Simplified sinusoidal pulse width modulation for cascaded half-bridge multilevel inverter

This paper presents a simplified sinusoidal pulse width modulation (SSPWM) proposed to control a half-bridge multilevel inverter. This topology has less number of switching components compared to conventional types of multilevel inverter. It can be supplied from separated dc sources or renewable energy sources like solar energy via photovoltaic modules. This topology can be a symmetric or an asymmetric inverter via controlling the magnitude of dc sources. The asymmetric choice provides higher number of levels with less number of switches and dc sources. The proposed technique is a high switching frequency modulation based on the sinusoidal pulse width modulation. The SSPWM can be achieved using only one modulating, carrier signals and throughout a certain logic arrangement depends on number of levels. A laboratory system was built based upon the (NI PCI-6013) data acquisition controller and experimental results for single phase fifteen-level inverter show a well-matching and good similarity with the simulation results.