Design of Nth Level Inverter using Asymmetric H-Bridge MLI Topology:

Abstract

The Asymmetrical H-Bridge (ASHB) Multilevel Inverter (MLI) is an advanced power electronics device, gaining notable interest for its capacity to efficiently convert high power while minimizing harmonic distortion. This research paper extensively explores the Asymmetrical H-Bridge Multilevel Inverter, delving into its operational principles, distinctive structure, and inherent advantages compared to standard two-level inverters, providing valuable insights into its potential applications in power conversion systems. We begin by describing the Asymmetrical H-Bridge Multilevel Inverter's architecture, which consists of cascaded H-bridge modules capable of generating multiple voltage levels, leading to improved voltage output resolution. We propose an equation to construct the N-th level of the Asymmetrical H-Bridge Multilevel Inverter, enabling engineers to synthesize higher-level inverters tailored to specific application requirements. The equation takes into account the number of H-bridge modules necessary for the desired level and ensures precise voltage level generation. Additionally, we present a novel approach targeted at mitigating Total Harmonic Distortion (THD). Our method incorporates two distinct techniques, and one of the pivotal components is the introduction of a proposed voltage ratio. As a consequence of this innovation, we have achieved a significant reduction in THD, obtaining a remarkable value of 2.89% over a spectrum of 39 levels. A comprehensive investigation of the Total Harmonic Distortion (THD) is undertaken, emphasizing the Asymmetrical H-Bridge Multilevel Inverter's capacity to attain low THD values, which considerably increases the quality of the output voltage waveform.