Aiming at the DC power supply instability in micro-grid, a Flywheel Energy Storage System (FESS) based on magnetic integrated structure bidirectional DC/DC converter is proposed. In this system, for the converter, three magnetic elements (isolation transformer, resonant inductor and transformer) are integrated into a single core via magnetic integrated technology. The FESS can not only supply the energy shortfall of micro-grid, but also stabilize the voltage of DC bus, improve power quality and reliability. A DC/DC converter 10kW prototype with 460-560V input and 320V output is produced. Throu...