Patent ID: 9065377
Filing Date: 2015-06-23
Classification: H02M,H02P

Abstract:
1. A load commutated inverter (LCI) drive system for an electrical machine, the system comprising: a first supply bridge comprising a first alternating current to direct current (AC-to-DC) source side converter, a first DC link circuit, and a first direct current to alternating current (DC-to-AC) load side inverter, wherein the first supply bridge is configured to generate a first supply of electric power; a second supply bridge comprising a second AC-to-DC source side converter, a second DC link circuit, and a second DC-to-AC load side inverter, wherein the second supply bridge is configured to generate a second supply of electric power; a controller configured to selectively control at least one of the first supply bridge and the second supply bridge; an input wye-delta transformer electrically connected with the first AC-to-DC source side converter of the first supply bridge and the second AC-to-DC source side converter of the second supply bridge, wherein the first AC-to-DC source side converter is connected at a wye winding and the second AC-to-DC source side converter is connected at a delta winding of the input wye-delta transformer; and an output delta-wye transformer electrically connected at a wye input to the first AC-to-DC source side converter and electrically connected at a delta input to the second AC-to-DC source side converter, wherein the output delta-wye transformer is configured to supply the at least one of the first supply electric power and the second supply electric power to the electrical machine.