A redundancy optimization model applied to offshore wind turbine power converters

Shafiee, Mahmood; Patriksson, Michael; Strömberg, Ann-Brith; Bertling, Lina

doi:10.1109/ptc.2013.6652427

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…Our failure data has been collected from ten-minute Supervisory control and data acquisition (SCADA) database, automated fault logs, O&M reports, and supplemented with data from references [11,[29][30][31]. Figure 5 represents the failure rate of the sixteen sub-assemblies of the onshore/offshore wind turbine system.…”

Section: A Comparative Studymentioning

confidence: 99%

An FMEA-Based Risk Assessment Approach for Wind Turbine Systems: A Comparative Study of Onshore and Offshore

2014

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Failure mode and effects analysis (FMEA) has been extensively used by wind turbine assembly manufacturers for analyzing, evaluating and prioritizing potential/known failure modes. However, several limitations are associated with its practical implementation in wind farms. First, the Risk-Priority-Number (RPN) of a wind turbine system is not informative enough for wind farm managers from the perspective of criticality; second, there are variety of wind turbines with different structures and hence, it is not correct to compare the RPN values of different wind turbines with each other for prioritization purposes; and lastly, some important economical aspects such as power production losses, and the costs of logistics and transportation are not taken into account in the RPN value. In order to overcome these drawbacks, we develop a mathematical tool for risk and failure mode analysis of wind turbine systems (both onshore and offshore) by integrating the aspects of traditional FMEA and some economic considerations. Then, a quantitative comparative study is carried out using the traditional and the proposed FMEA methodologies on two same type of onshore and offshore wind turbine systems. The results show that the both systems face many of the same risks, however there are some main differences worth considering.

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Section: A Comparative Studymentioning

confidence: 99%

An FMEA-Based Risk Assessment Approach for Wind Turbine Systems: A Comparative Study of Onshore and Offshore

2014

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“…5 This paper proposes an approach of joint redundancy and maintenance strategy optimization for offshore power converters which extends the model presented in our study in Ref. 6. We in particular aim to simultaneously determine the optimal allocation of redundant converters and the optimal threshold number of converters that are allowed to fail before sending a maintenance crew to the offshore platform.…”

Section: Introductionmentioning

confidence: 86%

Optimal Redundancy and Maintenance Strategy Decisions for Offshore Wind Power Converters

Shafiee

Patriksson

Strömberg

et al. 2015

Int. J. Rel. Qual. Saf. Eng.

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Analysis of field failure data collected from various wind farm databases indicates that the power converters are among the most critical components in offshore wind turbines, since they suffer from a high failure rate. One efficient approach to enhance the reliability and availability of the wind power systems is through using a redundant converter design, in which a set of power converters is placed together in parallel. The main advantage of a multiple parallel converter system is that the failure of one converter will not necessarily lead to the failure of the entire system. It may however increase the wind turbine's acquisition cost, volume, and weight. In this paper, we propose an approach of joint redundancy and maintenance strategy optimization for offshore wind power converters, aiming to simultaneously determine the "optimal allocation of redundant converters" and the "optimal threshold number of converters that are allowed to fail before sending a maintenance crew to the offshore platform". The optimal solution under various systemlevel constraints (such as reliability, weight, and the available space in nacelle) is derived and the conditions required to make using a redundant system beneficial are discussed. The proposed design is applied to an offshore wind turbine system and its performance is evaluated using a Monte-Carlo simulation technique. Finally, the results are compared with the conventional power converter system and a sensitivity analysis is conducted in order to make the proposed approach applicable for the next generation of wind turbines.

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“…A new approach that can be taken by industry is rethinking the design of the turbines, and the way in which the wind turbine units could be simplified in order to reduce maintenance costs and increase the reliability of the system is described in [41,111]. Simplifying multiple power converters in each turbine would be [44] a possible benefit, including cost savings, loss and maintenance reduction and increased system reliability, however, Shafiee et al [112] proposed an effective way to improve the reliability and availability of the converter system by adding at least one independent redundant converter in offshore wind farms, which ensures that the system will work in case of a converter failure. It can save a great deal of maintenance of offshore turbines with optimal [113] generator designs, and the fixed-pitch fixed-speed induction generator-based wind turbine presents low [114] maintenance costs in [115], and the results confirmed that the controllability of the wind farm is increased using a rotor impedance control technique.…”

Section: Maintenance and Life Cycle Cost (M_cost)mentioning

confidence: 99%

New Tendencies in Wind Energy Operation and Maintenance

et al. 2021

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Both the reduction in operating and maintenance (O&M) costs and improved reliability have become top priorities in wind turbine maintenance strategies. O&M costs typically account for 20% to 25% of the total levelized cost of electricity (LCOE) of current wind power systems. This paper provides a general review of the state of the art of research conducted on wind farm maintenance in recent years. It shows the new methods and techniques, focusing on trends and future challenges. In addition to this, this work includes a review of the following items: (i) operation and maintenance, (ii) failure rate, (iii) reliability, (iv) condition monitoring, (v) maintenance strategies, (vi) maintenance and life cycle and (vii) maintenance optimization As for offshore wind turbines, it is crucial to limit the maximum faults, since the maintenance of these wind farms is more complex both technically and logistically. Research into wind farm maintenance increased by 87% between 2007 and 2019, with more than 38,000 papers (Scopus) including “wind energy” as the main topic and some keywords related to O&M costs. The LCOE in onshore wind projects has decreased by 45%, while in offshore projects it has decreased by 28%. The O&M costs of onshore wind projects fell 52%, while in the case of offshore projects, they have declined 45%. Thus, the results obtained in this paper suggest that there is a change in research on wind farm operation and maintenance, as in recent years, scientific interest in failure has been increasing, while interest in the various techniques of wind farm maintenance and operation has been decreasing.

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A redundancy optimization model applied to offshore wind turbine power converters

Cited by 6 publications

References 21 publications

An FMEA-Based Risk Assessment Approach for Wind Turbine Systems: A Comparative Study of Onshore and Offshore

An FMEA-Based Risk Assessment Approach for Wind Turbine Systems: A Comparative Study of Onshore and Offshore

Optimal Redundancy and Maintenance Strategy Decisions for Offshore Wind Power Converters

New Tendencies in Wind Energy Operation and Maintenance

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