| Abstract |
We investigated the use of three levels inverters instead of two levels inverters to reduce circulating
currents in a double star asynchronous machine (DSAM). For this, we developed a basic model of
DSAM to explain the origin of circulating currents. Firstly, we investigated a DSAM supplied by two
levels inverters, and then by three levels inverters to show improvements introduced by three levels
inverters. Secondly, We have studied three possibilities to choose the two carrier frequency signals to
control three levels inverters. Our simulation results showed that the currents harmonic content was
lower with three levels inverters than two levels inverters. Moreover, we showed that torque ripple,
electronic components commutation frequency, and amplitude of circulating currents can be reduced
with three levels inverters controlled with two unipolar carriers signals in opposition phase. |
