Utility-interactive three-phase soft-switching pulse width modulated converter with active resonant snubbers in bridge leg sides for energy storage devices

In this paper, a prototype of a multi-functional controlled three-phase voltage-source bidirectional zero voltage soft-switching PWM converter with three auxiliary active resonant commutated snubber link (ARCS) is presented for battery and/or electric double layer capacitor energy storage system (BESS). The operating principle of this active resonant snubber-assisted soft-switching converter circuit for BESS and multi-functional digital control-based converter system including active rectifier and inverter operation modes are described. Operation characteristics of this bidirectional three phase soft-switching space voltage vector modulated converter with ARCS for BESS is demonstrated under the conditions of battery discharging-based peak-cut mode and battery charging-based energy storage mode in with conventional utility three phase hard-switching converter for BESS. The effectiveness of the converter system is proved on the basis of simulation analysis