
1. 国网四川省公司电力科学研究院
2. 电子科技大学
Published:2024
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张华, 苏学能, 任杰, et al. 基于时频域瞬时特征的配电网弧光接地故障检测[J]. 2024, (5): 53-60.
张华, 苏学能, 任杰, et al. 基于时频域瞬时特征的配电网弧光接地故障检测[J]. 2024, (5): 53-60. DOI: 10.16527/j.issn.1003-6954.20240508.
配电网弧光接地故障对电力系统安全和人身安全带来很大的威胁,快速准确的弧光检测是实现故障隔离与处置、预防电气安全风险的重要技术手段之一。为实现在不同电压等级和系统配置下均具有高水平检测速度和准确度的弧光检测,提出了一种基于时频域特征的弧光接地故障检测方法。首先,通过奇异值分解与变分模态分解将零序电流分解为不同频带的单分量子信号,得到的子信号有不同的频带与中心频率,且避免了模态混叠带来的误差,有利于对不同谐波分量进行细化分析;然后,利用希尔伯特变化获得子信号的瞬时幅值、相位与频率,并将瞬时特征作为检测的主要依据,为保证在线计算时对时序信号分类的准确性,设计了基于长短期记忆(LSTM)网络的故障分类器以区分弧光接地与其他情况;最后,通过不同系统配置的实际配电网弧光接地的故障数据验证了该方法的性能。
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