Abstract: In the application of medium voltage motor drives, the modular multilevel converter (MMC) requires large-size capacitance to mitigate ripple power in its submodule (SM), resulting in reduced power density. A high-frequency link interconnection MMC (HFL-MMC) topology is proposed, which connects the three-phase SM at the same horizontal position through a high-frequency link (HFL) and decouples ripple power based on the symmetry of fluctuating current of the three-phase SM. This effectively suppresses voltage fluctuations of the SM, greatly reducing the volume of SM capacitors. Furthermore, the 2^nd-order frequency circulating currents in arms are also eliminated. This paper presents the system configuration and ripple-power decoupling principle of the HFL-MMC. The working process and mode of the interconnected high-frequency link in this topology are analyzed in detail, along with its ripple-power decoupling characteristics and zero-voltage-switching (ZVS) characteristics within conventional engineering hardware parameters. Furthermore, an evaluation is conducted on the power density, efficiency, and cost of both this topology and traditional MMC. Finally, the HFL-MMC motor drive system is verified through simulation and experimentation.