US 12,267,022 B2
Power conversion device, power conversion method, and program
Toshihiro Hanada, Fukuoka (JP); Shoji Konakahara, Fukuoka (JP); Keisei Inoki, Fukuoka (JP); and Masashiro Tanaka, Fukuoka (JP)
Assigned to KABUSHIKI KAISHA YASKAWA DENKI, Fukuoka (JP)
Appl. No. 17/757,865
Filed by KABUSHIKI KAISHA YASKAWA DENKI, Fukuoka (JP)
PCT Filed Nov. 16, 2020, PCT No. PCT/JP2020/042672
§ 371(c)(1), (2) Date Jun. 22, 2022,
PCT Pub. No. WO2021/131398, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-238908 (JP), filed on Dec. 27, 2019.
Prior Publication US 2023/0032286 A1, Feb. 2, 2023
Int. Cl. H02M 5/293 (2006.01); H02M 1/00 (2007.01); H02M 5/275 (2006.01); H02M 5/297 (2006.01)
CPC H02M 5/2935 (2021.05) [H02M 1/0058 (2021.05); H02M 5/297 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A power conversion device, comprising:
a matrix converter circuit including a plurality of switching elements, the matrix converter circuit being configured to perform bidirectional power conversion between alternating current power on a primary side and alternating current power on a secondary side;
a power conversion control unit configured to switch on and off, in unison with a carrier wave, the plurality of switching elements to cause a voltage or a current on the secondary side to follow a control command; and
a carrier wave changing unit configured to change, based on a nearness level of a frequency of the voltage or the current on the secondary side to a frequency of a voltage on the primary side, a frequency of the carrier wave, wherein
the carrier wave changing unit changes the frequency of the carrier wave further based on a magnitude of the current on the secondary side,
a variable range of the magnitude of the current on the secondary side provided by the power conversion control unit includes a first current band and a second current band lower than the first current band,
when the magnitude of the current on the secondary side is within the second current band, the carrier wave changing unit does not perform changing the frequency of the carrier wave based on the nearness level, and
when the magnitude of the current on the secondary side is within the first current band, the carrier wave changing unit performs changing the frequency of the carrier wave based on the nearness level.