Sorting Selection Balancing Control for the Modular Multilevel DC/DC Converter in Battery Swapping Stations

In this paper, a modular multilevel DC/DC converter (MMDDC) is used to integrate the electric vehicle power battery packs for the battery swapping station (BSS) to save the cost of a large number of power conversion systems and prevent the circulating currents in the traditional BSS. A sorting selection balancing control scheme is then proposed to realize battery packs hot-swapping and states-of-charge balancing at the same time. An MMDDC prototype with 16 SMs is built to verify the proposed method.