US 12,483,036 B2
Photovoltaic power supply system and control method thereof, and air conditioning unit
Ningning Chen, Guangdong (CN); Xianqiao Yu, Guangdong (CN); Jing Wang, Guangdong (CN); Meng Huang, Guangdong (CN); and Peiyu Dang, Guangdong (CN)
Assigned to Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Appl. No. 18/016,257
Filed by Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
PCT Filed Jul. 12, 2021, PCT No. PCT/CN2021/105667
§ 371(c)(1), (2) Date Jan. 13, 2023,
PCT Pub. No. WO2022/077973, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 202011105878.3 (CN), filed on Oct. 15, 2020; and application No. 202110038982.3 (CN), filed on Jan. 12, 2021.
Prior Publication US 2023/0283080 A1, Sep. 7, 2023
Int. Cl. F24F 11/88 (2018.01); H02J 3/38 (2006.01)
CPC H02J 3/381 (2013.01) [F24F 11/88 (2018.01); H02J 2300/24 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A photovoltaic power supply system, comprising:
a photovoltaic panel;
a DC bus;
a DC/DC converter, wherein one end of the DC/DC converter is connected to the photovoltaic panel and the other end of the DC/DC converter is connected to the DC bus; and
a switch assembly arranged in parallel with the DC/DC converter and configured to control a grid connection mode of the photovoltaic panel, wherein one end of the switch assembly is connected to the photovoltaic panel and the other end of the switch assembly is connected to the DC bus; and
an energy storage system having a state in operation and a state of not in operation, located between the DC/DC converter and the DC bus, arranged in parallel with the DC bus, and configured to supply power to the DC bus or store power from the DC bus, wherein;
the photovoltaic panel is connected to the DC bus through the DC/DC converter in response to the switch assembly is turned off, and the photovoltaic panel is directly connected to the DC bus in response to the switch assembly is turned on,
in response to the energy storage system is in operation and an output voltage of the photovoltaic panel is greater than a first preset voltage value, the switch assembly is turned off and the DC/DC converter is in bucking operation, wherein the first preset voltage value is a voltage value of the DC bus,
in response to the energy storage system is in operation and an output voltage of the photovoltaic panel is not greater than a first preset voltage value, the switch assembly is turned off and the DC/DC converter is in boosting operation, wherein the first preset voltage value is a voltage value of the DC bus,
in response to the energy storage system is not in operation and an output voltage of the photovoltaic panel is greater than a second preset voltage value, the switch assembly is turned on such that the photovoltaic panel is directly connected to the DC bus, wherein the second preset voltage value is a minimum voltage value driving a DC/AC converter to operate, and
in response to the energy storage system is not in operation and an output voltage of the photovoltaic panel is not greater than a second preset voltage value, the switch assembly is turned off and the DC/DC converter is in boosting operation, wherein the second preset voltage value is a minimum voltage value driving a DC/AC converter to operate.