Nonlinear H-2 and H-infinity optimal controllers for current-fed inductionmotors

This paper presents a nonlinear control design for both the H-2 and H-infin ity optimal control for current-fed induction motor drives. These controlle rs are derived using the analytical stationary solutions obtained in [3] th at minimizes a generalized convex energy cost Function including the stored magnetic energy and the coil losses, while satisfying torque regulation co ntrol objectives. Explicit control expressions for both the H-2 and H-infin ity optimal design are given. Furthermore, the optimal attenuation factor, i.e., the optimal H-infinity norm and the corresponding worst case disturba nce, are both computed explicitly.