Probabilistic models of structural, mechanical and electrical components are needed in order to assess the reliability of wind turbines (WT) components and systems, as well as optimally planned operation & maintenance (OM) strategies. A general model for modeling and estimating reliability of structural, mechanical or electrical component is described. The main principles of reliability- and risk-based OM planning are presented and it is described how probabilistic models can be included in OM planning models. The reliability level for many electrical and mechanical WT components is quite low, implying that design load cases considering faulty conditions become crucial for WT operation and for WT structural components. For a representative structural failure mode, a corresponding limit state is considered by taking into account faults e.g. due to failure of an electrical component or loss of grid. As an example, a WT converter system component (IGBT) is considered, and formulation of its failure mode by a limit state function allows estimating its unconditional annual failure rates. Finally, a probabilistic model is described by considering the possible fault events in structural components reliability assessment. This probabilistic model can be used for direct assessment of WTs structural components reliability, for OM planning and for calibrating the design rules in standards, such as IEC 61400-1.
Reliability assessment of offshore wind turbines considering faults of electrical/mechanical components
2013
6 Seiten, 15 Quellen
Conference paper
Storage medium
English
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