Analysis and Small Signal Modeling of Five-Level Series Resonant Inverter

Alla Eddine Toubal Maamar,Saad Mekhilef,Rachid Taleb,Addy Wahyudie,Muhyaddin Rawa,Mostefa Kermadi,M'Hamed Helaimi

doi:10.1109/access.2021.3102102

Abstract

This paper explains the implementation of a small-signal model for a new five-level series resonant inverter structure. The proposed circuit combines the advantages of multilevel inverters and the characteristics of the physical phenomena, resonance. The small-signal model offers the possibility to design a linearized linear time-invariant (LTI) model around an equilibrium point based on the first-order Taylor series. After that, the performance of the proposed five-level series resonant inverter and its small-signal model are evaluated in MATLAB/Simulink environment. Compared with a MATLAB model generated using the system identification toolbox, the developed small-signal model exhibited a good accuracy in frequency and time domains. In addition, a hardware test bench is developed to validate the proposed model. Both simulation and experimental results show that the proposed multilevel resonant inverter is very interesting for high-voltage high-frequency applications. As a perspective, from the results obtained, we suggest the use of small-signal AC analysis for multilevel series resonant inverter modeling. The paper contains rich information on the recently used tools for dynamic systems modeling and analysis of nonlinear processes that can be applied to modeling and analyzing other power electronics inverters.

Highlights

In the power electronics domain, there are particular types of inverters known as resonant inverters
The three main structures for realizing a resonant inverter are shown in Fig. 1, namely: series resonant tank, parallel resonant tank, and series-parallel resonant tank [6]
Simulation of the five-level series resonant inverter is performed in MATLAB/SimPowerSystems environment

Summary

Introduction

In the power electronics domain, there are particular types of inverters known as resonant inverters. These types are used in many power applications, where the generated output voltage of resonant inverter topologies has a highfrequency value [1]. The resonant inverter has received much attention in power electronics research and introduced in a wide range of industry applications, including: power conversion systems [2], induction heating [3], telecommunication and wireless power transfer [4], and ozone generators [5]. Half-bridge and Full-bridge are the conventional-used topologies for realizing resonant converters [2]. The multilevel inverter is not famous for high-frequency resonant inverters because their

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Conclusion