ENHANCED EFFICIENCY AND RIPPLE REDUCTION IN HYBRID PV SYSTEMS USING BATTERY CURRENT-SHARING POWER DECOUPLING

Abstract

Conventional single-stage grid-connected photovoltaic (PV) inverters require large electrolytic capacitors to suppress double-line frequency current ripple, ensuring operation at the maximum power point (MPP). However, the limited lifespan and reliability issues of electrolytic capacitors hinder the system's performance. To address this, a novel Battery Current-Sharing Power Decoupling (BCSPD) method is proposed, which connects a decoupling circuit in parallel with the string PV module, forming a single-stage topology. This reduces the required capacitance and allows the use of long-life film capacitors, significantly improving reliability and efficiency. The proposed BCSPD system is modelled and validated using MATLAB/Simulink, enabling detailed simulation and analysis of its components and behaviour. The PV system is designed with MPP tracking algorithms and integrates the BCSPD circuit, including bidirectional DC/DC converters, MOSFETs, and control algorithms. The battery storage system with droop control is also simulated to manage power regulation, stabilize grid voltage, and store excess energy. Simulations demonstrate the system's ability to minimize current ripple, reduce conversion losses, and enhance PV energy output. The use of MATLAB/Simulink facilitates system design, optimization, and validation, providing a scalable and reliable solution for hybrid PV systems. This approach ensures the system meets realworld application requirements and accelerates advancements in sustainable energy technologies.