Fault protection method for flexible DC distribution networks based on improved FRWT

ZHAN Zhan; XUE Yang; WEI Yanfang; ZENG Zhihui; ZHANG Yunpeng

doi:10.19783/j.cnki.pspc.260025

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Fault protection method for flexible DC distribution networks based on improved FRWT

更新时间：2026-07-27

- Fault protection method for flexible DC distribution networks based on improved FRWT
- Power System Protection and Control Vol. 54, Issue 13, (2026)
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- DOI：10.19783/j.cnki.pspc.260025
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- Published：2026
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ZHAN Zhan, XUE Yang, WEI Yanfang, et al. Fault protection method for flexible DC distribution networks based on improved FRWT[J]. Power System Protection and Control, 2026, 54(13).
DOI：

ZHAN Zhan, XUE Yang, WEI Yanfang, et al. Fault protection method for flexible DC distribution networks based on improved FRWT[J]. Power System Protection and Control, 2026, 54(13). DOI： 10.19783/j.cnki.pspc.260025.

摘要

针对柔性直流配电网中直流侧故障识别困难、传统判据抗干扰能力弱等问题，构建了基于改进分数阶小波变换(fractional wavelet transform

FRWT)的柔性直流配电网故障保护方法。首先，利用FRWT对直流线路暂态电压进行提取，采用自适应细节系数能量阈值作为启动判据。然后，针对不同故障下直流线路两侧限流电抗器的暂态电压差异性特点，提出利用散布熵识别故障位置的保护判据。最后，利用细节系数能量差异性，计算出正、负极整流侧限流电抗器暂态电压的细节系数能量之比，构成故障选极的判据。结果表明，该方法能够准确地区分故障极以及区内、外故障，耐受过渡电阻能力强并对高频分量具有较强的处理水平，抗噪声能力强。在不同工况下表现效果均良好，能够满足柔性直流配电网对保护的要求。

Abstract

To address the challenges of DC-side fault identification in flexible DC distribution networks and the weak anti-interference capability of conventional protection criteria

a fault protection method based on an improved fractional wavelet transform (FRWT) is proposed. First

the transient voltage signals of DC lines are extracted using the FRWT

and the adaptive energy threshold of detail coefficients is adopted as the protection start-up criterion. Then

considering the differences in transient voltages across the current-limiting reactors at both sides of the DC line under different faults

a protection criterion based on dispersion entropy is proposed to identify the fault location. Finally

exploiting the differences in detail-coefficient energy

the ratio of the detail-coefficient energies of the transient voltages across the positive- and negative-pole rectifier-side current-limiting reactors is calculated and used as the fault pole-selection criterion. Simulation results show that the proposed method can accurately distinguish faulty poles as well as internal and external faults. It exhibits strong tolerance to transition resistance

excellent capability in processing high-frequency components

and strong anti-noise ability. The method performs well under various working conditions and meets the protection requirements of flexible DC distribution networks.

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references

YAO Sun, FAN Yanfang, HOU Junjie, et al. A unit protection scheme based on the transient current coordinate mapping interval[J]. Protection and Control of Modern Power Systems, 2025, 10(1): 103-120.

ZHOU Kequan, WANG Tao, CHEN Xiaotian, et al. A fault diagnosis method for power systems based on temporal tissue-like P systems[J]. Protection and Control of Modern Power Systems, 2024, 9(2): 101-114.

MENDLOVIC D, ZALEVSKY Z, MAS D, et al. Fractional wavelet transform[J]. Applied Optics, 1997, 36(20): 4801-4806.

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