US 12,126,174 B2
Energy storage system and control method
Yukitaka Monden, Kawasaki Kanagawa (JP); Shuji Yamazaki, Yokohama Kanagawa (JP); and Takenori Kobayashi, Tokyo (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Energy Systems & Solutions Corporation, Kawasaki (JP)
Appl. No. 17/769,319
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki Kanagawa (JP)
PCT Filed Oct. 15, 2019, PCT No. PCT/JP2019/040524
§ 371(c)(1), (2) Date Apr. 14, 2022,
PCT Pub. No. WO2021/074976, PCT Pub. Date Apr. 22, 2021.
Prior Publication US 2024/0128755 A1, Apr. 18, 2024
Int. Cl. H02J 3/32 (2006.01); H02J 7/00 (2006.01); H02J 7/34 (2006.01)
CPC H02J 3/32 (2013.01) [H02J 7/00712 (2020.01); H02J 7/34 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An energy storage system that includes first and second power storage devices and a control system, and is configured to perform charge/discharge control for the first power storage device and the second power storage device based on a charge/discharge command value, the first power storage device being configured to perform discharging for one or more devices serving as a power supply destination via a power line or perform charging of power supplied from one or more devices serving as a power supply source via the power line, and the second power storage device being connected to the first power storage device via the power line and configured to perform charging and discharging for the first power storage device,
the first power storage device outputting a charging rate signal corresponding to a charging rate of the first power storage device, and
the control system being configured to:
limit charge/discharge power for the first power storage device by the second power storage device to fall within a predetermined limit range, and control charge/discharge power for the first power storage device by the second power storage device based on the charging rate signal so that a power storage rate of the first power storage device remains within a predetermined power storage rate range while continuing charging and discharging based on the charge/discharge command value by the first power storage device; and
control charge/discharge power of the first power storage device based on charge/discharge power corresponding to the charge/discharge command value.
 
5. A control method performed in an energy storage system that includes a first power storage device and a second power storage device and is configured to perform charge/discharge control for the first power storage device and the second power storage device based on a charge/discharge command value, the first power storage device being configured to perform discharging for one or more devices serving as a power supply destination via a power line or perform charging of power supplied from one or more devices serving as a power supply source via the power line, and the second power storage device being connected to the first power storage device via the power line and configured to perform charging and discharging for the first power storage device, the method comprising:
detecting a charging rate of the first power storage device;
limiting charge/discharge power for the first power storage device by the second power storage device to fall within a predetermined limit range;
controlling charge/discharge power for the first power storage device by the second power storage device based on the detected charging rate of the first power storage device so that a power storage rate of the first power storage device remains within a predetermined power storage rate range while continuing charging and discharging based on the charge/discharge command value; and
controlling charge/discharge power of the first power storage device based on charge/discharge power corresponding to the charge/discharge command value.