On the control of a large chemical plant by using modal analysis

  • Authors:

  • E. J. Davison;K. J. Chadha

  • Affiliations:

  • Department of Electrical Engineering, University of Toronto, Canada;Department of Electrical Engineering, University of Toronto, Canada

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 1972

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Abstract

This paper describes an application of modal analysis for determining the control system of a chemical plant described by 41 linearized differential equations with 8 inputs. A proportional feedback control system is found so that the dominant time constant of the closed loop system is reduced and then an integral feedback control system is found to eliminate the effect of constant unknown disturbances on the system. The modal design method used gives a control configuration for the plant i.e. it indicates which control inputs should be used and what states of the system should be measured in the control system. The dominant time constant of the closed loop plant is reduced by more than a factor of 2 using the proposed method and simulation of the controlled system shows that the output of the plant is effectively controlled.