Abstract
Due to the high cost of failures of wind turbines, redundancy designs are commonly applied in wind turbines for improving the reliability and availability of systems. For this reason, replacing failed components with other working components of the same type in redundant systems is becoming an attractive option of maintenance strategies towards more resilient systems. To quantitatively evaluate system’s reliability, this paper focuses on the reliability analysis of redundant systems of offshore wind turbines based on swapping existing components. The survival signature-based component swapping method is introduced to describe the new structure-function of the system upon swapping. Furthermore, the reliability model of redundant systems is established using the fault tree and survival signature. Following this, the influences of component swapping on component reliability importance measure (marginal reliability importance and joint reliability importance) without and with considerations of the imprecision of failure rates are explored. Finally, a 5MW offshore wind turbine is presented to show the applicability of the proposed approach for redundant systems, and the results show that the proposed approach can obtain realistic reliability assessment of redundant systems and considering component swapping can significantly improve system reliability.
Highlights
As climate change and energy crises continue to worsen worldwide, there is an increased eagerness to develop cleaner alternatives to fossil fuels
Component swapping developed from survival signature is an effective method to enhance system reliability by swapping between failed components and working components of the same types in a redundant system, which can significantly improve the resilience of systems to failures [19]
The findings show that marginal reliability importance (MRI) of components 5 and 28 of Type 1 are much larger than that of components 29, 45 of Type 2 and components 30 and 47 of Type 3 by comparisons of three figures
Summary
As climate change and energy crises continue to worsen worldwide, there is an increased eagerness to develop cleaner alternatives to fossil fuels. Component swapping developed from survival signature is an effective method to enhance system reliability by swapping between failed components and working components of the same types in a redundant system, which can significantly improve the resilience of systems to failures [19] This kind of maintenance strategy is already used to prevent the shutdown of wind turbines and avoid huge losses in reality.
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