US 12,176,751 B2
Non-current equalization UPS apparatus, current distribution method, and parallel UPS system
Zhou Shu, Dongguan (CN); and Chuntao Zhang, Dongguan (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Guangdong (CN)
Filed on Jan. 24, 2023, as Appl. No. 18/158,910.
Application 18/158,910 is a continuation of application No. PCT/CN2020/104700, filed on Jul. 25, 2020.
Prior Publication US 2023/0187966 A1, Jun. 15, 2023
Int. Cl. H02J 9/06 (2006.01); H02J 7/00 (2006.01)
CPC H02J 9/061 (2013.01) [H02J 7/00032 (2020.01); H02J 7/0013 (2013.01); H02J 7/0048 (2020.01); H02J 7/0063 (2013.01); H02J 7/00712 (2020.01); H02J 9/062 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A non-current equalization UPS apparatus for a parallel uninterruptible power system (UPS) system including the non-current equalization UPS apparatuses, and including a plurality of battery strings correspondingly connected to the plurality of non-current equalization UPS apparatuses, each non-current equalization UPS apparatus comprising:
a power module configured to connect to a first battery string of the plurality of battery strings; and
a control module in communication with the power module, the control module being configured to:
when each non-current equalization UPS apparatus of the plurality of non-current equalization UPS apparatuses supplies power using a corresponding battery string, obtain a capacity proportion of an available battery capacity of the first battery string in a total available battery capacity of the plurality of battery strings;
calculate, based on the capacity proportion and the total output current, a first current value corresponding to the non-current equalization UPS apparatus, wherein the first current value is equal to a product of the capacity proportion and a current value of the total output current; and
control, based on the capacity proportion, the power module to output a first current to a load, wherein a current proportion of the first current in a total output current of the parallel UPS system is positively related to the capacity proportion, the controlling comprising:
when the first current value is less than a current value of a rated output current of the non-current equalization UPS apparatus, control the current value of the first current to be a second current value, wherein the second current value is not greater than the current value of the rated output current and is not less than the first current value;
when the first current value is the current value of the rated output current of the non-current equalization UPS apparatus, control the current value of the first current to be the current value of the rated output current; or
when the first current value is greater than the current value of the rated output current of the non-current equalization UPS apparatus, control the current value of the first current to be a third current value, wherein the third current value is not greater than the current value of the rated output current of the non-current equalization UPS apparatus.