2014 Volume 27 Issue 3 Pages 95-100
The idea of control performance assessment is becoming very important in the process control area. However, the low control performance index denotes only the deterioration of control performance. The strategies of the parameter retuning are not suggested. And, the control performance of the new controller can not be estimated, because the calculation of control performance index needs to apply the new controller into the real systems. In the real plant, when the performance index shows the bad value which mean the control performance is deteriorated, the retuning of the controller is done by plant operator based on their experiments. However, if this retuning is failed, the performance of this plant is more deteriorated. This paper proposes the retuning method of PID controller based on the controller performance assessment. The objective of the proposed scheme is to close the target performance of PID controller when controller performance deteriorates. The retuning mechanism is based on the estimated controller performance with the on-line system identication. Finally, numerical evaluations demonstrate the practically and utility of this idea.