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This paper presents a digital control for the inverter stage of uninterruptible power supplies (UPSs) for nonlinear and unbalanced load in order to obtain dynamic response. It has been developed a space vector pulse wide modulation (SVPWM) for a three phase 4 wire inverter for current control. Moreover, a multiloop structure digital control was using to implementation, based on dead beat control algorithm. Finally, the control system on the dq0 frame decouples the dq0 components. Simulation results for various operation conditions are presented to verify the validity of the control method.