MICROGRID CONTROL SYSTEM, CONTROL METHOD OF MICROGRID, AND INTELLIGENT ELECTRONIC DEVICE

A microgrid control system includes: a first intelligent electronic device to detect an open/closed state of a switch coupling a microgrid and a higher-ordered system; a protection relay to disconnect a consumer from the microgrid when detecting a fault current; and a second intelligent electronic device including protection relay-controlling circuitry to apply, to the protection relay, a set value according to at least the open/closed state of the switch, wherein the protection relay detects the fault current using the set value applied by the second intelligent electronic device.