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Offshore wind into deeper water

Andrew Scott, Energy Technoligies Institute. Programme Manager Offshore Wind.

 

The Energy Technologies Institute (ETI) has examined potential options for the future United Kingdom 2050 energy mix. This modeling work has highlighted six key development priorities for the UK to ensure affordability, security and sustainability of energy services. Offshore renewables particularly Offshore Wind, is one of these development priorities. Our analysis shows that Offshore Wind is the critical hedging option in future system designs.

Aggressive cost reduction is critical to ensure the competitiveness of Offshore Wind. Our project work highlights cost reduction being delivered from combined improvements to turbine and blade design, installation and operations coupled with effective integration with the overall UK energy system design. In terms of a levelised cost of electricity (LCoE) and cost competitiveness for low carbon power technologies, we believe this potentially means achieving ~£85/MWh at onshore grid connection post 2020.

Our design studies also suggest there is the potential to engineer Offshore Wind systems that can meet this cost target by using large turbines in high wind areas near-shore to the UK. Water depths in these regions are mostly 60-120m and as a consequence floating installations are likely to be the preferred option. Therefore the ETI is currently investing in technology development and demonstration for large blades and floating platforms.

 

New offshore wind foundations

Dag Velund, Technical Manager OFFSHORE KINETICS AS

Future offshore wind farms will be developed further out, in deeper water and in harsher conditions.
This will require new approaches to safety, cost effective solutions and marine operations, all seen in a lifecycle perspective:

- HSE  : increasing focus in all phases
- unit costs: reduced, life cycle perspective thinking
- turbine performance: increasing
- locations: far offshore, deeper water
- maintenance: permanent presence of vessels/crew
- access/transfer systems: safer, lighter, faster

OFFSHORE KINETICS is currently developing solutions tailored to future development, operation and maintenance of far offshore windfarms, based on its extensive experience on planning and execution of marine operations, surface and subsea:

- wt-support structures for deep water: ready for start-up upon arrival at location
- maintenance systems: life cycle thinking based
- maintenance vessels: heavy mother vessel for up to 9 high-speed crew vessels (safe haven for  maintenance vessels and crew, also when performing heavy maintenance subsea and/or above sea level on any installation in the area)

This presentation will give an introduction to OFFSHORE KINETICS’ thinking and our concepts.

Concrete Star Wind Floater

Concrete Semisubmersible for Offshore Floating Wind

In response to an anticipated future demand for floating wind Dr.techn.Olav Olsen (OO) has developed a new and innovative concept: "The Concrete Star Wind Floater" (CSWF).

This is a concrete semisubmersible floating unit which can support large wind turbines in harsh environment. The CSWF is unique compared to other floating concepts, due to its simplicity in design and construction, and the improved fatigue properties by use of concrete. Very long design life - 100 years or more – can be achieved for the substructure and no maintenance is required. This opens for reuse and adds significant value to the project since wind power will last indefinitely. The concrete foundations can be constructed locally worldwide and can be fully assembled inshore in shallow water. For low cost mass production an efficient fabrication yard on land will be established. Mass production is expected to reduce cost per unit significantly compared to one-off projects.

This presentation will give a general introduction to the floating concept.

 

Gwind – floating VAWT.

Professor Arnfinn Nergaard, University of Stavanger. 

A wind turbine is a highly dynamic system with constantly rotating masses and with strongly varying external loads. When a wind turbine sits on a floater/platform the system becomes even more dynamic with additional inertia and gyroscopic forces and additional loads from Waves and sea currents. The gwind prospect is based on the assumption that VAWTs may prove superior to HAWTs due to the fact that the gyroscopic forces resulting from masses moving in an horizontal plane will tend to maintain verticality of the rotation axis and thereby suppress pitch and roll motion. Additionally, there is a great advantage in seeing the generator and gear systems located inside a dry engine room at a low level compared to the HAWTs. The TTA office Prekubator, and the University of Stavanger is presently running a project with support from the Norwegian Research Council in which a commercial 1 kW VAWT will be installed on to a cylindrical floater and subjected to fjord tests in the spring/summer of 2013.

 

 

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