Power conditioning system that stabilizes power quality of solar power generation systems and enables grid interconnection. In addition to inverter function that converts DC power generated by solar panels to AC, it incorporates voltage/frequency regulation, harmonic suppression, and grid protection functions. Realizes stable power supply and power quality maintenance in rooftop solar power generation and self-consumption systems at manufacturing facilities. Available in single-phase and three-phase models with various output capacity lineups, enabling optimal selection according to factory power demand. Combined with grid interconnection protection device (RPR), it also performs reverse power flow control to commercial power grid.