Optimal design of multi-loop PI controllers for enhanced disturbance rejection in multivariable processes

  • Authors:

  • Truong Nguyen Luan Vu;Moonyong Lee

  • Affiliations:

  • School of Chemical Engineering and Technology, Yeungnam University, Gyeongsan, Gyeongbuk, Korea;School of Chemical Engineering and Technology, Yeungnam University, Gyeongsan, Gyeongbuk, Korea

  • Venue:
  • CONTROL'07 Proceedings of the 3rd WSEAS/IASME international conference on Dynamical systems and control
  • Year:
  • 2007

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Abstract

The proposed method presents a new design for multi-loop PI controllers in MIMO systems in two cases: set-point tracking and disturbance rejection. It can identify the tuning parameters of multi-loop PI controllers by starting from the generalized IMC-PID approach [1], which is extended from single input, single output (SISO) systems to multiple input, multiple output (MIMO) systems. Control parameters obtained from the IMC-PID approach have shown good performance for several control systems. However, there is not enough robustness in systems which contain a lot of noise and disturbance. A new design can solve this problem by applying the magnitude of sensitivity (Ms) theory. A simulation study is performed for the well-known process model and the response performances compared favorably with some famous tuning methods. The results show that the proposed method is superior to existing techniques for multi-loop processes.