Pseudo-Derivative Feedback Based Identification of Unstable Processes with Application to a Bioreactor

Abstract

The use of a pseudo-derivative feedback structure for parameter identification of unstable first order plus dead-time processes is investigated. Two alternative identification methods are presented. The proposed identification methods require small computational effort and they are particularly useful for on-line applications. They ensure considerably smoother response (i.e. less overshoot), than known identification methods based on standard PI/PID controllers, while providing better accuracy and more simplicity in implementation, due to the simpler structure of the pseudo-derivative feedback controller used.