Flywheel energy storage system based on DC/DC converter with integrated magnetic structure

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 convertor, 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 proto type with 460-560V input and 320V output is produced. Through experimental analysis, the project has the advantages of less components, smaller size etc, and can reduce the current ripple effectively, will be suitable for high power applications.