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This paper proposes a novel topology for grid connected photovoltaic (PV)system based on modular multilevel converter (MMC). In this topology, a PVarray is connected to capacitors of each submodule (SM) of the MMC through aDC-DC boost converter with maximum power point tracking (MPPT) control. Thistopology will maximize the efficiency of the system in the case of partialshading conditions, as it can regulate the SM capacitor voltages independentlyfrom each other to realize distributed MPPT. A model predictive control is usedto track the AC output current, balance the SMs capacitor voltages, and tomitigate the circulating current. The proposed PV generation topology with 7level MMC system validity has been verified by simulations via MATLAB/Simulinktoolbox under normal operation, partial shading and PV array failure.

MMC-Based Distributed Maximum Power Point Tracking for Photovoltaic Systems