In modular uninterruptible power supplies (UPSs), several DC/AC modules are required\nto work in parallel. This structure allows the system to be more reliable and flexible. These DC/AC\nmodules share the same DC bus and AC critical bus. Module differences, such as filter inductor,\nfilter capacitor, control parameters, and so on, will make it possible for the potential zero sequence\ncurrent to flow among the modules. This undesired type of circulating current will bring extra losses\nto the power semiconductor devices in the system, which should be paid special attention in high\npower application scenarios. In this paper, plug�n�play modules and cycle control are discussed and\nvalidated through experimental results. Moreover, potential zero sequence circulating current impact\non power semiconductor devices thermal performance is also analyzed in this paper.
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