Comprehensive Criteria of Pilot Protection Based on Structural Similarity and Square Error for Outgoing Line from Renewable Power Plants

被引：0
|
作者：
Zheng L. [1 ]
Jia K. [1 ]
Bi T. [1 ]
Ren L. [2 ]
Yang Z. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
[2] Northwest Branch of State Grid Corporation of China, Xi'an, 710048, Shaanxi Province
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Comprehensive criteria; Pilot protection; Renewablepowerplant; Square error; Structural similarity;
D O I：
10.13335/j.1000-3673.pst.2019.0934
中图分类号：
学科分类号：
摘要：
Wide application of power electronic components in power systems withrenewableenergysources changes the fault characteristics of traditional power systems, resulting in performance degradation of traditional protections, even the risk of maloperation and action refusal. Thisbringschallengesto safe and stable operation of power grid. The waveform differences between both sides of transmission line during internal faults are analyzed, and a comprehensive criterion of pilot protection based on structural similarity and square error is proposed. Wavelet transform is used to extract the information of each frequency band in the currents on both sides in real time, and the internalandexternal faults are identified with the synthetical criterion of structural similarity and square error. The proposed comprehensive criterion is solidified in industrial protection device, and effectiveness of the proposed principle is verified with dynamic hardware-in-loop simulations. The proposed protection solves the problem of performance degradation of differential protection with integration of renewable energy power plants, suitable for all kinds of renewable energy power plants and robust for high resistance faults. Compared with the existing protections based on the transient current characteristics of renewable energy sources, it also shows better performance when the capacity of renewable energy sources is small and reclosed on permanent faults. Validity of the proposed method is also verified by field-recorded data. © 2020, Power System Technology Press. All right reserved.
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页码：1788 / 1795
页数：7
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