中文摘要：

分析并推导了双馈风力发电机的数学模型，对常见的并网方式做了分析和比较。基于PSCAD／EMTDC仿真平台搭建了DFIG的软并网方式模型，仿真了电机故障及风速变化时电机及电网侧所产生的冲击电流的大小。验证了软并网方式能够很好地抑制并网运行时冲击电流对大电网的影响。

英文摘要：

The mathematical model of doubly- fed induction generator （DFIG） is analyzed and derived. The common grid integration methods are also analyzed and compared. The soft grid - connection model of DFIG is established in the PSCAD/ EMTDC environment. The impulse current generated at the generator side and the grid side is simulated when there is generator fault and the change of wind velocity, which proves that the proposed mode can well suppress the impact of impulse current on the big grid when DFIG is connected to the big grid.