CAJ | 학술논문

　　为准确分析双馈风力发电机多种故障发生时的电磁特性，为故障预测、结构优化和保护提供方法和数据，针对双馈发电机，给出一种用于多工况运行时多种短路故障发生的分析方法。先利用有限元方法建立发电机全区域模型，计算电磁场，然后用得到的数据编程进行傅里叶级数分解得出磁密分布频谱。利用该方法对1.5 MW 发电机建模，对超同步、亚同步及同步正常运行状态及典型的定子部分绕组匝间及单相短路故障的电磁场计算，并进行了分析对比。仿真结果表明，该方法能够根据磁密云图的波形以及频谱图中高次谐波分量等特征量对多种短路故障进行判别，与正常运行状态进行区分。
　　위준학분석쌍궤풍력발전궤다충고장발생시적전자특성，위고장예측、결구우화화보호제공방법화수거，침대쌍궤발전궤，급출일충용우다공황운행시다충단로고장발생적분석방법。선이용유한원방법건립발전궤전구역모형，계산전자장，연후용득도적수거편정진행부리협급수분해득출자밀분포빈보。이용해방법대1.5 MW 발전궤건모，대초동보、아동보급동보정상운행상태급전형적정자부분요조잡간급단상단로고장적전자장계산，병진행료분석대비。방진결과표명，해방법능구근거자밀운도적파형이급빈보도중고차해파분량등특정량대다충단로고장진행판별，여정상운행상태진행구분。
In order to analyze Doubly-fed Induction Generator (DFIG) electromagnetic property accurately when multiple faults happen and provide method and data to failure prediction, structure optimization and protection, this paper proposes an analytical method used for multiple short-circuit fault at multiple working conditions. The generator entire area model is set up by finite element method (FEM), electromagnetic field is calculated, and flux density distribution frequency spectrum is obtained by dealing with programmed data and FFT decomposition. 1.5 MW generator is modeled by this method, and the electromagnetic fields of sub-synchronous, super-synchronous and normal synchronization state and typical stator turn-to-turn and single-phase short-circuit fault are calculated and contrasted. Results of simulation manifest that this method can distinguish multiple short-circuit faults from the normal operation state according to waveforms of flux density nephogram and the characteristic quantity in frequency spectrum such as higher harmonic component.This work is supported by National Natural Science Foundation of China (No. 51267017 and No. 51007077).