EU

WP4 COMBINED HARVESTING OF OPEN SEA RENEWABLE ENERGY
(RTD)

PROJECT DELIVERABLES AND DISSEMINATION

D4.1 Report assessment of wind turbine typesmore info

LEAD PARTNER:

Cranfield University

NATURE: REPORT

DISSEMINATION: PUBLIC

SCHEDULED: JAN/2014

ACHIEVED: MAR/2014

This report describes the assessment of different wind turbine configurations, and details the optimisation of the turbine characteristics, as part of work package 4, Task 4.1. Through initial scoping discussions it was agreed that the target maximum electrical power delivered to the central platform, i.e. at optimum operating conditions for the WEC and VAWT units, would be 500MW. A number of units, comprising a WEC with one or more VAWTs mounted on top of the WEC support platform, would be required to deliver this target power. The Atlantic site was selected as the primary design location and it was suggested that 100 5MW integrated WEC-VAWT units would be required as a baseline. It was also assumed that losses associated with the PTO system are 20% (i.e. in converting mechanical to electrical power), which will be refined when more details of the PTO design become available. This report describes the optimisation of the VAWT shape on a stationary platform located at the Atlantic site. Subsequently, scale factors were determined to re-size the Atlantic VAWT for the North Sea and Mediterranean sites such that the AEY was similar for each site. This gave a North Sea turbine that was 21% smaller (in terms of swept area) than the Atlantic turbine and a Mediterranean turbine that was 7% larger. However, due to poorer wind and wave resources in the Mediterranean a greater number of hybrid WEC-VAWT units are required to achieve the generation target in the Mediterranean.

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Version: vfinal - Pages: 34

D4.2 Report defining mechanical design of VAWT and PTO...more info

LEAD PARTNER:

Cranfield University

NATURE: PROTOTYPE

DISSEMINATION: PUBLIC

SCHEDULED: JAN/2014

ACHIEVED: OCT/2014

The elastomeric power take off system (EPTO) has been analysed and developed, considering first of all in general the hydraulic transmission for wind turbines, then the EPTO design and operating conditions, the transmission systems, and at the end an illustration of the simulation of flow and pressure based on VAWT mechanical torque power output is given. It has been demonstrated that the EPTO system, initially considered promising as it was also fulfilling the requirement to provide pressurised sea water to the electrolyser, it is not the most suitable system: its efficiency is very low if compared with conventional PTO systems, and the requirement to provide pressurised sea water was eventually dropped as it has been decided by the consortium that the electrolyser will not be accommodated anymore in the hybrid WEC/VAWT platform. The results of the preliminary sizing have been illustrated, presenting the estimated masses and relative approx costs of the main elements of the VAWT rotor, the braking system and the bearing system. As expected, the VAWT system designed for the most (wind) energetic site (North Sea) is the lightest and cheapest among the three systems considered (the other two being for the Atlantic site and the Mediterranean site).

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Version: vfinal - Pages: 72.

D4.3 Recommendations for installation requirements on platformmore info

LEAD PARTNER:

Cranfield University

NATURE: PROTOTYPE

DISSEMINATION: PUBLIC

SCHEDULED: JAN/2014

ACHIEVED: OCT/2014

In order to integrate the 5 MWe VAWT and the relative PTO in the P80 WEC platform, it is necessary to estimate the loads that will be transmitted by the VAWT and PTO to the WEC platform and to propose a configuration to interface the VAWT and PTO with the P80. The design of the P80 WEC by FPP needs to be modified in order to accommodate the 5 MWe VAWT and the relative PTO. The current WEC P80 mooring system is a turret mooring system, allowing the platform to freely rotate around the vertical axis and therefore self-align against the main wave front direction. Therefore, three concepts solutions have been investigated and are described in this deliverables. For the present project, due to the lack of data for the concept 3, concept 2 (90⁰ gearbox) has be adopted in the model to assess the environmental impact of the VAWT.

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Version: vfinal - Pages: 21

D4.4 Seakeeper calculations reportmore info

LEAD PARTNER:

IT Power

NATURE: REPORT

DISSEMINATION: CONFIDENTIAL

SCHEDULED: JAN/2014

ACHIEVED: -

This document defines the parameters that will determine the loading due to environmental effects on the floating structures which make up the H2Ocean System. The H2Ocean System includes the service module, wave and wind energy converters, aquaculture installations, moorings, and mechanical, electrical and process connections between structures. A brief analysis of the modelled platform motions was carried out to assess the seakeeping properties of the floating platform. The effect of the motion response of the platform on the wind turbine was investigated for one load case. Results suggested that the pitching, and possibly rolling motions of the platform are likely to have an impact on the wind turbine availability. Similarly, situations may arise in severe operational sea states where the large platform motion may induce a shutdown in the WEC system whilst the VAWT continues to operate. A more thorough investigation into this, looking at multiple load cases, would be required to draw any firm conclusions. It was also found that the motions of the platform in moderate seas are likely to make carrying out some maintenance tasks on the platform difficult. Depending on the type of maintenance task and the location of works on the platform, tasks may require scheduling based on the sea state. The motion and load results from the load cases will be suitable to carry out the majority of the structural design of the floating platform. To fully comply with DNV guidance, additional load cases which include transient wind conditions should be defined, and wave impact loads should be modelled.

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Version: RESTRICTED - Pages: RESTRICTED

WP4 Disseminationmore info

ARTICLE

Full Article, “Offshore floating vertical axis wind turbines, dynamics modelling state of the art. Part I: Aerodynamics,
Renewable and Sustainable Energy Reviews”, doi:10.1016/j.rser.2014.07.096

ARTICLE

Full Article, “Offshore floating vertical axis wind turbines, dynamics modelling state of the art. Part II: Mooring line
and structural dynamics, Renewable and Sustainable Energy Reviews”, doi:10.1016/j.rser.2014.07.122

ARTICLE

Full Article, “Offshore floating vertical axis wind turbines, dynamics modelling state of the art. Part III: Hydrodynamcis
and coupled modelling approaches, Renewable and Sustainable Energy Reviews”, doi:10.1016/j.rser.2014.10.100

ARTICLE

Full Article, “A comparison on the dynamics of a floating vertical axis wind turbine on three different floating support
structures”, doi:10.1016/j.egypro.2014.07.236

PRESENTATION

“A preliminary comparison on the dynamics of a floating vertical axis wind turbine on three
different floating support structures”, 11th Deep Sea Offshore Wind R&D Conference (Trondheim, January 2014)

PRESENTATION

“FloVAWT”, 1st VAWT Workshop, Roskilde (Denmark, June 2014)

PRESENTATION

“Code-to-code verification of two coupled model of dynamics for floating VAWTs”, 1st VAWT Workshop,
Roskilde (Denmark, June 2014)

PRESENTATION

“Development of a Coupled Model of Dynamics for Floating Vertical Axis Wind Turbines”, 5th UK Marine
Technology Postgraduate Conference (June 2014)

PRESENTATION

“Development of a Coupled Model of Dynamics for Floating Vertical Axis Wind Turbines”, 33rd International
Conference on Ocean, Offshore and Arctic Engineering (San Francisco, June 2014)

PRESENTATION

“Development of a Wind-Wave Power Open-Sea Platform Equipped for Hydrogen Generation with Support
for Multiple Users of Energy”, Offshore Energy 2014 (Amsterdam, October 2014)

PRESENTATION

"The Use of Hybrid Wind- and Wave-Energy Devices within the H2Ocean Multi-Purpose Offshore Platform”,
Offshore Energy 2014 (Amsterdam, October 2014)

PRESENTATION

“Application of the Aero-Hydro-Elastic Model, HAWC2-WAMIT, to Offshore Data from Floating Power Plants
Hybrid Wind- and Wave-Energy Test Platform, P37”, 5th International Conference on Ocean Energy (ICOE2014)
(Halifax, Canada, Nov. 2014)

POSTER

“Offshore Floating Vertical Axis Wind Turbines” Event: International Network of Offshore Renewable Energy Europe
Symposium 2014, Cantabria, May 2014

POSTER

“FloVAWT: Development of a Coupled Dynamics Design Tool for Floating Vertical Axis Wind Turbines” Event: 11th Deep
Sea Offshore Wind R&D Conference