US 12,348,127 B2
Power conversion device
Takuya Kajiyama, Tokyo (JP); Toshiyuki Fujii, Tokyo (JP); Shuhei Fujiwara, Tokyo (JP); Yoshiyuki Kono, Tokyo (JP); and Ryosuke Uda, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/259,801
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jan. 15, 2021, PCT No. PCT/JP2021/001251
§ 371(c)(1), (2) Date Jun. 29, 2023,
PCT Pub. No. WO2022/153483, PCT Pub. Date Jul. 21, 2022.
Prior Publication US 2024/0072642 A1, Feb. 29, 2024
Int. Cl. H02M 1/32 (2007.01); H02J 3/26 (2006.01); H02J 3/36 (2006.01); H02J 3/00 (2006.01); H02M 7/219 (2006.01); H02M 7/483 (2007.01)
CPC H02M 1/325 (2021.05) [H02J 3/36 (2013.01); H02J 3/001 (2020.01); H02J 3/26 (2013.01); H02M 7/219 (2013.01); H02M 7/4835 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A power conversion device comprising:
a power converter connected between a multi-phase alternating-current circuit and a direct-current circuit; and
a control device to control the power converter, wherein
the control device
detects an unbalanced component indicating a voltage unbalanced component or a current unbalanced component of the alternating-current circuit,
performs a control operation so as to cause the unbalanced component to follow an unbalanced component command value,
sets a limit value for limiting a magnitude of an alternating current flowing between the power converter and the alternating-current circuit, based on a result of the control operation,
decreases the alternating-current in accordance with the limit value that is set in a case where the unbalanced component is larger than the unbalanced component command value, and
increases the alternating-current in accordance with the limit value that is set in a case where the unbalanced component is smaller than the unbalanced component command value.