Special Issue Article Open Access

A New Multilevel Inverter Topology for DC-AC Conversion

Abstract

Multilevel inverters have been widely used for high power, high voltage applications. Among the existing multilevel inverter topologies Cascaded inverter topology has many advantages over Neutral point clamped and Flying capacitor inverters, but it requires isolated DC sources which is a main drawback of this topology. This work reports a new topology with a reversing-voltage component and is proposed to improve the multilevel performance by compensating the disadvantages mentioned and the total harmonic distortion is analyzed. The new topology produces a significant reduction in the number of power devices and capacitors required to implement a multilevel output. This topology requires fewer components compared to existing inverters (particularly in higher levels) and requires fewer carrier signals and gate drives. A nine level PWM inverter configuration with DC sources are verified through MATLAB/SIMULINK software. Furthermore, an experimental prototype of a nine level inverter for both cascade and RV inverter has been implemented ant total harmonic distortion (THD) is calculated using MATLAB/SIMULINK software. Result have been compared and validated for the same.

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