Multilevel Inverter: A study

Electrical Engineering

Multilevel inverters are in favour of academia as well as industry in the recent decade for high-power and medium-voltage applications. In addition, they can synthesize switched waveforms with lower levels of harmonic distortion compared to a two-level converter. Multilevel converters have received increased interest recently as a result of their ability to generate high quality output waveforms with a low switching frequency; the multilevel concept is used to decrease the harmonic distortion in the output waveform without decreasing the inverter power output. This paper presents a review on most important topologies, control techniques of multilevel inverters and also the applications powered by multilevel inverters which are becoming an enabling technology in many industrial and research areas. Numerous industrial applications have begun to require higher power apparatus in recent years. Some medium voltage motor drives and utility applications require medium voltage and megawatt power level. For a medium voltage grid, it is troublesome to connect only one power semiconductor switch directly. As a result, a multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations. A multilevel converter not only achieves high power ratings, but also enables the use of renewable energy sources. Renewable energy sources such as photovoltaic, wind, and fuel cells can be easily interfaced to a multilevel converter system for a high power application

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