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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
James Nichols Lloyds Register EMEA, United Kingdom
Co-authors:
James Nichols (1) F Peter Davies (1) Krishna Sivalingam (3) Steven Martin (2)
(1) Lloyds Register EMEA, London, United Kingdom (2) Wind Energy Systems Doctoral Training Centre, University of Strathclyde, Glasgow, United Kingdom (3) Lloyd's Register GTC, Singapore, Singapore

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

I have worked in wind turbine loads analysis, performing design and certification load calculations for major manufacturers in the wind turbine industry. I have developed engineering models and incorporated them in a commercial industry leading wind turbine simulation software tool. I have project managed design projects working across several departments and managed the daily workload and career development of a small team of engineers. I have published research in the areas of dynamic modelling of foundations, code-to-code verification and aerodynamic modelling. I am the UK expert in the IEC working group developing a technical specification for floating wind turbines.


Poster

Poster Download poster (9.36 MB)

Abstract

Developing a Framework for Assurance of Floating Wind

Introduction

How do you achieve commercially attractive cost of energy for floating wind without compromising on risk?
Floating offshore wind turbines span a variety of different technologies with a broad range of experience in different sectors. The challenge is to identify which items are truly novel and which combinations of well-proven components lead to increased risk. Floating wind farms may be simply platforms adopted from the offshore industry and applied with a turbine mounted on top; or they may be completely new designs, even accommodating wave or tidal energy converters. This paper outlines the a Technology Qualification process against which novel platforms can be certified along with the technology items which are generic to all floating wind systems which have been tackled in collaboration between Lloyd's Register and academia with a view to providing clearer guidance.


Approach

A key part of a Technology Qualification plan is to assess the goals against which the device will be judged. These can encompass far more than just the structural integrity which a traditional certification covers, such as uncertainty in power performance, ease of maintenance and reliability.

Main body of abstract

An important stage of the Technology Qualification process is to break down the system into components and subcomponents in order to identify the technology which is inherently novel. Novel items require testing and other qualification activities in order to reduce the risk of failure at the time of full-scale deployment.
Even if the system consists of no component which is of itself a novel item, the combination of technologies or the way in which they interact with the environment may mean that risks are introduced. In Lloyd's Register's Technology Qualification approach, this is done by means of adjusting the Technology Maturity Level with an Integration Maturity Level based on the experience with the interface between different technologies. One of the key areas of research is the effect of the motion of floating wind turbines on the rotor aerodynamics and the consequential effect on power capture and structural loading. Lloyd's Register has been performing a series of research projects with a view to developing a next generation fully coupled simulation model floating offshore wind turbines that can capture.
One PhD project has been completed on the CFD modelling of a rotor undergoing surge motion; two further PhD projects are in progress focussing on the validation of CFD modelling using scale model testing and development of enhanced empirical models.
Assessment of the technology is performed for each subcomponent, generating a screening risk matrix covering both the Technology Readiness Level and the Maturity of operating environment for the technology.
The judgement has to be made at what the consequence of failure of each subcomponent will have on the whole system. The risk assessment would normally be in two stages: Hazard Identification; and Risk Identification. The risk assessment can use well understood methods which have been widely used in other methods such as, but not limited to: HAZID, HAXOP, FMEA and FMECA. In carrying out the risk assessment the methods for mitigating the identified risks will be listed against failure modes. These mitigation measures will help form the Technology qualification plan.


Conclusion

As a result of the qualification and assessment, a concrete plan to reduce risks in the project development can be made. The role of the certification body is to provide assurance that the plan can actually reduce these risks, giving enhanced confidence to stakeholders at an early stage. Subsequently, the progress against the plan can be reviewed in order to assess the project and identify risks which have been mitigated and new risks which might have arisen.


Learning objectives
Challenges in design and certification of floating wind systems.
Application of technology qualification methodology to non-standard.
Research results on challenges of coupled modelling of floating wind systems.