双馈式风力发电系统低电压穿越技术分析

随着风电穿透功率的急剧增加，风力发电对地区电网稳定性的影响不容忽视，双馈式风电系统低电压穿越技术的研究成为热点问题。介绍了欧洲部分国家低电压穿越的标准，详细分析了双馈感应发电机在电网电压跌落时的暂态特性，总结和分析了双馈式风力发电系统低电压穿越功能的实现方案，并对双馈式风力发电系统低电压穿越技术的发展趋势进行了展望，指出在风电场规划设计阶段，必须慎重选择并网点，同时定制具有相应低电压穿越能力的风机。

Analysis on Low Voltage Ride-Through Techniques for Wind Turbines Using Doubly-Fed Induction Generator

Along with sharp increasing of wind power penetration level, the impact of wind power generation on stability of regional power network cannnot be neglected, and the research on low voltage ride-through (LVRT) of wind power system based on doubly-fed induction generators (DFIG) becomes a hot issue. In this paper, the Grid codes including LVRT of some European countries are presented; the transient characteristics of DFIG during voltage sag are analyzed in detail, the implementation of LVRT function of wind power generation system based on DFIGs is analyzed and summarized, and the development trend of LVRT technology of wind power generation system is previewed. It is pointed out that during the planning and design of wind farm the location where the wind farm is interconnected with power grid should be selected carefully, meanwhile the wind turbine with the ability of LVRT should be made-to-order.