基于Clarke矢量模变换的双馈式感应发电机转子匝间短路故障频谱特性的仿真分析

Simulation Analysis on Spectrum Characteristics of Doubly Fed Induction Generator Rotor Inter-turn Short Circuits Based on the Transformation of the Clarke's Vector Modulus

Clarke变换是交流电机分析计算时的一种常用的坐标变换。通过该变换,可以得到三相交流绕组电流、两相交流绕组电流之间的等效关系。在此基础上,提出了一种基于Clarke矢量模变换的双馈式感应发电机转子匝间短路故障检测方法。根据多回路理论,在MATLAB中编写M函数建立起双馈电机的数学模型,对转子绕组匝间短路故障进行了仿真,并对仿真结果的频谱特性进行了分析。仿真结果表明,在低转差的情况下,与传统的定子电流频谱诊断方法相比,该方法能够避免因转差率太小而引起的故障分量被基波分量淹没的情况,有效提高了检测的准确性。

Clarke transformation was a common coordinate transformation in AC motor analysis calculation. Being Clarke transformed, the equivalent relationship between three-phase alternating winding current, two-phase alternating winding current could be obtained. On this basis, proposes a fault detection method of doubly fed induction generator rotor inter-turn short circuits based on the transformation of the Clarke＇s vector modulus. According to the multi-loop theory, a mathematical model of doubly fed induction generator with M-function in the MATLAB was established and rotor inter-turn short circuits fault was simulated, then the spectrum characteristics of the simulation results are analyzed. The simulation results showed that compared with the traditional stator current spectrum analysis method in the case of low slip, the method proposed in this paper could avoid the fault component submerged by the fundamental component caused by the small slip, and improve the detection accuracy effectively.