DESIGN AND DEVELOPMENT OF SOLAR GRID INTERFACED SYSTEM AND THEIR APPLICATIONS TO EV CHARGING INFRASTRUCTURE

Abstract

This study uses surplus electricity from renewable energy sources and power networks with extra capacity to provide a unique and integrated method to high-efficiency battery charging systems. The suggested technique reduces reliance on the central grid while permitting optimal battery charging and discharging by using self-tuning filters (STFs) to obtain undistorted fundamental load current. Through adaptive charging procedures, this technique not only increases the use of renewable energy but also prolongs battery life by intelligently managing extra power. We develop and analyse a power conversion system based on an interleaved totem-pole converter with power factor correction (PFC) enabled, followed by a full-bridge LLC resonant converter, to support this strategy. This dual-stage architecture combines the high-efficiency soft-switching properties of the LLC stage with the near-unity power factor and decreased input current ripple benefits of the totem-pole PFC stage. The combined system is designed for uses including grid-integrated renewable storage systems and electric vehicle (EV) charging that need for small, high-performance AC-DC power conversion. For both converter stages, a thorough analysis of component selection, control schemes, and operating principles is given. The effectiveness of the suggested system is validated by simulation results, which show good efficiency throughout a broad input voltage and load range. Possible directions for further study are also noted, such as the system's scalability for larger-scale implementations and interaction with cutting-edge energy management platforms. All things considered, this work presents a potential path for intelligent, efficient, and sustainable power conversion in next-generation energy infrastructure.