Model Predictive Current Controller for Grid Connected Photovoltaic System Based on Four-Leg Inverter

This paper conducts an analysis of the Finite Set Model Predictive Control (FS-MPC) approach as it is applied to a three-phase four-leg converter in conjunction with a pho-tovoltaic system connected to a distributed system. Residential areas receive their power supply from a delta/wye-connected distribution transformer featuring a grounded neutral conductor, which establishes a three-phase four-wire distribution system. Typically, the loads in a low voltage distributed system are single-phase and unbalanced, potentially leading currents into the neutral that could overload the neutral conductor. The control strategy ensures sinusoidal currents with a high power factor while reducing the neutral current within the system. Simulations and experimental results are included to validate the efficacy of the proposed control strategy,