US 12,334,738 B2
Power conversion device and estimation device
Masahiro Hario, Tokyo (JP); and Noriyuki Imada, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/252,235
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 17, 2020, PCT No. PCT/JP2020/042828
§ 371(c)(1), (2) Date May 9, 2023,
PCT Pub. No. WO2022/107214, PCT Pub. Date May 27, 2022.
Prior Publication US 2024/0014661 A1, Jan. 11, 2024
Int. Cl. H02J 3/36 (2006.01); H02J 3/01 (2006.01); H02J 3/24 (2006.01); H02J 3/18 (2006.01); H02J 3/38 (2006.01); H02M 7/68 (2006.01)
CPC H02J 3/36 (2013.01) [H02J 3/24 (2013.01); H02J 3/01 (2013.01); H02J 3/18 (2013.01); H02J 2003/365 (2013.01); H02J 3/38 (2013.01); H02M 7/68 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A power conversion device included in a self-excited DC power transmission system connected to an AC system, the power conversion device comprising:
a self-excited converter to perform power conversion between the AC system and a DC system; and
a control device to control operation of the self-excited converter, wherein
the control device includes a storage to store first vibration information and a first control parameter of the self-excited converter in association with each other for each of a plurality of pieces of first vibration information,
the first vibration information includes a first vibration component included in an AC voltage of the AC system,
the first control parameter associated with the first vibration information is a parameter preventing the first vibration component, and
the control device includes
a vibration detector to detect a vibration component of an AC voltage of the AC system,
a determination unit to determine whether first similar vibration information similar to first detected vibration information including the vibration component of the AC voltage of the detected AC system exists in the plurality of pieces of first vibration information stored in the storage, and
a setting unit to set the first control parameter associated with the first similar vibration information as a new control parameter of the self-excited converter when the first similar vibration information exists,
wherein, when the vibration component is detected in the AC system by the vibration detector after the new control parameter is set, the setting unit changes the new control parameter according to a predetermined expression.