New Adaptive High Starting Torque Scalar Control Scheme for Induction Motors Based on Passivity
A novel adaptive high starting torque (HST) scalar control scheme (SCS) for induction motors (IM) is proposed in this paper. It uses a new adaptive passivity based controller (APBC) proposed herein for a class of nonlinear systems, with linear explicit parametric dependence and linear stable internal dynamics, which encompasses the IM dynamical model. The main advantage of the HST SCS includes the ability to move loads with starting torque over the nominal torque with a simple and cost effective implementation without needing a rotor speed sensor, variable observers, or parameter estimators. The proposed APBC is based on a direct control scheme using a normalized fixed gain (FG) to fine tune the adaptive controller parameters. The basic SCS for induction motors (IM) and the HST SCS were applied to an IM of 200 HP and tested using a real time simulator controller OPAL RT showing the achievement of the proposal goal.