Fault-tolerant control device and method for inverter in UPS system

The invention discloses a fault-tolerant control device and method for an inverter in a UPS system. The device comprises a Park transform module, a Clark transform module, a voltage prediction module,a PLL phase-locked loop module, a voltage compensation module, a value function module, a bus capacitor voltage offset calculation module, a three-phase four-switch inverter module and a load module,wherein the output end of the three-phase four-switch inverter module is sequentially connected with the voltage prediction module and the load module, one end of the Clark transform module is connected with the Park transform module, and the other end of the Clark transform module is connected with the voltage prediction module; the Park transform module is connected with the PLL phase-locked loop module and the value function module; the voltage compensation module is connected with the bus capacitor voltage offset calculation module and the value function module; and the output end of thevalue function module is co