Design of Modified Dead-time compensators for stable processes with integrator and longer time using Adaptive control

Saravanakumar, G and Wahidha Banu, R S D and Nayak, Gurudas C (2006) Design of Modified Dead-time compensators for stable processes with integrator and longer time using Adaptive control. Automatic Control and System Engineering, 6 (4).

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Abstract

The smith predictor is well known as an effective deadtime compensator for a stable process with largedead time. The previous modes of smith predictors such as Internal model control and Predictive control can not be used for processes having an integral mode and longer dead times. Since a constant load disturbance will result in steady- state error. This paper presents two approaches to overcome this problem. In the first approach the smith predictor was able to overcome the set point response and Load response. In the second approach an I-PD controller is used and, it is proved that there is no steady state error for a constant load disturbance. An approach to auto-tune this l-PD controller for plants with longer dead-time is also attempted by deriving adaptive controller gains.

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