Abstract: This paper proposes a new Smith predictor for controlling a process with an integrator and long dead times. The structure comprises the classical Smith controller, in the main control loop, and the disturbance estimator, in the local minor loop. The main feature of the structure consists in ability to reject the constant, ramp, and slow varying unmeasurable external disturbances. The controlling structure in this paper allows more freedom in choosing controller parameters in order to improve both the set-point response and efficiency of disturbance rejection.
Key words: Smith predictor, process controlling, PID controller, PI controller, disturbance estimator.