US 12,463,430 B2
Energy storage system and method for controlling grounding structure of energy storage system
Byeongho Mun, Daejeon (KR); Jongcheol Kim, Daejeon (KR); Inho Jung, Daejeon (KR); and Hyeungil Jo, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/280,360
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Oct. 4, 2022, PCT No. PCT/KR2022/014892
§ 371(c)(1), (2) Date Sep. 5, 2023,
PCT Pub. No. WO2023/113169, PCT Pub. Date Jun. 22, 2023.
Claims priority of application No. 10-2021-0181167 (KR), filed on Dec. 17, 2021.
Prior Publication US 2024/0154423 A1, May 9, 2024
Int. Cl. H02J 3/38 (2006.01); G01R 31/52 (2020.01); H02J 3/00 (2006.01); H02J 7/00 (2006.01); H02J 7/35 (2006.01)
CPC H02J 3/38 (2013.01) [H02J 3/001 (2020.01); H02J 7/0013 (2013.01); H02J 7/0047 (2013.01); H02J 7/35 (2013.01); G01R 31/52 (2020.01); H02J 2207/20 (2020.01); H02J 2300/24 (2020.01)] 21 Claims
OG exemplary drawing
 
1. An energy storage system including a photovoltaic system and a battery system and connected with a power grid, the energy storage system comprising:
a power conversion system configured to be connected with the power grid and selectively connected to at least one of the photovoltaic system and the battery system;
a first switch selectively connecting the photovoltaic system and a direct current (DC) link of the power conversion system;
a second switch selectively connecting the battery system and the DC link of the power conversion system;
a controller configured to control a ground structure of at least one of the photovoltaic system, the battery system, and the power conversion system by controlling the first switch and the second switch based on a state of the photovoltaic system and a state of the battery system; and
a first ground fault detector configured to detect a ground fault of the photovoltaic system,
wherein the first ground fault detector is selectively connected to negative terminals of the photovoltaic system through a third switch being in a closed state.