H∞ optimal design of rotor flux oriented controlled induction motor drives

In this paper the design of a control system for rotor flux oriented controlled induction motor drives using H_∞ optimal control theory is carried out. The variable to be controlled is the shaft velocity. Two H_∞ problems are formulated and solved: (i) a 1-block problem with the view to maximizing the system performance; (ii) a 2-block problem with the weights initially chosen for maximizing both the system performance (transient response) and the system tolerance to uncertainty in the plant model (robust performance), and in the sequel the weights are modified to account for transient performance and noise attenuation. All the designed controllers have been implemented in a real system, and the results are shown in the paper.