电器与能效管理技术 ›› 2025, Vol. 0 ›› Issue (5): 1-8.doi: 10.16628/j.cnki.2095-8188.2025.05.001

• 研究与分析 •    下一篇

低压直流微电网短路故障早期检测方法研究

刘启彤, 缪希仁   

  1. 福州大学 电气工程与自动化学院, 福建 福州 350116
  • 收稿日期:2025-01-06 出版日期:2025-05-30 发布日期:2025-07-24
  • 作者简介:刘启彤(1999—),男,硕士研究生,研究方向为低压交直流系统短路故障早期检测。|缪希仁(1965—),男,教授,博士生导师,研究方向为电器及其系统智能化技术、电气设备在线监测与诊断技术等。
  • 基金资助:
    高校产学合作项目(2023H6006)

Research on Early Detection Methods of Short-Circuit Fault in Low Voltage DC Microgrid

LIU Qitong, MIAO Xiren   

  1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
  • Received:2025-01-06 Online:2025-05-30 Published:2025-07-24

摘要:

为进一步提高低压直流微电网短路故障检测的灵敏性与可靠性,提出一种基于电压、电流多尺度小波变换的短路故障早期检测方法。基于最小二乘前置滤波,充分考虑电压、电流短路故障奇异性,以第四层小波分解细节分量构建短路故障早期检测判据。实验结果表明,所提检测方法对过渡电阻不敏感。过渡电阻较小时能够在0.5 ms内快速检测出短路故障,过渡电阻较大时能够在0.6 ms内可靠检测出短路故障,同时能够有效避免负载频繁投切等干扰工况的影响,具有更好的灵敏性与可靠性。

关键词: 低压直流微电网, 短路故障, 早期检测, 小波变换, 最小二乘拟合

Abstract:

In order to further improve the sensitivity and reliability of short-circuit fault detection in low voltage DC microgrids,a short-circuit fault early detection method based on voltage and current multi-scale wavelet transform is proposed.Based on the least squares front filtering,fully considering the voltage and current short-circuit fault singularity, the fourth layer wavelet decomposition detail components are used to construct the short-circuit fault early detection criterion.The experimental results show that the proposed detection method is insensitive to the transition resistance. The short-circuit faults can be quickly detected within 0.5 ms when the transition resistance is small.The short-circuit faults can be reliably detected within 0.6 ms when the transition resistance is large.At the same time,it can effectively avoid the influence of disturbing conditions such as frequent load switching, and has better sensitivity and reliability.

Key words: low voltage DC microgrid, short-circuit fault, early detection, wavelet transform, least squares fitting

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