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Machines
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Advances in Machinery for Renewable Power Generation
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Advances in Machinery for Renewable Power Generation

A special issue of Machines (ISSN 2075-1702).

Deadline for manuscript submissions: closed (1 May 2014) | Viewed by 49745

Special Issue Editor

Prof. Dr. George Aggidis

E-Mail Website
Guest Editor
Department of Engineering, Lancaster University, Lancaster LA1 4YR, UK
Interests: wave energy; tidal power; hydro power; hydraulic design; centrifugal pumps; water turbines; energy efficiency; computational fluid dynamics; materials for fluid machinery and energy policy

Special Issue Information

Dear Colleagues,

Machinery for Renewable Power Generation has gone through several technological advances. This special issue will address the new frontiers and the state of the art of renewable energy technologies and their power generation machinery, design complexity, costs, energy and operational limitations. It provides a forum for the presentation of new research, development and applications of renewable power generation machinery. Demonstrations and experimentally based research are particularly welcome. Research that explores issues where the characteristics of the renewable energy source impact on the power conversion and where the wider system control or operation are central to the challenge of integration are particularly encouraged including energy storage. This special issue is technology focused covering design, demonstration, modelling and analysis, but papers covering techno-economic issues are also welcome. The purpose of this special issue is to reflect the state of the art in challenges faced by renewable power generation machinery developers and present the most important and relevant advances to overcome the challenges.

This special issue invites papers that cover the following topics of interest (but not limited to these):

• Generic & Applied Research on Renewable Power Generation Fluid / Electrical Machinery
• Computational & Experimental Modelling
• Device Development & Power take off
• Computational Fluid Dynamics & Control
• Economics & Condition Monitoring

Position papers and state of the art reviews are especially welcome.

Dr. George A. Aggidis
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.

Published Papers (5 papers)

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Research

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1668 KiB  
Article
Fractional Slot Concentrated Windings: A New Method to Manage the Mutual Inductance between Phases in Three-Phase Electrical Machines and Multi-Star Electrical Machines
by Olivier Barre and Bellemain Napame
Machines 2015, 3(2), 123-137; https://doi.org/10.3390/machines3020123 - 10 Jun 2015
Cited by 9 | Viewed by 9568
Abstract
Mutual inductance is a phenomenon caused by the circulation of the magnetic flux in the core of an electrical machine. It is the result of the effect of the current flowing in one phase on the other phases. In conventional three-phase machines, such [...] Read more.
Mutual inductance is a phenomenon caused by the circulation of the magnetic flux in the core of an electrical machine. It is the result of the effect of the current flowing in one phase on the other phases. In conventional three-phase machines, such an effect has no influence on the electrical behaviour of the device. Although these machines are powered by power inverters, no problem should occur. The result is not the same for multi-star machines. If these machines are using a conventional winding structure, namely distributed windings, and are powered by voltage source converters, current ripples appear in the power supply lines. These current ripples are related to magnetic couplings between the stars. Designers should check these current ripples in order to stay within the limits imposed by the specifications. These electric current disturbances also provide torque ripples. With concentrated windings, a new degree of freedom appears; the configuration—number of slots/number of poles—can have a positive impact. The circulation of the magnetic flux is the initial phenomenon that produces the mutual inductance. The main goal of this discussion is to describe a design method that is able to produce not only a machine with low mutual inductance between phases, but also a multi-star machine where the stars and the phases are magnetically decoupled or less coupled. This discussion only takes into account the machines that use permanent magnets mounted on the rotor surface. This article is part of a study aimed at designing a high efficiency generator using fractional-slot concentrated-windings (FSCW). Full article
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
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2001 KiB  
Article
Effect of Short-Circuit Faults in the Back-to-Back Power Electronic Converter and Rotor Terminals on the Operational Behavior of the Doubly-Fed Induction Generator Wind Energy Conversion System
by Dimitrios G. Giaourakis and Athanasios N. Safacas
Machines 2015, 3(1), 2-26; https://doi.org/10.3390/machines3010002 - 27 Feb 2015
Cited by 16 | Viewed by 10705
Abstract
This paper deals with the operational behavior of the Doubly-Fed Induction Generator Wind Energy Conversion System under power electronic converter and rotor terminals faulty conditions. More specifically, the effect of the short-circuit fault both in one IGBT of the back-to-back power electronic converter [...] Read more.
This paper deals with the operational behavior of the Doubly-Fed Induction Generator Wind Energy Conversion System under power electronic converter and rotor terminals faulty conditions. More specifically, the effect of the short-circuit fault both in one IGBT of the back-to-back power electronic converter and in rotor phases on the overall system behavior has been investigated via simulation using a system of 2 MW. Finally, the consequences of these faults have been evaluated. Full article
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
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1031 KiB  
Article
A Complete Design of a Rare Earth Metal-Free Permanent Magnet Generator
by Petter Eklund, Stefan Sjökvist, Sandra Eriksson and Mats Leijon
Machines 2014, 2(2), 120-133; https://doi.org/10.3390/machines2020120 - 16 May 2014
Cited by 13 | Viewed by 9828
Abstract
The price of rare-earth metals used in neodymium-iron-boron (NdFeB) permanent magnets (PMs) has fluctuated greatly recently. Replacing the NdFeB PMs with more abundant ferrite PMs will avoid the cost insecurity and insecurity of supply. Ferrite PMs have lower performance than NdFeB PMs and [...] Read more.
The price of rare-earth metals used in neodymium-iron-boron (NdFeB) permanent magnets (PMs) has fluctuated greatly recently. Replacing the NdFeB PMs with more abundant ferrite PMs will avoid the cost insecurity and insecurity of supply. Ferrite PMs have lower performance than NdFeB PMs and for similar performance more PM material has to be used, requiring more support structure. Flux concentration is also necessary, for example, by a spoke-type rotor. In this paper the rotor of a 12 kW NdFeB PM generator was redesigned to use ferrite PMs, reusing the existing stator and experimental setup. Finite element simulations were used to calculate both electromagnetic and mechanical properties of the design. Focus was on mechanical design and feasibility of construction. The result was a design of a ferrite PM rotor to be used with the old stator with some small changes to the generator support structure. The new generator has the same output power at a slightly lower voltage level. It was concluded that it is possible to use the same stator with either a NdFeB PM rotor or a ferrite PM rotor. A ferrite PM generator might require a larger diameter than a NdFeB generator to generate the same voltage. Full article
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
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1724 KiB  
Article
Detailed Study of Closed Stator Slots for a Direct-Driven Synchronous Permanent Magnet Linear Wave Energy Converter
by Erik Lejerskog and Mats Leijon
Machines 2014, 2(1), 73-86; https://doi.org/10.3390/machines2010073 - 23 Jan 2014
Cited by 7 | Viewed by 11234
Abstract
The aim of this paper is to analyze how a permanent magnet linear generator for wave power behaves when the stator slots are closed. The usual design of stator geometry is to use open slots to maintain a low magnetic leakage flux between [...] Read more.
The aim of this paper is to analyze how a permanent magnet linear generator for wave power behaves when the stator slots are closed. The usual design of stator geometry is to use open slots to maintain a low magnetic leakage flux between the stator teeth. By doing this, harmonics are induced in the magnetic flux density in the air-gap due to slotting. The closed slots are designed to cause saturation, to keep the permeability low. This reduces the slot harmonics in the magnetic flux density, but will also increase the flux leakage between the stator teeth. An analytical model has been created to study the flux through the closed slots and the result compared with finite element simulations. The outcome shows a reduction of the cogging force and a reduction of the harmonics of the magnetic flux density in the air-gap. It also shows a small increase of the total magnetic flux entering the stator and an increased magnetic flux leakage through the closed slots. Full article
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
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Review

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1448 KiB  
Review
Design Analysis of a Novel Synchronous Generator for Wind Power Generation
by Tsuyoshi Higuchi, Yuichi Yokoi, Takashi Abe and Kazuki Sakimura
Machines 2014, 2(3), 202-218; https://doi.org/10.3390/machines2030202 - 18 Aug 2014
Cited by 5 | Viewed by 7804
Abstract
A novel synchronous generator is proposed for wind power generation. The field flux is generated by the half-wave rectified excitation method. The generator does not require slip rings and brushes for field power supply, as well as permanent magnets. In this paper, the [...] Read more.
A novel synchronous generator is proposed for wind power generation. The field flux is generated by the half-wave rectified excitation method. The generator does not require slip rings and brushes for field power supply, as well as permanent magnets. In this paper, the excitation method is explained, and then, the basic characteristics are calculated using the finite element method analysis. Furthermore, the generator is designed for increasing the output power and efficiency. Full article
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
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