Transient performance comparison of switched doubly-fed machine propulsion drives

Switched doubly-fed machines (DFM) offer unique opportunities for creating drives for wide speed range operation with reduced power converter requirements. Seamless performance of the drive is desirable in these applications across the complete speed range, that is, a smooth transition between operating modes and speed ranges. This paper presents a comparison of two switched-DFM drive topologies based on the transient performance specifically around the mode transition speed. Thyristor-based transfer switch operation is compared for the two topologies.