Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

In this paper, a grid-connected photovoltaic (PV) generation system is proposed with the purpose of providing support to low-voltage grids, namely through elimination or attenuation grid imbalances. This compensation must consider load types, which can be either linear non-linear, and whether reactive power current harmonics generated by non-linear loads need compensated in addition unbalanced active power. well considered, since all aspects requires oversized PV inverters. Thus, different schemes are addressed. Several for inverter references taking into consideration type presented. For system, dual four-leg, two-level proposed. It provides full owing fourth leg also extends AC voltage, important when required. To control inverter, scheme that considers several factors A vector voltage modulator associated controller another aspect addressed paper. balance between DC voltages verified computational tests. The results validate effectiveness system.