| 摘要 |
A process control system includes a feedback controller and has at least one manipulated variable and one controlled variable. A feedforward loop is included, the system being subject to a disturbance. Independent feedforward control is incorporated into the feedback controller which comprises the following steps. A feedforward control funnel and a feedback control funnel are defined for each cv, specifying a time T FF in which the disturbance is to be eliminated and a ti me T 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 FF is less than T FB, the feedback control speed is compensated such that the feedback controller speed is not increased. If T FF is greater than or equal to T FB, no compensation is performed, thereby effectively providing independent tuni ng parameters for the feedforward control solution and the feedback control solution. New values of the cvs are calculated and the process controlled by the newly calculated cvs.
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