A new digital multiple feedback control strategy for single-phase voltage-source PWM inverters

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 current and voltage of the of the filter's capacitor. Thus current deadbeat control is achieved, which is easy to be deduced by discrete state equation of the LC filter. Then an outer voltage feedback loop with fuzzy control is also used to ensure load voltage to be sinusoidal and well regulated. It is shown 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.