EEMD-HHT方法在双馈式感应发电机定子匝间短路故障分析中的应用研究

Application of EEMD-HHT method on stator inter-turn short circuit fault analysis in doubly-fed induction generators

定子绕组匝间短路故障是双馈式感应电机常见故障之一。采用多回路理论构建数学模型,通过MATLAB进行不同故障、不同条件下的仿真。用HHT方法分析故障电流虽然能够得到相应现象,但传统HHT中的EMD分解方法存在一定不足,分解结果不能区分匝间短路故障和一些非故障情况,而引入EEMD分解方法来替换EMD分解,则很好地克服了这一缺点,排除了电压不平衡、变转子转速等其他因素对匝间短路故障诊断过程中的干扰。EEMD-HHT方法可以为定子匝间短路故障检测提供更加可靠的保障。

The stator winding inter-turn short circuit fault is one of the common faults of doubly-fed induction generator（ DFIG）. In this paper,the multi-loop theory is used to construct the mathematical model; different faults under the different condition are simulated by MATLAB. Although the corresponding phenomenon can be achieved by using the HHT method to analyze fault current,there are some deficiencies in the EMD decomposition method of traditional HHT,the results of decomposition cannot differentiate between inter-turn short circuit fault and some non fault conditions. While,after substituting the EEMD decomposition method to the EMD decomposition,the defect of it is overcome. Because the voltage imbalance,variable rotor speed and other factors on the interference in the process of interturn short circuit fault diagnosis can be ruled out after the substitute. The result shows that EEMD-HHT method can provide a more reliable guarantee for stator inter-turn short circuit fault detection.