Obtaining a pure sinusoidal waveform using multilevel inverters with increased higher voltage levels using NPC H-bridge

Abstract

This paper presents a Multilevel inverter that consists of a standard 3-leg two level inverter cascaded with two new neutral point clamped H-bridge inverter in series with each inverter leg with a single dc voltage source of 300V. The control signals for this multilevel inverter is obtained by using carrier based PWM technique. The proposed multilevel inverter is used to obtain a pure sinusoidal waveform which is verified using MATLAB/SIMULINK software. The results of the simulation, the output waveform of three phase voltage and phase current obtained are pure sinusoidal therefore the proposed topology can be implemented for HVDC transmission and induction motor drives using the dc source obtained from solar panels which is converted to ac using proposed topology. The proposed topology is concentrated to increase the voltage levels of the output using a single dc source. The new NPC flying capacitor H-Bridge inverter is invented in this paper and its advantages are discussed in this paper by doing so a pure sine wave is obtained.