Line Pilot Protection of Flexible DC Grid Based on Voltage Traveling-wave Refraction Coefficient

被引：0
|
作者：
Dai Z. [1 ]
Qin H. [1 ]
Qiu H. [1 ]
Wang X. [2 ]
Guo Y. [2 ]
Qiu X. [1 ]
机构：
[1] School of Electric and Electronic Engineering, North China Electric Power University, Hebei Province, Baoding
[2] China Electric Power Research Institute, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2022年 / 46卷 / 12期
基金：
中国国家自然科学基金;
关键词：
flexible DC grid; line pilot protection; Peterson equivalent circuit; voltage traveling wave refraction coefficient;
D O I：
10.13335/j.1000-3673.pst.2022.0569
中图分类号：
学科分类号：
摘要：
Aiming at the issue that it is difficult for the existing line pilot protection of the flexible DC grids to adapt to both the existence and non-existence of the line boundary, a DC line pilot protection based on the voltage traveling wave refraction coefficient is proposed. By analyzing the 1-mode wave impedance of the protected line, a more accurate 1-mode fault-component voltage traveling wave was obtained. Then the Peterson equivalent circuit was used to quantitatively analyze the voltage traveling wave refraction coefficient under the forward faults, while the refraction coefficient under the backward faults was obtained through a qualitative analysis. The fault identification criterion was, accordingly, constructed in light of the difference between the voltage traveling wave refraction coefficients. On this basis, the pick-up and the pole-selection criteria were designed, and together with the fault identification criterion, a complete line pilot protection for the flexible DC grids was formed. Finally, simulation verification was carried out in the PSCAD/EMTDC. The results show that the proposed protection is able to withstand up to 500Ω fault resistance and 20dB noise, realizing the whole-line fast operation. It requires in sampled frequency and data synchronization, having strong engineering applicability. © 2022 Power System Technology Press. All rights reserved.
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收藏
页码：4676 / 4689
页数：13
相关论文
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