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High-Power Density Multilevel Inverter/Converter System
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High-Power Density Multilevel Inverter/Converter System

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Power Electronics".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 6524

Special Issue Editors

Dr. June-Seok Lee

E-Mail Website
Guest Editor
School of Electronics and Electrical Engineering, Dankook University, Yongin 16890, Gyeonggi-do, Republic of Korea
Interests: multilevel inverter; power generation systems; electrics traction systems
Special Issues, Collections and Topics in MDPI journals
Prof. Jae-Bum Lee

E-Mail Website
Guest Editor
Department of Railroad Electrical and Electronic Engineering, Korea National University of Transportation, Uiwang 16106, Korea
Interests: AC/DC converter; DC/DC converter; high power density/high efficiency converter; modular converter; electric vehicle/traction system
Prof. Dr. Yeongsu Bak

E-Mail Website
Guest Editor
Department of Electrical Energy Engineering, Keimyung University, Daegu 42601, Republic of Korea
Interests: electric machine drives; matrix converter; grid-connected systems; renewable power generation systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Multilevel inverters/converters have become an increasingly attractive topology for industrial high-voltage applications. They have enabled important development in order to reach a high power at increasing voltage levels. They have been used in many applications such as traditional high-power motor drive systems, substations in grids, and railway systems. Recently, their application has even extended to low-voltage applications, because they enable achieving a high efficiency by reducing the loss caused by the high current.

Depending on the application requirements, such as high-input-voltage/low-output-voltage and AC-to-AC voltage conversion, multilevel inverters/converters are combined with other converters. The total system has become complex more than before. Moreover, we are facing new challenges, such as the miniaturization, lightening of weight, high efficiency, and high reliability in the complex system. This Special Issue focuses on the analysis, design, and implementation of high-power density multilevel inverter/converter systems for its miniaturization, lightening of weight, high efficiency, and high reliability.

The topics of interest include, but are not limited to, the following:

  • Multi-level or multi-modular inverter/converter
  • Solid-state transformer
  • Parallel-series structure inverter/converter
  • Zero-voltage-switching (ZVS)/zero-current-switching (ZCS) converter
  • High-power-density converter
  • Modulation (or switching) methods
  • Voltage/current balancing control
  • Fault detection and tolerant control
  • Reliability evaluation and improvement method

Prof. June-Seok Lee
Prof. Jae-Bum Lee
Prof. Yeongsu Bak
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

18 pages, 5012 KiB  
Article
Voltage Multiplier with High Input/Output Voltage Gain from Center-Tap Rectifier-Voltage Tripler and Quadrupler
by Sang-Gyun Ryu, Chan-Bae Park, Hyung-Woo Lee and Jae-Bum Lee
Electronics 2022, 11(8), 1188; https://doi.org/10.3390/electronics11081188 - 8 Apr 2022
Viewed by 1808
Abstract
This paper proposes new rectifiers in the center-tap transformer to provide higher input/output (I/O) voltage gain with an equal transformer turns-ratio in the LLC resonant converter: a voltage tripler rectifier and a voltage quadrupler rectifier, which have simple structures with one capacitor and [...] Read more.
This paper proposes new rectifiers in the center-tap transformer to provide higher input/output (I/O) voltage gain with an equal transformer turns-ratio in the LLC resonant converter: a voltage tripler rectifier and a voltage quadrupler rectifier, which have simple structures with one capacitor and two diodes, and three and four times higher I/O voltage gain than a center-tap rectifier, respectively. Each rectifier is compared in terms of the transformer turns-ratio and the magnetizing offset current, and the voltage and current stresses in the capacitors and diodes. The validity of these proposed rectifiers in the half-bridge (HB) LLC resonant converter is confirmed by the experimental results from a 100 V/200 W output prototype. Full article
(This article belongs to the Special Issue High-Power Density Multilevel Inverter/Converter System)
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25 pages, 11163 KiB  
Article
Optimal Hybrid PV Array Topologies to Maximize the Power Output by Reducing the Effect of Non-Uniform Operating Conditions
by Suneel Raju Pendem, Suresh Mikkili, Shriram S. Rangarajan, Sudhakar Avv, Randolph E. Collins and Tomonobu Senjyu
Electronics 2021, 10(23), 3014; https://doi.org/10.3390/electronics10233014 - 2 Dec 2021
Cited by 31 | Viewed by 2064
Abstract
The photovoltaic (PV) system center inverter architecture comprises various conventional array topologies such as simple-series (S-S), parallel (P), series-parallel (S-P), total-cross-tied (T-C-T), bridge-linked (B-L), and honey-comb (H-C). The conventional PV array topologies under non-uniform operating conditions (NUOCs) produce a higher amount of mismatching [...] Read more.
The photovoltaic (PV) system center inverter architecture comprises various conventional array topologies such as simple-series (S-S), parallel (P), series-parallel (S-P), total-cross-tied (T-C-T), bridge-linked (B-L), and honey-comb (H-C). The conventional PV array topologies under non-uniform operating conditions (NUOCs) produce a higher amount of mismatching power loss and represent multiple maximum-power-points (M-P-Ps) in the output characteristics. The performance of T-C-T topology is found superior among the conventional topologies under NUOCs. However, T-C-T topology’s main limitations are higher redundancy, more number of electrical connections, higher cabling loss, poor performance during row-wise shading patterns, and more number of switches and sensors for the re-configuration of PV modules. This paper proposes the various optimal hybrid PV array topologies to overcome the limitations of conventional T-C-T array topology. The proposed hybrid topologies are such as series-parallel-cross-tied (S-P-C-T), bridge-link-cross-tied (B-L-C-T), honey-comb-cross-tied (H-C-C-T), series-parallel-total-cross-tied (S-P-T-C-T), bridge-link-total-cross-tied (B-L-T-C-T), honey-comb-total-cross-tied (H-C-T-C-T), and bridge-link-honey-comb (B-L-H-C). The proposed hybrid topologies performance is evaluated and compared with the conventional topologies under various NUOCs. The parameters used for the comparative study are open-circuit voltage, short-circuit current, global-maximum-power-point (GMPP), local-maximum-power-point (LMPP), number of LMPPs, and fill factor (FF). Furthermore, the mismatched power loss and the conversion efficiency of conventional and hybrid array topologies are also determined. Based on the results, it is found that the hybrid array topologies maximize the power output by mitigating the effect of NUOCs and reducing the number of LMPPs. Full article
(This article belongs to the Special Issue High-Power Density Multilevel Inverter/Converter System)
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18 pages, 7320 KiB  
Article
Control Methods for Performance Improvement of an Integrated On-Board Battery Charger in Hybrid Electric Vehicles
by Yeongsu Bak and Ho-Sung Kang
Electronics 2021, 10(20), 2506; https://doi.org/10.3390/electronics10202506 - 14 Oct 2021
Cited by 5 | Viewed by 1891
Abstract
This paper presents control methods for performance improvement of an integrated on-board battery charger (OBC) in hybrid electric vehicles (HEVs). HEVs generally consist of an OBC and a starter generator system (SGS). Since these each have a power conversion device for independent operation, [...] Read more.
This paper presents control methods for performance improvement of an integrated on-board battery charger (OBC) in hybrid electric vehicles (HEVs). HEVs generally consist of an OBC and a starter generator system (SGS). Since these each have a power conversion device for independent operation, such as battery charging and starter generator driving for engine starting, it necessarily increases the number of components, weight, and volume of the HEV. In order to overcome these disadvantages, recent research concerning the integrated OBC has progressed. Although it demands installation of power relays and an additional circuit, the integrated OBC is effectively operated for battery charging and starter generator driving. This paper proposes not only a harmonic reduction method of grid current, but also a feed-forward control method for performance improvement of the integrated OBC in HEVs. The effectiveness of the proposed control methods is verified by simulation and experimental results. Full article
(This article belongs to the Special Issue High-Power Density Multilevel Inverter/Converter System)
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