POWER SUPPLY SYSTEM AND POWER SUPPLY METHOD

The disclosure discloses a power supply system and a power supply method. The power supply system includes a first sub-system including at least two first power supply devices and a first load, the first power supply devices for powering the first load; a second sub-system including a second power supply device and a second load, the second power supply device for powering the second load; and a connection unit configured to control electrical connection or electrical disconnection between the first power supply devices and the second load; wherein power supply availability of the first sub-system is higher than power supply availability of the second sub-system. The disclosure provides more power supply availabilities through few types of power supply structures, which facilitates application scenarios such as data center to flexibly adjust the power supply structures according to business, and save cost.