Browsing by Author "Mudi, Rajani K."

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An improved auto-tuning scheme for PI controllers
(2008-01-01)
Mudi, Rajani K.
;
Dey, Chanchal
;
Lee, Tsu-Tian
;
電控工程研究所
;
Institute of Electrical and Control Engineering
Ziegler-Nichols tuned PI and PID controllers are usually found to provide poor performances for high-order and nonlinear systems. In this study, an improved auto-tuning scheme is presented for Ziegler-Nichols tuned PI controllers (ZNPICs). With a view to improving the transient response, the proportional and integral gains of the proposed controller are continuously modified based on the current process trend. The proposed controller is tested for a number of high-order linear and nonlinear dead-time processes under both set-point change and load disturbance. It exhibits significantly improved performance compared to ZNPIC, and Refined Ziegler-Nichols tuned PI controller (RZNPIC). Robustness of the proposed scheme is established by varying the controller parameters as well as the dead-time of the process under control. (c) 2007, ISA. Published by Elsevier Ltd. All rights reserved.