Non Linear Control Approach of PV-Fed Grid-Tied Dual Boost Inverter

This works presents a novel approach to the design of a photovoltaic (PV) grid-connected system using a differential boost inverter. The proposed system aims to improve the overall efficiency of the power conversion process. The aim is to achieve three objectives simultaneously: i) power factor correction, ii) regulation of the currents (i_1, i_2) flowing through the inductances (L_1, L_2) iii) operating the PV generator at its optimum power point MPPT. A linear regulator based on PI regulator consisting of three cascaded loops is used to achieve these objectives. The first loop ensures the injection of an alternating current i_g in phase with the grid voltage v_g, while the second loop regulates the currents i_1 and i_2. The last one is dedicated to regulating the PV voltage. Simulation results of the entire system in Matlab/Simulink show that the proposed system offers a higher efficiency and better power quality.