双馈异步发电机定转子绕组过热故障监测方法

Monitoring Method for Overheat Fault of Stator and Rotor Windings of Doubly-Fed Induction Generator

双馈异步发电机(DFIG)在长期运行中很容易发生定转子绕组过热故障。以绕组温度为研究对象,在分析绕组过热故障成因的基础上,分别从电机热性能和参数辨识两方面进行检测。使用参数辨识法时,首先利用电机电磁数学模型辨识定转子绕组电阻,再根据电阻与温度之间的关系计算定转子温度,从而判断绕组是否过热。最后基于MATLAB软件仿真验证了定转子绕组参数辨识法的正确性,为DFIG诊断绕组过热故障提供理论支撑。

The doubly-fed induction generator(DFIG)was prone to overheat faults of stator and rotor windings in long term operation.The winding temperature was taken as the object of study.Based on the analysis of the causes of winding overheat fault,tests were carried out from two aspects of motor thermal performance and parameter identification.Using parameter identification method,resistance was identified for the stator and rotor windings based on the electromagnetic mathematical model of motor,and then the temperature was calculated according to the relationship between resistance and temperature to judge whether the windings were overheated.Finally,the correctness of the identification method of stator and rotor winding parameters was verified by MATLAB simulation,which provided theoretical support for the diagnosis of DFIG overheat fault.