双馈型风力发电系统低电压穿越技术综述

摘要

As the capacity of doubly-fed induction generator(DFIG) based large wind farms keep increasing,the pen etration of wind power in the power system raises gradually.In order to ensure the safe and reliable operation of the power system,it is important to enhance the low voltage ride-through(LVRT) performance of DFIG.The technical rules of LVRT for connecting wind farm into power grid are discussed.The transient characteristic of DFIG under grid voltage sag fault and the main points of implementing LVRT are analyzed.Then, the existed LVRT technologies for DFIG based wind farm are summarized.In the end,the further LVRT issues are discussed.%随着双馈感应发电机( DFIG)风电场在并网风电容量中比重的增加,为了确保电力系统的可靠运行,提高DFIG风电场的低电压穿越(LV RT)能力显得尤为重要.首先介绍了风电场并网准则对LVRT的要求,接着分析了电网电压骤降故障下DFIG的瞬态特性及其LVRT技术的难点;在系统总结和评价国内外现有DFIG系统的LVRT技术的同时,最后对LVRT技术未来的发展方向进行了展望.