US 12,249,921 B2
Parallel operation of load commutated inverters
Sreedhar Desabhatla, Bavaria (DE); and John Andrew Leonard, Roanoke, VA (US)
Assigned to GE Infrastructure Technology LLC, Greenville, SC (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Mar. 23, 2023, as Appl. No. 18/188,548.
Prior Publication US 2024/0322703 A1, Sep. 26, 2024
Int. Cl. H02M 5/45 (2006.01); H02M 1/08 (2006.01); H02M 5/451 (2006.01); H02P 27/06 (2006.01)
CPC H02M 5/4505 (2013.01) [H02M 1/08 (2013.01); H02M 5/451 (2013.01); H02P 27/06 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system, comprising:
a plurality of load commutated inverters (LCIs) connected in parallel, wherein each LCI includes:
a source bridge for converting an alternating current (AC) voltage to a direct current (DC) voltage, wherein the source bridge includes at least one current switching device;
a load bridge for converting the DC voltage from the source bridge to a variable frequency AC voltage;
a DC link coupling the source bridge to the load bridge, wherein each LCI includes a respective current regulator for controlling the at least one current switching device in the source bridge of the LCI to generate a current in the DC link;
a controller;
an electrical machine; and
a speed regulator coupled to the electrical machine for outputting a signal to the controller indicating a total current required by the system to operate the electrical machine at a desired speed, wherein the controller outputs a current value to each respective current regulator equal to the total current required by the system divided by the total number of LCIs.