Implementation of Space Vector Modulation Strategies for Voltage Source Inverters with Induction Motor Drives Student Krisztina Leban “Politehnica” University of Timisoara, Bd. Vasile Parvan nr.1, Timisoara Romania. E-mail: Krisztina_leban@yahoo.com.au Abstract This paper reports on a DSP implementation of a space vector pulse-width modulation technique for three-phased voltage source inverters working with high switching frequencies in order to generate less harmonic distortion in the output voltages or current in the motor windings. This strategy provides more efficient use of the DC bus voltage in comparison with the direct sinusoidal modulation technique. Also a comprehensive comparison between the implementation of the space vector modulation and the carrier based PWM generation will be pointed out. A standard application for this method is the speed control of induction machines. Thus the induction machine can be smoody started with the help of the ratio voltage/frequency held constant. The control strategy relies on a simpliﬁed machine model. The values of switching time durations are obtained by real-time calculations for each period using an optimal algorithm and the proprieties of the sinusoidal wave forms. The TMS320F2812 DSP was used to implement this method. This DSP allows the implementation of software written for older and slower TMS versions. It also allows flexibility in programming giving various ways of achieving the desired results. As the graphics show, the generated first harmonic output gets ever closer to the sinusoidal wave when the switching frequency is raised. The maximum value of the transistor’s switching frequency is determined in deal with the required computing time for each applied method. The imposed frequency is around 10 kHz.