This work presents the modeling, control, and simulation of a three-phase grid-connected hybrid renewable energy system integrating solar photovoltaic (PV), wind energy conversion (WECS), and battery energy storage (BESS). The system is developed in MATLAB/Simulink with a unified DC link regulated at 700 V to coordinate the power flow among all subsystems. The wind energy unit employs a 5.79 kW wind turbine coupled to a PMSG, followed by rectification and a P&O MPPT-controlled boost converter. The solar PV subsystem consists of a 7.5 kW array with an Incremental Conductance MPPT and dedicated boost stage. A bidirectional DC–DC converter manages battery charge/discharge based on DC-bus voltage and resource availability. Grid interaction is achieved through a three-phase inverter operating under dq-axis current control with PLL-based synchronization. Simulation scenarios involving variable irradiance (100–1000 W/m²), fluctuating wind speeds, and different load conditions validate the system’s capability to maintain DC-link stability, ensure smooth battery transitions, and enable controlled grid import/export operations. Results confirm efficient maximum power extraction, robust inverter control, and reliable hybrid energy coordination suitable for modern grid-connected renewable applications.