A fully integrated optimization framework for designing a complex
geometry offshore wind turbine spar-type floating support structure

Leimeister, Mareike; Collu, Maurizio; Kolios, Athanasios

doi:10.5194/wes-2020-93

Cited by 5 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Scaled testing for a variety of such requirements can provide guidance not only on performance but also damage; readers are referred to [10,11] for further study.…”

Section: Sls Requirementsmentioning

confidence: 99%

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Bhattacharya

Lombardi

Amani

et al. 2021

JMSE

View full text Add to dashboard Cite

Offshore wind turbines are a complex, dynamically sensitive structure due to their irregular mass and stiffness distribution, and complexity of the loading conditions they need to withstand. There are other challenges in particular locations such as typhoons, hurricanes, earthquakes, sea-bed currents, and tsunami. Because offshore wind turbines have stringent Serviceability Limit State (SLS) requirements and need to be installed in variable and often complex ground conditions, their foundation design is challenging. Foundation design must be robust due to the enormous cost of retrofitting in a challenging environment should any problem occur during the design lifetime. Traditionally, engineers use conventional types of foundation systems, such as shallow gravity-based foundations (GBF), suction caissons, or slender piles or monopiles, based on prior experience with designing such foundations for the oil and gas industry. For offshore wind turbines, however, new types of foundations are being considered for which neither prior experience nor guidelines exist. One of the major challenges is to develop a method to de-risk the life cycle of offshore wind turbines in diverse metocean and geological conditions. The paper, therefore, has the following aims: (a) provide an overview of the complexities and the common SLS performance requirements for offshore wind turbine; (b) discuss the use of physical modelling for verification and validation of innovative design concepts, taking into account all possible angles to de-risk the project; and (c) provide examples of applications in scaled model tests.

show abstract

“…Scaled testing for a variety of such requirements can provide guidance not only on performance but also damage; readers are referred to [10,11] for further study.…”

Section: Sls Requirementsmentioning

confidence: 99%

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Bhattacharya

Lombardi

Amani

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…In the literature many studies have been performed on the design optimization of the different components of floating offshore wind systems. Optimization work is often focused on the substructure and makes use of evolutionary algorithms, particularly Genetic Algorithms (GA) as in [4,5,6]. A complete and detailed review work with regard to the design optimization of support structure for bottom fixed and floating OWT can be found in [7].…”

Section: Introductionmentioning

confidence: 99%

Development of a Genetic Algorithm Code for the Design of Cylindrical Buoyancy Bodies for Floating Offshore Wind Turbine Substructures

Benifla

Adam

2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The Levelized Cost of Energy for floating offshore wind must decrease significantly to be competitive with fixed offshore wind projects or even with onshore wind projects. This study focuses on the design optimization of cylindrical buoyancy bodies for Floating Offshore Wind Turbine substructures. The presented work is based on a previously studied buoyancy body design that allows an efficient manufacturing process and integration into different substructures. In this study, an optimization framework using a particular Genetic Algorithm is developed to parameterize the cylindrical geometry of the buoyancy body and optimize its design in terms of cost, considering loads acting on the structure as well as manufacturing and floater specific dimension restrictions. In this paper, the specific characteristics of this particular buoyancy body are highlighted and the implementation of the optimization process is detailed. Preliminary results for a given study case are presented and discussed before pointing out potential cost reductions and future improvements to be made with regards to the presented optimization work.

show abstract

“…However, floating wind's Levelised Cost of Energy (LCoE) is still much higher than that of conventional offshore wind, and significant cost reductions are necessary to make floating wind a competitive technology. Different works have dealt with the optimal sizing and design of floating substructures for wind turbines, targeting materials or manufacturing costs minimisation [3,4,5,6,7,8]. However, logistics, transportation, assembly, and installation costs constitute about 9% of the overall CapEx for a floating wind farm [9].…”

Section: Introductionmentioning

confidence: 99%

Including installation logistics costs in the optimal sizing of semi-submersibles for floating wind farms

Bessone

Zaaijer

Terzi

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In this research, we explored the potential to reduce the cost of floating wind farms by adopting an integrated approach to optimally size semi-submersible substructures accounting for materials, fabrication and installation-logistics-related costs. A trade-off between manufacturing and installation costs was identified. This trade-off is driven by the growth of shipyard costs when the size of the structure increases, counteracting the reduction of fabrication costs achieved with a larger semi-submersible footprint. For the reference scenario, accounting for this trade-off yields a design that is a few tenths of a percent cheaper than when minimising only fabrication costs. However, the obtained design has a considerably smaller footprint than the fabrication-only case. The sensitivity of this trade-off to different installation strategies affecting the required storage area at the shipyard was assessed. When fabrication costs are dominant, the advantage of accounting for installation costs in the design process is negligible. Instead, larger storage area requirements increase the cost reduction achieved by optimising the semi-submersible while simultaneously accounting for fabrication and installation costs. The coupling effect remained significant for all the cases considered in a further sensitivity analysis of key parameters affecting the cost-optimal design. Furthermore, we identified several different designs that provide enough hydrostatic restoring moment in pitch to counteract the thrust-induced overturning moment within a small cost range from the most cost-effective one. This result suggests that additional criteria than minimising manufacturing and installation costs could drive the final design choice.

show abstract

A fully integrated optimization framework for designing a complex geometry offshore wind turbine spar-type floating support structure

Cited by 5 publications

References 23 publications

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Development of a Genetic Algorithm Code for the Design of Cylindrical Buoyancy Bodies for Floating Offshore Wind Turbine Substructures

Including installation logistics costs in the optimal sizing of semi-submersibles for floating wind farms

Contact Info

Product

Resources

About