基于暂态电压瞬时频率的柔性直流电网线路故障保护方案

张展; 侯耀杰; 韦延方; 曾志辉; 王晓卫; 刘孟博

doi:10.19783/j.cnki.pspc.260041

欢迎来到能源电力期刊网！

English Version 期刊登录

您当前的位置：

首页 >

文章列表页 >

基于暂态电压瞬时频率的柔性直流电网线路故障保护方案

理论分析 | 更新时间：2026-06-18

- 基于暂态电压瞬时频率的柔性直流电网线路故障保护方案
- Flexible DC grid line fault protection scheme based on instantaneous frequency of transient voltage
- 电力系统保护与控制 2026年54卷第11期
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.19783/j.cnki.pspc.260041
  中图分类号：
- 纸质出版：2026
- 稿件说明：
移动端阅览
张展, 侯耀杰, 韦延方, 等. 基于暂态电压瞬时频率的柔性直流电网线路故障保护方案[J]. 电力系统保护与控制, 2026,54(11).

ZHANG Zhan, HOU Yaojie, WEI Yanfang, et al. Flexible DC grid line fault protection scheme based on instantaneous frequency of transient voltage[J]. Power System Protection and Control, 2026, 54(11).
张展, 侯耀杰, 韦延方, 等. 基于暂态电压瞬时频率的柔性直流电网线路故障保护方案[J]. 电力系统保护与控制, 2026,54(11). DOI： 10.19783/j.cnki.pspc.260041.

ZHANG Zhan, HOU Yaojie, WEI Yanfang, et al. Flexible DC grid line fault protection scheme based on instantaneous frequency of transient voltage[J]. Power System Protection and Control, 2026, 54(11). DOI： 10.19783/j.cnki.pspc.260041.

摘要

针对现有线路边界保护方案易受过渡电阻影响以及缺乏有效整定依据的问题，提出了一种基于暂态电压瞬时频率的柔性直流电网线路故障保护方案。该方案首先采用改进的暂态电压梯度作为启动判据。然后，分析线路两端限流电抗器母线侧与线路侧暂态电压瞬时频率在区内、外故障时的差异，利用奇异值分解 (singular value decomposition

SVD) 处理暂态电压信号，对分解得到的第一层分量应用离散能量分离算法 (discrete energy separation algorithm

DESA) 提取瞬时频率 (instantaneous frequency

IF)，并基于积分差值的极性构建区内外判据。最后，依据第二层分量的奇异性曲线实现故障选极。仿真结果表明，该方案能够有效识别故障区域，具有较强的耐过渡电阻能力，且对噪声环境、限流电抗器尺寸、线路长度、采样频率以及数据同步误差不敏感。

Abstract

To address the issues of existing line boundary protection schemes

which are easily affected by transition resistance and lack effective parameter setting criteria

a flexible DC power grid line fault protection scheme based on the instantaneous frequency of transient voltage is proposed. First

an improved transient voltage gradient is used as the fault activation criterion. Then

the differences in transient voltage instantaneous frequency between the bus-side and the line-side of current-limiting reactors at both ends of the line under internal and external faults are analyzed. Singular value decomposition (SVD) is used to process the transient voltage signal. The instantaneous frequency (IF) is extracted from the first-level component obtained by the decomposition using the discrete energy separation algorithm (DESA)

and a criterion for the internal/external fault is constructed based on the polarity of the integral difference. Finally

fault pole selection is realized according to the strength of the singularity of the second-layer component. Simulation results demonstrate that the proposed scheme can effectively identify fault zones

has strong resistance to transition resistance

and is robust against noise

current-limiting reactor size variations

line length changes

sampling frequency variations

and data synchronization errors.

关键词

Keywords

references

YANG B, LIU B, ZHOU H, et al. A critical survey of technologies of large offshore wind farm integration: summary, advances, and perspectives[J]. Protection and Control of Modern Power Systems, 2022, 7(1): 1-17.

LI B, HE J, TIAN J, et al. DC fault analysis for modular multilevel converter-based system[J]. Journal of Modern Power Systems and Clean Energy, 2017, 5(2): 275-282.

XIANG W, YANG S, ADAM G P, et al. DC fault protection algorithms of MMC-HVDC grids: fault analysis, methodologies, experimental validations, and future trends[J]. IEEE Transactions on Power Electronics, 2021, 36(10): 11245-11264.

LI M, NING J, HE J, et al. Initial traveling wave waveform-based single-ended setting-less protection for VSC-MTDC grids[J]. CSEE Journal of Power and Energy Systems, 2026, 12(2): 915-927.

RADWAN M, AZAD S P. An outlier-based single-ended protection scheme for multi-terminal MMC-HVDC grids based on Hilbert-Huang transform[J]. IEEE Transactions on Power Delivery, 2024, 39(6): 3535-3546.

SALEH K A, HOOSHYAR A, ELSAADANY E F, et al. Protection of high-voltage DC grids using traveling-wave frequency characteristics[J]. IEEE Systems Journal, 2020, 14(3): 4284-4295.

AHMAD M, GONG C, NADEEM M H, et al. A hybrid circuit breaker with fault current limiter circuit in a VSC-HVDC application[J]. Protection and Control of Modern Power Systems, 2022, 7(4): 1-13.

LI H, WANG T, ZHANG F, et al. SVD theory for machine fault detection: a review[J]. IEEE Sensors Journal, 2025, 25(5): 7896-7915.

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

考虑暂态电压安全性与网络拓扑特征的无功电压分区方法

高比例新能源送端系统暂态电压运行风险分析

直流近区系统故障下的暂态电压特性分析及支撑策略研究

基于主动探测式的双端弱馈交流系统模型识别纵联保护

融合功率变化率与裕度反馈的 VSC-MTDC 自适应下垂控制