中文摘要：

对国内外风电接入电网的输电网技术规范进行了分析和比较,明确了风电机组的控制要求及对应的控制目标。重点阐述了双馈感应异步发电机（DFIG）和多极直驱式永磁同步发电机（PMSG）2类变速恒频（VSCF）风电机组的拓扑及以最大功率点跟踪（MPPT）为目标的控制方案,其中主要对PMSG的控制方案进行了总结和比较;结合输电网技术规范对风电机组的控制要求,说明了VSCF风电机组在低电压穿越（LVRT）时的控制方案及保护措施,同样以分析PMSG的LVRT控制方案及相应保护措施为主。最后简要介绍了风电机组以提高电能质量、调频能力为目标的研究现状,并对采用分频输电技术的分频风力发电系统进行了探讨。

英文摘要：

This paper analyses and compares domestic and international grid codes,which define the requirements on the wind turbine control and objectives. The focuses are on the topologies of asynchronous doubly-fed induction generator （DFIG） and multi-pole permanent magnet direct-drive synchronous generator （PMSG）,as well as their control schemes aimed at MPPT. A summary and comparison of control schemes is made. The control schemes in the LVRT situation of VSCF wind turbines and the protective measures are illuminated. The paper also stresses the PMSG control scheme and the protective measures. In the end of this paper,a brief description of the present research situation on wind turbines to improve power quality,frequency regulation capability as control objective is given,and fractional frequency wind power system with fractional frequency transmission technology is discussed.