Load Analysis And Simulation For Wind Generator

The development of wind turbines has been supported and promoted globally,and scientists are dedicated to studying of high-power wind turbines.The relevant data shows that the weight of a single fan blade with a power of 3 MW can be as high as 10 t,which indicates that the wind turbine is subjected to an increasing load.The load is not only the main source of the noise of the wind turbine,but also causes long-time and large-scale vibration of the fan components.It severely damages the components of the generator and greatly reduces the service life of the fan.Therefore,it is very important to calculate and statistically analyze the wind turbine load.In this paper,the fan aerodynamic load calculation algorithm is proposed through the study of the wind turbine load.Furthermore the algorithm has been modified and improved based on momentum leaf element theory,and the short-term distribution of fan load can be obtained by simulation.This paper is mainly divided into two parts: One part is studied the method of calculating load of wind turbines which includes gravity load,centrifugal force load and aerodynamic load of wind turbine impeller,and the calculation algorithm of aerodynamic load is designed based on momentum leaf theory,as well as the correction and improvement of the algorithm,then use GH Bladed software to verify the correctness of the algorithm;in the other part,the rain flow counting method has been introduced to count the bending moments of the GH Bladed simulation in the direction of the waving direction and the direction of the swaying vibration,at the same time introducing the three-parameter Weibull distribution model to statistically obtain the short-term distribution of the fan blade load.In addition,the calculation method of the long-term distribution of the fan blade load has been given.It provides reference for the aerodynamic design and evaluation of wind turbine generators,and improves the operating efficiency of wind turbines.