Research And System Development Of Wind Farm Operation And Maintenance Strategy Based On Reliability

The change of global energy pattern is intensifying,under the guidance of the double carbon goal,our country accelerates the energy transition,cause the installed wind power capacity to climb sharply,large-scale wind power unit operation and maintenance management and technical problems become the severe test faced by the wind power plant.How to improve the reliability of wind power unit and reduce operation and maintenance cost has become the main problem to be solved urgently.The optimization of operation and maintenance strategy is the key to solve the main problems of wind farm.In this paper,the operation and maintenance strategy of wind farm is studied,and a set of operation and maintenance decision system of wind farm is designed and developed.The main research work of this paper is as follows:(1)The fault characteristics of components are evaluated and analyzed,and the reliability modeling method of components under small sample fault data is improved.The original data of wind turbine fault records and maintenance records are classified and sorted,and the main processing methods of different wind turbine component faults are summarized,and the vulnerable and consumable components are defined.A classical reliability model was established for large sample fault data by using least square method and maximum likelihood estimation method.A Bayesian reliability model was established for small sample fault data by simulating the prior distribution of parameters based on historical fault data and constructing the posterior distribution of parameters calculated by Monte Carlo Markov chain.Finally,the reliability function of each component is obtained.The effects of different fault sample sizes on the accuracy of component reliability models are compared and analyzed,and the effectiveness of the models is verified by an example.(2)Improve the opportunistic maintenance strategy of wind turbine components and improve the economic benefits of wind farm operation.According to the characteristics of components,the maintenance methods and applicable conditions of components were summarized.Combined with the reliability function of components,a maintenance cost model was constructed,and the reliability threshold of each component in the cost model was optimized.Therefore,the nonlinear relationship between multiple thresholds and maintenance cost was established.Aiming at the lowest maintenance cost,the threshold value of each component is solved based on genetic algorithm.The specific implementation process of the maintenance strategy is proposed,and the optimization effect of the opportunistic maintenance strategy compared with the traditional maintenance strategy in the same operating cycle is analyzed based on the specific example of wind farm operation,and the differences of the maintenance cost and frequency in the two cases of unified threshold and different threshold are compared.The results show that different threshold values can further reduce the cost of opportunistic maintenance strategy.(3)Based on the research conclusion of wind turbine component maintenance,based on the queuing theory method,the multi-component maintenance strategy of multi-turbine is further explored.By referring to the batch service mode,the failure time of multiple units was determined,and the average waiting time of each component for maintenance was calculated.The time parameter was introduced into the power loss formula,and the cost model of component group maintenance was rebuilt.The difference function between group maintenance and individual maintenance is calculated,and the relationship between the function and the number of parts undergoing group maintenance is obtained.Combined with a concrete example,the number of maintenance parts and maintenance cost were calculated,and the sensitivity of important parameters in the cost model was checked to verify the applicability of the strategy.(4)Intensive wind turbine component maintenance strategy,design and develop wind farm operation and maintenance decision system.According to the actual production needs and operation mode of the wind farm,the use requirements of the system are analyzed,the functional modules of different use requirements are divided,the use logic of the system function is designed,the wind farm fault database is established as the analysis basis of the system,and the database,front end,back end and other development technologies are used to achieve the system interface,background calculation and back-end interaction,etc.An operation and maintenance decision system is developed to implement scientific management and safety maintenance for wind farms.