Method of incorporating independent feedforward control in a multivariable predictive controller
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United States of America Patent
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Oct 1, 1996
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N/A
app pub date -
Jun 14, 1995
filing date -
Jun 14, 1995
priority date (Note) -
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Abstract
A process control system having a feedback controller, at least one manipulated variable and one controlled variable with a feedforward loop is provided. Independent feedforward control is incorporated into the feedback controller by defining a feedforward control funnel and a feedback control funnel for each controlled variable, specifying a time T.sub.FF in which the disturbance is to be eliminated and a time T.sub.FB in which the controlled variable is to reach a steady state value, respectively. The shorter of the feedforward control funnel and the feedback control funnel is selected. If T.sub.FF is less than T.sub.FB, the feedback control speed is compensated such that the feedback controller speed is not increased. If T.sub.FF is greater then or equal to T.sub.FB, no compensation is performed, thereby effectively providing independent tuning parameters for the feedforward control solution and the feedback control solution. New values of the controlled variables are calculated and the process controlled by the newly calculated controlled variables.
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