A modified deadbeat control for single-phase voltage-source PWM inverters based on asymmetric regular sample

This paper proposed a new digital multiple feedback control for uninterruptible power supply (UPS) with single-phase half-bridge inverter. The control scheme is based on sensing the voltage of the filter´s capacitor and load current. A state observer is used to predict the capacitor current. Thus, current deadbeat control can be achieved, which is easy to be deduced by a discrete state equation of the LC filter. Then an outer voltage feedback loop is also used to ensure load voltage to be sinusoidal and well regulated. It is shown that the control scheme which is simple and can be designed easily offers improved performance over the traditional deadbeat control especially with nonlinear load. Simulation and experimental results based on TMS320F240 (DSP) proved it