Triphase Symmetrical Cascaded Multilevel Inverter (5L) for PV Systems Controlled by Various Multicarrier PWM Strategies

This paper presents a comparative study in the Matlab/Simulink environment among six multicarrier pulse width modulation strategies (MCPWM), of triphase symmetrical cascaded H-bridge multilevel inverter (five level). We will consider the Phase Disposition PWM, the Phase Opposition Disposition PWM, the Alternate Phase Opposition Disposition PWM, the Carrier Overlapping PWM, the Variable frequency PWM and the Phase Shifted Carrier PWM. Each type of these MCSPWM controls the same inverter. The symmetric voltage sources, supplying inverters cells are simulated using a DC voltage representing photovoltaic arrays (PV). Comparison of these MCPWMs is based on the spectral quality and magnitude of the output compound and simple voltages. The different strategies are carried out in Matlab/Simulink software environment with simulation results