2003 Volume 123 Issue 5 Pages 962-969
PID control schemes have been widely used for various process control systems for a long time. However, since such processes have relatively large time-delays and uncertainties caused by modeling errors and system fluctuation, it is non-trivial to choose a suitable set of PID parameters. In this paper, a design scheme of self-tuning PID controllers is proposed for unknown processes with time-delays. This scheme is equipped with a parallel feedforward compensator to compensate for the time-delays. The PID control system is then designed for the augmented system. The PID control parameters are calculated adaptively based on on-line process identification and the relationship between the minimum variance control law and PID control law.
The transactions of the Institute of Electrical Engineers of Japan.C
The Journal of the Institute of Electrical Engineers of Japan