Longitudinal protection of ring-type DC distribution networks based on high-order polynomial fitting of circuit breaker currents

HE Dong; XIE Wenkang; LAN Zheng; ZHANG Luming; LAI Wenbin

doi:10.19783/j.cnki.pspc.251384

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Longitudinal protection of ring-type DC distribution networks based on high-order polynomial fitting of circuit breaker currents

更新时间：2026-09-23

- Longitudinal protection of ring-type DC distribution networks based on high-order polynomial fitting of circuit breaker currents
- Power System Protection and Control Vol. 54, Issue 18, (2026)
- 作者机构：
  
  湖南工业大学交通与电气工程学院,湖南,株洲,412007
- 作者简介：
- 基金信息：
- DOI：10.19783/j.cnki.pspc.251384
  CLC：
- Published：2026
- 稿件说明：
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HE Dong, XIE Wenkang, LAN Zheng, et al. Longitudinal protection of ring-type DC distribution networks based on high-order polynomial fitting of circuit breaker currents[J]. Power System Protection and Control, 2026, 54(18).
DOI：

HE Dong, XIE Wenkang, LAN Zheng, et al. Longitudinal protection of ring-type DC distribution networks based on high-order polynomial fitting of circuit breaker currents[J]. Power System Protection and Control, 2026, 54(18). DOI： 10.19783/j.cnki.pspc.251384.

摘要

针对环状柔性直流配电网故障暂态过程复杂、高阻故障识别能力不足等问题，提出一种基于断路器电流高阶多项式拟合的环状柔性直流配电网纵联保护方法。首先，分析了环状柔性直流配电网发生不同故障类型时线路两端断路器稳态和暂态电流的特征。然后，以断路器电流为特征量，利用高阶多项式拟合提取电流变化特征系数，并基于拟合系数建立故障识别与选极判据。最后，在MATLAB/Simulink中搭建环形柔性直流配电网仿真模型，验证所提保护方法的有效性。仿真结果表明，所提方法能满足柔性直流配电网保护速动性和选择性的要求，能快速可靠识别故障线路并进行故障选极，且耐过渡电阻能力强，具有一定的高阻故障识别和抗干扰能力。

Abstract

To address the complex fault transients and limited high-impedance fault identification capability in ring-type flexible DC distribution networks

a longitudinal protection scheme based on high-order polynomial fitting of circuit-breaker currents is proposed. First

the steady-state and transient characteristics of breaker currents under different fault conditions are analyzed. Then

circuit-breaker currents are used as characteristic quantities

and high-order polynomial fitting is applied to extract current variation coefficients. Based on these coefficients

fault identification and fault-pole selection criteria are established. Finally

a ring-type flexible DC distribution network model is built in MATLAB/Simulink to verify the proposed method. Simulation results show that the proposed scheme provides fast and selective protection

enabling reliable fault-line identification and fault-pole selection. In addition

it exhibits strong tolerance to transition resistance

as well as good high-impedance fault detection and anti-interference performance.

关键词

Keywords

references

HE D, WANG Z, WANG W, et al, a fully zero-current turn-off topology for sic solid-state circuit breaker in photovoltaic storage and charging DC microgrids[J]. IEEE Transactions on Transportation Electrification, 2026, 9(2): 2656-2670.

HE D, ZHOU H, LAN Z, et al. Solid-state circuit breaker based on cascaded normally-on SiC JFETs for medium-voltage DC distribution networks[J]. Protection and Control of Modern Power Systems, 2024, 9(2): 32-46.

SHUAI Z, HE D, XIONG Z, et al. Comparative study of short-circuit fault characteristics for VSC-based DC distribution networks with different distributed generators[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2019, 7(1): 528-540.

LI Y, LU Y, YANG J, et al. Transient stability of power synchronization loop based grid forming converter[J]. IEEE Transactions on Energy Conversion, 2023, 38(4): 2843-2859.

ZHANG C, HUANG J, SONG G, et al. Non-unit ultra- high-speed line protection for multi-terminal hybrid LCC/MMC HVDC system and its application research[J]. IEEE Transactions on Power Delivery, 2021, 36(5): 2825-2838.

LIANG Y, JIANG L, LI H, et al. Fault analysis and traveling wave protection based on phase characteristics for hybrid multiterminal HVDC systems[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2022, 10(1): 575-588.

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