Control of a Bristol cylinder for wave energy generation

Ngu, Sze Song; Dorrell, David G.; Acha, E.

doi:10.1109/ipec.2010.5542006

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…If the diode bridge is used then the machine should have low armature reaction. This is because the diode bridge acts in a similar manner to resistance connection as illustrated in [20]. If there is high armature reaction then the rectifier has to be controlled on order to maintain the terminal voltage.…”

Section: B Generator Connectionmentioning

confidence: 99%

“…The disadvantage to this is that the there is limited space available for the coil sides. This was explored in [20] and will be further reviewed here. If a diode bridge can be used this will simplify the system.…”

Section: B Generator Connectionmentioning

confidence: 99%

“…This allows a fractional slot winding with 8 poles and 9 slot or coil-side bundles in a similar manner to [20]. This gives the number of coils sides for 248 poles are 279.…”

Section: Machine Design Parametersmentioning

confidence: 99%

“…The wave energy can be determined by wave height, wave speed, wavelength, and water density. Using the standard equation for deep water conditions, the mean power per meter of wave front, P is[20][21]:…”

mentioning

confidence: 99%

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Outline design of a direct-drive low-speed brushless permanent-magnet generator for an ocean-going Bristol-cylinder type device

Dorrell

Ngu

Cossar

2012

2012 IEEE International Symposium on Industrial Electronics

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This paper describes the simple design rules that can be used to design direct-drive brushless generators for an ocean wave device. This is a very low speed device so the pole number and diameter is very large. While these machines may be large the pole pitch and axial length is low. The application is described and an air-gap wound design developed and simulated using analytical and finite element analysis techniques. A 248 pole design with surface rotor magnets is developed.

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Section: B Generator Connectionmentioning

confidence: 99%

Section: B Generator Connectionmentioning

confidence: 99%

“…This allows a fractional slot winding with 8 poles and 9 slot or coil-side bundles in a similar manner to [20]. This gives the number of coils sides for 248 poles are 279.…”

Section: Machine Design Parametersmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Outline design of a direct-drive low-speed brushless permanent-magnet generator for an ocean-going Bristol-cylinder type device

Dorrell

Ngu

Cossar

2012

2012 IEEE International Symposium on Industrial Electronics

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“…More recently alternative arrangements have been explored [16] with a view to adding practicality to capturing the power. Control of the Bristol cylinder has been considered in [17], though this considers the power electronic hardware rather than active control strategies.…”

Section: Introductionmentioning

confidence: 99%

Active control for multi-degree-of-freedom wave energy converters with load limiting

Hillis

Whitlam²,

Brask³

et al. 2020

Renewable Energy

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Experimental and numerical study on hydrodynamic performance of a wave energy converter using wave-induced motion of floating body

Peng

Lee

Mizutani

et al. 2015

Journal of Renewable and Sustainable Energy

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This paper presents results from experimental and numerical investigations on the wave potential extraction of an energy conversion device subjected to regular waves in intermediate water depth. The device is based on a pontoon-type floating breakwater with asymmetric mooring plates. The numerical model is built based on the Navier-Stokes solver coupled with immersed boundary method, volume of fluid method and the mechanics model of energy device. The data obtained in the laboratory investigation suggest that reactive control methods must be employed to optimize the load of the power take off system and maintain the wave energy converter near resonance, which plays an important role in capturing higher wave power. The energy conversion efficiency can reach 14% during experimental runs with only one dynamo installed. Furthermore, by comparing with the experimental results, the applicability of the developed numerical model is demonstrated in predicting the interactions between water waves and the wave power device. With the help of snapshots of water particle velocity field and the wave pressure field from numerical calculation, the flow pattern and external forces from the fluid field can also be estimated. Finally, the effects of mooring angle and the length of floating body on the performance of the energy device are highlighted.

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Control of a Bristol cylinder for wave energy generation

Cited by 7 publications

References 6 publications

Outline design of a direct-drive low-speed brushless permanent-magnet generator for an ocean-going Bristol-cylinder type device

Outline design of a direct-drive low-speed brushless permanent-magnet generator for an ocean-going Bristol-cylinder type device

Active control for multi-degree-of-freedom wave energy converters with load limiting

Experimental and numerical study on hydrodynamic performance of a wave energy converter using wave-induced motion of floating body

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