Modeling and Simulation of Total Harmonic Distortion (THD) in Multilevel H Bridge Inverters for Healthcare

Abstract

Due to COVID-19 overhead on ICU, CCU is more demanding the high voltage backup solar PV inverters in healthcare. To fulfill high voltage requirement of the medical equipment in healthcare applications, many multilevel inverter designs have been proposed in recent times. Cascaded H Bridge (CHB) inverter is light weight and requires fewer components to design. The major concern in the inverter design is to compensate for the THD performance. It is obvious to have THD due to uses of large switches. Therefore, this paper has reviewed the FFT performance of various single and three phase inverting architectures using CHB. The paper first describes the basic single H bridge used for Solar PV inverter design. In this prime, focus is to design the GTO-based high voltage inverters. There are five level, seven level, nine level, and eleven level inverters considered for the evaluation of performance during the survey. The THD is considered for the evaluation parameter in the survey. The FFT analysis is considered for the performance comparison of the multilevels inverters. Various applications of the H bridge inverters are also considered for the paper to discuss. It is concluded that increasing the levels may reduce the harmonic distortions and may increase voltage performance of medical equipments.