An Opportunistic Maintenance Strategy for Wind Turbines under External Environment Shocks

doi:10.3969/j.issn.1007-7375.2023.03.018

Abstract

Abstract: Considering the characteristics of complex external operating environment and expensive maintenance cost of wind turbines, an opportunistic maintenance strategy for wind turbines under external environment shocks is proposed. A total degradation model is established by using Gamma process to represent the natural degradation process of the systems and using non-homogeneous Poisson process to describe stochastic shocks caused by the external environment. The maintenance probability is determined and the expected maintenance cost is formulated with the maintenance threshold and the sudden failure threshold as dual constraints. Then, the optimal expected maintenance cost is calculated through the optimal opportunistic maintenance threshold interval. An example is given to analyze the relationship between the expected total maintenance cost and the opportunistic maintenance threshold interval with different influencing factors. Results show that the total degradation of a wind turbine subsystem considering external stochastic shocks is much higher than that considering natural degradation, which is more coincident to the actual operation of the wind turbines.

Key words: wind turbines, stochastic degradation, external shocks, opportunistic maintenance

CLC Number:

TP207

CHENG Hui, LIU Qinming, YE Chunming, YANG Xiaoyan. An Opportunistic Maintenance Strategy for Wind Turbines under External Environment Shocks[J]. Industrial Engineering Journal, 2023, 26(3): 159-167.

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