Energy Regeneration in Direct Torque Control Drive of Induction Motor

Abstract

This paper discusses kinetic energy recovery into electrical energy during deceleration of an industrial three-phase induction motor. The energy recovery helps to improve the efficiency of the induction motor drive. Simulation of direct torque control (DTC) drive for induction motor with load is carried out, and energy recovery results are shown. Improving energy utilization of a DTC-based induction motor drive for traction and industrial drives is discussed. Energy-saving opportunity is more where rapid deceleration/acceleration occurs. High inertia load like elevators, escalators, high-inertia rotary saws, rock crushers and grinders with flywheels, sheet saws driven by high-inertia wheels, centrifuges, and flywheel presses have more chance to get energy regeneration during deceleration. Induction motor drives which use braking resistors need to be removed, and energy storage devices need to be charged during deceleration of induction motor through the bidirectional converter for energy recovery.