Improved modified a multi-level inverter with a minimum total harmonic distortion

Renewable energy sources are developed as a result of the increased demand for electrical power. The nature solar source is DC. DC many applications needs to be converted AC. inverter used convert power from Total harmonic distortion (THD) significant concern with inverters. Multi-level inverters reduce THD. stair output voltage multi-level not only reduces THD but also switches' stresses, so low rating can switches. In this paper, modified topology introduced in which number switches reduced same levels, leads reducing losses and cost. To THD, different amplitudes carrier signals that control each level suggested. Another method by using capacitor values across input presented. MATLAB/Simulink show validity suggested modifications.