US 12,015,304 B2
Power supply system, power supply method, control apparatus, and computer storage medium
Zhou Shu, Dongguan (CN); and Ran Li, Dongguan (CN)
Assigned to HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Oct. 19, 2022, as Appl. No. 17/969,194.
Claims priority of application No. 202111220863.6 (CN), filed on Oct. 20, 2021.
Prior Publication US 2023/0122255 A1, Apr. 20, 2023
Int. Cl. H02J 9/06 (2006.01); H02J 3/01 (2006.01); H02J 3/18 (2006.01); H02J 3/32 (2006.01)
CPC H02J 9/062 (2013.01) [H02J 3/01 (2013.01); H02J 3/18 (2013.01); H02J 3/32 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power supply system, comprising:
an uninterruptible power supply (UPS) comprising:
an input terminal configured to:
couple to a power grid using a first node, and
receive an alternating current from the power grid;
an output terminal configured to couple to a load using a second node;
a bypass switch circuit comprising:
a first terminal coupled to the input terminal; and
a second terminal coupled to the output terminal, wherein the bypass switch circuit is configured to connect the power grid to the load;
a direct current to alternating current (DC-AC) conversion circuit, wherein the DC-AC conversion circuit is connected to the output terminal, and wherein the DC-AC conversion circuit is configured to:
receive a first control instruction; and
output a current to the output terminal in response to the first control instruction;
a collection point node disposed between the first node and the second node;
a collection circuit connected to the collection point node, wherein the collection circuit is configured to:
receive a second control instruction; and
collect a current at the collection point node in response to the second control instruction; and
a control circuit configured to:
send the first control instruction to the DC-AC conversion circuit;
send the second control instruction to the collection circuit;
control, in a collection period in a first duration, the collection circuit to collect a first current at the collection point node;
determine at least one of a harmonic component or a reactive current component of the first current;
control, in a current equalization period in the first duration, the DC-AC conversion circuit to output a first compensation current, wherein the current equalization period partially overlaps the collection period, wherein the first compensation current comprises at least one of a first compensation reactive current component or a first quantity of first compensation harmonic components, wherein the first quantity is less than or equal to a second quantity of harmonic components of the first current, wherein the first compensation reactive current component in the first quantity of first compensation harmonic components has a same frequency and an opposite amplitude as the harmonic component of the first current, and wherein the first compensation reactive current component has a same frequency and an opposite amplitude as the reactive current component; and
adjust a second duration in which the bypass switch circuit connects the power grid to the load to balance second currents output by output terminals of different UPSs in a plurality of UPSs or balance third currents output by bypass switch circuits of the different UPSs.