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MPPT algorithm for grid-connected photovoltaic generation systems via model predictive controller

This paper presents a grid-tied photovoltaic generation system (PVGS) combined with a maximum powerpoint tracking (MPPT) technique. Perturbation and observation (P&O) MPPT algorithm is applied to a solar array for MPPT and to reduce the steady state oscillations. Proportional-integral (PI) controller combined with the phase-locked loop (PLL) are usually used to tie three-phase systems to the grid utility. Model predictive control (MPC), as a fast operating controller, is used to tie the solar system to the grid for real and reactive powers decoupling. A MATLAB/SIMULINK software is applied to establish the PV system, the MPPT controller, and the model predictive controller. The PVGS is simulated under an imitated one day of irradiance change. Results reveal that the MPPT controller efficiently tracks the MPP and the MPC connects the PVGS to the grid efficiently.