Abstract
Diagnosis of complex engineered systems such as wind turbines poses a challenging task involving fault detection, localization, and repair activities. Wind turbines are equipped with a large number of sensors tracking their operation and condition. Data is continuously transmitted to a central monitoring system, where it can be used to automatically detect deviations between the observed and expected behavior. Based on the revealed anomalies, appropriate actions may be taken to restore an operational state. Whereas fault detection has been automated to some extent, localization is still performed mostly manually based on the experience of the service staff. This is inefficient due to limitations in available human resources, lack of long-term learning, and a high potential for false positives. In this chapter, we introduce an application that supports the process of efficient fault identification. Besides exploring the foundations, we present the overall diagnosis process as well as the software’s user interface, which has been developed in consideration of the typical work processes and environments of the maintenance staff. Further, we discuss the current stage of the application’s integration into the wind turbine diagnosis process.
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Notes
- 1.
Uptime Engineering GmbH provides consulting services as well as software tools in the field of technical reliability.
- 2.
A logical theory is acyclic in cases when it can be represented by a directed acyclic graph where each proposition is represented as a node and an edge is drawn from a proposition to another in case the former directly implies the latter.
- 3.
Here, efficiency is subjective to the application domain, e.g., in the context of wind turbines deriving explanations in minutes is sufficient, while for automotive on-board diagnosis this computation time is unacceptable.
- 4.
In the case of wind turbines, there is generally a strong single fault assumption. Thus, each depicted root cause in this example only consists of a single failure, e.g., IGBT module: Diode/IGBT wire bonding—TMF. Yet, the diagnosis engine is of course capable of determining multiple fault diagnoses.
- 5.
A notification for the person responsible for the entire installation is automatically generated containing the request. Only after the permission has been granted, may the technicians perform the maintenance work.
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Acknowledgements
The work presented in this paper has been supported by the FFG project Applied Model Based Reasoning (AMOR) under grant 842407 and the SFG project EXPERT. We would further like to express our gratitude to VERBUND Hydro Power GmbH.
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Koitz, R., Wotawa, F., Lüftenegger, J., Gray, C.S., Langmayr, F. (2018). Wind Turbine Fault Localization: A Practical Application of Model-Based Diagnosis. In: Sayed-Mouchaweh, M. (eds) Diagnosability, Security and Safety of Hybrid Dynamic and Cyber-Physical Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-74962-4_2
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