Improvement of Inverter Efficiency of Three-phase Induction Motor Control System by Space Vector Pulse-width Modulation Method

The algorithms of space vector pulse-width modulation (SVPWM) with the use of additional reference vectors are proposed in this article. The proposed algorithms increase the efficiency of the frequency converter, which will eliminate the through currents in the voltage source inverter (VSI) and reduce amount of calculation in the microcontroller. In this paper the simulation model of the induction motor (IM) with SVPWM control constructed in MATLAB is studies. The results of simulation modeling of the proposed algorithms are presented using different trajectories of the voltage space vector. Comparative analysis of the results is provided based on the type of trajectories and on the number of voltage space vectors being generated for the fluctuations speed, torque, and current of the IM's stator. Result analysis showed that the proposed algorithms using additional reference vectors, not only eliminate the through currents in a three-phase VSI, but also reduce the variations in fluctuations speed, motor torque and stator current, and improve the speed of the electric drive.