Power Supply System, Power Supply Method, Control Apparatus, and Computer Storage Medium

A power supply system includes a plurality of parallelly-connected uninterruptible power supplies (UPSs), where each UPS collects a first current of the UPS within a collection period in a first duration. In a current equalization period in the first duration, a direct current to alternating current conversion module is controlled to output a first compensation current, where the first compensation current includes at least one of a first compensation reactive current component or a first quantity of first compensation harmonic components.