Improved Control Method for Combining a Multi-Level Based Inverter with Neutral-Point-Clamped Configuration Using PV and Battery Storage

In this work, a multi-level based neutral-point-clamped (NPC) inverter is recommended for grid-connected solar photovoltaic (PV) system and battery storage. For a three-phase, three-level inverter, a new and streamlined space vector pulse-width modulation (PWM) method is suggested. Compared to two-level inverters, three-level inverters have more switching states. A three-level space vector PWM inverter is directly applied in the suggested manner. This control approach incorporates maximum power point tracking (MPPT) technology and controls the flow of power in between the grid and the solar PV system. By using a vector modulation technique, the control architecture can produce precise AC voltage in situations when the DC voltage is imbalanced. Additionally, it controls the battery storage system’s charging and discharging under various solar irradiation levels. A MATLAB platform is used to simulate and check the effectiveness of space vector modulated three-phase, multi-level inverter.