Cascaded Multilevel Inverters for Reduce Harmonic Distortions in Solar PV Applications

The paper presents, a reverse system for sustainable energy function developed using the Cascaded H-bridge Multilevel Inverter (CHMI) that is able to produce a desired voltage by changing levels of DC voltages. A CHMI using Photovoltaic (PV) as source cells model was developed by means of the MATLAB Simulink. It was used to explore and validate the quality of the AC output voltage, harmonic traces of the output voltage and effects of varying switching schemes. The paper examine Sinusoidal Pulse Width Modulation (SPWM) technique applied to the CHMI in order to make sure a proficient voltage utilization and good harmonic band. The system simulation results using simulink program are shown and discussed together with a distinguish study for the various control techniques of the CHMI. A FPGA based controller is utilized to produce the PWM pulses for triggering the switches. By using this control method THD value less than 5% in hardware set up was obtained.