On The Robustness of Modified Smith Predictor Controller For Time Delay Processes

Abstract

One of the main problems of Smith predictor control of time-delay
processes is, that it does not handle the disturbances, especially in case the process
has an integrator. In this case, the Smith predictor is not able to reset the steady state
error. In this paper a modified Smith predictor control based on a variable structure
algorithms for nominal controller and an approximate model for process is
proposed. It is shown that the proposed method can assure the robustness of system
even in presence of dead-time uncertainty.