Modified GPC Controller for Control of Processes with Long Dead-Time and Integral Action

Abstract

Processes with dead time are the processes with time lags between output and input. Time lags aggravate control by reducing the phase margin of the closed-loop control. At dead time, integral action causes an additional problem with the control of such a process. This paper presents a modified GPC controller, and compares the modified GPC controller with the controllers mainly used today for such a process type. Modified GPC controller contains a part that takes into account the disturbance dynamics in the past and future. The use of the modified GPC controller can completely eliminate the impact of disturbance on the controlled value, if the change of disturbance is known in the future in the quantity of dead time. However, if the value of disturbance is not known in the future, the improvement is still reached, because this part takes into account the disturbance dynamics in the past. Simulated results were obtained for the process of water level control in Lipa compensation basin, and the conclusions on the quality of individual controllers in the time domain were made.

Danijel Jolevski

Associate Professor | Department of Electrical Drives and Industrial Control

Ozren Bego

Associate Professor | Department of Electrical Drives and Industrial Control

Ranko Goić

Full Professor | Department of Power Grids and Substations

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split exeperienced in transmission and distribution networks, renewable energy sources (RES), power system planing and economics