30 MW grid-connected photovoltaic (PV) system in MATLAB Simulink

This work presents the modelling and simulation of a 30 MW grid-connected photovoltaic (PV) system incorporating a Perturb and Observe (P&O) MPPT algorithm using MATLAB/Simulink. The study focuses on delivering stable power to an 11 kV utility grid, even under dynamically varying irradiation conditions. The PV array, rated at 30 MW with 5000 V and 6000 A output, is interfaced through a boost converter that regulates the DC-link voltage at 20 kV. A three-phase inverter employing dq0-based current control ensures unity power factor operation and high-quality grid injection. Simulation results confirm effective MPPT tracking, rapid response to irradiance fluctuations, and consistent sinusoidal grid currents. The system achieves a Total Harmonic Distortion (THD) of approximately 0.8%, well below IEEE-519 limits, demonstrating excellent inverter performance. The study highlights the reliability and efficiency of large-scale PV grid integration and identifies scope for further enhancement through intelligent MPPT algorithms, battery support, LVRT capability, and HIL validation.