【作者】 李建林； 梁亮； 许洪华；

【Author】 Li Jianlin;Liang Liang;Xu Honghua;Institute of Electrical Engineering Chinese Academic Sciences;Graduate University of Chinese Academy of Sciences;

【机构】 中国科学院电工研究所； 中国科学院研究生院；

【摘要】 双馈感应式(DFIG)风力发电机组以其变流器容量小、有功和无功功率可独立解耦控制的特点,已成为目前变速恒频(VSCF)风力发电机组的主流机型。正因为DFIG系统的小容量变流器,DFIG系统对电网电压扰动的抵御能力较弱。为了防止电网故障的扩大,目前欧洲电力系统要求风力发电系统具备低电压穿越能力(LVRT)。本文建立了简化的DFIG低电压穿越系统。22kW试验平台的试验结果说明了Crowbar电路可以抑制电机定、转子电路中的暂态电流,系统基本具备了低电压穿越的能力。更多还原

【Abstract】 Due to the double fed induction generator’ s(DFIG) advantage of controlling active and reactive power independently and partly power converter,DFIG is becoming a popular type of wind power generation system.However,the converter is quite sensitive to grid disturbance because of its limited partial capacity compared with the generator rating.Nowadays the grid code in European demands that the wind power generator possesses the ability of low voltage ride through(LVRT),in order to prevent the more severe successive grid faults.A simple LVRT system is built in this article.Experiment results on a 22 kW platform prove that active crowbar circuit is able to reduce the transient current and the system realizes the LVRT ability.更多还原