摘要
分析了双馈风力发电机定子绕组匝间短路的故障机理,建立了定子绕组匝间短路数学模型,利用MATLAB/Simulink仿真得到了发电机定子绕组匝间短路故障发生时的定子三相电流和匝间环流。研究结果表明:从定子三相电流波形中难以分辨轻微匝间短路;而通过分析不同故障情况下定子电流Park矢量椭圆长半轴和短半轴的长度发现,Park矢量椭圆离心率能够灵敏反映故障并预估故障程度,因此,认为Park矢量椭圆离心率可以作为定子绕组匝间短路故障诊断的特征参量。
By analyzing the fault mechanism of stator inter-turn short circuit in doubly-fed induction generator（DFIG）,the mathematical model for the stator inter-turn short circuit fault was established.Numerical simulation was carried out on the platform of MATLAB/Simulink,the three phase currents and inter-turn circulation during the stator inter-turn short circuit fault are acquired.The results show that,it is difficult to distinguish a slight inter-turn short circuit from the stator currents.The eccentricity of Park＇s vector trajectory is analyzed under different fault conditions.It shows that the eccentricity can be a fault feature because it is sensitive to faults.Therefore,the eccentricity is regarded as a characteristic parameter and can be a basis of fault diagnosis.
出处
《热力发电》
CAS
北大核心
2016年第8期63-67,共5页
Thermal Power Generation
基金
中国华能集团公司总部科技项目(HNKJ13-H20-05)
