A Grid-connected PV System Based on Modular Multilevel Converter With Model Predictive Control Strategy

Today, PV systems have been widely used in power networks. The important issues about them are efficiency and power quality. In this way, inverters have the important role to achieve high efficiency, control power injected into the grid and improve power quality. The selection of inverter topology and the control strategy are two necessary factors to achieve the specified performance objectives. In this way, multilevel inverters with modularity and low cost can be a good choice for the next generation of efficient and reliable solar power stations. This paper introduces the improved topology of the photovoltaic supported MMC for grid interface. To observe all the control requirements simultaneously, only with one controller, FCS-MPC is used. It satisfies the control objectives like constant power in grid voltage sag/swell, synchronizing grid utility voltage with output current and low total harmonic distortion. The validity of the proposed system and the comparison with conventional topology is confirmed by MATLAB/SIMULATION.