Advancements in Machines and Power Converters for Renewable Power Generation

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Electromechanical Energy Conversion Systems".

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 2908

Special Issue Editors


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Guest Editor
Department of Electrical Engineering, Faculty of Engineering, University of Malta, MSD 2080 Msida, Malta
Interests: control of power electronic converters applied to renewable energy sources; smart grids; power systems; power quality and energy efficiency
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Industrial Electrical Power Conversion, University of Malta, MSD 2080 Msida, Malta
Interests: design, analysis and thermal management of electrical machines and drives; reliability of electrical machines; insulation degradation and lifetime consumption of electrical machines
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Machine drives, including the machine, the associated power electronic converters and their control, play a very important role in converting renewable energy into usable electrical energy. New technological advances in such systems are helping to convert renewable energy more efficiently and reliably. Various new families, topologies and technologies have recently been introduced, and are constantly being improved. In fact, the trend of creating flexible design processes that simultaneously allow for component-level, sub-system-level and system-level design is becoming ever more important, as developers and end-users look to achieve the optimal performance possible.

Application-oriented design processes are also changing. While certain technologies are inherently more suited to a particular application, there is currently also a trend to investigate the adaption of technologies across application areas.

This Special Issue is thus intended for researchers and practitioners to share their latest research findings and limitations that can be addressed in future research in machines and power converters for renewable power generation. Research including experimental validation or field testing is highly encouraged for submission. Position papers and state-of-the-art reviews are also welcomed. 

This Special Issue invites papers that cover topics including but not limited to the following:

  • Advances in machine design (power density, efficiency, robustness, etc.);
  • Advances in drive and power electronic converter topologies (new, high voltage, efficiency, resilient, fault tolerant, power take-off, etc.);
  • Advances in system and component reliability-oriented design aspects (general life consumption and degradation of machines and power converters, general lifetime predictions of machines and converters, conditioning monitoring, prediction and assessment of failures, insulation degradation, etc.);
  • Advances in design strategies for applying and implementing technologies across disciplines and/or renewable areas;
  • Advances in control strategies (high performance, estimation of non-measurable parameters, mitigation of loads, grid integration and grid support, etc.).

Dr. John Licari
Prof. Dr. Michael Galea
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. 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

  • electrical machines and drives
  • power electronic converter
  • smart grids
  • power systems
  • renewable power generation

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Published Papers (2 papers)

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Research

18 pages, 6785 KiB  
Article
Impact of Installation Deviations on the Dynamic Characteristics of the Shaft System for 1 Gigawatt Hydro-Generator Unit
by Gangyun Song, Xingxing Huang, Haijun Li, Zhengwei Wang and Dong Wang
Machines 2024, 12(7), 473; https://doi.org/10.3390/machines12070473 - 12 Jul 2024
Viewed by 660
Abstract
The shaft system, transferring the kinetic energy of water flow into electrical energy, is the most critical component in hydropower plants. Installation deviations of the shaft system for a giant hydro-generator unit can have significant impacts on its dynamic characteristics and overall performance. [...] Read more.
The shaft system, transferring the kinetic energy of water flow into electrical energy, is the most critical component in hydropower plants. Installation deviations of the shaft system for a giant hydro-generator unit can have significant impacts on its dynamic characteristics and overall performance. In this investigation, a three-dimensional geometry of the shaft system of an operating hydro-generator unit prototype with a rated power of 1 GW is established. Then, the calculation model of the shaft system is generated accordingly with tetrahedral and hexahedral elements. By applying different boundary conditions, the finite-element method is used to analyze the influences of installation deviations, including shaft radial misalignment and angular misalignment, on the dynamic characteristics of the shaft system. The calculation results reveal that the installation deviations change the natural frequencies, critical speeds, and mode shapes of the shaft system to a certain degree. The natural frequencies of the backward precession motion with installation deviations are reduced by 23% and 38% for the rated speed and the maximum runaway speed. Furthermore, for the forward precession motion, they increased by 30% and 48%, respectively. The critical speeds for the shaft system with radial and angular deviations are 3.2% and 3% larger than the critical speed of the shaft system without any mounting deviations. The radial and angular installation deviations below the maximum permissible values will not result in the structural performance degradation of the 1 GW hydro-generator shaft system. The conclusion drawn in this research can be used as a valuable reference for installing other rotating machinery. Full article
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15 pages, 660 KiB  
Article
Torque Ripple and Mass Comparison between 20 MW Rare-Earth and Ferrite Permanent Magnet Wind Generators
by Trung-Kien Hoang, Lionel Vido and Celia Tchuanlong
Machines 2023, 11(12), 1063; https://doi.org/10.3390/machines11121063 - 30 Nov 2023
Viewed by 1713
Abstract
This article investigates the comparison between two configurations of 20 MW offshore synchronous wind generators using ferrite and rare-earth permanent magnets. The optimization-based comparison concerns the torque ripple and active mass, which are two crucial criteria for offshore wind generators. Both generators adopt [...] Read more.
This article investigates the comparison between two configurations of 20 MW offshore synchronous wind generators using ferrite and rare-earth permanent magnets. The optimization-based comparison concerns the torque ripple and active mass, which are two crucial criteria for offshore wind generators. Both generators adopt surface-mounted permanent magnet type with direct-drive technology to avoid problems associated with the gearboxes. The result shows that at the full-load condition, the ferrite permanent magnet generator can reduce the torque ripple to as much as 0.12%, while the rare-earth counterpart can be about 2.5 times lighter than the former one. Full article
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