Parallel operation of load commutated inverters
AssigneeGE Infrastructure Technology LLC
InventorsSreedhar Desabhatla, John Andrew Leonard
Life of this patent
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Abstract
A system, including: 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; and 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.
Claims16
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.
A drive 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, wherein the load bridge includes at least one current switching device;
- and
- 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, and wherein the respective current regulator in each LCI generates the same current in the DC link of each LCI;
- 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.
Dependencies are inferred from the claim text.