[KAJIWARA Shinsuke 梶原　慎介, KISAKI Mio 木▲崎▼　美桜, AKIYAMA Taiga 秋山　大河, SUESHIMA Satoshi 末島　賢志, HORIBE Takeshi 堀部　武史, IKEDA Kazumasa 池田　和正] 2-1, Kurosaki-Shiroishi, Yahatanishi-ku, Kitakyushu-shi, Fukuoka 〒8060004 福岡県北九州市八幡西区黒崎城石２番１号 Fukuoka8060004 A power conversion system 1 comprises: a plurality of power conversion devices 20; and a master controller 10 capable of communicating with the plurality of power conversion devices 20 by a serial communication channel CS01. The master controller 10 transmits the same control command to the plurality of power conversion devices 20 by serial communication via the serial communication channel CS01, and the plurality of power conversion devices 20 each perform power conversion from the primary side to the secondary side on the basis of the same control command.