Single-end current direction transient protection based on morphology for UHVDC transmission line

被引：0
|
作者：
Chen S. [1 ]
Cao R. [1 ]
Bi G. [1 ]
Rong J. [1 ]
Li X. [1 ]
机构：
[1] Department of Electrical Power Engineering, Kunming University of Science and Technology, Kunming
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2016年 / 36卷 / 01期
基金：
中国国家自然科学基金;
关键词：
DC power transmission; Line boundary; Morphological spectrum; Multi- resolution morphological gradient; Transient protection; UHV power transmission;
D O I：
10.16081/j.issn.1006-6047.2016.01.010
中图分类号：
学科分类号：
摘要：
A kind of single-end current direction transient protection based on morphology is proposed for UHVDC transmission line. It judges whether the fault occurs in the out-zone of own side according to the traveling wave direction of fault current;if not, it further judges whether the fault occurs in the in-zone of own side or the out-zone of opposite side according to the decay characteristics of line and line boundary vs. the high frequency signal. Combined with MMG(Multi-resolution Morphological Gradient) transform, the fault transient signal acquired by the rectifier-side protection is used to extract the polarity of current signal at the catastrophe point, based on which, the principle and criterion of current direction element are proposed. The morphological spectrums of the transient signal acquired by the rectifier-side protection are calculated, normalized and converted into frequency domain, which are then used to judge whether the fault occurs in the out-zone of opposite side or the in-zone of own side by comparison. The simulative results show the proposed method can identify the in-zone, out-zone faults of own side and the out-zone fault of opposite side accurately, realizing the protection of whole UHVDC transmission line. © 2016, Electric Power Automation Equipment Press. All right reserved.
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页码：67 / 72
页数：5
相关论文
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