The method of controlling a power supply system and a power supply system

The present invention discloses a method for controlling a power supply system and a power supply system, wherein the power supply system comprising: a first alternating current source and a second alternating current source; circuit switch module; controllable AC / DC conversion module is electrically coupled to the circuit switch module , for converting AC power line to DC power output from the switching module; post-stage power supply module is electrically coupled to a controllable AC / DC conversion module, configured to controllable AC / DC conversion module DC output required by the load is converted into electrical signal; and a control module electrically coupled to the circuit switch module and a controllable AC / DC conversion module for receiving a first alternating current source and the second operating state signal alternating current source, and a first and second alternating current source wherein the alternating current source working properly when a failure occurs, the control module switches the switching circuit to an AC source of a first source and a second alternating current source AC which further working. Using the power supply system and control method provided by the invention, can reduce costs and improve reliability.