State observer design for bilinear systems with application to induction motors

This paper proposes a convex approach to design robust state observers for (extended) bilinear systems subject to parameter uncertainty, bounded disturbance and control signals, and unknown initial conditions. The estimator design problem is cast as a set of state-dependent linear matrix inequalities which can be solved very efficiently using standard software packages. The proposed methodology is applied to the problem of flux estimation in current-fed induction motors.