Review Study on Topologies of Multilevel Inverters

This paper reviews state of the art of multilevel inverter topologies. Power electronics devices are which converts DC power to AC power at required output voltage and frequency level is known as inverters. Multilevel inverter has three different major topologies have been applied in industrial applications: Cascaded H-bridges converter, Diode clamped, and Flying capacitor multilevel inverter. A multilevel inverter can be preferred for multipurpose applications, such as an active power filter, a static VAR compensator and a machine drive for sinusoidal and trapezoidal current applications. Some of the drawbacks to the multilevel inverters are the requirement of isolated power supplies for individual stages, the fact that they are a lot complex to design, they are more costly, and they are more difficult to control in software.