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Improved Cascade Control System for a Class of Unstable Processes with Time Delay

  • Cheng-qiang Yin
  • Hong-tao Wang
  • Qun Sun
  • Ling Zhao
Regular Papers Control Theory and Applications
  • 16 Downloads

Abstract

An improved cascade control scheme is proposed based on modified Smith predictor for controlling a class of unstable processes with time delay. The proposed control structure consist three controllers of which the secondary loop has one controller and the primary loop has two controllers. The secondary loop controller is designed according to Internal Model Control (IMC) principles. The primary loop set point tracking controller and disturbance rejection controller are designed using the same procedure based on modified Smith predictor control structure. An analytical method on the basis of the Internal Model Control design principle is adopted for the two controllers which reduces complexity in design. The two controllers in primary loop are designed as proportional, integral and derivative (PID) controller cascaded with a lead-lag filter. Moreover, suitable values are recommended for the three controllers based on extensive simulations. Simulations studies are carried out to demonstrate the effectiveness of the proposed method.

Keywords

Cascade control modified Smith predictor PID controller time delay unstable process 

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Copyright information

© Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Cheng-qiang Yin
    • 1
  • Hong-tao Wang
    • 2
  • Qun Sun
    • 1
  • Ling Zhao
    • 1
  1. 1.School of Mechanical and Automobile EngineeringLiaocheng UniversityLiaochengChina
  2. 2.Beijing Institute of Electronic System EngineeringBeijingChina

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