Distribution STATCOM Integrated to a Single-Phase to Three-Phase Converter

This paper presents a single-phase voltage distribution static synchronous compensator which integrates a single-phase to three-phase four-wired transformer-less conversion. Beyond that, this structure are capable to interface a distributed alternative energy generation to the mains. The major advantage of this circuit is the combined operation capability, which is realized with a few switching components while preserve an interconnected grounded neutral from mains to three-phase terminals. The power electronic circuit is parallel connected to the single-phase grid and add two additional terminals, which together, form the three-phase four-wired grid. The resulting active power from the converter energy balance are absorbed/delivered from/to the mains while the reactive power are managed to provide its single-phase voltage compensation. The power system scheme as well as the proposed closed-loop control structure are presented in details. Simulation results are illustrated to validate the converter assembly.