随机风速下风力发电机组载荷传递特性研究

摘要

Exponential function was used to describe the average wind speed,and the auto-regres-sive method was used to simulate nature random wind speed.Based on the moment of momentum the-orem and simple spring-mass-damping model,the rigid drive model and flexible drive model of a wind turbine transmission system were established to describe the dynamic characteristics of the system. According to the parameters of 5 MW variable speed and variable pitch wind turbine,the influences of the two different drive trains on the dynamic response of rotor blade and generator rotor under the random wind speed were calculated and analyzed and the results of dynamic response were compared. Based on flexible transmission system model,the influences of different main shaft stiffnesses on the dynamic response of transmission system were discussed to obtain the optimum main shaft stiffness, and rainflow counting method was utilized to describe the dynamic response of transmission system under different main shaft stiffnesses.The results provide load data for the research of dynamic char-acteristics of transmission system of wind turbine.%选取指数律函数描述平均风速，运用基于自回归模型的线性滤波法建立的风速模型模拟自然界随机风速。根据动量矩定理和简单的弹簧质量阻尼模型建立风力发电机组传动系统刚性传动模型及柔性传动模型来描述系统动态特性。以5 MW 变速变桨距风力发电机组参数为依据，计算随机风速下两种不同传动模型对风轮叶片以及发电机转子的动态响应的影响，并对结果进行对比分析。基于柔性传动模型，研究不同主轴刚度对传动系统动态响应的影响，得出最佳主轴刚度，并利用雨流计数法描述不同主轴刚度下风力发电机组传动系统的动态响应。研究结果可为风力发电机组传动系统动态特性的研究提供载荷数据。