Comparison of different control methods in switched reluctance drive system

Abstract

Comparison of different torque control methods is presented in this paper, including current chopping control (CCC), torque sharing function (TSF) control and direct instantaneous torque control (DITC). These control methods play different roles in reducing torque ripples, increasing total output torque and getting maximum efficiency in different speed range.For example, DITC can reduce torque ripples at low speed obviously while it does not work out at high speed. TSF can reduce torque ripples efficiently at high speed but, in the meantime, it leads to total output torque decrease. CCC can output higher torque compared with previous two control methods, however its torque ripples is higher at high speed . In this paper, these three control methods are introduced and their performances are compared in terms of torque ripples and maximum output torque in order to further understand their inherent characteristics. Torque ripple-speed performance and the maximum output torque-speed performance of these control methods are obtained based on simulation results. Theoretical comparison and analysis brings us the guideline of how to select optimal control methods of SR drive system in different speed range for getting better output performance.