US 12,470,070 B2
Photovoltaic system and power supply current control method thereof
Zhiwu Xu, Shenzhen (CN); Lin Li, Shanghai (CN); and Huan Zhao, Shanghai (CN)
Assigned to HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Aug. 3, 2023, as Appl. No. 18/365,034.
Application 18/365,034 is a continuation of application No. PCT/CN2022/071222, filed on Jan. 11, 2022.
Claims priority of application No. 202110169413.2 (CN), filed on Feb. 7, 2021.
Prior Publication US 2023/0387693 A1, Nov. 30, 2023
Int. Cl. H02J 3/38 (2006.01); H02S 40/32 (2014.01)
CPC H02J 3/381 (2013.01) [H02S 40/32 (2014.12); H02J 2300/24 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A photovoltaic system, comprising:
a direct current (DC) bus;
at least two power supply units connected in parallel to the direct current bus, wherein each of the at least two power supply units comprises a DC/DC converter comprising an input end connected to a direct current power source;
a DC/AC converter connected to the at least two power supply units through the direct current bus, wherein, when the DC/AC converter is in a power limiting working mode, the DC/AC converter is configured to:
obtain a current output state parameter of the DC/DC converter in each of the at least two power supply units comprising a current maximum output power of the DC/DC converter in each of the at least two power supply units;
determine, based on the current maximum output power of the DC/DC converter in each of the at least two power supply units, a current maximum output power proportion that is of the current maximum output power of the DC/DC converter in each of the at least two power supply units and that is in a sum of current maximum output powers of the DC/DC converters in the at least two power supply units;
determine a reference output current value of the DC/DC converter in each of the at least two power supply units based on the current maximum output power proportion; and
adjust a current output power of the DC/DC converter in each of the at least two power supply units based on the reference output current value of the DC/DC converter in each of the at least two power supply units to prevent at least one of the DC/DC converters from working in a limit working state.