A low-speed generator for energy conversion from marine currents — experimental validation of simulations

Thomas, Karin; Grabbe, Mårten; Yuen, Katarina; Leijon, Mats

doi:10.1243/09576509jpe567

Cited by 16 publications

(18 citation statements)

References 25 publications

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“…A few design choices are Nd 2 Fe 14 B magnets, 1 mm thick stator laminations and cable windings, and the generator has no cooling system. See Table I and [22] for more details. In this design process, the use of 'rated', or design power and speed differs somewhat from conventional use of the terms.…”

Section: A Electromagnetic Designmentioning

confidence: 99%

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Matching a Permanent Magnet Synchronous Generator to a Fixed Pitch Vertical Axis Turbine for Marine Current Energy Conversion

Yuen

Thomas

Grabbe

et al. 2009

IEEE J. Oceanic Eng.

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This is an author-produced version of a paper published in IEEE Journal of Oceanic Engineering. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the published paper: Yuen K., Thomas K., Grabbe M., Deglaire P., Bouquerel M., Österberg D., Leijon M. "Matching a permanent magnet synchronous generator to a fixed pitch vertical axis turbine for marine current energy conversion" IEEE Journal of Oceanic Engineering, 2009, 34(1) Access to the published version may require subscription. I. INTRODUCTIONF REE flow marine currents, i.e. unregulated water courses, tides and other ocean currents, are an energy resource yet to be utilized on a commercial scale. Without dams, this nonfossil source can give an environmentally benign contribution to the world electricity production. The European tidal potential alone has been estimated to be 39-58 TWh annually [1]- [3]. A number of projects involved with extracting energy from this resource exist, and most concepts are similar to wind energy converters in that they include a turbine and a generator, e.g. [4]- [7].Wind power is similar to marine current energy as it is concerned with harnessing the kinetic energy in a flowing fluid, and there are many relevant comparisons concerning underlying physics, practical engineering experience, etc. However, there are also a number of significant differences, e.g. resource characteristics. As most parts of the system will be submerged in water and thus not easily accessible, it is good to try to minimize needs for maintenance and repair by avoiding mechanically complex systems with many moving parts. In [8], it is concluded that up to 20 percent of the downtime for a wind power plant is due to gearbox failures, and that the majority of these failures are due to wear. Therefore, avoiding gearboxes, yawing and blade pitching is likely to be beneficial Manuscript

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Section: A Electromagnetic Designmentioning

confidence: 99%

“…The load can be varied between 10 and 2.7 Ω per phase. The experimental setup is described further in [22].…”

Section: B Experimental Setupmentioning

confidence: 99%

Matching a Permanent Magnet Synchronous Generator to a Fixed Pitch Vertical Axis Turbine for Marine Current Energy Conversion

Yuen

Thomas

Grabbe

et al. 2009

IEEE J. Oceanic Eng.

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“…In this study, an in-house developed program Ace (developed at ABB AB, Coporate Research, Västerås, Sweden) was used to model the magnetic circuit of the LG [50]. The software solves Maxwell's equations for a two-dimensional segment of a generator using FEM, approximating a constant field in the axis of the conductor windings and simulating each magnet as a closed current The aim of this paper is to discuss an altered magnetic circuit of a PMLG for wave energy conversion.…”

Section: Theory and Methodsmentioning

confidence: 99%

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

et al. 2017

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The wave energy converter (WEC) studied and developed at Uppsala University in Sweden is a point absorbing buoy connected to a linear generator (LG) on the seabed. Previous studies have improved the sustainability of the generator, changing its magnets from Nd 2 Fe 14 B-magnets to ferrites. In this paper, the magnetic circuit of the linear generator is further studied. Ferrite magnets of two different types (Y30 and Y40) are studied along with different shapes of pole shoes for the system. The finite element method (FEM) simulations in a program called Ace are performed. The results show that a linear generator including both Y30 and Y40 magnets and shortened T-shaped pole shoes can generate a similar magnetic energy in the airgap as a linear generator only containing Y40 magnets and rectangular pole shoes. This shows that the magnetic circuit can be altered, opening up sizes and strengths of magnets for different retailers, and thereby possibly lowering magnet cost and transportation. This work was previously presented as a conference at the European Wave and Tidal Energy Conference (EWTEC) 2017 in Cork, Ireland; this manuscript has been carefully revised and some discussions, on magnet costs for example, have been added to this paper.

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“…The generator design for the Söderfors station is based on the laboratory prototype described earlier [8]. To ease production, the outer diameter of the stator was reduced to 1800 mm.…”

Section: 3mentioning

confidence: 99%

Implementation of Control System for Hydrokinetic Energy Converter

Yuen

Apelfröjd

Leijon

2013

Journal of Control Science and Engineering

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At Uppsala University, a research group is investigating a system for converting the power in freely flowing water using a vertical-axis turbine directly connected to a permanent magnet generator. An experimental setup comprising a turbine, a generator, and a control system has been constructed and will be deployed in the Dalälven river in the town of Söderfors in Sweden. The design, construction, simulations, and laboratory tests of the control system are presented in this paper. The control system includes a startup sequence for the turbine and load control. These functions have performed satisfactorily in laboratory tests. Simulations of the system show that the power output is not maximized at the same tip-speed ratio as that which maximizes the turbine power capture.

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A low-speed generator for energy conversion from marine currents — experimental validation of simulations

Cited by 16 publications

References 25 publications

Matching a Permanent Magnet Synchronous Generator to a Fixed Pitch Vertical Axis Turbine for Marine Current Energy Conversion

Matching a Permanent Magnet Synchronous Generator to a Fixed Pitch Vertical Axis Turbine for Marine Current Energy Conversion

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

Implementation of Control System for Hydrokinetic Energy Converter

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