Abstract

Abstract Generally, most long‐range predictive control (LRPC) gives good set point responses in multivariable process control. However, on several occasions, little improvement in load rejection was observed when comparing LRPC with well‐tuned multiloop SISO controllers. In this study, the dynamic matrix control (DMC) algorithm is modified to improve disturbance rejection capability. A two‐degree‐of‐freedom DMC is proposed by incorporating the step‐response models for the major load disturbance. A load tuning factor is used to adjust the degree of load prediction. A non‐linear distillation column is used to test the effectiveness of the proposed algorithm. Simulation results show that, while maintaining good set point responses, the proposed algorithm outperforms the standard DMC algorithm for both the modeled and unmodeled load disturbances.

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