US 12,463,432 B2
PV-ESS direct connection type energy management system and photovoltaic power generation system interworking device
Inho Jung, Daejeon (KR); Jongcheol Kim, Daejeon (KR); Byeongho Mun, Daejeon (KR); and Hyeungil Jo, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/564,905
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Jan. 13, 2023, PCT No. PCT/KR2023/000655
§ 371(c)(1), (2) Date Nov. 28, 2023,
PCT Pub. No. WO2023/146176, PCT Pub. Date Aug. 3, 2023.
Claims priority of application No. 10-2022-0011267 (KR), filed on Jan. 26, 2022; and application No. 10-2023-0003808 (KR), filed on Jan. 11, 2023.
Prior Publication US 2024/0275171 A1, Aug. 15, 2024
Int. Cl. H02J 3/38 (2006.01); H02J 3/32 (2006.01); H02S 50/00 (2014.01); H02J 7/35 (2006.01)
CPC H02J 3/381 (2013.01) [H02J 3/32 (2013.01); H02S 50/00 (2013.01); H02J 7/35 (2013.01); H02J 2300/26 (2020.01); Y02E 10/56 (2013.01)] 15 Claims
OG exemplary drawing
 
9. An energy management system comprising:
a power management control device interworking with an energy storage system (ESS) and a photovoltaic (PV) system associated therewith and configured to determine whether the PV system is able to generate power based on external conditions; and
a PV re-combiner configured to disconnect the photovoltaic system from a direct current (DC) bus which is connected to DC power lines of the energy storage system and an inverter according to a control command from the power management control device,
wherein the PV re-combiner includes:
an inverter connection terminal connecting the photovoltaic system and the inverter;
an ESS connection terminal connecting the photovoltaic system and the energy storage system; and
a disconnector configured to disconnect the photovoltaic system and the DC bus according to the control command of the power management control device which is based on external conditions, and
wherein the DC bus directly connects the inverter connection terminal, the ESS connection terminal and the disconnector to each other,
wherein the photovoltaic system and the DC bus are connected in an instance that photovoltaic power generation is possible so that the energy management system operates in a first operation mode and the photovoltaic system and the DC bus is disconnected in an instance that photovoltaic power generation is impossible so that the energy management system operates in a second operation mode,
wherein, in the first operation mode, the inverter supplies power according to maximum power point tracking (MPPT) control and the energy storage system performs charging in a constant power (CP) mode, and
wherein, in the second operation mode, the energy storage system performs discharging in a constant voltage (CV) mode and the inverter supplies power in a constant power (CP) mode.