The integration of a flywheel as a power handling can increase the energy storage capacity and reduce the number of battery\r\ncharge/discharge cycles. Furthermore, the ability of recovering energy of the vehicle during breaking can increase the system\r\nefficiency. The flywheel-based all-electric driveline investigated here has its novelty in the use of a double-wound flywheel\r\nmotor/generator, which divides the system in two different voltage levels, enhancing the efficiency of the electric driveline.\r\nThe connection of two AC electrical machines (i.e., the flywheel and the wheel motor) with different and variable operation\r\nfrequency is challenging. A power matching control applied to an AC/DC/AC converter has been implemented. The AC/DC/AC\r\nconverter regenerates the electric power converted during braking to the flywheel machine, used here as power handling device.\r\nBy controlling the power balance, the same hardware can be used for acceleration and braking, providing the reduction of\r\nharmonics and robust response. A simulation of the complete system during braking mode has been performed both in Matlab\r\nand Simulink, and their results have been compared. The functionality of the proposed control has been shown and discussed,\r\nwith full regeneration achieved. A round-trip efficiency (wheel to wheel) higher than 80% has been obtained.
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