Power conversion system including power conversion devices and a master controller for performing power conversion based on a same control command

A power conversion system, comprising:

• a plurality of power conversion devices;
• and
• a master controller that communicates with the plurality of power conversion devices via a serial communication system, wherein
• the master controller transmits a single control command to the plurality of power conversion devices by serial communication via the serial communication system,
• each of the plurality of power conversion devices performs power conversion from a primary power to a secondary power based on the single control command,
• the master controller further communicates with a second master controller via a second serial communication system, and
• the master controller:
• switches an operation mode between a primary mode and a secondary mode,
• in the primary mode, transmits the single control command to the plurality of power conversion devices by serial communication via the serial communication system and transmits the single control command to the second master controller by serial communication via the second serial communication system, and
• in the secondary mode, receives the single control command from the second master controller by serial communication via the second serial communication system and transmits the single control command to the plurality of power conversion devices by serial communication via the serial communication system.