Saeed javadniayrik - M.sc Power Electronic ,Islamic Azad University of Lahijan
Soroush Javaniayrik - Student Computer Software ,Pnu University of Talesh

Recently multilevel inverters (MLI) are gaining popularity due to reduced voltage stress across power switches and low total harmonic distortion (THD) output voltage waveform.So, we can pave a way for omission of higher degree harmonics which also named the change of making key angels by changing the way of making key in the main frequency, or we candecrease the effects of harmonics by providing a topology of multilevel inverters.Soby changing in the topology, we could not only use fewer elements, but also we could decrease the harmonics of waveform of outcome and we reached to a desired sinus. In the paper, the multilevel inverters are used for decreasing the harmonics because in essence theyintend to have fewer (dv/dt) due to much lower voltages.The introduced concept is analyzed by studies of simulation of 81-levels inverter and it is investigated by experiments and the results of simulation is investigated by MATLAB software

Multi-Level Inverter; Total Harmonic Distoration;Voltage Distortion(dv ، dt)