Implementation of THD and output voltage of three phase cascaded multilevel inverter using multicarrier pulse width modulation techniques

In this paper, various multicarrier pulse width modulation techniques are proposed, which can minimize the total harmonic distortion and enhances the output voltages from five level inverter. 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 multicarrier pulse width modulation cascaded multilevel inverter strategy, minimized total harmonic distortion and enhances the output voltages. FPGA has been chosen to implement the pulse width modulation due its fast proto typing, simple hardware and software design. The simulation and experimental results are presented.