US 12,176,707 B2
DC bus control system
Katsuhiko Tsuno, Wako (JP); Katsushi Fujii, Wako (JP); Kayo Koike, Wako (JP); and Satoshi Wada, Wako (JP)
Assigned to RIKEN, Wako (JP)
Appl. No. 18/011,942
Filed by RIKEN, Wako (JP)
PCT Filed May 10, 2021, PCT No. PCT/JP2021/017714
§ 371(c)(1), (2) Date Dec. 21, 2022,
PCT Pub. No. WO2021/261094, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-107092 (JP), filed on Jun. 22, 2020.
Prior Publication US 2023/0208134 A1, Jun. 29, 2023
Int. Cl. H02J 1/12 (2006.01); H02J 7/00 (2006.01); H02J 7/35 (2006.01)
CPC H02J 1/12 (2013.01) [H02J 7/0013 (2013.01); H02J 7/35 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A DC bus control system for controlling power fluctuations in a DC bus connecting an input power source and a load, the DC bus control system comprising:
a main stabilization device including a first charging/discharging element and a first power converter;
a plurality of the sub stabilization devices each including a second charging/discharging element, a charging element, or a discharging element and a second power converter, wherein
the first power converter is configured to obtain a bus voltage target value and transmit and receive DC power bidirectionally between the first charging/discharging element and the DC bus such that a voltage of the DC bus matches the bus voltage target value,
the second power converter is configured to obtain a current target value according to a difference between a threshold value regarding charging or discharging of the second charging/discharging element, the charging element or the discharging element and the voltage of the DC bus, and to transmit and receive DC power between the second charging/discharging element, the charging element or the discharging element, and the DC bus such that a current equal to the current target value flows to the second charging/discharging element, the charging element or the discharging element,
the plurality of the sub stabilization devices includes a first sub stabilization device having a charging/discharging element and a second power converter and at least one second sub stabilization device having a charging element or a discharging element and a second power converter,
a response speed of the first sub stabilization device is set such that a charging amount of the charging element or a discharging amount of the discharging element of the second sub stabilization device changes with a predetermined time constant, and
the first charging/discharging element of the main stabilization device and the second charging/discharging element of the first sub stabilization device are substantially equal in time constant.