<p>PURPOSE: A microgrid system is provided to perform stable system operation by controlling a cooperation of first and second energy control devices. CONSTITUTION: A first energy storage device(10) is operated in an output control mode. A second energy storage device(20) is operated in the output control mode. The second energy storage device is connected between the first energy storage device and a load(30). The first energy storage device comprises a battery energy storage system (BESS). The second energy storage device comprises a super-capacitor. [Reference numerals] (40) First filter; (50) Second filter</p>
