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Disturbance-Kalman state for linear offset free MPC

Tuan Truong Thanh, Zabiri Haslinda, Mutalib Mohammad Ibrahim Abdul, Vo Dai-Viet N.

Archives of Control Sciences

2022

Vol. 32, No. 1

153--173

In model predictive control (MPC), methods of linear offset free MPC are well established such as the disturbance model, the observer method and the state disturbance observer method. However, the observer gain in those methods is difficult to define. Based on the drawbacks observed in those methods, a novel algorithm is proposed to guarantee offset-free MPC under model-plant mismatches and disturbances by combining the two proposed methods which are the proposed Recursive Kalman estimated state method and the proposed Disturbance-Kalman state method. A comparison is made from existing methods to assess the ability of providing offset-free MPC on Wood-Berry distillation column. Results shows that the proposed offset free MPC algorithm has better disturbance rejection performance than the existing algorithms.