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A novel equilibrium optimized double-loop control scheme for unstable and integrating chemical processes involving dead time

  • Pulakraj Aryan and G. Lloyds Raja ORCID logo EMAIL logo
Published/Copyright: June 14, 2022
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 20 Issue 12

Abstract

Integrating and unstable chemical processes showcase instability in open-loop configuration due to the existence of poles at the origin and right-half of the s-plane. They present challenging control requirements due to their non-self-regulating nature. The presence of dead time demands more sophisticated control requirements for the above-mentioned processes. So double-loop control strategies are preferred over PID controllers in single-loop configuration. In this work, a novel IMC-PD double-loop control strategy is proposed for unstable and integrating plants with dead time. The inner-loop consists of PD controller whose initial settings are derived using Routh–Hurwitz stability conditions. The outer-loop consists of an IMC controller whose parameter along with that of the PD controller is optimized using the metaheuristic algorithm called equilibrium optimizer algorithm (EOA). EOA utilizes the range of controller settings from RH criteria for stable operation and provides the optimal settings by minimizing the integral square error (ISE). Merits of the suggested strategy is illustrated with the help of benchmark plant models of unstable/integrating chemical processes and that of a bioreactor. By computing quantitative performance measures, the dynamic responses resulting from the proposed control scheme is found to be more effective than the reported works.

Keywords: dead time; equilibrium optimizer; integral square error; integrating and unstable chemical processes; internal model control; optimal double-loop control
Corresponding author: G. Lloyds Raja, Electrical Engineering Department, National Institute of Technology Patna, Ashok Rajpath, Patna 800005, Bihar, India, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-01-15
Accepted: 2022-05-26
Published Online: 2022-06-14

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijcre-2022-0007
Keywords for this article
dead time; equilibrium optimizer; integral square error; integrating and unstable chemical processes; internal model control; optimal double-loop control

Articles in the same Issue

  1. Frontmatter
  2. Articles
  3. Performance of Pd catalyst supported on trimetallic nanohybrid Zr–Al–La in hydrogenation of ethylanthraquinone
  4. Enhanced degradation of Rhodamine B dye by Fenton/peracetic acid and photo-Fenton/peracetic acid processes
  5. Optimization of electrocoagulation process for treatment of rice grain-based biodigester distillery effluent using surface response methodology approach
  6. Numerical simulation of collision removal of inclusion in swirling flow tundish
  7. Fabrication of superhydrophobic and flame-retardant polyethylene terephthalate fabric through a fluorine-free layer-by-layer technique
  8. Investigation on the atomization characteristics and structure parameters of alcohol-based fuel in small stove
  9. Metal-exchanged phosphotungstate nanoparticles with improved acidity as the catalyst for esterification of glycerol with acetic acid
  10. Synergistic effects of hierarchical porous structure, acidity and nickel metal for hydro-liquefaction of thermal extracts from lignite over Ni/ZSM-5
  11. A novel equilibrium optimized double-loop control scheme for unstable and integrating chemical processes involving dead time
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