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Nowadays, with the demand of high speed traction applications, for example traditional locomotive or Electric Multiple Units, medium-voltage high power AC drives are required. In the high power AC drives, the switch frequency of the devices has to be limited in order to reduce the loss of the power semiconductor devices. The modulation strategy is made up of asynchronous modulation, synchronous modulation...
This paper presents results of application of a new method of synchronized pulsewidth modulation (PWM) for control of symmetrical six-phase traction drives with two DC sources. The six-phase (dual three-phase) drive system includes in this case a symmetrical induction motor which has two sets of windings spatially shifted by 60 electrical degrees. Analysis of operation of the symmetrical six-phase...
Recent articles demonstrate that sensorless drives for induction motors can operate at zero-electrical and mechanical frequencies with the aid of high-frequency signal injection techniques and processing the zero-sequence voltage signals. The paper presents some practical implementation issues affecting the performance of such a technique and shows how to improve the quality of the estimated angle...
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