Cascaded Multilevel Inverter for PV-Active Power Filter Combination into the Grid-Tied Solar System

The presence of non-linear loads, such as electronic power converter, into the grid generally affects the electric power quality. This latter presents a fundamental factor in the performance of the grid consumers. Besides, nowadays, the photovoltaic (PV) energy integration spreads for residential and commercial applications. These PV systems impose the use of power inverters to liaise with the electric grid. In this context, this paper aims to benefit from a modelling PV inverter to fix the power disorder and then to guarantee better equipment performance. The proposed model configuration mainly involves a seventeen-level cascaded inverter controlled by the active and reactive instantaneous power theory. The regulation system consists of PI regulators for the dc-link voltage as well as the inverter output currents. This PV inverter provides successful harmonics mitigation while achieving its fundamental function. Also, it ensures reduction of overall source current THD values, efficient DC-link regulation, and quick response over the system variations. MATLAB/Simulink simulation results show the electrical behaviour of the whole model for different cases and operation modes.