US 12,334,765 B2
Grid connection control method of energy storage apparatus, unit, system, and storage medium
Yanhua Lu, Shanghai (CN); Dongxu Yu, Shanghai (CN); and Bingtuan Luo, Shanghai (CN)
Assigned to CONTEMPORARY AMPEREX FUTURE ENERGY RESEARCH INSTITUTE (SHANGHAI) LIMITED, Shanghai (CN)
Filed by CONTEMPORARY AMPEREX FUTURE ENERGY RESEARCH INSTITUTE (SHANGHAI) LIMITED, Shanghai (CN)
Filed on Dec. 31, 2024, as Appl. No. 19/006,595.
Application 19/006,595 is a continuation of application No. PCT/CN2022/129263, filed on Nov. 2, 2022.
Prior Publication US 2025/0132583 A1, Apr. 24, 2025
Int. Cl. H02J 7/00 (2006.01); H02J 7/06 (2006.01)
CPC H02J 7/0048 (2020.01) [H02J 7/00032 (2020.01); H02J 7/0014 (2013.01); H02J 7/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A grid connection control method of an energy storage apparatus, wherein the energy storage apparatus comprises a plurality of energy storage sub-modules; the energy storage sub-module comprises a power unit and an energy storage unit; the power unit comprises a rectifying circuit and a voltage-sharing capacitor; the energy storage unit and the voltage-sharing capacitor are respectively connected in parallel with an output end of the rectifying circuit; the energy storage unit is capable of being connected to or disconnected from the output end of the rectifying circuit; input ends of all the rectifying circuits are connected in series to form a main energy transmission circuit; the main energy transmission circuit is capable of being connected to or disconnected from a direct-current bus of an electric power system; the method comprising:
in a state in which the main energy transmission circuit is disconnected from the direct-current bus, sequentially controlling the energy storage units of the energy storage sub-modules to be connected to corresponding voltage-sharing capacitors, so as to make the energy storage units pre-charge the corresponding voltage-sharing capacitors; and
controlling the main energy transmission circuit to be connected to the direct-current bus under a condition that the voltage-sharing capacitor of each energy storage sub-module meets a voltage-sharing capacitor pre-charge completion condition.