Comparison of harmonics and THD suppression with three and 5 level multilevel inverter-cascaded H-bridge

The major drawback of an inverter are Total Harmonic Distortion (THD) and Harmonics. The study of harmonics and THD are carried out in this work. The cascaded multilevel inverter topology is incorporated to suppress the harmonics produced by the inverter at its output. The cascaded multilevel inverter is most effective with fuel cells or battery stored power. The cells have low voltage ratings, the cascaded inverter input must be of low voltages to achieve 230v output. The simulation work is carried out with SIMULINK/MATLAB. The harmonics at output of inverter with 3 phase load is studied. 3 level and 5 level cascaded multilevel inverter's harmonics and THD are compared with traditional inverter drive. The study of multilevel inverter topology suppresses the harmonics and THD.