Yakhelef Yassine and Boulouh Messaoud
Minimax optimization approach, double PI speed controller, stateobserver, anti-wind-up, saturation, control performance quality
The need to improve the quality and performance of electromechani- cal drive control systems found particularly in paper and steel rolling mill industries is crucial. The objective is to increase the production quality of industrial processes and to use rationally our resources. In this paper, we present a Minimax optimization approach to optimally tune the parameters of a double PI speed controller and a six order state observer–based DC motor drive system with the aim of achieving improvements in its performance properties. To show the superiority of the proposed approach, these improvements are compared to those obtained using an integral-based minimization criterion. In the same scope, we discuss the non-linear behaviour of this system in the presence of actuator saturation; due to the integral wind-up phenomenon. This problem would cause a seri- ous degradation of transient and steady-state performance of the system and an anti-wind-up solution is proposed. The simulation results have shown the efficiency and effectiveness of both Minimax approach and anti-wind-up technique in performance and quality improvement of the system under study.
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