US 11,876,435 B2
DC/DC conversion system, electricity storage system, and method for controlling DC/DC converter
Naoki Ayai, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/763,966
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
PCT Filed Sep. 9, 2020, PCT No. PCT/JP2020/034192
§ 371(c)(1), (2) Date Mar. 25, 2022,
PCT Pub. No. WO2021/106315, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-213013 (JP), filed on Nov. 26, 2019.
Prior Publication US 2022/0320992 A1, Oct. 6, 2022
Int. Cl. H02M 1/00 (2006.01); H02J 3/38 (2006.01); H02J 7/00 (2006.01)
CPC H02M 1/0025 (2021.05) [H02J 3/381 (2013.01); H02J 7/0048 (2020.01); H02M 1/0006 (2021.05); H02J 2300/24 (2020.01)] 9 Claims
OG exemplary drawing
 
1. A DC/DC conversion system provided between a plurality of DC power supplies and a common DC bus, the DC/DC conversion system comprising, for each of the plurality of DC power supplies:
a DC/DC converter provided between the DC power supply and the DC bus;
a control unit configured to control the DC/DC converter; and
a management control unit configured to determine voltage detection deviations for the DC bus corresponding to individual output deviations compared to an entirety of a plurality of DC/DC converters present in parallel, and give correction values for reducing the voltage detection deviations to the respective control units for the plurality of DC/DC converters, wherein
the control unit corrects a voltage detection value for the DC bus based on the respective correction value, and controls the corresponding DC/DC converter in accordance with a voltage command value having droop characteristics with respect to output power.
 
6. An energy storage system including a plurality of DC power supplies and a common DC bus, the energy storage system comprising, for each of the plurality of DC power supplies:
a DC/DC converter provided between the DC power supply and the DC bus;
a control unit configured to control the DC/DC converter; and
a management control unit configured to determine voltage detection deviations for the DC bus corresponding to individual output deviations compared to an entirety of a plurality of DC/DC converters present in parallel, and give correction values for reducing the voltage detection deviations to the respective control units for the plurality of DC/DC converters, wherein
the control unit corrects a voltage detection value for the DC bus based on the respective correction value, and controls the corresponding DC/DC converter in accordance with a voltage command value having droop characteristics with respect to output power.
 
9. A method for controlling a plurality of DC/DC converters provided in parallel to each other between a plurality of DC power supplies and a common DC bus, the method comprising:
determining voltage detection deviations for the DC bus corresponding to individual output deviations compared to an entirety of a plurality of DC/DC converters present in parallel, and determining a correction value for reducing the voltage detection deviations;
correcting a voltage detection value for the DC bus based on the determined correction value; and
controlling the corresponding DC/DC converter in accordance with a voltage command value having droop characteristics with respect to output power.