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Enhanced IMC design of load disturbance rejection for integrating and unstable processes with slow dynamics
Authors:Liu Tao  Gao Furong
Affiliation:
  • a Department of Chemical & Biomolecular Engineering, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
  • b AVT-Process Systems Engineering, RWTH Aachen University, Turmstrasse 46, Aachen, Germany
  • Abstract:In view of the deficiencies in existing internal model control (IMC)-based methods for load disturbance rejection for integrating and unstable processes with slow dynamics, a modified IMC-based controller design is proposed to deal with step- or ramp-type load disturbance that is often encountered in engineering practices. By classifying the ways through which such load disturbance enters into the process, analytical controller formulae are correspondingly developed, based on a two-degree-of-freedom (2DOF) control structure that allows for separate optimization of load disturbance rejection from setpoint tracking. An obvious merit is that there is only a single adjustable parameter in the proposed controller, which in essence corresponds to the time constant of the closed-loop transfer function for load disturbance rejection, and can be monotonically tuned to meet a good trade-off between disturbance rejection performance and closed-loop robust stability. At the same time, robust tuning constraints are given to accommodate process uncertainties in practice. Illustrative examples from the recent literature are used to show effectiveness and merits of the proposed method for different cases of load disturbance.
    Keywords:Integrating and unstable processes   Internal model control (IMC)   Load disturbance rejection   Slow dynamics   Asymptotic tracking   Robust stability
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