Designing Nth Level Inverter Using Asymmetric H-bridge MLI Topology: with Techniques to Minimize THD

The Asymmetrical H-Bridge (ASHB) Multilevel Inverter (MLI) is a sophisticated power electronics device that has received great attention for its potential to deliver high-power conversion with decreased harmonic distortion. In this paper, we present a comprehensive investigation of the Asymmetrical H-Bridge Multilevel Inverter, focusing on its operational principles, unique structure, and inherent advantages over conventional two-level inverters. We shall elucidate the architectural configuration of the Asymmetrical H-bridge multilevel Inverter. This configuration comprises a series of cascaded H-bridge modules, each endowed with the capacity to produce numerous discrete voltage levels. This in turn results leading to an improved voltage output resolution. We propose a generalized pattern 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 proposed approach includes two distinct techniques, and one of the pivotal components is the introduction of a proposed voltage ratio. As a direct outcome, we found a substantial reduction in the THD, attaining an exceptional value of 2.89% across a spectrum encompassing 39 discrete voltage levels. A comprehensive investigation of the THD is undertaken, emphasizing the Asymmetrical H-bridge multilevel Inverter’s capacity to attain low THD values, which considerably improves the output voltage waveform.