Optimal Discrete-Time Complete Order State Observer Applied to Asynchronous Machine Drive Systems

In this work, the state observer problem of multivariable systems, using optimal discrete-time complete order state observer applied to high performance Asynchronous Machine drive systems is considered. Due to the computational time to discretize the model, the procedure is carried off-line, resulting in a discrete model with only algebraic relations. The feedback matrix (gains) is also calculated off-line, using an optimal control law. The gains are calculated for some machine frequencies, resulting in some matrix gains operating in scheduled form (gain scheduling). Note that multiple gain matrix solutions exist. This variety can be used to provide robust properties for the closed loop system and should make the system insensitive to perturbations.