Power supply system and control device

A power supply system comprising:

• a plurality of power conversion devices;
• and a plurality′ of breakers respectively connected to the plurality′ of power conversion devices and configured to perform switching of an electrical connection between the power conversion device and a power system, wherein the breaker switches an ON state and an OFF state, wherein a connection of the plurality of breakers is switched so that the number of the power conversion devices in a standby state does not reach a predetermined number, wherein, when the number of the power conversion devices in the standby state is the predetermined number, harmonic components flowing from the power system side are amplified due to the resonance in the power conversion device.

A control device comprising:

• a connection terminal connected to a plurality of breakers, the breakers being respectively connected to a plurality of power conversion devices and configured to perform switching of an electrical connections between the power conversion device and a power system, wherein the breaker switches between an ON state and an OFF state;
• and a controller configured to control the plurality of breakers via the connections terminal and switch connection states of the plurality of power conversion devices, and determine whether or not the number of the power conversion devices in a standby state reaches a predetermined number, wherein, when the number of the power conversion devices in the standby state is the predetermined number, harmonic components flowing from the power system side are amplified due to the resonance in the power conversion device.