双馈风力发电机温度场与环境温度相关性研究

Research on the correlation between ambient temperature and temperature fielddoubly-fed wind turbines

大功率双馈风力发电机异常发热问题是导致风力发电机组失效的主要原因之一,本文基于某大功率双馈发电机单循环冷却结构,分析其内部流场的速度场、压力场分布及冷却介质流通状态,获得了温度场分析所需参数及发电机内部不同位置的冷却状态。研究和计算发电机内部发热元件发热率、导热系数及对流换热系数等发电机温度场参数,结合流场分析结果,对发电机温度场进行计算仿真分析。获得了与工程实际监测数据较为一致的发电机温度场参数,验证了温度场仿真方法的正确性。最后通过对机舱环境温度与电机内部发热元件温度相关性的研究,得出了两者对应的线性函数关系。

The abnormal heating problem of high-power doubly-fed wind turbines is one of the main causes of the failure of wind turbines.Based on the single-cycle cooling structure of a high-power doubly-fed generator,the velocity field,pressure field distribution and cooling medium flow state of its internal flow field are analyzed,and the necessary parameters for analyzingtemperature field and cooling state of different positions in the generator are obtained.The temperature field parameters of generator,such as heating rate,thermal conductivity and convective heat transfer coefficient,are studied and calculated.The temperature field of generator is simulated by combining the results of flow field analysis.The temperature field parametersobtained are consistent with the actual monitoring data,which shows that the simulationmethod is validcorrect.Finally,by studying the correlation between the ambient temperature of engine room and the temperature of heating element inside the motor,the linear function relationshipbetween them corresponding is obtained.