A single-phase grid-connected photovoltaic power system using DFCM converter

This paper presents a single-phase grid-connected photovoltaic power system with the capability of maximum power point tracking (MPPT) of photovoltaic (PV) array and reactive power compensation. This topology employs a boost converter to track the maximum power point of PV array and a dual flying capacitor multicell (DFCM) converter in order to connect to the grid. The proposed system can fulfill comprehensive reactive power performance even when the PV power is unavailable. The four-cell nine-level DFCM converter, controlled with modified PSPWM, has improved output voltage frequency spectrum, and low harmonic distortion with reduced number of switches among nine-level inverters. The simulation results, developed in MATLAB software, verify the performance and advantages of the proposed system.