Optimisation Of Preventive Opportunistic Maintenance Strategies For Wind Turbines

Wind power has become one of the important renewable energy sources in the past few years and is one of the national strategic emerging industries.With the rapid development of wind power technology,wind turbine manufacturers and O&M providers have further increased the demand for wind turbine maintenance.At the same time,as wind turbine equipment systems gradually develop in the direction of large,complex and multi-functional,the traditional preventive maintenance strategy can no longer meet the diversified maintenance needs of wind turbines.The development and implementation of the initial preventive maintenance plan also determines whether wind turbine manufacturers and O&M providers can improve their competitiveness in the sales market.In this paper,we conduct an in-depth study on the combined optimization of preventive maintenance tasks for wind turbine systems,and establish a corresponding strategy optimization model.Firstly,the decreasing service age factor and the increasing failure rate factor are introduced into the declining process of component maintenance,and the component failure rate function under incomplete maintenance is constructed,and the optimal preventive maintenance interval of the component is solved according to the failure rate function and the minimum reliability value to ensure the normal operation of the system.The optimal number of preventive maintenance intervals for each component can be found by minimising the model.On the basis of the single-component preventive maintenance strategy,the idea of opportunity maintenance is introduced according to the structural relevance and time relevance of the component maintenance tasks,and the opportunity maintenance coefficient is used as the optimisation variable in the target model.In view of the contradictory characteristics of economy and availability,it is difficult to reach the optimal level at the same time.The multi-objective maintenance strategy optimisation model for wind turbines is established by the objective weighting method,taking into account both maintenance cost and availability.The feasibility of the single-and multi-objective optimization models developed in the paper is verified using actual maintenance data for six components of a wind turbine,and the corresponding optimal preventive maintenance planning schemes are developed for different target requirements.The results show that the opportunistic maintenance strategy can effectively reduce the total maintenance cost of the wind turbine during the effective operating cycle and improve the system availability.A maintenance model that considers multiple objectives can effectively meet the needs of different aspects of decision makers.It facilitates the improvement of system internals by WTG manufacturers and helps O&M providers to select the appropriate optimization model based on factors such as maintenance experience and the objectives pursued,and to further develop a preventive maintenance program that meets the maintenance objectives.