Countermeasures for Mal-operation of Zero-sequence Differential Protection of Converter Transformer Under Inrush Current Condition

被引：0

作者：

Weng H. ^{[1
]}

Guo Y. ^{[1
]}

Li H. ^{[2
]}

Wan Y. ^{[3
]}

Li Z. ^{[1
]}

Huang J. ^{[1
]}

机构：

[1] Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station, China Three Gorges University, Yichang

[2] State Grid Gansu Maintenance Company, Lanzhou

[3] China Yangtze Power Co., Ltd., Yichang

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 23期

基金：

中国国家自然科学基金;

关键词：

Converter transformer; Dynamic time warping (DTW) distance; Magnetizing inrush current; Recovery inrush current; Zero-sequence differential protection;

D O I：

10.7500/AEPS20191216010

中图分类号：

学科分类号：

摘要：

Aiming at the case of mal-operation of zero-sequence differential protection for the converter transformer in the high voltage direct current (HVDC) transmission project, this paper analyzes the phenomenon that the neutral-line zero-sequence current has a large amplitude and decays slowly under the recovery inrush current condition caused by removal of external faults and the inrush current condition caused by the energization of unloaded converter transformers, based on the HVDC simulation model using actual engineering parameters. By identifying differences in similarity characteristics between the waveforms of neutral-line zero-sequence current and the self-produced zero-sequence current under inrush current and internal fault conditions, this paper proposes a new criterion of the zero-sequence differential protection for converter transformers, based on the dynamic time warping (DTW) distance of zero-sequence current. The simulation and recorded cases show that the criterion has the same operation performance as the conventional zero-sequence differential protection in aspects of protecting range and transition resistance endurance ability during various internal faults. The false differential current caused by abnormal transmission of current transformers under the inrush current condition can be correctly identified, and the risk of mal-operation of zero-sequence differential protection can be reduced. © 2020 Automation of Electric Power Systems Press.

引用

页码：143 / 149

页数：6

共 19 条

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