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Abstract
Here multilevel inverter uses a series of semiconductor power converters thus generating higher voltage. The concept of multilevel inverters is used to decrease the harmonic distortion in the output waveform without decreasing the inverter output power. We can synthesize switched waveforms with lower levels of harmonic distortion than an equivalently rated two-level converter. Multilevel inverters can generate power with low distortion. This paper presents the most important topologies like diode-clamped inverter (neutral- point clamped),capacitor-clamped (flying capacitor), and cascaded multilevel with separate dc sources and it also presents the most relevant modulation methods developed for this family of converters: multilevel sinusoidal pulse width modulation, multilevel selective harmonic elimination, and space-vector modulation. It is believed that this article will be very much useful to the researchers for finding out the relevant references in the field of topologies and modulation strategies of multilevel inverter.