Conference programme

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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
Ferdy Hengeveld MECAL Wind / Energy, The Netherlands
Co-authors:
Eyal Taub (1) F Ferdy Hengeveld (1)
(1) Mecal, Enschede, The Netherlands

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Presenter's biography

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

Ferdy Hengeveld has a Bachelor degree in Mechanical Engineering, obtained Cum Laude at the Saxion University of Applied Sciences in Enschede, the Netherlands (1998) with a focus on Energy Technology.

Throughout his career, he has worked in renewable energy, with a strong focus on wind turbine technology. Currently, he is heading MECAL Wind/Energy, supporting OEMs and operators/owners of wind farms by improving their products and assets. Furthermore he is part of the Management Team of MECAL.

Mr. Hengeveld is member of the NEC88 subcommittee that is defining the guidelines for extended operation of wind farms in the Netherlands.


Poster

Poster Download poster (7.11 MB)

Abstract

Cost saving floating foundation and innovative installation system

Introduction

The majority of offshore wind turbines are built on bottom mounted foundations (e.g. mono-pile, jacket, tripod, gravity base). These foundations represent a big part of the CAPEX (Capital Expenditure) of an offshore wind park and require long and expensive installations with offshore cranes. Floating foundations, which are common in the oil&gas offshore industry, are an alternative for bottom mounted foundations especially for deeper water and reduce the cost of offshore wind.


Approach

One floating foundation concept is the TLP (Tension Leg Platform). This foundation type is relatively heavy, but has sufficient floating stability for transport and is easy to install. A similar foundation type is the Mini-TLP. This foundation type has relatively light weight, but does not have sufficient stability to be floated to location and therefore requires an expensive installation with an offshore crane. MECAL designed a light weight Mini-TLP floating foundation and was able to reduce the installation and transportation costs by designing a dedicated system (named “ITS”: Installation and Transportation Structure) to replace the offshore crane.

Main body of abstract

A simulation of a TLP floating foundation with loads from a 6MW offshore wind turbine was conducted by MECAL. The analysis resulted in a 1000ton TLP support structure (for a water depth of ~100m). This weight is much lower than the expected weight for a semisubmersible floating foundation (~3000ton for a 5MW turbine). A unique installation system for the TLP foundation was developed (and patented). This system is comprised of a simple tubular floating structure which provides the stability needed for the transport and installation of the floating wind turbine. The system allows a light weight structure to be used for the support of the wind turbine under normal operations. A life cycle cost analysis of the combined system (TLP and ITS) was conducted showing the advantages of this system.

The main results of the study will be presented with focus on the reduction of LCoE through weight reduction, cost savings, installation time, operation and maintenance and standardization of the offshore foundation.


Conclusion

The study on structural analysis and cost calculations conducted by MECAL have proven the economic feasibility of the TLP structure combined with the ITS system.


Learning objectives
• Feasibility of TLP structure presented.
• Feasibility of transportation of the TLP with the ITS system presented.
• LCoE (Levelized Cost of Energy) reduction of systems presented.