Development of New Smith Predictor Controller and a Disturbance Observer for Control of the Superheater and the Steam Pressure

보일러 과열기 및 증기 압력 제어를 위한 외란 관측기 및 새로운 스미스 예측제어기 개발

The steam superheater and the steam pressure systems are time delay systems that have poles near the origin in the left half plane or a pure integrator. Smith predictor can't be applied to these systems any more, because of occurring the steady state error for the step disturbance. In this paper, a new Smith predictor controller for the steam superheater and the steam pressure is proposed. A disturbance observer to estimate an input disturbance and a new controller to eliminate an effect of a disturbance are proposed. The computer simulation results are shown the efficiency of the proposed system.