CAJ | 학술논문

以电网发生三相短路故障时双馈感应风电机组(doubly-fed induction generator,DFIG)的动态物理过程为基础,分析了定子、转子电流中各频率成分之间的依存关系。基于同步旋转 d-q 坐标系下 DFIG 数学模型,从磁链变化的角度,推导出DFIG定子三相短路电流的近似解析计算表达式。提出的计算模型与 PSCAD/EMTDC中搭建的DFIG模型的时域仿真结果进行对比,误差小于3%,验证了计算模型的有效性和分析结果的正确性。
이전망발생삼상단로고장시쌍궤감응풍전궤조(doubly-fed induction generator,DFIG)적동태물리과정위기출,분석료정자、전자전류중각빈솔성분지간적의존관계。기우동보선전 d-q 좌표계하 DFIG 수학모형,종자련변화적각도,추도출DFIG정자삼상단로전류적근사해석계산표체식。제출적계산모형여 PSCAD/EMTDC중탑건적DFIG모형적시역방진결과진행대비,오차소우3%,험증료계산모형적유효성화분석결과적정학성。
On the basis of dynamic physical process of doubly-fed induction generator when three-phase short-circuit fault happening to power grid,this paper analyzes interdependent relationship among each frequency components in stator and ro-tor current.On account of DFIG mathematical model under synchronous rotating d-q reference frame and from the point of linkage change,it deduces approximate analytic calculating expression for DFIG stator three-phase short-circuit current.By comparing time domain simulating result of proposed calculating model with that of DFIG model in PSCAD/EMTDC,it dis-covers that the error is less than 3% which verifies effectiveness of this calculating model and veracity of the analysis result.