Design proposal of electrical system for linear generator wave power plants

Boström, Cecilia; Svensson, Olle; Rahm, Magnus; Lejerskog, Erik; Savin, Andrej; Strömstedt, Erland; Engström, Jens; Gravråkmo, Halvar; Haikonen, Kalle; Waters, Rafael; Bjorklof, D.; Johansson, Tim; Sundberg, Jan; Leijon, Mats

doi:10.1109/iecon.2009.5414903

Cited by 23 publications

(11 citation statements)

References 13 publications

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“…From the wave park experiments at the LRS in 2009 papers have been published on the offshore underwater substation [16], the electrical system and control of the wave power park [17][18][19], the control and measurement system used in the offshore underwater substation [20], and on temperature measurements inside WEC L2 and the offshore underwater substation [21], among others.…”

Section: The Lysekil Research Sitementioning

confidence: 99%

A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor

Strömstedt

Svensson

Leijon

2012

ISRN Renewable Energy

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A concept for offshore wave energy conversion is being developed at the Swedish Centre for Renewable Electric Energy Conversion at Uppsala University in Sweden. The wave energy converter (WEC) in focus contains a piston rod mechanical lead-through transmission for transmitting the absorbed mechanical wave energy through the generator capsule wall while preventing seawater from entering the capsule. A set-up of 7 laser triangulation sensors has been installed inside the WEC to measure relative displacement of the piston rod and its corresponding seal housing. A draw-wire sensor has also been set up to measure translator position and the axial displacement of the piston rod. The paper gives a brief introduction to the Lysekil research site, the WEC concept, and the direct drive of WEC prototype L2. A model of operation for the piston rod mechanical lead-through transmission is given. The paper presents sensor choice, configuration, adaptation, mounting, and measurement system calibration along with a description of the data acquisition system. Results from 60 s measurements of nominal operation two months apart with centered moving averages are presented. Uncertainty and error estimations with statistical analyses and signal-to-noise ratios are presented. Conclusions are drawn on the relative motions of the piston rod and the seal housing under normal operating conditions, and an assessment of the applicability of the measurement system is made.

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Section: The Lysekil Research Sitementioning

confidence: 99%

A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor

Strömstedt

Svensson

Leijon

2012

ISRN Renewable Energy

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“…One unit can deliver a limited amount of power. Therefore, several units need to be deployed to achieve a required installed capacity [3]. The WECs can be connected to either an underwater substation or to a common connection point of the power cable.…”

Section: Introductionmentioning

confidence: 99%

Offshore Deployments of Wave Energy Converters by Seabased Industry AB

Chatzigiannakou

Temiz

Leijon

2017

JMSE

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Since 2008, Seabased Industry AB (SIAB) has manufactured and deployed several units of wave energy converters (WECs) of different design. The WECs are linear generators with point absorber buoy systems that are placed on the seabed, mounted on a gravitation concrete foundation. These deployments have taken place in different areas, using different deployment vessels. Offshore deployments of WECs and underwater substations have so far been complicated procedures, that were both expensive and time-consuming. The focus of this paper is to discuss these deployments in terms of economy and time efficiency, as well as safety. Because seven vessels have been used to facilitate the deployments, an evaluation on the above basis is carried out for them. The main conclusions and certain solutions are presented for the various problems encountered during these deployments and the vessel choice is discussed. It is found that the offshore deployment process can be optimized in terms of cost, time efficiency and safety with a careful vessel choice, use of the latest available technologies and detailed planning and organizing.

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“…In addition, relevant control and measurement systems, such as a marine substation [3], have also been developed and tests have been carried out on the WECs' performances [4]. Collateral research areas include a tidal effect compensator [5], remote operation vehicle (ROV) connections [6], a study of the thermal properties of the power system [7], and management on the deployment [8].…”

Section: Introductionmentioning

confidence: 99%

Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter

2016

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Abstract:The Lysekil wave energy converter (WEC), developed by the wave energy research group of Uppsala University, has evolved through a variety of mechanical designs since the first prototype was installed in 2006. The hundreds of engineering decisions made throughout the design processes have been based on a combination of theory, know-how from previous experiments, and educated guesses. One key parameter in the design of the WECs linear generator is the stroke length. A long stroke requires a taller WEC with associated economical and mechanical challenges, but a short stroke limits the power production. The 2-m stroke of the current WECs has been an educated guess for the Swedish wave climate, though the consequences of this choice on energy absorption have not been studied. When the WEC technology is considered for international waters, with larger waves and challenges of energy absorption and survivability, the subject of stroke length becomes even more relevant. This paper studies the impact of generator stroke length on energy absorption for three sites off the coasts of Sweden, Chile and Scotland. 2-m, 4-m, and unlimited stroke are considered. Power matrices for the studied WEC prototype are presented for each of the studied stroke lengths. Presented results quantify the losses incurred by a limited stroke. The results indicate that a 2-m stroke length is likely to be a good choice for Sweden, but 4-m is likely to be necessary in more energetic international waters.

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Design proposal of electrical system for linear generator wave power plants

Cited by 23 publications

References 13 publications

A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor

A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor

Offshore Deployments of Wave Energy Converters by Seabased Industry AB

Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter

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