Energy Efficiency Evaluation And Diagnosis Of Wind Turbine

The electricity-generation course of wind turbine is a state including multiple forms of energy.The running state consists of three energy conversions: wind energy to mechanical energy,mechanical energy transmission and mechanical energy to electricity.The paper provides a new system division based on the energy-flow nodes.Thus the wind turbine is divided into the wind energy capture system,transmission system and generator system.The optimal power output depending on the operation conditions is the target of wind turbine operation.Considering this,the realization level of the wind turbine function from the viewpoint of energy has been analyzed in this paper.In the extraction section of energy efficiency indexes,the hierarchical system of energy efficiency indexes of the wind turbine has been constructed,which contains the unit layer,system layer and equipment layer.Then we accomplished the calculation model of indexes.At last the weights of index are analyzed.In evaluation section,we have completed the operation classification of energy efficiency indexes based on the wind speed and environmental temperature.Then using the least square method to fit the data in good operating condition,we get the indexes in the condition identification.At the same time,verification of the reference value model by the actual operation data has been given.Then the influence of the main operating parameters and energy efficiency indexes on the output is analyzed,and the power potential is calculated according to the reference value.Finally,the D-S evidence reasoning model is used to realize the condition nevaluation of energy efficiency in wind turbine,acquiring comprehensive energy efficiency.In diagnosis section,diagnostic function will be triggered when the energy efficiency evaluation system finds out worse performance.First,the deteriorated parts has been located through Fault Tree Analysis(FTA),then we analyzed the factors of energy efficiency deterioration by three aspects: related parameters type,associated fault type and environmental factors type.Finally,the corresponding optimization measures are put forward to guide the operation adjustment.In the application case analysis section,the feasibility of the research scheme is verified by case study and the actual situation of the wind turbines.