|Work package (WP)||WP Type||Title||Lead beneficiary|
|WP 2||DISS/OUT||Dissemination and Outreach||IST|
|WP 3||TR||Short Courses||ECN|
|WP 4||RTD||Environmental Monitoring Hardware||UU|
|WP 5||RTD||Farm Design, Implementation and O&M||FH-IWES|
|WP 6||RTD||Technology development||TECNALIA|
Work packages 4 to 6 contain the scientific work carried out within OceaNET. The realisation of the work to be undertaken in these WPs is carried out through the individual Early Stage Researcher Projects by each fellow.
Work package 4 focuses on a sonar/echo-sounding package for quantitative measurements of the occurrence of larger marine animals and schools of fish within and in the surrounding of the offshore farms. A hydrophone array will also be integrated into the package to measure sounds from wave or wind energy converters as well as ambient noise.
Sonar is standard equipment in marine applications, not the least in the fishing industry. Sonar, in normal applications, is used to scan down from the ocean surface, commonly from boats. However, as intended in this project, sonars are to be placed on the seabed and to scan upwards. Such a concept has been tried out in a few pilot studies but no special designed concept has been developed which could be used in standardized systems.
|Work package 4||Environmental Monitoring Hardware||Host Institution||Fellow|
|Task 4.1||Sonar for environmental monitoring||UU||ESR 5|
Work package 5 aims to improve the conceptual approach, design and O&M of offshore wind and wave farms in terms of costs and safety.
Design of offshore renewable energy farms
The design of offshore wind or wave energy farms includes deciding upon the type of FOWT or WEC, farm layout (moorings and electrical connections), constraints on distance between nearby devices resulting from hydrodynamic/aerodynamic interference, safety, operational considerations related to removing units for maintenance and cost of electrical cabling, etc.
Offshore farms operation & maintenance (O&M
O&M may represent as much as 40% of the total unit energy cost in offshore renewable energy farms. This being the single major cost item indicates that a significant effort should be placed in developing management tools to increase O&M efficiency and safety and reduce costs. Such tool should integrate operation management, maintenance management, condition monitoring, maritime safety and environmental safety in a single package. This is the purpose of one of OTS products (product 4) based on existing methodologies and tools. However it is clear that there is room to improve the components of such management tool, in particular i) the forecast of environmental conditions (wave, wind and currents) and its use in forecasting energy production and planning maintenance operations and ii) the condition monitoring system, including fatigue forecast. These are the two topics to be developed in three research projects within OceaNET which will be developed in close collaboration. EDP will bring their utility vision, Hidromod their expertise in metocean forecast and maritime traffic surveillance, Critical Software in software development, Critical Materials in CMS and maintenance plans, UNEXE in offshore operations and Woelfel in condition and structural monitoring.
|Work package 5||Farm Design, Implementation and O&M||Host Institution||Fellow|
|Task 5.1||Optimisation of offshore renewable energy farms||ECN||ESR 10|
|Task 5.2||Reliable and cost effective offshore operations for farm development and operation||UNEXE||ESR 11|
|Task 5.3||Innovative concepts for wave energy devices||WavEC||ESR 2|
|Task 5.4||Wind & wave forecast for farm O&M||WavEC||ESR 1|
|Task 5.5||Operation & maintenance strategies: design & optimisation||UC||ESR 9|
|Task 5.6||Condition monitoring & fatigue||Fraunhofer-IWES||ESR 7|
Work package 6 will concentrate on the development of enabling technologies, namely in electrical underwater connectors and support remotely operated vehicles ROVs, power take-off (PTO) systems, combined wind and wave platforms and enhanced modelling tools and methodologies for floating offshore wind turbines.
Electrical underwater connections and substations
The technological solutions for electrical connections and substations in deep waters may evolve to floating or submerged substations since offshore farms will be deployed at deeper waters where the fixed foundation solutions will be more expensive. For this purpose cheap and reliable electrical connectors (either wet-mateable or dry-mateable) designed for suitable range of water depth and voltage and current capacities, will be necessary. For the installation of connectors and its regular O&M there will be a need for ROVs/AUVs, which for deep waters is probably the cheapest, most secure and quickest solution. Large ROVs are currently used in the offshore oil and gas industry for digging, wiring and cable connecting etc., but these are very expensive for the offshore renewable energy industry. Thus the challenge, to be pursued in OceaNET, is to develop handling capabilities and connection methodologies for light and cheap ROVs, even if these lead to a larger number of connectors.
Development of new improved PTO equipment for OWC
Oscillating Water Columns (OWC) power plants are possibly the most studied type of wave energy converters and can be used both for nearshore bottom standing applications or offshore floating applications. The advantage of OWC technology is the inexistence of moving parts of the structure and a very cheap, simple, compact and reliable power take-off system (the air turbine and coupled electrical generator). The drawback of the OWC technology is the limited efficiency of the air turbines (typical solutions of these are the Wells and Impulse turbines). This problem is however being overcome with the new bi-radial turbine under development at IST. This turbine has a higher maximum efficiency and wider flow rate acceptance than its competitors.
Modelling tools and methodologies for floating offshore wind turbines and combined wind and wave platforms
Floating offshore wind turbines (FOWT) suffer from complex process interactions related to the wave-structure interactions, which are responsible for inducing platform (and turbine) oscillations. The development of FOWT demands improved and more complex (numerical and experimental) modelling tools and protocols. In this early stage of development there is also an opportunity to investigate combined wave and wind energy in the same platform thus sharing costs and maritime space.
|Work package 6||Technology development||Host Institution||Fellow|
|Task 6.1||Development of underwater electrical sub-systems and support ROV||UU||ESR 6|
|Task 6.2||AUV for underwater electrical sub-system||IST||ESR 4|
|Task 6.3||Novel bi-radial air turbine integration in floating OWC||IST||ESR 3|
|Task 6.4||Power quality and energy storage in OWC plants||TECNALIA||ESR 12|
|Task 6.5||Modelling tools & methodologies for floating offshore wind turbines||MARIN||ESR 8|
|Task 6.6||Combined wind & wave platforms||UCC-HMRC||ESR 13|