Modeling and Simulation of Multilevel Inverters used in Hybrid Systems (PV/Wind) Connected to Smart Grid

Solar energy produces DC power which needs to be converted into AC power for further required applications. The conversion process is done using cascaded multilevel inverter with less THD%. In this paper the simulation and analysing of the different cascaded H-bridge multi-level inverter were done in MATLAB/SIMULINK software. The total harmonic distortion THD% in output voltage produced in 5-level, 7-level and 9-level inverters are obtained and compared. In fact, this inverter is installed and connected to a microgrid used to supply the block of Faculty of Mechanical and Electrical Engineering at Tishreen University. The suggested multi-level inverter (5,7,9 levels) consists of bidirectional switches with pulse-width modulation technique (PWM). This study is considered as a part of an integrated research of a solar-wind hybrid system that has been modelled and connected to the grid of the studied block. The output voltage of the proposed inverter has sinusoidal form with a total harmonic distortion THD of less than 2%.