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Vibration Monitoring of Operational Wind Turbine

A. JHINAOUI, L. MEVEL, J. MORLIER

Abstract


The modal analysis of a wind turbine has been generally handled with the assumption that this structure can be accurately modeled as linear time-invariant. Such assumption may be misleading for stability analysis, especially, with the current development of very large wind turbines with complex dynamic behavior (nonlinearity, aeroelastic coupling). Therefore in this paper, the inherent periodically time-varying dynamics of wind turbines (and for rotating systems, in general) is taken into account. Based on the Floquet approach, this paper suggests an on-line vibration monitoring algorithm able to detect any trend of a given wind turbine toward an unstable behavior, before any dysfunction or destruction occurs. This turns out to the detection of any change on some residuals using a bank of cumulative sum tests.

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