Study On The Effect Of Blade Icing On The Operation Reliability Of Xinjiang Wind Power Equipment

In recent years,due to the increasingly prominent environmental problems,all walks of life are seeking green development.In the power industry,wind power is receiving more and more attention from all over the world,and the scale of wind power is also expanding rapidly.Most of China’s wind power equipment is installed in high-altitude,cold mountainous areas or sea areas,and the blades face ice-covered problems.On the one hand,ice coating leads to an increase in operation and maintenance costs,and on the other hand,accelerates blade aging.How to effectively prevent or avoid blade icing by predicting is an urgent problem to be solved in recent years.The blade icing of wind power equipment is the result of multiple factors.In this paper,the 1.5 MW wind power equipment in Xinjiang is taken as the research object,and the fuzzy analytic hierarchy process is introduced.The evaluation model of wind immersion factors in wind power equipment is proposed.Based on the field investigation and experiment,a grey correlation method is proposed to predict the ice coating factors of wind power equipment.The main conclusions of the paper are as follows:The theoretical analysis clarifies that the factors affecting blade ice coating of wind power equipment are divided into internal factors and external factors,and each of the internal and external factors contains six small factors.The fuzzy analytic hierarchy process is used to establish a system for evaluating these factors.According to the expert scoring method(specifically,the 1~9 scale method),each factor is given a weight,and the decision is made according to the weight result.The results show that:(1)the influence of humidity and liquid water content in external factors is larger than other factors;(2)the influence of surface temperature on internal factors is more obvious than other factors;(3)temperature,wind speed,humidity and water droplet diameter on wind power equipment the influence of leaf icing on the proportion accounted for 73.8%.In the test phase,the four factors of temperature,wind speed,humidity and water droplet diameter were studied by the control variable method.The test results show that:(1)when there is no wind speed,water droplets are easy to form ice cones at the tip of the leaf.When there is wind speed,the water droplets form a crystalline ice layer on the surface of the blade,and the wind speed is larger,the larger the area of ice coating is,the smaller the ice crystal particles are,the thinner the ice coating thickness is;(2)the larger the water droplet diameter,the formation on the blade surface The larger the ice crystal particles,the coarser the ice surface;(3)the effect of temperature on it is that the ice surface formed on the surface of the blade is relatively smooth at-10 ~ 0 °C.When the temperature is between-20 ° and-10 ° C,the surface of the blade will form an uneven ice surface.The lower the temperature,the thinner the thickness of the ice coating;(4)the effect of humidity on the humidity is greater,the more obvious the ice coating,the thicker the ice thickness.As the humidity increases with the blade,the amount of ice coating increases.(5)When the wind power equipment is in the shutdown state,the ice coating is the most serious.Almost all the blades will be covered with ice,and the icicles will form easily at the tip of the blade;(6)Under any working conditions,The ice-covered position is mainly concentrated on the leaf front,and the most severe position is the leaf front three quarters(leaf length 1.6 m).In the actual operating environment,since the collected data is collected in stages,the data is not continuous or incomplete.Therefore,the gray correlation method is used to construct the prediction model.Compared with the prediction models established by traditional mathematical statistics,the research shows that the prediction models established by the two are highly consistent.According to the gray correlation method,there is a strong correlation between ice coating of wind power equipment and temperature,wind speed,humidity and water droplet diameter.Among them,the effect of humidity is significantly greater than the other three factors.Finally,the established grey correlation prediction model is embedded in the SCADA monitoring system.By monitoring the changes of the surrounding environment of the wind power equipment,the wind cover of the wind power equipment is observed in real time in order to make a decision.The research results of this paper have important reference value for further analysis of the ice coating characteristics of wind power equipment,improve the operation and maintenance efficiency of wind farms,and provide an important theoretical basis for exploring reasonable methods of anti-icing and deicing.