摘要
谐振接地系统运行环境繁杂,单相接地故障发生状态多变,基于单一特征量的传统配电网故障区段定位方法存在各自的定位判别盲区,方法可靠性和适用性难以保障。针对上述问题提出了一种无需整定的基于多维波形差异度聚类分析的配电网故障区段定位方法。依据故障点上下游各检测点零序电流暂态及稳态分量的波形差异性特征,通过离散Fréchet距离算法量化相邻检测点间的暂态及稳态波形差异度,并采用模糊C均值算法(fuzzyC-means,FCM)综合多特征信息以区分正常区段与故障区段,有效消除了单一特征定位盲区,实现故障区段自适应准确定位。PSCAD/EMTDC仿真结果以及10kV真型实验结果表明所提方法不仅保证了在不同故障工况下的定位可靠性和适用性,还具有耐高阻能力强、抗噪性高等优点。
The resonant grounding system has a complex operating environment and variable single-phase grounding fault occurrence status.The distribution network traditional fault section location methods based on a single characteristic quantity have their own location blind zones,and the reliability and applicability of methods are also difficult to be guaranteed.To solve the above problems,a fault section location method for distribution network based on multi-dimensional waveform difference clustering analysis without tuning is proposed.According to the waveform difference characteristics of the zero-sequence current transient and steady-state components at each detection point upstream and downstream of the fault point,the transient and steady-state waveform differences between adjacent detection points are quantified by discrete Fréchet distance algorithm,and fuzzy C-means(FCM)is used to synthesize multi-feature information to divide the normal section and fault section.The location blind zones with single feature are eliminated effectively and the accurate fault section location is realized adaptively.The simulation results of PSCAD/EMTDC and 10kV true experimental test show that the proposed method not only ensures reliability and applicability under different fault condi⁃tions,but also has high resistance resistance and noise resistance.
作者
罗晗菁
曾祥君
喻锟
李志
谢志成
邓军
LUO Hanjing;ZENG Xiangjun;YU Kun;LI Zhi;XIE Zhicheng;DENG Jun(Hunan Province Key Laboratory of Smart Grids Operation and Control,Changsha University of Science and Technology,Changsha 410114,China;Zhejiang Huadian Equipment Testing Institute Corporation,Hangzhou 311217,China;EHV Transmission Company,CSG,Guangzhou 510663,China)
出处
《南方电网技术》
CSCD
北大核心
2024年第6期58-68,97,共12页
Southern Power System Technology
基金
国家自然科学基金资助项目(51737002,52177070)
湖南省自然科学基金项目(2021JJ30729)
湖南省教育厅项目(22A0231)
湖南省研究生科研创新项目(CX20210792)
国网浙江省电力公司科技项目(2021FD05)。
