Model Reference Adaptive Control of Thyristor Driven DC Motor Systems Subject to Current Limit a Tions

Abstract

Direct model reference output adaptive control procedures, which do not require the existence of model matching conditions, have been applied to the speed control of a thyristor driven DC motor system. Taking into account both current and current rate limitations, the adaptive algorithm was used to generate the set point for a dual mode thyristor current regulator which was also adjusted depending upon whether or not the thyristor circuit was in the continuous or discontinuous conduction mode. Tests with representative variations in inertia and torque load showed the adaptive algorithm to be more robust than a constant model following controller and a conventional PI speed control system.