US 12,314,022 B2
Power management device, upper power management device, and power management method
Masao Ichi, Tokyo (JP); Shingo Suzuki, Tokyo (JP); Takuma Mitsunaga, Tokyo (JP); Katsuo Naoi, Tokyo (JP); and Hisakazu Uto, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Nov. 2, 2022, as Appl. No. 17/979,247.
Claims priority of application No. 2022-067019 (JP), filed on Apr. 14, 2022.
Prior Publication US 2023/0333529 A1, Oct. 19, 2023
Int. Cl. G05B 19/042 (2006.01); H02J 3/32 (2006.01); H02J 3/38 (2006.01)
CPC G05B 19/042 (2013.01) [H02J 3/32 (2013.01); H02J 3/381 (2013.01); G05B 2219/2639 (2013.01); H02J 2207/20 (2020.01); H02J 2300/20 (2020.01)] 9 Claims
OG exemplary drawing
 
1. A power management device comprising:
an acquisition unit configured to acquire an amount of stored electric power of a first power feeding system connected to a second power feeding system via an external direct current (DC) bus;
a control unit configured to switch an operation mode of the first power feeding system by controlling a converter, the converter being capable of bidirectionally converting between an external bus voltage supplied to the external DC bus and an internal bus voltage supplied to an internal DC bus for supplying DC electric power in the first power feeding system; and
a storage unit configured to store a plurality of power reception target values which are target values of the external bus voltage in the converter when electric power is transmitted from the second power feeding system to the first power feeding system and a plurality of power transmission target values which are target values of the external bus voltage in the converter when electric power is transmitted from the first power feeding system to the second power feeding system,
wherein the plurality of power reception target values are target values at which power transmission loss is minimized at different transmission power values,
wherein the plurality of power transmission target values are target values at which power transmission loss is minimized at different transmission power values,
wherein when the amount of stored electric power is less than a first storage threshold value, the control unit transmits a first power transmission request to an upper power management device that manages power transmission and reception between the first power feeding system and the second power feeding system, selects a first power reception target value corresponding to a first transmission power value in the first power transmission request from among the plurality of power reception target values, and sets the first power feeding system to a power reception mode by setting a target value of the external bus voltage to the first power reception target value, and
wherein when the amount of stored electric power exceeds a second storage threshold value that is larger than the first storage threshold value and the control unit receives a second power transmission request from the second power feeding system via the upper power management device, the control unit selects a first power transmission target value corresponding to a second transmission power value in the second power transmission request from among the plurality of power transmission target values, and sets the first power feeding system to a power transmission mode by setting the target value of the external bus voltage to the first power transmission target value.