US 12,322,969 B2
Power conversion system
Shuhei Fujiwara, Tokyo (JP); Yoshiyuki Kono, Tokyo (JP); Ryosuke Uda, Tokyo (JP); Takuya Kajiyama, Tokyo (JP); and Toshiyuki Fujii, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/040,062
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Aug. 21, 2020, PCT No. PCT/JP2020/031677
§ 371(c)(1), (2) Date Jan. 31, 2023,
PCT Pub. No. WO2022/038780, PCT Pub. Date Feb. 24, 2022.
Prior Publication US 2023/0291327 A1, Sep. 14, 2023
Int. Cl. H02J 3/06 (2006.01); H02J 3/36 (2006.01); H02M 7/483 (2007.01)
CPC H02J 3/06 (2013.01) [H02J 3/36 (2013.01); H02M 7/4835 (2021.05); Y02E 60/60 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A power conversion system comprising:
a plurality of power conversion devices connected to a plurality of AC systems, respectively, the power conversion devices being further connected to a common DC circuit; and
a start-up device to start up each of the power conversion devices, wherein
the start-up device
selects an AC system that satisfies a defined condition relating to power supply capability from among the plurality of AC systems based on system information of the plurality of AC systems, and
starts up a power conversion device connected to the selected AC system,
the system information of the AC system includes an RMS voltage of the AC system, a voltage difference between the RMS voltage of the AC system and a reference RMS voltage, and a short-circuit capacity of the AC system, and
the start-up device
sets the defined condition to a first condition relating to the RMS voltage when the short-circuit capacity of each of the plurality of AC systems is equal to or higher than a defined capacity, and
sets the defined condition to a second condition relating to the voltage difference when at least one of a plurality of short-circuit capacities of the plurality of AC systems is lower than the defined capacity.