Comparison of DTC and SVM - DTC of Induction motor drive for Electric Vehicle application

Abstract

Direct Torque Control (DTC) is the most frequently employed approach in electric vehicles due to its numerous benefits. However, torque ripples reduce the system's efficiency due to the hysteresis comparators. This results in variable frequency operation, while the finite frequency sampling produces a pseudorandom overshoot of the hysteresis band. Thus, operation at low speeds, mainly when motor resistances vary, affects the machine's behavior. In this paper, a switching scheme for speed control of induction motor driven EV is assessed in light of Space Vector Modulation to improve the performance. The findings of the simulation study represent a reduction in torque, flux ripple, and current harmonics. A comparative analysis of the proposed technique with the conventional DTC shows improved performance.