CONTROL OF TWO STAGE PHOTOVOLTAIC SYSTEM FOR AC GRID

Abstract

This study presents a combined performance assessment of a two-stage power converter connected to a photovoltaic (PV) array with a battery energy storage system (BESS). Such a combination provides the controllability of PV storage plants, enhancing energy management and grid reliability. The system architecture comprises a DC-DC boost converter for stepping up the PV voltage and a 3-phase inverter for synchronized grid interfacing. A bidirectional DC-DC converter (BDC) is employed to control the charging and discharging of the battery, depending on real-time energy demand and generation. The control strategy focuses on maximizing PV output using a maximum power point tracking (MPPT) algorithm while maintaining a stable DC-link voltage. The battery supports load demands during low solar generation and stores surplus energy during peak production, ensuring a balanced power flow. Grid synchronization is achieved through a phase-locked loop (PLL). The results of the simulation confirm the successful implementation of the suggested system under dynamic environmental and load conditions. The integrated functioning of the solar system and battery improves energy efficiency, supports grid stability, and extends battery lifespan. This configuration proves to be a reliable and efficient solution for modern renewable energy applications.