Truong Nguyen Luan Vu, Jietae Lee, and Moonyong Lee
International Journal of Control, Automation, and Systems, vol. 5, no. 2, pp.212-217, 2007

Abstract : A new method of designing multi-loop PID controllers is presented in this paper. By using the generalized IMC-PID method for multi-loop systems, the optimization problem involved in finding the PID parameters is efficiently simplified to find the optimum closed-loop time constant in a reduced search space. A weighted sum Mp criterion is proposed as a performance cost function to cope with both the performance and robustness of a multi-loop control system. Several illustrative examples are included to demonstrate the improved performance of the multi-loop PID controllers obtained by the proposed design method.

Keyword : Generalized IMC-PID method, MIMO system, Mp criterion, multi-loop PID controller, PID controller tuning, process interaction.