The Effect of Controller Parameters on Closed-loop System Identification of Multiple-Input Multiple-Output (MIMO) Systems

In the industries today, less attention has been put on the effect of the controller parameters on closed loop system identification of a Multiple-Input Multiple-Output (MIMO) system. This paper studies the effect of Proportional controller and Proportional-Integral controller on a MIMO system using ARX model. The paper focuses on the effect of the controller parameters of a MIMO system on closed loop system identification when both loops are closed and one loop is open. It is observed that different parameters give different effects on the closed loop system identification. Generally, it is better to keep the gain lower if only Proportional controller is used. For a distillation column, a MIMO system in this project, neither too high or too low gain give a better model accuracy for both closed loop and one loop open when Proportional-Integral controller is used.