Control of integral processes with dead-time. Part 1: Disturbance observer-based 2DOF control scheme

This paper reveals that a disturbance observer-based control scheme is very effective in controlling integral processes with dead time. The controller can be designed to reject ramp disturbances as well as step disturbances, even arbitrary disturbances. Only two parameters are left to tune when the plant model is available . One is the time constant of the setpoint response and the other is the time constant of the disturbance response. The latter is tuned according to the compromise between disturbance response and robustness. This control scheme has a simple, clear, easy-to-design, easy-to-implement structure and good performances. It is compared to the best results (so far) using some simulation examples. Index Terms: Dead-time compensator, robustness, integral processes, disturbance observer, Smith predictor, 2DOF IMC

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