filter. The current work presents a comprehensive review of existing IMC-PID controllers for controlling integrating processes with dead time. The filter postulation in IMC is discussed, which is responsible for generating several forms of PID for the same process. Performance is measured using a variety of conventional performance indices. This article provides an overview of IMC filter topologies used in IMC-PID tuning for various integrating processes, including tuning relations and time delay approximations. The paper has also highlighted the guidelines for the selection of IMC filter and different structures of IMC filters from conventional to fractional order.
A Novel PID Controller Augmented with 2/3 Order Filter for Stable and Integrating Processes with Dead Time Divakar Kuruna, Praveen Kumar, B Vanavil, A Anusha, M Perumalsamy, et al. International Journal of Intelligent Engineering and Systems, 2023 The Effective control of integrating processes with dead time is always a challenging task.Many researchers have addressed this by proportional-integral-derivative (PID) controllers derived through various procedures such as internal model control (IMC), Direct synthesis etc.This paper presents the design of PID controller associated with a 2/3 order filter for integrating processes with dead time.In this study, a polynomial technique is used to obtain the PID parameters and filter coefficients.The maximum sensitivity (MS) criteria is utilized for the selection of the tuning parameter.Second-order Pade's approximation is utilized for dead time approximation.To bring down the overshoot and obtain faster settling time of servo response, a set point filter is employed.The set point filter provides manipulation of servo response without altering regulatory performance.Simulation studies are carried out on some of the bench marking process models used in the literature.The developed control design provides ameliorated closedloop performance, particularly in terms of disturbance rejection.The proposed controller is relatively robust which is evidenced by performance metrics.
A Novel PID Controller Cascaded With Higher Order Filter for FOPDT With Real Time Implementation Kuruna Divakar, M. Praveen Kumar IEEE Access, 2022 This work describes the design of Proportional-Integral-Derivative(PID) controller for stable and unstable First Order Processes with Dead Time(FOPDT). PID controller is augmented with a higher order filter. The PID and the filter parameters are analytically derived using polynomial method. Higher order time delay approximation has been considered for improved accuracy. Maximum sensitivity(MS) based analytical tuning procedure is presented and concrete tuning guidelines are derived. The suggested technique is validated against delay dominant and nonlinear processes. In terms of the various performance indices, the suggested technique is compared to existing methodologies. The proposed method is tested on a real time process to verify the practical application.
A Novel Efficacious PID Controller for Processes with Inverse Response and Time Delay Kuruna Divakar, M. Praveen Kumar IEEE Access, 2022 Design of controller for the inverse response processes has been a challenge for researchers. Water level control in a steam boiler is one of the best examples, where the time delay and inverse response are inherent. Proportional Integral Derivative(PID) controller is the extensively employed regulator in industries. The present work introduces a new form of PID for the processes which are having time delay and inverse response simultaneously. The proposed PID is associated with a higher order filter. The controller and filter parameters are computed by using polynomial approach. Maximum sensitivity of the control loop is used to determine the tuning parameter. A set-point filter is utilized to diminish the settling time and overshoot in servo response. The suggested method is evaluated by considering several performance indices and bench marking examples. The proposed method is evaluated against the existing methods and tested in real-time scenario also.
