Integration Of Solar Pv With Battery Storage Via A Novel Three-Level Npc Inverter Configuration With Advanced Control Method

Abstract

This paper unique three-level Neutral Point Clamped (NPC) inverter design that integrates solar photovoltaic (PV) with battery storage systems in a grid-connected configuration. The proposed architecture leverages an innovative extended unbalanced three-level vector modulation technique, enabling it to maintain proper AC voltage output even under unbalanced DC voltage conditions, which is a common issue in multilevel inverter operations. The study elaborates on the theoretical underpinnings and design philosophy of this modulation strategy, highlighting its ability to decress Total Harmonic Distortion (THD), enhance voltage balancing, and improve system efficiency. novel control algorithm is introduced to regulate power distribution dynamically among the solar PV array, battery storage, and the utility grid. This algorithm simultaneously Maximum Power Point Tracking (MPPT) for the solar PV to maximize energy generation during changing solar irradiance while managing the battery’s State of Charge (SOC) to maintain optimal charge-discharge cycles. The control strategy facilitates seamless integration with the grid, supports bidirectional power flow, and enhances the reliability and Balance of the entire system. Simulation results validate the impact of the proposed configuration and control method, demonstrating increase’s power quality, reduced switching losses, and reliable operation under dynamic load and environmental conditions. This integrated system is ideal for modern distributed generation applications, promoting clean energy utilization and supporting grid stability with advanced inverter-based technologies.