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文章编号： 中图分类号：TM 614；TM773 文献标志码： 学科分类号：470·40 对称电压跌落下风电交互影响， （强电磁工程与新技术国家重点实验室，华中科技大学电气与电子工程学院，武汉市430074Study for Reciprocal Effect Between Overcurrent Protection and Doubly-fed Induction Generator Feeding Current Under the Condition of Symmetrical Voltage Sag TONG Ning, LIN Xiang-ning, LI Zheng-tian, ZHANG Rui (State Key Laboratory of Electromagnetic Engineering, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, China) ABSTRACT: Feeding current of wind generator should not be ignored in many cases with the enhancement of its LVRT capacity and the enlarging scale of wind farm. This scenario may result in challenge to existing protection configuration in wind farm. In this paper, structure of Jiuquan wind farm and protection arrangement are firstly introduced. Then, the time-frequency domain of the feeding current produced by doubly-fed induction generator is analyzed and simulated. As main consideration of overcurrent protection equipped in medium voltage feeder, the AC component within the feeding current is investigated under different lengths of feeder and crowbar resistance as it has significant impacts on the over-current protection. It can be deduced that the modest increase of crowbar resistance and optimization for the wind farm are benefit for against the mal-operation of the over-current protections equipped on the feeders adjacent to the faulty feeder. If above countermeasures are not available and the possibility of mal-operation of over-current protection exists, directional element must be configured for the existing protection. KEY WORDS：doubly-fed induction generator; short-circuit current; time-frequency domain analysis; overcurrent protection 摘要：随着风电机组低电压穿越能力的加强和风电场规模的扩大，提供的短路电流变得不可忽视，的风电场保护配置挑战。了含有结构及保护配置，推导并仿真风机对称电压跌落条件下定子电流的时频域特征，进而保护能够感受到的交流分量深入研究了不同风机侧及网侧参数条件下集群馈出电流与电流保护的交互影响并指出保护可能存在的误动。表明，中压集电线路故障可能引发邻近线路电流保护的误动合理的风电场资源配置可降低其误动风险。加装可在上述参数无法形成有效配合时误动，增强风电场的