Utility interactive two-switch edge-resonant dc link snubber-assisted three-phase V-connection soft switching sinewave inverter with two quadrant soft switching chopper

This paper presents a novel proposal of the utility ac interactive three-phase soft commutation sinewave PWM power conditioner developed for solar photovoltaic power generation system and parallel processing uninterruptible power supply with new type battery and super capacitor energy storage devices. The prototype of this power conditioner is composed of a single two-switch auxiliary resonant dc link snubber incorporating into one leg with two divided capacitors of three-phase V-connection inverter legs, two quadrant soft switching PWM chopper with step-up and step-down voltage operating modes and the three-phase utility ac power source. The operating principle of the proposed power conversion conditioning circuit and system is described and discussed based upon unique design of a single high-frequency soft switching sinewave PWM scheme for both the chopper and the three-phase V-connection inverter. The operating performances such as the waveform quality and the actual efficiency of the cost effective utility interactive power conversion conditioning and processing circuit treated here are evaluated and discussed on the basis of experimental data.