Acta Metallurgica Sinica(English letters) ›› 2011, Vol. 18 ›› Issue (5): 114-117.doi: 10.1016/S1005-8885(10)60112-4

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Research on fuzzy self-adaptive PI-Smith control in long time-delay system

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  1. School of Automation, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
  • Received:2011-01-28 Revised:2011-05-31 Online:2011-10-31 Published:2011-10-13
  • Supported by:

    This work was supported by the Natural Science Foundation of Shaanxi Province (2007F18), the Scientific Research Program of Shaanxi Provincial Education Department (2010JC19).

Abstract:

The long time-delay often exists in industrial process. In order to overcome the big overshoot and long regulating time of the long time-delay system control, a new fuzzy self-adaptive PI-Smith control method is proposed. This method combines the Smith predictive control with fuzzy self-adaptive proportional-integral (PI) control. The traditional proportional-integral-derivative (PID) controller in Smith predictive control is replaced by fuzzy PI controller which utilizes the principle of fuzzy control to tune parameters of PI controller on-line. The results of simulation for electric furnace show that the method has the advantages of shortening regulating time, no overshoot, no steady-state error, excellent control accuracy, and good adaptive ability to the change of system model.

Key words:

self-adaptive, fuzzy PI control, Smith predictive control, long time-delay