中文摘要：

基于PSCAD软件建立了直驱永磁同步风电机组（D—PMSG）和双馈感应式风电机组fDFIG）的暂态仿真模型，对比分析了D—PMSG和DFIG风电机组在单相、三相短路故障下的故障特性。仿真结果表明：D—PMSG在电网发生故障时能向电网提供几乎恒定的持续故障电流和一定的无功支持：DFIG在电网发生故障时能提供持续的故障电流，但故障电流呈衰减特性。

英文摘要：

Based on PSCAD/EMTDC, simulation models of D-PMSG and DIFG are built. A comparative analysis of the fault characteristic between D-PMSG and DFIG is made. By use of PSCAD/EMT- DC, the dynamic stability of D-PSMG and DIFG with considering grid-side fault is simulated. Simulation results show that： D-PMSG can provide mostly constant fault current and sent an amount of reactive power support to the grid when power failure ; DFIG can take persistent fault current at the same time, but the current is at the attenuation characteristics.