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A ratio control scheme decoupling disturbance response from set-point response.

Linlin Ou1, Li Yu, Weidong Zhang

  • 1Department of Automation, Zhejiang University of Technology, Hangzhou 310032, PR China. linlinou@zjut.edu.cn

ISA Transactions
|May 22, 2007
PubMed
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A new ratio control scheme improves stable and unstable processes with time delay. This novel system decouples set-point and disturbance responses for easier tuning and better performance in industrial control applications.

Area of Science:

  • Process Control
  • Control Engineering
  • Industrial Automation

Background:

  • Traditional ratio control systems struggle with stable and unstable processes, especially those with time delays.
  • Decoupling set-point and disturbance responses is crucial for robust control performance.

Purpose of the Study:

  • To propose a novel ratio control scheme for processes with time delays.
  • To enhance ratio control performance by decoupling set-point and disturbance responses.
  • To provide an analytically designed, easily tunable control system.

Main Methods:

  • A two-degrees-of-freedom control structure with two control loops was employed.
  • Two distinct ratio controllers were introduced for set-point and load disturbance changes.
  • Analytical design methods were used for controller tuning.

Related Experiment Videos

Main Results:

  • The proposed scheme effectively decouples set-point and disturbance responses.
  • Independent and convenient tuning of set-point and disturbance responses is achieved via a single parameter.
  • Quantitative performance estimation is provided by the control scheme.

Conclusions:

  • The novel ratio control scheme offers improved performance for processes with time delays.
  • The analytical design ensures ease of understanding and tuning.
  • The method is validated through simulation examples.