Abstract
Based on the parallel cascade control structure, the concept of indirect feedforward control is proposed for multivariable systems. The indirect feedforward control uses the fast secondary measurements to sense the load changes and the secondary controllers are designed to take necessary actions to overcome the load disturbances. In the multivariable systems, an interaction measure array (Γ) is defined. The secondary controllers are designed according to Γ to provide indirect feedforward actions. Quantitative results are derived which serve as a measure of robustness for indirect feedforward control when uncertainties are presented in the load transfer functions. A distillation example is used to illustrate the design and performance of the indirect feedforward control. Simulation results show that the proposed method provides an attractive alternative for disturbance rejection.
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