Optimisation of operational reliability of large-scale industrial wind turbines

Questa, J. E. Camacho; Montejano, V. Requena; Polo, Fernando Agustín Olivencia; Moreno, L.; Vanhnonacker, T.; Stalaart, B.; Karyotakis, A.; Panagoiliopoulos, O.; Karakassidis, V.; Lang, Zi–Qiang; Cuadra, C. Roldán De La; Calleja, Manuel; Oses, I. E.; Auer, Gunther; Zalacain, I.; Mugica, Jose Errea; Márquez, Fausto Pedro Garcı́a; Pedegral, D.; Lee, D.; Hillmansen, Stuart; Tricoli, Pietro; Hajiabady, Siavash; Fernando, Gerard Franklyn; Papaelias, Mayorkinos

doi:10.1201/b18973-131

Cited by 2 publications

(4 citation statements)

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“…The continued growth in the size and complexity of offshore wind turbines means that more profitable O&M actions will be needed to optimize the upper ranges of robustness for RAMS, in order to fulfill the size increase [1].…”

Section: Introductionmentioning

confidence: 99%

“…Previous research has indicated that O&M constitutes up to 20-30% of the overall cost of OWTs during their lifetimes. However, lowering the O&M cost per unit power will rely on larger OWTs, due to the greater cost per failure of smaller OWTs, their high demand for palliative actions (e.g., corrective maintenance), and their loss of production during Energies 2021, 14, 7662 2 of 14 downtimes [1]. Therefore, increasing turbine size implies decreasing O&M costs.…”

Section: Introductionmentioning

confidence: 99%

“…during downtimes [1]. Therefore, increasing turbine size implies decreasing O&M c Larger OWTs provide a lower number of individual machines that need to be conse and could therefore provide lower O&M costs [2].…”

Section: Introductionmentioning

confidence: 99%

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Reliability and Maintenance Management Analysis on OffShore Wind Turbines (OWTs)

Taboada

Díaz-Casás

Yu³

2021

Energies

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Due to the extreme marine operating environment, the remoteness from the maintenance base, and the expensive specialized accessibility and overhaul equipment needed (e.g., barges, boats, ships, and vessels), offshore O&M costs are greater than those for onshore-based installations. In the operation of wind farms, the main challenges are related to sudden and unexpected failures and downtimes. This paper has three main objectives. The first is to compare and optimize implementation techniques for maintenance strategies. The second is to analyze the cost-benefit of each maintenance strategy model. The third objective is to demonstrate the optimization and effectiveness of maintenance procedures and strategies recreated with stochastic and probabilistic life cycle cost (LCC) models, depending upon the degree of reliability and the maintenance process for offshore wind farms. The cost of operation and maintenance is directly dependent on failure rates, spare parts costs, and the time required by technicians to perform each task in the maintenance program. Calculations for each case study, with either light vessel/transfer boats (Alternative 1) or oilfield support vessels (Alternative 2), focused on the operational costs for transportation. In addition, each case study demonstrated which maintenance conditions and strategies are operational and optimal, and their corresponding cost–risk impacts. Results from this paper suggest that O&M costs are highly correlated with maintenance round frequency (offshore trips) and the operating costs for transportation by light vessel/transfer boat (CTV) and oil-field support vessel (FSV). The paper analyzes cumulative lifecycle costs and finds that for long-term life cycles (25 years), the implement of light vessels (Alternative 1) is more suitable and cost-effective. In contrast, oilfield support vessels (Alternative 2) are more expensive to operate, but they guarantee major capabilities, as well as the advantage of achieving the access levels need to efficiently operate. According to the results obtained by the outcome analysis, it can be concluded that the implementation of light vessels (Alternative 1) shows a lower overall LCC (<million $), which is mainly due to the fact that corrective maintenance and minor repairs are less costly. It should be noted that the cost of major repair operations with light vessels in Alternative 1 is still less than the high costs for minor repairs in Alternative 2 (with FSV).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reliability and Maintenance Management Analysis on OffShore Wind Turbines (OWTs)

Taboada

Díaz-Casás

Yu³

2021

Energies

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“…Although wind turbines are designed to last at least 20 years, the wind energy industry has suffered from premature gearbox failures from its inception. Given that gearboxes are amongst the most expensive sub-systems of utility-scale wind turbines, their premature failure increases the cost of wind energy production considerably [1][2][3][4][5][6][7][8] . Direct-driven design configurations also exist and have been developed to remove the need for a gearbox.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of damage mechanics of industrial wind turbine gearboxes

Junior

Zhou

Roshanmanesh

et al. 2017

insight

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In recent years, global wind power capacity has grown steadily at an annual rate of around 20%. This has led to wind energy becoming the most important renewable energy source on a global scale, with the total installed capacity reaching 430 GW. However, the strong growth of offshore wind power has been somewhat inhibited due to a number of operational challenges that are yet to be addressed in full. The most important of these challenges appears to be the reliability of the wind turbine gearbox (WTG). WTGs are currently unable to survive their anticipated design lifetime of 20-25 years. Most of them hardly reach a useful operational lifetime of more than seven years without serious refurbishment or replacement and, for offshore wind turbines, failures have been reported as early as within one to two years. In this paper, the damage mechanisms influencing WTGs supported by finite element analysis have been considered and presented in the context of condition monitoring diagnosis and prognosis.

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Optimisation of operational reliability of large-scale industrial wind turbines

Cited by 2 publications

References 1 publication

Reliability and Maintenance Management Analysis on OffShore Wind Turbines (OWTs)

Reliability and Maintenance Management Analysis on OffShore Wind Turbines (OWTs)

Evaluation of damage mechanics of industrial wind turbine gearboxes

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