US 12,413,070 B2
Direct-current bus control system
Katsuhiko Tsuno, Saitama (JP); Katsushi Fujii, Saitama (JP); Kayo Koike, Saitama (JP); and Satoshi Wada, Saitama (JP)
Assigned to RIKEN, Saitama (JP)
Filed by RIKEN, Saitama (JP)
Filed on Jun. 7, 2024, as Appl. No. 18/737,050.
Application 18/737,050 is a continuation of application No. PCT/JP2022/045490, filed on Dec. 9, 2022.
Claims priority of application No. 2021-201141 (JP), filed on Dec. 10, 2021.
Prior Publication US 2024/0322564 A1, Sep. 26, 2024
Int. Cl. H02J 1/04 (2006.01); H02J 1/12 (2006.01); H02J 7/35 (2006.01)
CPC H02J 1/12 (2013.01) [H02J 1/04 (2013.01); H02J 7/35 (2013.01); H02J 2207/20 (2020.01); H02J 2300/24 (2020.01); H02J 2300/28 (2020.01); H02J 2300/30 (2020.01)] 10 Claims
OG exemplary drawing
 
1. A direct-current bus control system for controlling power variation in a DC bus connecting an input power source and a load, the direct-current bus control system comprising:
a main stabilizer including a first charge/discharge element and a first power converter; and
a plurality of sub-stabilizers each including a second charge/discharge element, a charge element, or a discharge element, and a second power converter,
wherein the first power converter is configured to obtain a bus voltage target value corresponding to a power storage quantity index of the first charge/discharge element, and to cause the first charge/discharge element and the DC bus to bidirectionally transmit or receive a DC power to or from each other such that a voltage of the DC bus becomes equal to the bus voltage target value,
the second power converter is configured to obtain a current target value in accordance with a difference between the voltage of the DC bus and a threshold regarding charging or discharging of the second charge/discharge element, the charge element, or the discharge element, and to cause the second charge/discharge element, the charge element, or the discharge element and the DC bus to transmit or receive a DC power to or from each other such that a current equal to the current target value flows through the second charge/discharge element, the charge element, or the discharge element,
the plurality of sub-stabilizers include a first sub-stabilizer and a second sub-stabilizer including the charge element,
the second power converter of the first sub-stabilizer is configured to supply the current equal to the current target value obtained by the second power converter of the first sub-stabilizer from the DC bus to the charge element of the first metal-stabilizer when the voltage of the DC bus is higher than a first charge threshold, and
the second power converter of the second sub-stabilizer is configured to stop supplying a current from the DC bus to the charge element of the second sub-stabilizer or to supply a constant current from the DC bus to the charge element of the second sub-stabilizer regardless of the voltage of the DC bus when the voltage of the DC bus is higher than the first charge threshold and lower than a second charge threshold that is higher than the first charge threshold, and to supply the current equal to the current target value obtained by the second power converter of the second sub-stabilizer from the DC bus to the charge element of the second sub-stabilizer when the voltage of the DC bus is higher than the second charge threshold.