From the above all discussion we can conclude that in cascaded multilevel inverter topology with proper switching angle and conduction period derived from the calculation based on fourier analysis we can eliminate considerable amount of harmonics and we can reduce THD and by adding harmonic filter of proper frequency THD can be reduced at further more amount at least in software based s simulation.
So, finally by using proper switching angles and by adding filter we have reached at the THD level of 5.30017% which indicates that the wave forms are nearer to the fundamental sinusoidal waveforms.