US 12,261,447 B2
On-grid/off-grid scheduling method and apparatus, and energy storage power supply system
Weijin Li, Guangdong (CN); and Yunhong Zeng, Guangdong (CN)
Assigned to Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Appl. No. 18/016,152
Filed by Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
PCT Filed Sep. 8, 2021, PCT No. PCT/CN2021/117139
§ 371(c)(1), (2) Date Jan. 13, 2023,
PCT Pub. No. WO2022/142452, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 202011640870.7 (CN), filed on Dec. 31, 2020.
Prior Publication US 2023/0283082 A1, Sep. 7, 2023
Int. Cl. H02J 3/38 (2006.01); H02J 3/32 (2006.01)
CPC H02J 3/388 (2020.01) [H02J 3/32 (2013.01); H02J 3/381 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An on-grid/off-grid scheduling method, applied to an energy storage power supply system which comprises an energy storage device connected to a DC bus, one end of the DC bus being connected to a power grid through an AC-DC module, and the other end being connected to a load, the scheduling method comprising:
obtaining a startup duration of the AC-DC module, wherein an output of the AC-DC module is stable after elapse of the startup duration;
determining a first preset duration interval according to the startup duration, wherein the first preset duration interval is greater than the startup duration;
controlling an output voltage of the energy storage device to drop once every the first preset duration interval, after the energy storage device enters an off-grid operation mode; and
obtaining a change situation of an input voltage of the load after the output voltage of the energy storage device each time is controlled to drop and determining whether to control the energy storage device to switch to an on-grid operation mode according to the change situation of the input voltage of the load, comprising:
determining to control the energy storage device to switch to the on-grid operation mode if the input voltage of the load does not drop, and
determining to control the energy storage device to remain in the off-grid operation mode and controlling the output voltage of the energy storage device to return to a value of the output voltage before being dropped if the input voltage of the load drops,
wherein in the off-grid operation mode, the power grid stops supplying power, and the energy storage device supplies power to the load, and
wherein in the on-grid operation mode, both the power grid and the energy storage device supplies power to the load.