A three-phase grid-connected photovoltaic (PV) wind battery system in MATLAB refers to a renewable energy setup designed to generate electricity from solar panels, wind turbines, and batteries, and connect it to the electrical grid. MATLAB is a programming platform commonly used for simulating and analyzing complex systems like power grids. In this context, the system integrates multiple sources of renewable energy to supply power to the grid while also incorporating battery storage for energy storage and management. MATLAB enables engineers and researchers to model and analyze the system's performance, including power generation, grid interaction, and battery charging and discharging dynamics, allowing for optimization and efficiency improvements in renewable energy integration.