Real-time harmonic minimization of multilevel inverters used in photovoltaic systems

The paper proposes a novel methodology for calculating switching angles for a multilevel cascaded H-bridge converter connected to the solar panels. Here desired voltage is synthesized from separate solar panels connected to each series-connected bridges of the cascaded multilevel inverter. This is obtained by generating the suitable switching angles and their by achieving the required fundamental frequency and the lower harmonics can be minimized. Particle Swarm Optimization (PSO) algorithm is used to find the solution for the set of equations where the input voltages are the known variables and the switching angles are the unknown variables and the Artificial neural networks (ANN) is to determine the switching angles that correspond to the real-time values of the solar panel voltages. Switching pulse logic is designed for H-bridge. The effectiveness of the proposed system is validated by simulation using MATLAB/Simulink.