Modified Smith predictor with PID structure for control of multivariable processes
by Rames C. Panda, Moses O. Tade
International Journal of Process Systems Engineering (IJPSE), Vol. 1, No. 2, 2011

Abstract: Industrial processes with dead time, can be controlled using a model-based control strategy called 'Smith predictor' (SP) to compensate for the dead time part. Most of the control loops in process industries use PID loops. By introducing a tuning parameter (Ksp) in the control law, to switch between SP and proportional-integral-derivative (PID) modes, an SP with PID (SP-PID) is synthesised in this work to counteract the offset and to obtain a better performance during set-point change as well as load changes. Performance of SP-PID to control linear MIMO systems (square, stable, non-singular linear) are carried-out with decentralised scheme by studying set-point change and load disturbances separately. Present results have been compared with similar existing control strategies. Sensitivity and robustness issues of the present control scheme are also discussed.

Online publication date: Wed, 14-Jan-2015

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