电网故障下双馈风电无功特性分析及暂态支撑  

Reactive Power Characteristic Analysis and Transient Support of Doubly-fed Induction Under Power Grid Fault

作　　者：郑婷婷 赵晓敏 郑凌枫 周永智 ZHENG Ting-ting;ZHAO Xiao-min;ZHENG Ling-feng;ZHOU Yong-zhi(State Grid Inner Mongolia Eastern Electric Power Co.,Ltd.Electric Power Research Institute,Hohhot 010020,China;不详)

机构地区：[1]国网内蒙古东部电力有限公司电力科学研究院,内蒙古呼和浩特010020 [2]浙江大学工程师学院,浙江杭州310058

出　　处：《电力电子技术》2024年第1期77-80,共4页Power Electronics

基　　金：国网蒙东公司科技项目(52660422000A)。

摘　　要：在对称电网故障下电网电压跌落程度和风速变化对双馈风电发电机(DFIG)的电磁暂态过程和其无功电流极限的影响规律分析基础上,分别讨论了故障持续期间DFIG定子侧以及网侧变流器的无功支撑特性,并结合并网风电场低电压穿越(LVRT)要求,提出了故障期间利用机组容量输出最大无功电流的DFIG改进控制策略,向电网提供最大暂态无功支撑。最后通过实验验证了所提改进控制策略的可行性。Based on the analysis of the influence law of power grid voltage sags degree under symmetrical grid fault and the change of wind speed on the electromagnetic transient process of doubly-fed induction generator(DFIG)and its reactive current limit,the reactive power support characteristic of DFIG stator side during faults and the grid side converter is deduced.Combining with the low voltage ride through(LVRT)the grid wind power field requirements,an improved control strategy of DFIG is proposed to provide maximum transient reactive power support to the power grid by using the unit capacity to output maximum reactive current during faults.Finally,the feasibility of the proposed improved control strategy is verified by experiments.

关 键 词：双馈风电发电机 电磁暂态过程 故障 无功电流 

分 类 号：TM31[电气工程—电机]