Modular Multilevel Converters for Large-Scale Grid-Connected Photovoltaic Systems: A Review

The use of photovoltaic (PV) systems as the energy source electrical distributed generators (DG) is gaining popularity, due to progress power electronics devices and technologies. Large-scale solar PV plants are becoming preferable solution meet fast growth demand, they can be installed in less than one year, compared around four years case conventional plants. Modular multilevel inverters (MMIs) best connect these large-scale medium-voltage (MV) grid, their numerous merits, such providing better quality, having higher efficiency, reliability, scalability. However, MMIs still progressing need some improvement before implemented safely industrial, medium, high voltage networks. main purpose this paper review present topologies when used applications. aims a comprehensive study various recent submodule circuits associated with MMI topologies. Maximum point tracking (MPPT) control schemes for will explored extensively. Then, different strategies presented give holistic overview submodules balancing techniques, ranges, capabilities under balanced unbalanced grid conditions. In addition, discuss future electricity