随着人们对风能重视程度的日益加深，双馈感应发电机(DFIG)的应用越来越广泛。转子绕组匝间短路故障是一种常见故障，对DFIG以及风电系统具有较大危害。文中分析了正常情况以及发生转子绕组匝间短路故障时定子侧电流谐波成分，考虑了绕组结构对谐波成分的影响；建立了DFIG多回路数学模型，计算了发生不同程度转子绕组匝间短路故障时的定、转子电流，分析了发生转子绕组匝间短路故障时电流的变化规律；以傅里叶变换为基础，进一步分析了定子单条支路电流、线电流以及并联支路环流中的谐波成分。这些谐波特性可以用于构造转子绕组匝间短路故障检测与诊断判据。%More and more doubly-fed induction generators (DFIGs) are used in the ever important wind energy.The inter-turn short circuit fault in the rotor will cause great harm to the generator and the wind power system.This paper derives the stator current harmonics both in healthy status and during the rotor inter-turn short circuit fault,and compares the difference between them.At the same time,the work considers the affect of winding structure.On that basis,a mathematical model based on multi-loop theory is established,and used to calculate the current of stator and rotor both in normal and faulty conditions.At last,the harmonic content of the stator current in one branch,line to line and that in the circulation of one phase parallel branch are analysed.These harmonics components can be used for detection and diagnosis of rotor winding inter-turn short circuit fault criterion.
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