A Novel Direct Torque Control Scheme for High-Speed Control of Switched Reluctance Motor Using 4-Level Torque Controller

Abstract

The paper proposes a novel direct torque control (DTC) scheme that incorporates a 4-level hysteresis torque controller for high-speed operation of switched reluctance motor (SRM). The proposed DTC scheme is a novel one that incorporates three modifications to the conventional DTC adopted for SRM. Firstly, the flux hysteresis control loop of conventional DTC is removed, and the sector identification in one electrical cycle is based on the actual rotor position and inductance profile. Secondly, the paper proposes a rule to select an optimized set of voltage vectors for the proposed sector configuration. Finally, the proposed scheme incorporates a 4-level hysteresis torque controller that improves torque/ampere at speed below the base speed and minimizes the torque ripple at a higher speed. The proposed DTC scheme is tested on the motor designed in ANSYS MAXWELL, and the static torque characteristics obtained are used to control the SRM in the MATLAB/Simulink environment. The proposed DTC scheme can be applied to SRM irrespective of the phase number with appropriate modifications.