Deployment and Maintenance of Wave Energy Converters at the Lysekil Research Site: A Comparative Study on the Use of Divers and Remotely-Operated Vehicles (original) (raw)
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Journal of Ocean Engineering and Technology, 2020
Of late, demand for sites and platforms to test the performance of marine equipment and underwater and surface robots during the development process has been increasing in South Korea. The Korea Research Institute of Ships and Ocean Engineering(KRISO) has performed unit performance and overall performance tests at the Jangmok wharf in Geoje-si, where the South Sea Research Institute (SSRI) of the Korea Institute of Ocean Science and Technology (KIOST) is located, and engaged in the development of a deep-sea remotely operated vehicle (ROV), Hemire, and an autonomous underwater vehicle (AUV), ISiMI 100 (Baek et al., 2008; Jun et al., 2009). Tests for the location estimation performance of underwater vehicles were also performed in the inland environment of Jangseongho in Jeollanam-do (Choi et al., 2019a). Defense industry companies carried out experiments for motion characteristic modeling of AUVs for underwater reconnaissance and hydrodynamic coefficient adjustment and experiments for performance verification in the real sea at the South Sea Research Institute wharf (Park et al., 2015; Lee et al., 2015). Other experiments, mostly for the development performance verification of individual maritime unmanned vehicles, are being carried out in the coastal sea of the Jinhae Naval Academy in Gyeongsangnam-do, the Korea Maritime and Ocean University wharf in Busan, the coastal sea of Pohang, Gyeongcheonho in Mungyeong, and Bangdongho in Daejeon (Jeollabuk-do, 2019). The sites mentioned above need to separately provide facilities required for test preparation, including space for maintenance and repair of test equipment on land including wharf facilities. The need and demand for performance verification in real sea environments is also increasing with the increasing levels of technology and equipment being developed.
Oceantec: sea trials of a quarter scale prototype
Although the first attempts to exploit wave energy go back to similar periods of other renewable energy sources, no particular technology has yet proved to be successful. Survivability in the ocean harsh environment will be one of the key features for commercial success of Offshore Wave Energy Converters.
SEAREV: Case study of the development of a wave energy converter
Renewable Energy, 2015
In this paper, technical and economical studies conducted on the SEAREV Wave Energy Converter (WEC) are presented. This technology was first proposed in 2002 with the aim of addressing critical challenges in wave energy conversion. It consists of a closed floating hull in which a heavy pendulum oscillates. The controlled relative motion of the pendulum is used to produce electricity.
Integration of wave energy converters into coastal protection schemes
2010
The purpose of this paper is to examine the feasibility of using wave energy converters for coastal protection through laboratory tests. The paper considers the case of a near-shore floating device of the Wave Activated Body type, named DEXA. The influence of the device length and of the wave parameters on device efficiency and on inshore wave transmission are investigated. A preliminary design procedure to optimise both device efficiency and wave transmission is proposed by means of an hypothetical application to the Adriatic coast. The effects induced by the device on coastal morphology are roughly estimated in terms of variation of longshore transport.
Wave Energy Research at Uppsala University and The Lysekil Research Site, Sweden: A Status Update
This paper provides a summarized status update of the Lysekil wave power project. The Lysekil project is coordinated by the Div. of Electricity, Uppsala University since 2002, with the objective to develop full-scale wave power converters (WEC). The concept is based on a linear synchronous generator (anchored to the seabed) driven by a heaving point absorber. This WEC has no gearbox or other mechanical or hydraulic conversion systems, resulting in a simpler and robust power plant. Since 2006, 12 such WECs have been build and tested at the research site located at the west coast of Sweden. The last update includes a new and extended project permit, deployment of a new marine substation, tests of several concepts of heaving buoys, grid connection, improved measuring station, improved modelling of wave power farms, implementation of remote operated vehicles for underwater cable connection, and comprehensive environmental monitoring studies.
International Journal of Renewable Energy Technology, 2020
Ocean waves are a huge, untapped source with a higher energy density than solar and wind energy. Over the years, numerous designs for ocean wave energy converter systems (OWECS) have been proposed. This paper provides a comprehensive review and assessment of currently available OWECS using technology readiness levels (TRLs) scale developed by the US Department of Energy. TRLs are used by numerous industries to assess technical maturity and functional readiness of new technologies. The study finds that there are 20 OWECS which are at various stages of technological development. Out of these, 14, five and two OWECS are intended for deployment at near-shore, offshore and onshore locations, respectively. The study shows that OWECS technology is diverse and relatively immature compared to solar and wind energy technology. Finally, the study reveals a lack of convergence towards a single OWECS that is capable of energy extraction from onshore , near-shore and offshore locations.
Renewable Energy, 2013
A general and widely applicable methodology to assess and present the performance of wave energy converters (WEC) based on sea trials is presented. It is meant to encourage WEC developers to present the performance of their WEC prototypes, on a transparent and equitable way while taking care of possible discrepancy in the observed performance of the WEC. Due to the harsh uncontrollable conditions of the sea that is encountered by WECs during sea trials, some of the performance of the WECs might be sub optimal and the data sets not fully complete. The methodology enables to filter the data by applying a selection criterion on the performance data that was obtained for a certain range of wave conditions. This selection criteria result in a subset of performance data representing the performance of the WEC for specific wave conditions, from which an average value an appreciation of the related uncertainty can be derived. This can lead to the estimation of the annual energy output of the WEC at its test location, while it also provides a method to estimate its annual energy output for another location of interest and possibly also at another scaling ratio. The same methodology can also be used to perform parametric studies with environmental or device dependent parameters and to analyse the power conversion chain from wave to wire, which both could lead to an enhanced understanding of the performance and behaviour of the WEC. The same methodology is also applicable to tidal devices or any other developing technologies that are used in an uncontrollable environment.
Development of an Adaptable Monitoring Package for marine renewable energy
OCEANS Conference, 2013
Environmental monitoring of marine renewable energy projects is needed to reduce environmental uncertainties and enable sustainable commercial implementations. An Adaptable Monitoring Package (AMP), along with the support infrastructure required to perform maintenance of the AMP, is being developed to enable real-time environmental monitoring of marine renewable energy converters. The monitoring capabilities supported by the AMP include marine animal interactions with converters, noise levels, current and wave fields, and water quality. The core instrumentation on the AMP is comprised of a hybrid stereo-optical and acoustical camera system, a localizing hydrophone array, acoustic Doppler current profilers and velocimeters, a water quality sensor, cetacean click detector, and fish tag receiver. For an initial deployment to monitor a tidal turbine in deep water, the AMP is integrated into the converter structure and connected to shore via the turbine export cable, but can be disconnected and recovered for maintenance independently of the turbine. The AMP is deployed by a SeaEye Falcon inspectionclass ROV and a custom tool skid. This paper describes the function, design, and dynamic stability of the AMP and deployment ROV. The conceptual design and approach to operations, to be confirmed through field testing, suggests that the AMP is likely
Ocean wave converters: State of the art and current status
2010 IEEE International Energy Conference, 2010
Solutions to today energy challenges need to be explored through alternative, renewable and clean energy sources to enable a diverse energy resource plan. An extremely abundant and promising source of energy exists in oceans. Ocean energy exists in many forms. Among these forms, significant opportunities and benefits have been identified in the area of ocean wave energy extraction, i.e., harnessing the wave motions and converting them into electrical energy.