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Symmetry
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Symmetry/Asymmetry in Power Electronics
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Symmetry/Asymmetry in Power Electronics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 2680

Special Issue Editors

Dr. Nikolay N. Lopatkin

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Guest Editor
Mathematics, Physics, Informatics department, Shukshin Altai State University for Humanities and Pedagogy, 659333 Biysk, Russia
Interests: multilevel converters and control of them; quality indexes of electrical energy processes and improvement of them
Prof. Dr. Aleksey V. Udovichenko

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Guest Editor
Department of Electronics and Electrical Engineering, Novosibirsk State Technical University, 630073 Novosibirsk, Russia
Interests: reactive power compensators; electromagnetic compatibility; direct methods of calculation; energy storage systems; Electric Car; induction motors; AC voltage regulator

Special Issue Information

Dear Colleagues,

The power electronics is one of the most important and fast developing branches of electrical and electronics engineering. This is due to the necessity of converting, stabilizing, and controlling electrical energy parameters while energy is produced by numerous modern sources, from conventional industrial power stations to distributed and renewable generation units, combined with smart networks and systems. The beauty and power of geometric patterns in power electronics are fully revealed when solving optimization problems by approaching symmetry. Despite the abovementioned diversity, from the point of view of generating output voltage of both alternating and direct currents, there is a commitment to the ideas of symmetry, balance, uniform current loading (and/or voltage applying distribution) of elements and units. It is these principles that allow optimizing the efficiency of the system, the quality of output energy and of energy consumed by the converter, as well as cost indicators. Another situation occurs in circuitry engineering, where symmetric and asymmetric solutions often dialectically replace each other in their evolution, generating related changes in control algorithms. Based on the abovementioned positions, the Guest Editors call for papers devoted to power quality and its indicators, conductive types of electromagnetic compatibility, balanced three-phase and any poly-phase power generation, multilevel circuitry and control of inverters and converters, distributed generation's architecture and control, interleaved circuits’ forming and control, bidirectional active power flow, and improved algorithms for power electronics’ systems control. Ideas around employing symmetry/asymmetry should be properly highlighted.

Dr. Nikolay N. Lopatkin
Prof. Dr. Aleksey V. Udovichenko
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. Symmetry is an international peer-reviewed open access monthly 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.

Keywords

  • power quality
  • harmonics
  • balance/unbalance indicators
  • active voltage unbalance compensators
  • compensators of non-active power
  • multilevel inverters/converters
  • coordinates’ transformations
  • advanced space vector pwm techniques
  • renewable power generation
  • interleaved circuits
  • bidirectional active power flow
  • power losses in power converters

Published Papers (3 papers)

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Research

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32 pages, 14679 KiB  
Article
Analysis of Novel Energy-Efficient Converters to Ensure the Required Quality of Electrical Energy
by Aleksey Udovichenko, Evgeniy Grishanov, Evgeniy Kosykh and Ali Mekhtiyev
Symmetry 2023, 15(11), 2092; https://doi.org/10.3390/sym15112092 - 20 Nov 2023
Cited by 1 | Viewed by 845
Abstract
This article proposes several solutions for the use of novel AC voltage regulators as electrical energy quality conditioners and for the use of a half-bridge voltage inverter circuit as an active filter. This study was carried out with a real object, and more [...] Read more.
This article proposes several solutions for the use of novel AC voltage regulators as electrical energy quality conditioners and for the use of a half-bridge voltage inverter circuit as an active filter. This study was carried out with a real object, and more attention was paid to it. Structural models of electrical energy quality assurance systems, the calculation of control system elements and experimental results are presented. In particular, the use of a half-bridge voltage inverter circuit was considered as a replacement for the passive filter of the battery charger and rectifier device. AC voltage regulators are also used as compensators for higher-current harmonics, namely active filters and reactive power, voltage drop, voltage unbalance and flicker effect compensators. Block diagrams of power quality conditioners are presented, control algorithms are developed and the results of the current high-frequency harmonics compensation, reactive power and signal balancing are presented. The results of an active filter experiment based on the NRT 160.220 charge-rectifier device circuit showed a reduction in ripple of up to 1% with smaller dimensions compared to a passive filter. The control characteristics and external characteristics of the regulators are removed. The dependences of the current THD factor and the power factor are presented depending on the modulation depth for AC voltage regulator circuits used as power quality conditioners. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Power Electronics)
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35 pages, 5686 KiB  
Article
An Innovative Design Approach for Resonant DC/AC Converters, Based on Symmetry in Their Operating Modes
by Nikolay Hinov
Symmetry 2023, 15(10), 1864; https://doi.org/10.3390/sym15101864 - 04 Oct 2023
Cited by 2 | Viewed by 696
Abstract
The manuscript presents an innovative approach for the engineering design of resonant DC/AC converters used as sources of high-frequency electricity for a variety of needs: industrial and domestic applications, wireless power transmission, high-performance lighting, and more. The methodology is based on the generalized [...] Read more.
The manuscript presents an innovative approach for the engineering design of resonant DC/AC converters used as sources of high-frequency electricity for a variety of needs: industrial and domestic applications, wireless power transmission, high-performance lighting, and more. The methodology is based on the generalized consideration of electromagnetic processes in a series resonant RLC circuit fed by a square-wave voltage source. Due to the symmetry in the form of the current in the AC circuit of the DC/AC converter, it is possible to generalize all their possible operating modes. This was realized by applying the quasi-boundary method to the analysis of resonant DC/AC converters with and without reverse diodes operating in soft and hard switching modes. On this basis, the transfer functions of the devices, which give the relationship between their output and input voltages, are defined and analytically determined. Additionally considered are cases of resonant DC/AC converters with complex output circuits, which are applied to match the load needs and the capabilities of the power electronic device. In this sense, the basic dependencies for designing the main types of resonant DC/AC converters using series and parallel load compensation are given. The effectiveness of the proposed methods is demonstrated through several examples, and their verification and validation is achieved with simulations and prototypes. The proposed innovative design approach is applicable not only in power electronics education, but also in the design and prototyping of a whole class of power electronic devices. The unification of design methodologies formalizes and algorithmizes the design process, which is an important step for its automation and for applying various optimization procedures to achieve certain goals. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Power Electronics)
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Review

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20 pages, 2464 KiB  
Review
A Review of Symmetry-Based Open-Circuit Fault Diagnostic Methods for Power Converters
by Yang Zhou, Jin Zhao and Zhixi Wu
Symmetry 2024, 16(2), 204; https://doi.org/10.3390/sym16020204 - 08 Feb 2024
Cited by 1 | Viewed by 642
Abstract
Power converters can convert the electrical energy output by power source into specific forms required by target device. They are widely used in various fields such as electrification, transportation, and power systems, and are the core components of the systems. Power converters are [...] Read more.
Power converters can convert the electrical energy output by power source into specific forms required by target device. They are widely used in various fields such as electrification, transportation, and power systems, and are the core components of the systems. Power converters are composed of power semiconductor devices (such as IGBTs), which are prone to failure due to abnormal conditions and aging degradation, leading to power converter faults. Therefore, over the past twenty years, extensive fault diagnosis methods for power converters have been studied and proposed. Among them, symmetry-based methods have the characteristics of rapid diagnosis speed and strong robustness, but so far there’s no systemic summary of such methods. Therefore, this paper reviews the relevant research on fault diagnosis of power converters based on symmetry in recent years, analyzes the mathematical principles of these methods, and compares their diagnostic performance. In addition, two factors that may have an influence on the symmetry are pointed out. This paper provides references and suggestions for the future development and research of power converter fault diagnosis. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Power Electronics)
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