Experimental verification of new energy saving position control algorithm for AC drives

Abstract

The paper describes development of a new energy saving control algorithms for precise position control for AC drives. Designed control algorithms limit energy consumption for defined rotor position maneuver, increase efficiency of the drive and contribute to the substantial improvements of environment. Overall position control system consists of three parts. As the first part, the `minimum energy generator' computes a special acceleration, velocity and position profile, where the magnitude and time of acceleration or deceleration are determined such a way that comply with position demand and prescribed time for position maneuver. The role of `feed-forward precompensator', as a second part, is to achieve precise tracking of the prescribed reference position with zero dynamic lag. Third part is position controller, which can be based on field oriented control, forced dynamics control or sliding mode control. Developed `energy saving control algorithms' are easy to implement digitally and can be exploited for position control of existing a.c. drives.