Optimized Harmonics Stepped Wav Modulation(OHSW-PWM) for high vol cascaded multilevel inverter with equal commonly used in constant frequency u Stepped switching angles for cascaded mul calculated by solving nonlinear equations selected lower order harmonics. This generalized method to calculate the switchi Newton-Raphson method for solving the n which are transcendental in nature and mult Calculations of the switching angels a anticipated formula for calculating the initial paper presents solutions for 5, 7, 9, 11, inverters under different values of the mod Matlab software. The results reveal that method can be effectively used to calculate t that eliminate the selective lower order harm output voltage and reduce the total harmo experimental and simulated results proved the proposed method. Index Terms--Cascaded Multilevel In Harmonic Stepped Waveform, Selective Har PWM. Newton-Raphson method.I.

To link DC power sources to an AC grid, converters are needed. Inverters are the power electronic devices, which are used for this purpose. Conventional inverters employ harmonic filters and transformers that are lossy and expensive. Multilevel inverters (MLIs) are an alternative to conventional ones, proposing reduced total harmonic distortion (THD), increased range of control, and inductor-less design. They generate a stepped waveform, with close similarity to a sine wave. Many distributed sources may be employed in a smart grid. If those sources have minimal THD, the filtering process could be reduced at the point of common coupling. This paper presents two switched capacitor based MLIs, proposing boost capability and low THD. Inverters have inherent charge balancing capability, which eliminates the need for auxiliary circuits and voltage sensors. Inverters switches are modulated using phase opposition disposition pulse-width modulation (PODPWM) method that ease the balancing of the voltage and decrease the losses of switching. Designs were verified by simulation and the output waveforms were introduced.