Switched-Capacitor Multilevel Inverters: A Comprehensive Review

Barzegarkhoo, Reza; Forouzesh, Mojtaba; Lee, Sze Sing; Blaabjerg, Frede; Siwakoti, Yam P.

doi:10.1109/tpel.2022.3164508

Cited by 101 publications

(37 citation statements)

References 203 publications

(456 reference statements)

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“…Multi-level inverters (MLIs) are being substituted for traditional inverters because of their many well-known advantages such as high-quality harmonic profiles, low voltage across switches, low electromagnetic interference (EMI), and high efficiency 3 . Advances in power electronics have influenced the evolution of MLI topologies 4 .…”

Section: Introductionmentioning

confidence: 99%

Design of a 21-level multilevel inverter with minimum number of devices count

Hataş

Karakılıç

Almalı

2023

Preprint

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Multilevel inverters (MLIs) have attracted the attention of researchers for their needs in industrial applications, renewable energy systems, and electric vehicles. MLIs require a large number of power electronic components to synthesize higher levels at the output voltage. However, overuse of power electronic devices increases the complexity, losses, and cost of MLIs. In this study, a new MLI has been proposed with a reduced number of power switches. The basic unit of the proposed MLI comprises only three independent DC sources and ten switches (eight unidirectional, and two bidirectional) to produce 21 levels at the output voltage waveform. The nearest level control (NLC) modulation method has been used to produce gate pulses. Furthermore, three extension topologies have been proposed to generate a higher number of levels and the extension parameters have been compared with recently introduced and conventional topologies. The comparative study shows that the proposed MLI topology requires fewer components in terms of power electronics parameters than the others. On the other hand, the presented first extension study can be used for all non-extendable basic units is one of the prominent values of the study. Simulation studies showing modulation methods, switching patterns, and signal outputs were performed with Matlab/Simulink. A prototype of the proposed main module has been realized and tested in the laboratory with an FPGA processing board. Experimental results have been verified with simulation results, and the performance of the proposed topology has been proven.

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Section: Introductionmentioning

confidence: 99%

Design of a 21-level multilevel inverter with minimum number of devices count

Hataş

Karakılıç

Almalı

2023

Preprint

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“…With the different sources (V dc2 -V dc1 ) used in [18], the levelgenerating unit cannot synthesise the voltage level. A coupled inductor based on a non-isolated multi-input interleaved converter has been described in [19]. In terms of the SC method, the authors in [20] depict a novel MLI topology with a full bridge.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Implementation of Switched Capacitor-based Multi-Level Inverter for Electric Vehicles Applications

Manivel

Kaliappan²

2023

ELEKTRON ELEKTROTECH

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Significant interest has been shown in switched capacitor (SC)-based multi-level inverters (MLIs), which decrease the need for a DC supply and enhance power quality. The common issues with SC-MLIs include an uneven distribution of conducting paths, increased voltage drop across capacitors, the sum of all inverter DC link voltages across the highest voltage rated switches, and a higher total standing voltage (TSV). The purpose of this paper is to create a SC-MLI with less components in order to maintain a constant voltage across the capacitors, to obtain higher voltage gain with fewer parts, fewer conducting routes, lower TSV, and to create a more affordable and effective inverter. The structure of the MLI is created by a cascade interconnection between the number of SC cells. A single input multiple output (SIMO) converter boosts the DC-link voltage over the stable DC voltage of the solar panels using a modified perturb and observe (P&O) method. Additionally, fewer switches in the conduction path and 50 % of the switches operating at normal frequency guarantee a decrease in an overall loss of power in the proposed network. The benefits of the recommended MLI are made clear by comparing them with 17-level MLIs in terms of the number of elements, stress, gain, and cost factor. Detailed experimental results are shown under various transient conditions to show that the 17-level prototype is operationally viable. The total harmonic distortion (THD) is found to be identical and is less than 5 %, which meets IEEE standards.

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“…Among all the categories of MLI switched capacitor-based boost-type topologies are more popular [13]. In switched capacitor-based topologies containing several switches or diodes, capacitors are connected in either series/parallel technique for generating output voltage levels [14]. Several advantages of the switched capacitor (SC) based MLI are most suitable for renewable energy, and solar PV rooftop applications.…”

Section: Introductionmentioning

confidence: 99%

Quadruple Boost Switched Capacitor-Based Inverter for Standalone Applications

Kovvali

Nakka

Kishore³

et al. 2023

IEEE Access

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Conventional energy sources will not be sufficient to meet future electrical demands, and also pollute the environment. Therefore, to meet their electrical energy needs, and maintain clean and green environmental conditions, people are focusing more on renewable energy sources. Small-scale PV solar standalone AC loads or grid integration applications need high voltage at a desired level, transformer/inductor less operation, high gain DC-DC front-end converters, and DC-AC converters. To achieve all the above objectives, this paper proposes a step-up quadruple boost nine-level inverter, it works on switched capacitor technique with a reduced count of components for the application of renewable energy systems. The proposed topology balances the capacitor voltages with the control scheme itself without using any sensors. A levelshifted pulse-width modulation (LPWM) technique can be used in the control strategy of the proposed topology. This paper covers the operational modes of the proposed topology, voltage stress calculations, capacitors calculations, and losses calculations at various stages and compared with recent literature, that reveals this topology is more advantageous in terms of less total standing voltage, switch count, cost factor, better efficiency and the number of gate driver circuits. The theoretical performance can be validated through MATLAB/Simulink-based simulation and their results are validated through prototype experimentation. Further, the experimental results contain modulation index variations, frequency modulation, switching frequency variations, input voltage variations, and load variations. Finally, the max efficiency of 96.5% is achieved for the experimental prototype of the proposed topology.INDEX TERMS Switched Capacitor (SC) based Inverter, High Gain inverter topologies, solar PV, self-voltage balance and Level Shifted Pulse Width Modulation (LSPWM).

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Switched-Capacitor Multilevel Inverters: A Comprehensive Review

Cited by 101 publications

References 203 publications

Design of a 21-level multilevel inverter with minimum number of devices count

Design of a 21-level multilevel inverter with minimum number of devices count

Analysis and Implementation of Switched Capacitor-based Multi-Level Inverter for Electric Vehicles Applications

Quadruple Boost Switched Capacitor-Based Inverter for Standalone Applications

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