Control of three phase cascaded multilevel inverter using various novel multicarrier pulse width modulation techniques

In this paper, various novel pulse width modulation techniques are analysed, which can enhances the output voltages from five level inverter to multilevel topologies. Multilevel inverters are important for power electronics applications such as flexible ac transmission systems, renewable energy sources, uninterruptible power supplies and active power filters. Three methodologies adopting the constant switching frequency, variable switching frequency multicarrier, phase shifted carrier pulse width modulation concepts are proposed in this paper. The above pulse width modulation techniques analyses by switching frequency optimal methodology. This methodology strategy enhances the output voltages for three phase cascaded multilevel inverter. Field programmable gate array has been chosen to implement the pulse width modulation due its fast proto typing, simple hardware and software design. Simulation and Experimental results are provided.