中文摘要：

为了提高永磁直驱型风电机组的并网性能，分析永磁直驱型风电机组的基本结构，讨论应用于永磁直驱型风电机组的各种低电压穿越技术，变桨距控制，增加功率开关器件的额定容量，网侧加装辅助变流器，STATCOM运行模式控制，不同位置加装撬棒Crowbar耗能元件，加装超级电容器，储能电池或超级电容器与储能电池组合，连接点出现事故性不对称故障时，改进网侧变流器的控制策略，配合撬棒Crowbar保护电路控制机组的功率平衡，实现不对称故障穿越。文中分析的各种故障穿越技术为后续永磁直驱型风电机组并网能力的提高有一定的理论指导。

英文摘要：

In order to improve the grid-connected power quality of direct-driven wind power system with Permanent Magnet Synchronous Generator （PMSG）, the basic structure units of direct-driven wind power system with PMSG were introduced. Many kinds of low voltage ride through technology employed in direct-driven wind power system with PMSG were discussed, such as variable pitch angle control, increasing the rated capacity of power switch de- vices, equipping with auxiliary inverter on the net side, STATCOM operation mode control, adding crowbar dissipa- tive element in different positions, adding super capacitor, adding storage battery or adding super capacitor and storage battery et al. As accidental asymmetric fault appeared at Common Connection Point （ CCP）, the control strategies of network side converter were improved to realize asymmetric fault ride-through protection circuit control to balance power in wind power system. The kinds of fault ride- , while employing crowbar through technology recom- mended provide some theoretical help for the improvement of the grid-connected power quality of direct-driven wind power system with PMSG.