Investigation of optimum jack-up vessel chartering strategy for offshore wind farm O&amp;M activities

Dalgic, Yalcin; Lazakis, Iraklis; Turan, Osman; Judah, Sol

doi:10.1016/j.oceaneng.2014.12.011

Cited by 34 publications

(11 citation statements)

References 16 publications

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“…There are a number of wind farm O&M models currently under development incorporating turbine reliability and meteorological conditions both for the onshore [3,4,5] and offshore [6,7,8,9] wind sectors. The majority of models estimate O&M cost, while some consider wind turbine/farm availability.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of offshore wind farm operation and maintenance cost and availability

et al. 2016

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Operation and Maintenance (O&M) costs are estimated to account for 14%-30% of total Offshore Wind Farm (OWF) project lifecycle expenditure according to a range of studies. In this respect, identifying factors affecting operational costs and availability are vital for wind farm operators to achieve the most profitable decisions. Many OWFs are built in stages and the important factors may not be consistent for the different phases. To address this issue, three OWF case studies are defined to represent two phases and a complete project. An initial qualitative screening sensitivity analysis was conducted to identify the most important factors of O&M affecting operating cost and availability. The study concluded that the important factors for total O&M cost were access and repair costs along with failure rates for both minor and major repairs. For time-based availability, the important factors identified were those related to the length of time conducting the maintenance tasks, i.e. the operation duration and the working day length. It was found that the two stages had similar results, but these were different compared to the complete project. In this case, the results provide valuable information to OWF operators during the project development and decision making process

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Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of offshore wind farm operation and maintenance cost and availability

et al. 2016

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“…The barge vessel is a flat-bottomed boat which transports heavy components. The availability of lifting vessels and the weather conditions can have a negative impact on the time and cost of the decommissioning operation (Dalgic et al 2015;Halvorsen-Weare et al 2013).…”

Section: Vessel Optionsmentioning

confidence: 99%

A multi-attribute review toward effective planning of end-of-life strategies for offshore wind farms

Jadali

Ιωάννου

Kolios³

2021

Energy Sources, Part B: Economics, Planning, and Policy

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With many offshore wind turbines (OWTs) approaching the end of their estimated service life, there is an increasing demand for developing and evaluating end-of-life strategies that can maximize these assets' value while at the same time satisfying the requirements of the stakeholders involved. This study aims to perform a detailed review and develop a framework that will consider multiple criteria in the decision-making process, presenting and discussing available technologies and strategies, as well as influencing factors such as schedule, cost and environmental impact. Service life extension, repowering and decommissioning are included in this review as the main end-of-life strategies considered by asset owners, and these are translated into four processes that are applicable to offshore wind farms through a generic decision tree. A SWOT analysis is also conducted which aims to compare the different characteristics of the proposed processes. The factors contributing to the uncertainty of the processes as well as lessons learnt from the oil & gas industry are also discussed.

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“…Inspired by current oil prices, marine fuel price can be assumed to be around $ 350 /ton (Ship & Bunker, 2017). Dalgic et al (2015) suggest fuel consumption for a jack-up to range in between 2 tons/day when staying at the port and 10 tons/day when in operation. This gives a price range of $ 30-145 /hour for self-propelled jack-up vessels.…”

Section: R E D E F I N I N G T H E O B J E C T I V E F U N C T I O Nmentioning

confidence: 99%

Strategic Optimization of Offshore Wind Farm Installation

Backe

Haugland

2017

Lecture Notes in Computer Science

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A B S T R A C TThis work describes logistical planning of offshore wind farm installation through mathematical optimization.Two optimization models are developed to analyse cost-effective port and vessel strategies for offshore installation operations. By applying principals of mixed integer linear programming (MILP), the two models seek to minimize total costs through port-and vessel related decisions. The models cover offshore transportation and installation of a given amount of wind turbines. Different vessel strategies, ports, time horizon and weather restrictions are considered in the models. Several deterministic test cases with fixed cost parameters and historic weather data are implemented in AMPL and run with the CPLEX solver. The test cases show promising results in aiding strategic decisions, and the models provide valuable insight into economic impact of such decisions. The results indicate that decision aid could be more reliable if smaller subproblems are considered, potentially in a stochastic framework.

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Investigation of optimum jack-up vessel chartering strategy for offshore wind farm O&M activities

Cited by 34 publications

References 16 publications

Sensitivity analysis of offshore wind farm operation and maintenance cost and availability

Sensitivity analysis of offshore wind farm operation and maintenance cost and availability

A multi-attribute review toward effective planning of end-of-life strategies for offshore wind farms

Strategic Optimization of Offshore Wind Farm Installation

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