MODULAR UPS AND WORKING METHOD OF MODULAR UPS

The present invention discloses a modular UPS and a working method of a modular UPS and relates to the electric power field, to fully utilize power modules in a modular UPS, and improve system performance. The method includes: obtaining working parameters of a modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2 ≤ K. The present invention is used for power supply of a UPS.