Performance Evaluation and Comparative Study of Single and Two Stages Inverters Used in Grid-Connected Photovoltaic Systems

This comparative study between two topologies of three-phase grid-connected photovoltaic inverters, namely the single-stage inverter and the two-stage inverter, was modeled and simulated using Matlab Simulink. The control of the two-level inverter is by the synchronous reference frame method, and the tracker of the PV array power is by the incremental conductance MPPT algorithm. In this paper, performance analysis of PV grid-connected inverters based on the overall efficiency and harmonic distortion. The simulation results indicate satisfaction with the quality of the current and voltage inj ected into the electrical grid, where THD is according to the recommendations of the IEEE-519 standard, and both topologies are efficient, but the single-stage inverter performs better than the two-stage inverter.