Power system

A power system comprising: a group of power devices (10) comprising a power device; communication devices (100) connected to each other through a short-range communication network and connected to the power device; and a control / monitoring device (200) connected to the communication devices (100) in a wired manner, and transmitting and receiving status information and control data from the power device through the communication devices (100 ), where the communication devices (100) each comprise: a first communication unit (111) that connects the communication devices together through the short-range communication network and connected to the power device, and a second communication unit (112) connected to the control / monitoring device of wired manner, wherein the control / monitoring device (200) comprises: a communication unit (210) connected to each of the communication devices (100) in a wired manner; a storage unit (230) that stores information about each of the communication devices (100) and a retrieval command message according to a status of each of the communication devices (100); and a controller (220) that verifies the status of each of the communication devices (100) and the communication status of a wired communication line of each of the communication devices (100) and when one of the communication devices communication (100) is in an abnormal state, sending the recovery command message to one of the communication devices (100); wherein the communication devices (100) comprise a first communication device and a second communication device, and when the state of the first communication device (100) and the communication state of the wired communication line of the first communication device (100) are in the abnormal state, the controller (220) sends information related to the first communication device (100) in the abnormal state and the recovery command message to the second communication device (100) in the normal state and connected to the first communication device (100) in the abnormal state; and wherein the second communication device (100) transmits the recovery command message to the first communication device (100) in the abnormal state.