摘要
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。
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.
出处
《广东电力》
2014年第6期21-25,共5页
Guangdong Electric Power
关键词
双馈感应风电机组
三相短路故障
短路电流
仿真
doubly-fed induction generator
three-phase short-circuit fault
short-circuit current
simulation
