Multilevel regeneration drive system

摘要

A drive system for driving a multi-phase motor (such as a three-phase AC motor) or other load. Where a transformer is used, the transformer may have a disconnected wye configuration on the secondary side. The system may also utilize the average or other combination of DC bus voltages of inverters for each load phase, to provide feedback control.

主权项

1. An apparatus, comprising:
a transformer comprising three phases of primary windings, and first, second, and third secondary windings each inductively coupled to a different phase of the three phases of primary windings, wherein the first, second, and third secondary windings are not electrically tied together at a common potential node; a first converter configured to generate a voltage at a first DC bus based on a voltage across the first secondary winding; a second converter configured to generate a voltage at a second DC bus based on a voltage across the second secondary winding; a third converter configured to generate a voltage at a third DC bus based on a voltage across the third secondary winding, wherein the first, second and third converters are coupled to first, second and third input phases, respectively, of a three-phase load; and a combiner configured to generate a voltage based on the voltages at the first, second, and third DC buses.