Neutral Current's Effect on Four-Wire Voltage Source Converter Control Systems

With the expansion of sustainable sources (e.g., solar and wind) in the energy matrix, the use of three-phase fourwire Voltage Source Converters (VSCs) enables the insertion of DC energy generated into AC electrical grids. The connection of single-phase loads in three-phase four-wire systems can generate negative- and zero-sequence components due to unbalanced voltage. This study examines the effects of neutral current on the control systems proportional-resonant controller of three-phase four-wire VSCs in the topology of the split-capacitor, in which the neutral conductor is connected to the midpoint. The modeling of the proposed topology, and simulation analysis will also be studied. The results from the simulation confirmed the analyzes carried out through the proposed modeling.