Interative Feedback Tuning for Positive Feedback Time Delay Controller

  • Tsang Kai-Ming (Department of Electrical Engineering, Hong Kong Polytechnic University) ;
  • Rad Ahmad B. (Department of Electrical Engineering, Hong Kong Polytechnic University) ;
  • Chan Wai-Lok (Department of Electrical Engineering, Hong Kong Polytechnic University)
  • Published : 2005.12.01

Abstract

Closed-loop model-free optimization of positive feedback time delay controllers for dominant time delay systems is presented. Iterative feedback tuning (IFT) is applied to the tuning of positive feedback time delay controller. Three experiments are carried out to perform the model-free gradient descent optimization. The initial controller parameters and duration in specifying the cost function are suggested. The effects of step size, filter function and time weighting function on the performance of the optimized controlled are given. Simulation and experimental studies are included to demonstrate the effectiveness of the tuning scheme.

Keywords

References

  1. T. Hagglund, 'A predictive PI controller for processes with long dead time,' IEEE Control Systems Magazine, vol. 12, pp. 57-60, 1992 https://doi.org/10.1109/37.120455
  2. K. M. Tsang, A. B. Rad, and W. L. Lo, 'PID controllers for dominant time delay systems,' Control Comput. vol. 22, no. 3, pp. 65-69, 1994
  3. K. M. Tsang, A. B. Rad, and W. L. Chan, 'Autotuning positive feedback time delay controller for dead time processes,' ISA Trans. vol. 41, pp. 51-56, 2002 https://doi.org/10.1016/S0019-0578(07)60202-X
  4. P. J. Gawthrop, M. T. Nihtila, and A. B. Rad, 'A recursive parameter estimation of continuous time systems with unknown time delay,' Control Theory Adv. Technol. vol. 5, pp. 227-248, 1989
  5. A. B. Rad, K. M. Tsang, and W. L. Lo, 'Adaptive control of dominant time delay systems via polynomial identification,' IEE Proc.-D: Control Theory Appl. vol. 142, no. 5, pp. 433-438, 1995
  6. K. M. Tsang, W. L. Lo, and A. B. Rad,' Adaptive delay compensated PID controller by phase margin design,' ISA Trans. vol. 37, pp. 177-187, 1998 https://doi.org/10.1016/S0019-0578(98)00019-6
  7. H. Hjalmarsson, M. Gevers, S. Gunnarsson, and O. Lequin, 'Iterative feedback tuning: Theory and applications,' IEEE Systems Magazine, vol. 18, pp. 26-41, 1998
  8. L. Ljung, System Identification - Theory for The User, Prentice-Hall, New Jersey, 1987
  9. Feedback Instruments Ltd., Process Control Simulator PCS327, FI Ltd., Crowborough, England