Cosine Similarity Based Pilot Protection of Teed Transmission Line Connected to Renewable Energy Power Plants

被引：0
|
作者：
Zheng L. [1 ]
Jia K. [1 ]
Bi T. [1 ]
Yang Z. [1 ]
Li Y. [2 ]
Han J. [3 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
[2] North China Branch of State Grid Corporation of China, Beijing
[3] Electric Power Research Institute of Inner Mongolia Power (Group) Co., Ltd., Hohhot
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 18期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Cosine similarity; Current transformer (CT) saturation; Developing faults; Disconnection of current transformer; Pilot protection; Renewable energy power plant; Teed transmission line;
D O I：
10.7500/AEPS20181008011
中图分类号：
学科分类号：
摘要：
The protection of teed line connected to the renewable energy power plants is affected by the limited and distorted short-circuit current of the renewable energy sources and the topology of the teed transmission line. The traditional current phasor differential protection cannot simultaneously meet the reliability of external faults and the sensitivity of internal faults, which has the risk of maloperation and false operation. Therefore, by analyzing the influence of teed transmission line on the main criterion of pilot protection based on cosine similarity, the pilot protection of teed transmission line based on the characteristic criterion of cosine similarity is proposed. The influences of the saturation of current transformer (CT), the developing fault and the secondary side disconnection of CT are considered, and the corresponding auxiliary criterion is researched. Simulation results show that the proposed protection principle can reliably identify faults inside and outside the region in the practical scenarios of teed transmission line, and the principle can cope with the fault scenes of CT saturation and developing faults. The proposed principle has good performance with conventional sampling frequency, and it is suitable for all kinds of renewable energy power plants. Practical data validate the effectiveness of the proposed protection principle. © 2019 Automation of Electric Power Systems Press.
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页码：111 / 119
页数：8
相关论文
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