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Machines
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Advances in High-Power Converters
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Advances in High-Power Converters

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Electrical Machines and Drives".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 11126

Special Issue Editor

Dr. Dmitry Baimel

E-Mail Website
Guest Editor
Department of Electrical and Electronics Engineering, Shamoon College of Engineering, Beer Sheba, Israel
Interests: energy and power engineering; electric machines and drives
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, the demand for high-power converters has been constantly increasing. They are widely used in industry, renewable energy generation stations and electrical transportation systems. The main applications include low- and medium-voltage motor drives; propulsion systems for ships, trains and electric vehicles; reactive power compensation systems; PV generation; high-voltage DC systems; and more.

Therefore, recently, academy and industry have invested a lot of money and efforts in extensive research for improvement and development of more efficient, reliable, fault-tolerant and cheaper high-power converters.

The aim of this Special Issue is to bring together original, theoretical and practical ideas, and future trends in the field of high-power converters. The topics include but are not limited to:

  • Topologies of high-power converters: design of new or improved topologies of high-power converters, including multilevel and modular converters within power range of KW to MW;
  • New design, modelling and analysis methods of high-power converters;
  • Advanced control methods of high-power converters, including analog or digital implementations;
  • Reliability of high-power converters;
  • Medium-voltage drives for AC motors;
  • Propulsion systems for ships, trains and electric vehicles;
  • High-power converters for renewable energy systems.

Dr. Dmitry Baimel
Guest Editor

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. Machines 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

  • high-power converters
  • multilevel converters
  • modular converters
  • control of high-power converters
  • design and modelling of high-power converters
  • propulsion systems

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Published Papers (5 papers)

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Research

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16 pages, 4411 KiB  
Article
Hardware-in-the-Loop Implementation of ROMAtrix, a Smart Transformer for Future Power Grids
by Amir Ostadrahimi and Stefano Bifaretti
Machines 2023, 11(2), 308; https://doi.org/10.3390/machines11020308 - 19 Feb 2023
Cited by 1 | Viewed by 1951
Abstract
The evolution of power generation brings about extensive changes in other parts of the grid, especially in the transmission and distribution components. Within the scope of the Internet of Energy (IoE), electric power flows more flexibly between different parts of the grid. DC [...] Read more.
The evolution of power generation brings about extensive changes in other parts of the grid, especially in the transmission and distribution components. Within the scope of the Internet of Energy (IoE), electric power flows more flexibly between different parts of the grid. DC power will play an essential role in IoE. Decentralized photovoltaic panels, energy storage, electric vehicle charging stations, and data centers are some of the significant components of future grids dealing with DC power. As a result, power transformers must be appropriately modified to manage power among the different parts of the grid. A power electronic transformer (PET), also known as a solid-state transformer (SST) or smart transformer (ST), is a solution enabling a power grid to deal with this growing complexity. ROMAtrix, as a matrix-converter-based ST, is a developing project targeting future power grids. ROMAtrix realizes the application of a medium voltage (MV) transformer using commercially available power electronic semiconductors. Due to the distinctive features of ROMAtrix and a high number of switches, the implementation of the control system using a single control board is highly demanding. This paper aims to illustrate the implementation, on a field-programmable gate array (FPGA), of pulse width modulation (SVMPWM) applied to the ROMAtrix, considering specific switching patterns. The proposed switching procedure was simulated with PLECS and validated with the hardware-in-the-loop using the OPAL-RT solver. Full article
(This article belongs to the Special Issue Advances in High-Power Converters)
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20 pages, 6071 KiB  
Article
Research on Fault Diagnosis of Six-Phase Propulsion Motor Drive Inverter for Marine Electric Propulsion System Based on Res-BiLSTM
by Jialing Xie, Weifeng Shi and Yuqi Shi
Machines 2022, 10(9), 736; https://doi.org/10.3390/machines10090736 - 27 Aug 2022
Cited by 9 | Viewed by 2050
Abstract
To ensure the implementation of the marine electric propulsion self-healing strategy after faults, it is necessary to diagnose and accurately classify the faults. Considering the characteristics of the residual network (ResNet) and bidirectional long short-term memory (BiLSTM), the Res-BiLSTM deep learning algorithm is [...] Read more.
To ensure the implementation of the marine electric propulsion self-healing strategy after faults, it is necessary to diagnose and accurately classify the faults. Considering the characteristics of the residual network (ResNet) and bidirectional long short-term memory (BiLSTM), the Res-BiLSTM deep learning algorithm is used to establish a fault diagnosis model to distinguish the types of electric drive faults. First, the powerful fault feature extraction ability of the residual network is used to deeply mine the fault features in the signals. Then, perform time-series learning through a bidirectional long short-term memory network, and further excavate the transient time-series features in the fault features so as to achieve the accurate classification of drive inverter faults. The effectiveness of the method is verified using noise-free fault data, and the robustness of the method is verified using data with varying degrees of noise. The results show that compared with conventional deep learning algorithms, Res-BiLSTM has the fastest and most stable training process, the diagnostic performance is improved, and the accuracy can be maintained over 95% under 25–19 dB. It has certain robustness and can be applied to marine electric propulsion systems drive inverter fault diagnosis, and its results can provide data support for the implementation of self-healing control strategies. Full article
(This article belongs to the Special Issue Advances in High-Power Converters)
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12 pages, 4588 KiB  
Communication
Baseline for Split DC Link Design in Three-Phase Three-Level Converters Operating with Unity Power Factor Based on Low-Frequency Partial Voltage Oscillations
by Yarden Siton, Vladimir Yuhimenko, Dmitry Baimel and Alon Kuperman
Machines 2022, 10(9), 722; https://doi.org/10.3390/machines10090722 - 24 Aug 2022
Cited by 6 | Viewed by 2089
Abstract
The study sets a baseline for split DC link capacitance values and voltage set points in three-phase three-level AC/DC (or DC/AC) converters operating with unity power factor. In order to equalize the average values of partial DC link voltages, the controller generates a [...] Read more.
The study sets a baseline for split DC link capacitance values and voltage set points in three-phase three-level AC/DC (or DC/AC) converters operating with unity power factor. In order to equalize the average values of partial DC link voltages, the controller generates a zero-sequence containing DC components only while employing neither dedicated DC link capacitance balancing hardware nor high-order zero-sequence component injection. Such a baseline is required in order to evaluate the effectiveness of different DC link capacitance reduction methods proposed in the literature. Unlike most previous works, utilizing neutral point current based on cumbersome analytical expressions to determine neutral point potential oscillations, the instantaneous power balance-based approach is employed in this paper, resulting in greatly simplified and more intuitive expressions. It is demonstrated that while the total DC link voltage is low-frequency ripple-free under unity power factor balanced AC-side operation, split DC link capacitors absorb triple-fundamental frequency power components with one-sixth load power magnitude. This yields significant opposite phase partial voltage ripples. In such a case, selection of DC link capacitances and voltage set points must take into account the expected values of AC-side phase voltage magnitude and split DC link capacitor voltage and current ratings. Simulation and experimental results validate the proposed methodology by application to a 10 kVA T-type converter prototype. Full article
(This article belongs to the Special Issue Advances in High-Power Converters)
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16 pages, 6659 KiB  
Article
An Improved Quasi-Z-Source Boost DC-DC Converter Using Single-Stage Switched-Inductor Boosting Technique
by Manoharan Premkumar, Chandran Ramakrishnan, Chandrasekaran Kumar, Ravichandran Sowmya, Thulasimani Ramalingam Sumithira and Pradeep Jangir
Machines 2022, 10(8), 669; https://doi.org/10.3390/machines10080669 - 9 Aug 2022
Cited by 6 | Viewed by 2397
Abstract
A modified single-stage Quasi-Z-Source (QZS) boost DC-DC converter using a single MOSFET switch with a single-stage switched-inductor (SI) network is proposed in this paper. The DC-DC converter proposed in this study provides an extra voltage gain compared to the traditional QZS DC-DC converter. [...] Read more.
A modified single-stage Quasi-Z-Source (QZS) boost DC-DC converter using a single MOSFET switch with a single-stage switched-inductor (SI) network is proposed in this paper. The DC-DC converter proposed in this study provides an extra voltage gain compared to the traditional QZS DC-DC converter. An additional capacitor and diode circuit are added to the existing QZS converter to decrease the voltage stress on the MOSFET switch. Therefore, compared to the traditional QZS boost converter, the proposed Modified QZS (MQZS) converter provides large voltage gain under a low duty ratio, less voltage stress, and continuous input current. Moreover, the reliability and the conversion efficiency can be increased. The derivation of the proposed MQZS converter and its operation, selection of parameters, and comparison with another similar converter are discussed in this paper. Lastly, the simulation and experimental results are illustrated to prove the notional deliberations of the proposed MQZS converter. Full article
(This article belongs to the Special Issue Advances in High-Power Converters)
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Review

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33 pages, 16669 KiB  
Review
Topological Overview of Auxiliary Source Circuits for Grid-Tied Converters
by Nissim Amar, Aviv Ziv, Pavel Strajnikov, Alon Kuperman and Ilan Aharon
Machines 2023, 11(2), 171; https://doi.org/10.3390/machines11020171 - 27 Jan 2023
Cited by 2 | Viewed by 1727
Abstract
This paper reviews different types of capacitors and auxiliary source circuit topologies and presents an introduction to control strategies used for circuit applications reducing DC-BUS capacitance. The paper argues in favor of replacing bulky electrolytic capacitors in capacitor-supported power electronic systems with auxiliary [...] Read more.
This paper reviews different types of capacitors and auxiliary source circuit topologies and presents an introduction to control strategies used for circuit applications reducing DC-BUS capacitance. The paper argues in favor of replacing bulky electrolytic capacitors in capacitor-supported power electronic systems with auxiliary source circuits. DC-BUS capacitors are widely used in grid-tied power converters (rectifiers) and utilized for power balance, voltage ripple limitation, and short-term energy storage. The electrolyte capacitor is the Achilles heel of any rectifier and power converter due to its higher rate of failure than other circuitry components. Auxiliary source circuits are key components to qualitatively improve the reliability of the DC links, where they divert the instantaneous pulsating power into extra reliable storage components. Unlike previous work, this review serves to provide a clear picture of an auxiliary source circuit design, in favor of optimal solution selection according to the specific application. Therefore, energy storage components (capacitors), topologies, and control strategies of auxiliary source circuits are comprehensively reviewed in this paper. Additionally, detailed explanations, comparisons, and discussions of auxiliary source circuits are offered. Full article
(This article belongs to the Special Issue Advances in High-Power Converters)
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