Pilot Protection Scheme for Flexible DC Distribution Grids Based on Superimposed Current

DAI Zhihui; LIU Xueyan; LIU Ziqiang; LI Yiran; CHEN Siqi

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Pilot Protection Scheme for Flexible DC Distribution Grids Based on Superimposed Current

更新时间：2025-12-08

- Pilot Protection Scheme for Flexible DC Distribution Grids Based on Superimposed Current
- Vol. 47, Issue 5, Pages: 1684-1695(2021)
- 作者机构：
  
  华北电力大学河北省分布式储能与微网重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 May 2021，
  
  Published：2021
- 稿件说明：
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DAI Zhihui, LIU Xueyan, LIU Ziqiang, et al. Pilot Protection Scheme for Flexible DC Distribution Grids Based on Superimposed Current[J]. 2021, 47(5): 1684-1695.
DOI：

DAI Zhihui, LIU Xueyan, LIU Ziqiang, et al. Pilot Protection Scheme for Flexible DC Distribution Grids Based on Superimposed Current[J]. 2021, 47(5): 1684-1695. DOI：

摘要

柔性直流配电网供电可靠性高、传输容量大

但其继电保护系统还不完善。为此

提出一种基于电流故障分量波形相似度的柔直配电网纵联保护方法。首先

分析了不同故障下两端正负极电流故障分量的极性特征。在此基础上

提出了基于两端正负极电流故障分量波形相似度的双端量保护方法。最后

在PSCAD/EMTDC中进行了仿真分析和验证。结果表明该方法只需电流量即可同时实现故障识别和选相

易于实现;由于利用了两端电流故障分量的相似度

不受线路分布电容电流影响、耐受过渡电阻和噪声干扰能力强、重负荷高阻故障情况下仍能正确识别

且不受换流器闭锁影响。

Abstract

Flexible DC distribution network has high reliability and large transmission capacity

whereas the protection system still needs improvement. Therefore

a protection scheme based on waveform similarity of the superimposed current for flexible DC distribution grids is proposed. First

the polarity characteristics of superimposed currents in positive and negative poles under different faults are analyzed. Then

the double-end quantity protection scheme based on the waveform similarity of superimposed currents of double-end negative-positive poles is proposed. Finally

simulation analysis and verification are implemented on the PSCAD/EMTDC. The results show that the proposed scheme can complete fault identification and fault-pole selection simultaneously based on currents

which is easy to be applied. In addition

due to adoption of the similarity of superimposed currents

the scheme is not affected by the distributed capacitance

is robust to fault resistance

has a strong ability of de-noise

and can correctly identify high-resistance faults under heavy load. It is not subject to the blocking of converters as well.

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Related Institution

State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University)

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University of Chinese Academy of Sciences

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